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2026.08.15

Electrical Design Outsourcing 2026 | Spec Detail Beats Skill

Electrical Design Outsourcing 2026 | Spec Detail Beats Skill

Electrical Design Outsourcing 2026 | Spec Detail Beats Skill

You are installing a new machine, or modifying an existing line. When that happens, the two work packages that come to mind for most buyers are “build the control panel” and “write the PLC program.” Those are the two line items on the quotation, and they are the two with the biggest numbers attached. Yet when a project slips its delivery date, generates change orders, and ends with the production floor saying “this is not what we agreed,” tracing the problem backwards almost always lands you one step earlier in the chain. It lands on electrical design, the work of deciding how the circuit is actually built. Sequence design, wiring diagrams, and the allocation of input and output points.

This process has one defining characteristic. It is very hard to see as a thing you are buying. Ask a control panel builder for “the whole package” and somebody inside that company draws the diagrams. Hand the job to a machine builder and the circuit gets designed as part of the machine. From the buyer’s side, the process itself is invisible. And because it stays invisible, you end up with drawings that do not match how your plant actually runs, discovered only after the panel has already been wired. Or you hand PLC program development to a different company and the work stops on day one because nobody can say which sensor is wired to which input. When this happens, the verdict on the shop floor is usually “that electrical design firm just is not very good.”

But lay out the documents the buyer supplied, and in most cases there was not enough there to design from. Which devices need to move, and how? On a fault, what stops immediately and what stays energized? Of the three revisions of the existing drawing set, which one is the current one? Ask anyone to draw a circuit without those answers and even the most capable designer has to fill the gaps with assumptions. When an assumption turns out to be wrong, that is rework. In other words, what separates a successful electrical design outsourcing project from a failed one is not the vendor’s technical skill. It is the granularity of the information the buyer hands over.

And this pressure is getting worse year by year. Engineers capable of doing electrical design are in short supply worldwide, and in Thailand that global shortage is compounded by a talent war with Chinese-owned companies. The assumption that you can keep securing a vendor who has spare capacity to redraw things for you, on the same commercial terms as before, is quietly falling apart. This article reframes electrical design as an independent thing you procure. It covers what to put on paper before you order, which type of vendor to choose, and where cost and lead time are actually decided, all grounded in the realities of running a factory in Thailand and the wider ASEAN region.

Electrical Design, Control Panel Manufacturing and PLC Programming Are Separate Processes

Start by separating the three processes that get conflated most often. Failing to separate them is exactly what produces vague purchase specifications.

Electrical design is the process of deciding what circuit will run a machine or a line, and expressing that decision as drawings and schedules. How power is distributed from the main supply to each device. How the emergency stop and the safety circuit are structured. Which PLC input or output each sensor and actuator is assigned to. What the terminal numbering scheme is and what conductor sizes are used. The deliverables are a stack of documents: elementary wiring diagrams, sequence diagrams, wiring lists, input and output schedules, and bills of material. Nothing physical is produced. But that stack of paper is the input to both of the processes that follow.

Control panel manufacturing is the process of building the actual enclosure from those drawings. Sheet metal enclosure, breakers, relays, power supplies, PLC base, wired per the drawings, power-on tested, shipped. What matters here is build quality, procurement capability, and delivery. Where to build it, and whether to build in Japan or hand it to a local Thai manufacturer, is a question that belongs to this process, not to design. For the panel purchase itself, our guide to control panel design and manufacturing in Thailand covers the comparison between building in Japan and building locally in detail. This article deals with the layer above that, namely how you design what goes inside the box.

PLC program development is the process of writing the logic of the machine’s behaviour using the input and output points that have already been allocated. Process sequencing, interlocks, fault handling, HMI screen design, communication with upper-level systems. What matters here is software design capability and the ability to debug. For outsourcing that process, we have collected the decision criteria in our article on outsourcing PLC program development. Electrical design and software design sit next to each other, but they require different skills and produce different deliverables. The same company may well handle both, and often does. Even then, treat them as separate processes and write separate specifications for each.

Electrical Design Outsourcing 2026 | Spec Detail Beats Skill - figure 1

Viewed as a set of decisions the buyer has to make, the relationship between the three processes looks like this.

ProcessMain deliverablesWhat the buyer must decide firstImpact if it slips
Electrical designElementary diagrams, wiring lists, I/O schedules, bills of materialRequired behaviour, specified devices, safety policy, which existing drawing is currentBoth downstream processes stop at the same time
Control panel manufacturingPhysical panel, test reportsInstallation environment, dimensional constraints, delivery dateSite installation schedule shifts
PLC program developmentProgram, HMI screens, commissioning recordsProcess sequence, fault handling, data to be recordedStart-up gets pushed back

The column to focus on is the one on the right. When electrical design slips, both downstream processes stop simultaneously. Put the other way round, electrical design is the single process where locking things down early delivers the most value. And yet on most projects it is treated as something “included in the panel quotation” and is never subject to its own delivery tracking. That is the first fork in the road.

The Structural Reasons Electrical Design Engineers Are Running Short Worldwide

The natural next thought is “fine, let us go find a good electrical design firm.” Before that, it is worth understanding that the pool you are choosing from is itself shrinking. The figures below come from surveys in the United States, Germany and China, and every one of them is quoted or presented in an article published by quilter.ai. In other words, these are second-hand citations. None of them describe the situation in Thailand directly. But as a structural trend in engineering labour supply, it is reasonable to expect the same pressure to reach Japanese-owned plants in Thailand with a delay.

The quilter.ai article on the hardware engineer shortage quotes IEEE VLSI data from 2022 showing that in the United States, enrolment in electrical engineering has fallen by roughly 90% relative to computer science since the 1980s. That is better read not as students abandoning electrical engineering outright, but as a relative decline caused by a sustained flow of talent towards the software side. The same article cites a 2022 Electronic Design survey in which 77% of the companies surveyed reported difficulty hiring qualified engineers.

The age profile is the more serious part. K2 Staffing data from 2025, quoted in the same article, indicates that for every three senior engineers who retire, only one to two new graduate engineers come in. The people leaving are the ones who know the quirks of a given circuit and the unglamorous field workarounds that make it run. The drawings survive them. The reasoning behind why the circuit was built that way does not. In Germany, VDE forecasts that more than 100,000 job openings in electrical and electronic engineering will go unfilled over the next decade. The fact that European manufacturers cannot staff their electrical design work reaches Asia too, in the form of changes to the design tools and the outsourcing models that get used here.

The geographic skew on the supply side is also hard to ignore. The same article presents a comparison in which China produces 1.5 million engineering graduates a year while the United States produces 140,000. The concentration of engineering talent in China is not somebody else’s problem for Thai manufacturing. As the next section explains, some of that talent ends up working for Chinese-owned manufacturers that have set up in Thailand.

Stack those three points together and the working assumption a buyer should hold changes. The model of “find a good design firm and let them interpret our loosely worded requirements” was built for an era when there were enough experienced engineers around to do the interpreting. As that spare capacity thins out, the way to protect a project is to reduce how much interpretation it requires. That means raising the granularity of what you hand over, and it is a genuine procurement strategy rather than a nicety.

Why Thai Plants Are Finding It Harder to Secure Electrical Designers

Turn to Thailand and the picture gets more concrete. According to the recruitment guide published by careerlink.asia, Chinese EV manufacturers expanding into Thailand, specifically companies such as BYD, Great Wall Motor and Changan Automobile, are increasingly offering salaries 20 to 30% higher than Japanese-owned companies, and competition for engineering and management talent in manufacturing has intensified between them and Japanese firms. The people being fought over are precisely the population that has historically handled equipment electrical design and maintenance.

Japanese-owned companies cannot match those offers quickly because of internal salary band constraints, and the result is a thinner in-house electrical design bench. A thinner bench means a higher share of the work goes outside. But the outsourcing partners recruit from the same labour market, so the firms with the best designers are precisely the ones with no free capacity. If you are hearing “we can quote it, but we cannot start for a while” more often than you used to, that is the market talking, not vendor laziness.

Bringing a designer over from Japan is an option, but it carries regulatory conditions. According to the explanation published by thaibiz.jp, under the visa and work permit screening criteria applied by the Thai BOI, the Board of Investment, an engineer’s salary is in principle expected to be at least THB 75,000 per month, relaxed to at least THB 50,000 per month where the person holds a bachelor’s degree or higher in an engineering field. Keeping a Japanese engineer in place on an ongoing basis means budgeting personnel cost at that level. And if you instead rely on locally hired Thai engineers, the pool that meets the degree requirement is sitting right in the middle of the talent war described above.

Two practical conclusions follow. First, since it is getting hard to assume you will always have practising electrical designers on staff, what you need to retain internally is not the ability to draw the diagram but the ability to judge whether the diagram you were given fits the way your plant runs. Second, to make that judgement possible, the information you supply at order time has to be maintained as a company asset. People will turn over. If the granularity of what you hand over stays constant, the quality of what comes back stays stable too.

The Information to Put on Paper Before You Order

So concretely, what should be written down before it goes out? This is the core of the article. The construction principle is simple: identify every item a design firm would otherwise have to fill in by assumption, and close those gaps in advance.

Electrical Design Outsourcing 2026 | Spec Detail Beats Skill - figure 2

What you hand over falls into five bundles. Taking them in order:

The first is the definition of behaviour. Not what the machine does, but in what order, subject to what conditions, and where it waits. The conditions for switching between automatic and manual operation. How homing is meant to work. When the emergency stop is pressed, which devices must drop out immediately and which must hold their state. Vagueness here changes the architecture of the safety circuit itself, not just a detail within it.

The second is device confirmation. Model numbers and quantities for the motors, sensors, valves and servo amplifiers you intend to use, and their power supply specifications. If you already have an internal standard, state it explicitly. Writing only “or equivalent” invites substitution with a different manufacturer’s part that happens to be easier to procure, and that substitution can change the control method on the PLC side after the fact.

The third is your thinking on inputs and outputs. Allocating the points is the design firm’s job, but only the buyer knows how many spare points you want held back, which devices you are contemplating adding in future, and whether the design has to match the PLC family already installed elsewhere in the plant. Leave that unsaid, get a minimum-configuration design, and the next modification means building a new panel from scratch.

The fourth is standards and internal rules. Which standards apply, what language the labels inside the panel are in, which symbol convention the drawings use, and when and in what format approval drawings are submitted. At Thai plants the Japanese head office format and local practice frequently disagree, so decide up front which one governs.

The fifth is the revision history of existing documentation. This is where modification projects go wrong most often. It is entirely normal to have three sets of drawings on hand with nobody able to state confidently which one reflects reality. The design firm will draw from whichever set it was told was current, so if that one sheet is out of date, everything downstream is misaligned.

Collected into a single view, the five bundles look like this. This works directly as a pre-order checklist.

BundleItems to lock downWhat happens if you order without them
Definition of behaviourOperating modes, sequence, wait conditions, emergency stop behaviourSafety circuit gets rebuilt, major spec changes during commissioning
Device confirmationModel, quantity, power supply spec, designated internal standardsSubstituted parts force rework on the program side
Thinking on I/OSpare points, planned future additions, alignment with existing PLC familyEntire panel rebuilt at the next modification
Standards and internal rulesApplicable standards, label language, symbol convention, approval drawing formatRejections at the approval stage, delays dealing with local authorities
Revision history of existing documentsIdentifying the drawing that reflects reality, records of past modificationsAssumptions collapse and the whole drawing set is redrawn

If your reaction to that table is “if we could pin all that down we would not have a problem in the first place,” that reaction is correct. Filling every field perfectly is not realistic. What matters is that the fields you cannot fill are not left blank. Mark them explicitly as undetermined and hand them over that way. A design firm will come back and ask about something flagged as undetermined. A blank field reads as “no requirement.” That difference is what decides whether rework happens.

Three Types of Vendor and What Each One Suits

Once the information is organized, the next question is who you give it to. Vendors that take on electrical design in Thailand fall into three broad types.

The first is the design department of a control panel builder. Because they carry the job through to panel manufacture, there is very little room for the drawings to be misinterpreted between design and build. On the other hand, their designs tend to gravitate towards the configurations they are set up for, and requirements that fall outside their standard tend to push the price up sharply. They may also be reluctant to take on a request to carve out the design work alone.

The second is a machine builder or the engineering department of a machinery trading company. They can build the circuit with a real understanding of how the mechanism moves, which makes them a good fit for new equipment installations. The catch is that the level of detail in the deliverables gets pulled along by what the mechanical side needs, and the drawings may not carry enough information to maintain the equipment yourself later. If you intend to lead future modifications in-house, the scope of the drawing package has to be written into the contract.

The third is an independent engineering firm, meaning a company whose product is the design process itself. They are the most willing to take on a design-only scope, and they can handle work that involves no new panel build at all, such as reconstructing drawings for existing equipment or designing a modification. In exchange, manufacturing and installation become separate purchases, so the buyer has to take on the role of tying the whole thing together.

Here is how the three types map onto the character of the project.

Vendor typeProjects it suitsWhat to watch for
Design department of a control panel builderStandard configurations that include a new panelReluctant to take design-only scope, weak outside their standard
Engineering department of a machine builder or traderNew equipment installed as an integrated machineNo guarantee the drawings are good enough for maintenance use
Independent engineering firmModification design, drawing reconstruction, design-only scopeBuyer has to coordinate with manufacturing and installation

This typology is not a ranking. It is a question of fit against the character of the project. Within the same plant, the right choice for commissioning a new line and the right choice for modifying existing equipment are different. More broadly, if you want to think about how to evaluate automation vendors in general rather than electrical design specifically, our article on choosing an automation company in Bangkok covers site location and support structure as well. It is a useful next step once the three types here have narrowed the field.

Why CAD Data Standardization Starts to Matter

A conversation about information granularity eventually lands on a conversation about data format. However carefully you communicate your requirements, if the deliverable arrives in a form you cannot ingest, you will be giving the same explanation all over again on the next project.

According to the explanation published by EPLAN Japan, the EIC design discipline, meaning electrical, instrumentation and control, carries the complexity of handling specifications and connection information for a wide variety of devices including DCS, PLCs, sensors, actuators, control panels, relay panels and switchgear, and standards such as ISO 10628, ISA 5.x, IEC 81346 and IEC 61355 govern schematic creation and document management. The important point is that these are not merely drafting conventions. They are rules defining how devices are identified, how they are cross-referenced, and how revisions are controlled. When the identification scheme is consistent, a drawing produced by a different company can still be read the same way. When it is not, you can read the drawing but you cannot reconcile it against your equipment register.

There are choices on the tooling side as well. Among electrical design CAD packages, E3.series, for example, has been adopted by more than 5,000 companies worldwide, primarily automotive manufacturers and industrial equipment makers. That said, which tool gets used is largely determined by the vendor’s own circumstances. What the buyer needs to secure is not “which tool did you use” but “will we receive the native data” and “does the device identification scheme map onto our register.”

The benefit of standardization shows up most clearly at companies with multiple sites. Can a drawing produced at your Thai plant be reused when a sister plant in Vietnam or Indonesia installs the same equipment? If the identification scheme and revision control line up, yes. If they do not, someone draws it again from scratch. Given that the supply of electrical designers is thinning, the ability to avoid redrawing is itself a form of procurement leverage.

Electrical Design Outsourcing 2026 | Spec Detail Beats Skill - figure 3

In practice, the workable compromise is to write three things into the contract. First, the delivery format, requiring editable native data and not PDF alone. Second, the identification scheme, deciding whether device designations and terminal numbering follow your internal rules or the vendor’s standard. Third, revision control, agreeing who updates which drawing when a modification is made on site. Accept a delivery with those three points missing and you end up in the state where the drawings are in your hands but unusable.

Cost Is Decided by the Number of Reworks, Not by Engineering Hours

Quotations state design effort in hours or man-days. Looking at that and thinking “there must be a cheaper firm out there” is a natural response, but the total you actually pay is not driven by the quoted hours. It is driven by how many times the design gets redrawn after work has started.

Redrawing an electrical design never stays contained. Change the drawing and the panel’s parts list changes, the sheet metal machining changes, the wiring changes, the PLC input and output allocation changes, the program changes, and the test schedule changes. What is a minor edit in design hours becomes an order-of-magnitude change in cost the moment it propagates downstream. And if those downstream steps sit with different companies, each of them issues its own variation charge.

Here are the causes of rework, classified by where they originate.

Cause of reworkTypical point of discoveryHow to close it in advance
Behavioural requirements revealed lateApproval drawing stage, or during commissioningDocument operating modes and fault behaviour before ordering
Device changeProcurement stageSpecify model and internal standard, state whether alternatives are acceptable
Existing drawing is out of dateAfter the site survey, or at installationVerify the revision history and attach site photographs
Misaligned understanding of the approval processOn submission of approval drawingsAgree the submission format, the approver and the turnaround time before ordering
Maintenance requirements never statedAfter handover, when operation beginsCommunicate who maintains the equipment and the drawing detail they need

Every entry in the right-hand column is work the buyer can do before placing the order. Which means most rework cost is the kind of cost you reduce through preparation, not by changing vendor. Put the other way round, with the same level of preparation, the going rate for rework cost does not vary much whichever vendor you pick.

When comparing quotations, the practically useful lens is not the absolute number but what has been left out of the scope. Is the site survey included? How many revisions of the approval drawing are free of charge? Is attendance at commissioning included? Who performs drawing corrections after handover? A cheap quotation that does not state these things will reappear later as a variation. More often than not, what makes a quotation cheap is simply that it has not priced in any rework.

Common Failure Patterns

Here is everything above, rearranged into the shapes it actually takes. None of these are exotic edge cases. They are patterns observed repeatedly at Japanese-owned plants in Thailand.

The pattern where a single-package order hides the process. The equipment is bought as a complete package and the project proceeds without anyone knowing who is doing the electrical design or when. The first time the buyer looks at the content is when the approval drawing arrives, and corrections start from there. An approval drawing is supposed to be a document for confirmation, not a document for deciding the specification. By the time specification decisions have slid into the approval drawing stage, the schedule is already in trouble.

The pattern where local operating reality never gets in. The specification is fixed at the Japanese head office and installed as-is in the Thai plant. Operator staffing, the maintenance organization, parts availability, the frequency of power interruptions, none of these local conditions appear in a head office specification. The result is a panel that is awkward to operate, or impossible to maintain, in the plant that received it.

The pattern where maintenance is not involved in the purchase. Production engineering places the order and maintenance deals with the consequences after start-up. That split is extremely common. When it happens, maintenance-side requirements, such as spare terminals, test terminals and the level of drawing detail, never make it into the specification. You get equipment that runs but cannot be repaired.

The pattern where nobody knows which drawing is current. Covered above, but it occurs most in equipment that has been modified repeatedly. One drawing that was not updated during a past modification is enough to invalidate the assumptions behind everything designed from it. Putting a site survey into the quotation as billable effort before work starts is frequently the cheapest line item in the whole project.

The pattern of mismatched language and symbols. The symbol convention on the drawings and the language on the labels swing between the Japanese head office format and local practice. Neither one is wrong. The problem is that nobody decided. Labels inside a panel that local technicians cannot read translate directly into maintenance risk.

What all these patterns share is that none of them have anything to do with the vendor’s technical ability. Bring in the best designer you can find, give them the same inputs, and you get the same outcome.

Considerations Specific to Plants in Thailand and ASEAN

Ordering electrical design in Thailand adds several considerations that do not arise on a domestic Japanese project.

First, approval and inspection processes. Depending on where the plant sits and the nature of the equipment, confirmation may be required from local authorities or from the industrial estate operator. Submission format and the language used on the drawings are sometimes specified at that point, so this has to be checked before design work starts. Leave the check until later and you will be redrawing a completed drawing set.

Second, power supply conditions and the installation environment. Dust and humidity in the surrounding area, lightning surges and voltage fluctuation feed directly into the panel configuration and the protection scheme. Import a Japanese standard configuration unchanged and the protection will be either excessive or inadequate. These conditions rarely appear in a written specification, so they are items the buyer has to state explicitly.

Third, retention of maintenance staff. Given the salary competition described earlier, there is always a real chance that the person handling electrical design or maintenance will move on within a few years. Assume turnover and the value of drawings that do not depend on one person’s undocumented understanding goes up. That means a consistent symbol convention and a traceable revision history. Drawing quality only gets evaluated on the day somebody resigns.

Fourth, the cost of stationing a Japanese engineer. Because any posting has to satisfy the BOI salary requirements noted above, the choice between bringing design in-house through an expatriate posting and buying external design resource only for the phases that need it should be compared on total cost including that level.

Fifth, consistency across multiple sites. If you have plans to roll equipment out from Thailand into Vietnam or Indonesia, it is worth thinking about drawing standardization from the very first project. A consistent identification scheme means reuse. An inconsistent one means redrawing. Paying somewhat more for the design of the first project in order to establish a standard can come out lower in total once several projects have run through.

The Market Is Growing | Trends in the Engineering Design Services Market

While the supply side thins, the demand side is expanding. According to the forecast published by markwideresearch.com, the engineering design services market is projected to grow from USD 248.6 billion in 2026 to USD 513.77 billion in 2035, at a compound annual growth rate of 8.40%. Procuring design itself from outside the company is on a path to becoming standard practice worldwide.

Translated into the working reality of a purchasing manager, that number carries two meanings. One is that sending design outside is no longer an exceptional choice. There is no need to feel apologetic about not having designers on staff. The question has moved on to how well you use external resources.

The other is that demand rising while the supply of people thins means good vendors increasingly get to choose their customers rather than the other way round. As noted earlier, for every three senior engineers who retire only one to two new graduates enter the profession, and 77% of the companies surveyed report difficulty hiring qualified engineers. These are figures drawn primarily from the United States and they do not describe conditions in Thailand directly, but the underlying structure, design resource tightening relative to demand, is the same.

That changes the competitive terms for the buyer. Negotiating power on price matters less than being easy to sell to. A customer whose requirements are organized, who answers questions quickly, and whose payment terms are unambiguous gets priority when limited design resource is allocated. Raising the granularity of your information is a quality measure and a procurement advantage at the same time.

Conclusion | Work Backwards From the Granularity of Information

Here is the argument restated in one place. When electrical design outsourcing goes wrong, the cause is not the vendor’s technical ability. It is the granularity of the information the buyer supplied. Electrical design is an independent process, distinct from both control panel manufacturing and PLC program development, and when the information handed over at that point is coarse, both downstream processes go into rework at the same time.

What needs to be settled before ordering falls into five bundles: the definition of behaviour, device confirmation, your thinking on inputs and outputs, standards and internal rules, and the revision history of existing documentation. You will not fill all of them, and that is acceptable. But do not leave the unresolved items blank. Mark them as undetermined. A blank field reads as “no requirement.”

Vendors divide into three types, the design department of a control panel builder, the engineering department of a machine builder or trading company, and the independent engineering firm, and which one fits depends on whether the project is new equipment or a modification and whether you want to carve out the design scope on its own. On deliverables, writing editable native data, the identification scheme, and responsibility for revision control into the contract is what determines the cost of your next project.

And cost is decided by the number of reworks, not by the hours in the quotation. Most causes of rework can be closed out through preparation before the order is placed, and changing vendor without addressing that changes nothing. With the global supply of electrical designers thinning, and with the talent war against Chinese-owned companies layered on top of it in Thailand, ordering on the assumption that somebody will interpret your intent no longer holds up. Raising the granularity of what you hand over is, in itself, how you manage quality, delivery and cost.

If You Want to Talk About Carving Out the Electrical Design Scope

Can electrical design be carved out and ordered on its own for your project, or would it be faster to hand over everything through to the panel build? That judgement depends on the nature of the equipment and on how your organization is set up. TOMAS TECH is based in Bangkok and works with Japanese-owned manufacturers across Thailand and ASEAN on everything from electrical design through control panels, PLC program development and production management systems. It is perfectly fine to come to us at the stage where you suspect your drawings might be out of date, or where you are not sure what needs deciding before a conversation is even useful. We can start by looking at the documentation you have and helping you work out where to begin. Please get in touch through our contact form.

Frequently Asked Questions

How is electrical design different from control panel design and manufacturing?

Electrical design is the process of deciding the circuit itself and expressing it as drawings and schedules, and its deliverables are documents such as elementary wiring diagrams, wiring lists and input and output schedules. Control panel design and manufacturing is the process of assembling the physical panel from those drawings, and its deliverables are the equipment itself and the test reports. It helps to think of the former as the process that decides how the machine will be made to move, and the latter as the process that decides how to build what has already been decided. In practice a control panel builder often takes on both, which makes the boundary hard to see, but keeping them separate in the quotation breakdown and in delivery tracking makes rework much easier to detect early.

What does it cost to outsource electrical design?

The going rate varies enormously with the number of input and output points, the complexity of the equipment, whether existing drawings are available, and whether a site survey is required, so quoting a single benchmark figure would be misleading. The more useful comparison is not the absolute number but what has been excluded from the quotation. The site survey, the number of free revisions to approval drawings, attendance at commissioning, and how drawing corrections after handover are handled. A quotation that does not state these will reappear later as a variation charge. Since rework cost does not differ much between vendors at the same level of preparation, the effective way to reduce cost is to spend the time on organizing information before you order.

How long will the electrical design engineer shortage last?

There is no basis for stating when it ends. Structurally, though, the factors that make it persist are all present. K2 Staffing data from 2025, quoted by quilter.ai, indicates that for every three senior engineers who retire only one to two new graduates enter the profession, and VDE forecasts that more than 100,000 job openings in electrical and electronic engineering will go unfilled in Germany over the next decade. These are figures from the United States and Germany and are separate from conditions in Thailand, but the underlying structure, generational turnover doing little to restore supply, is shared. From a buyer’s standpoint, it is safer not to plan on the assumption that the shortage resolves itself.

What should we watch for when ordering electrical design in Thailand?

Three locally specific points to settle first. The drawing format and language required for approvals and inspections, the installation environment including dust, humidity and voltage fluctuation, and turnover among maintenance staff. On the staffing point in particular, Chinese EV manufacturers are increasingly offering salaries 20 to 30% higher than Japanese-owned companies, and competition for engineering talent has intensified. Requiring drawings that remain readable after your engineer moves on, meaning a consistent symbol convention and a traceable revision history, is what reduces risk over the long run. If you plan to station a Japanese engineer locally, the BOI screening criteria, which set an engineer’s salary at an in-principle minimum of THB 75,000 per month, relaxed to at least THB 50,000 per month for a holder of a bachelor’s degree or higher in engineering, are also part of the in-house versus outsourced comparison.

Can we outsource just the electrical design for a small modification job?

Yes. How readily it is accepted, though, depends on the type of vendor. The design department of a control panel builder usually assumes the order comes bundled with a panel build and may be reluctant to take a design-only scope. An independent engineering firm sells the design process as its product, so it tends to be more accommodating for smaller work such as modification design or reconstructing drawings for existing equipment. For a small modification, the single most important thing is establishing which of the existing drawings reflects the current state. Start work while that is still ambiguous and the rework happens exactly as it would on a large project, small scope notwithstanding. We recommend building the site survey into the quotation as billable effort from the outset.

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