The comparison is almost always made incorrectly. A firm compares an in-house drafter's salary to an outsourced hourly rate, concludes the rates are similar, and stops. That comparison omits most of the in-house cost and all of the structural difference.
Here is the calculation done properly.
The fully loaded cost of an in-house drafter
Base salary is the smallest part of the picture. The full cost includes:
Employer taxes and statutory contributions. Varies by jurisdiction; typically a meaningful percentage above salary.
Benefits. Health cover, retirement contributions, insurance, and paid leave.
Software. Licences for the authoring platform, coordination tools, plug-ins, and PDF and markup software. This is a substantial annual cost per seat.
Hardware. A capable workstation, monitors, and peripherals, amortized over roughly three years, plus support.
Workspace. Rent, utilities, IT infrastructure, and facilities, allocated per head. In markets with expensive office space this is significant.
Training and development. Software updates, standards training, and the productivity dip that accompanies both.
Recruitment. Agency fees or internal recruiting time, plus the ramp-up period during which output is below full rate.
Management. Supervision, review, and administration time from someone more expensive.
The sum is well above salary — commonly in the range of 1.5 to 1.8 times, depending on market and benefits structure.
The utilisation problem
The larger issue is not cost per hour. It is hours available versus hours needed.
A full-time employee is paid for the year. Of that, a meaningful proportion is leave, public holidays, sick time, training, and administration. What remains is available capacity, and of that, only the portion matched by actual project demand is productive.
Design firm workload is not smooth. A practice with a strong quarter followed by a slow one pays the same fixed cost through both. Utilisation below full occupancy raises effective cost per productive hour proportionally — an employee productive 70% of the year costs roughly 43% more per productive hour than the headline figure suggests.
This is the number that should drive the decision, and it is the one almost never calculated.
The structural difference
Stated plainly:
In-house capacity is a fixed cost. It is paid whether or not there is work. It cannot be reduced quickly, and reducing it carries redundancy cost and reputational effect.
Outsourced capacity is a variable cost. It is paid when used. It expands within days for a deadline and contracts when the project completes.
For a firm with volatile workload, this difference dominates every rate comparison. For a firm with stable, predictable throughput, it matters much less, and the in-house case is correspondingly stronger.
What in-house genuinely provides
Outsourcing advocates understate these, and they are real:
Immediate availability. A question answered by walking across the room, without a time zone or a written brief.
Accumulated context. Someone who knows the firm's details, the client's preferences, and why a decision was made three months ago.
Design contribution. Experienced technicians contribute to how things are detailed, not just to how they are drawn. That contribution does not transfer easily.
Continuity and culture. Knowledge retained in the practice, and a career path that attracts and keeps good people.
No brief overhead. Work that is genuinely difficult to specify — exploratory, iterative, or design-adjacent — is faster to do in-house than to describe.
What outsourcing genuinely provides
Variable cost. The structural advantage described above.
Scale on demand. Three additional people for six weeks is a request, not a recruitment process.
Time zone extension. Work issued at the end of a day, returned by the next morning, is a real compression of documentation cycles.
Specialist capability without a permanent hire. Steel detailing, rebar detailing, verified views, and scan-to-BIM are specialisms most firms cannot justify employing full-time.
Protected senior time. The most valuable effect, and the least often measured: senior staff released from production work onto design, coordination, and client contact.
The hybrid model most firms end up with
The stable structure that most established firms converge on:
In-house: a core of experienced technicians handling design-adjacent work, detail development, standards ownership, model review and acceptance, and client-facing production. Sized to baseline workload, not peak.
Outsourced: documentation production above baseline, specialist scopes, and overflow.
Sizing in-house capacity to peak demand is the expensive error. It guarantees under-utilisation for most of the year, and it is how firms end up with a fixed cost structure that constrains what work they can afford to pursue.
Making the decision for your firm
Work through five figures:
- Fully loaded cost of an in-house drafter in your market, including everything listed above.
- Realistic productive utilisation over the last two years, honestly assessed.
- Effective cost per productive hour — item 1 divided by item 2.
- Workload volatility — the ratio between your busiest and quietest quarter.
- Proportion of work that is genuinely specifiable — documentation, detailing, takeoff — versus work that requires in-room collaboration.
High volatility and a high specifiable proportion point toward a smaller in-house core with outsourced capacity. Stable workload and a low specifiable proportion point toward in-house.
Most firms find the answer is a lower in-house headcount than they currently carry, and a partner relationship established before it is urgently needed.
The hidden cost of outsourcing, stated honestly
Outsourcing is not free of overhead. It requires:
- Brief writing. Work that was communicated verbally must now be specified.
- Review capacity. Someone must accept the delivered work, and this must be budgeted rather than absorbed.
- Standards documentation. Templates, layer standards, and BEPs must exist in written form.
- Onboarding. A pilot period before full-rate output.
These costs are real and front-loaded. They are also, notably, things a well-run practice should have anyway — firms frequently report that preparing to outsource improved their internal standards more than the outsourcing itself did.
A worked framework
Rather than a single answer, apply this sequence to your own numbers.
Step 1 — Establish fully loaded cost. Take base salary and add employer taxes, benefits, software licences, hardware amortisation, workspace allocation, training, and a share of management time. Express it as an annual figure.
Step 2 — Establish productive hours. Start from contracted annual hours. Deduct leave, public holidays, typical sick days, training, and administration. Then apply your honest historical utilisation against project work.
Step 3 — Divide. Fully loaded annual cost divided by productive project hours gives effective cost per productive hour. This is the only number comparable to an outsourced rate.
Step 4 — Model volatility. Take your busiest and quietest quarters over two years. Calculate the effective cost per hour in each. The gap between them is the cost of fixed capacity, and it is usually larger than firms expect.
Step 5 — Decide the baseline. Set in-house headcount to cover the quiet quarter comfortably rather than the busy one. Everything above that is variable capacity.
Most firms running this find their true in-house cost per productive hour is well above the outsourced rate they had been comparing against salary, and that the correct in-house headcount is lower than current.
Making the transition without disruption
Firms moving from a peak-sized in-house team to a baseline-plus-variable model do it best gradually:
Do not make redundancies to fund it. Attrition, over a year or two, adjusts headcount without the cost and the cultural damage of a reduction.
Establish the partner relationship first, on real but non-critical work, while in-house capacity still exists. Onboarding under deadline pressure is how outsourcing acquires its poor reputation.
Document standards as the first step. Templates, layer standards, and a BEP have to exist in written form. This work is valuable regardless of the outcome.
Name and budget the review role. Model and drawing acceptance is a real task. Assuming it will be absorbed is the most common implementation failure.
Redeploy, do not simply reduce. The point is to move senior people onto design, coordination, and client work. If they remain on production with a smaller team, the change has delivered nothing.
Frequently asked questions
At what firm size does outsourcing make sense? There is no threshold. A two-person practice outsourcing a documentation package three times a year benefits proportionally as much as a hundred-person firm running dedicated resources.
Does outsourcing reduce quality? It reduces quality when the brief is thin, the standards are undocumented, and no one owns review. With those in place, delivered quality is a function of the partner's capability, and capable partners exist.
What should stay in-house permanently? Design decisions, standards ownership, model acceptance, and client relationships. Production capacity is the variable component.
Related reading: How to Vet a CAD or BIM Outsourcing Partner: 12 Questions · BIM Outsourcing: A Practical Guide for AEC Firms · Bid or No-Bid: Using Estimating Capacity to Win Better Work
Vantage CAD Services provides dedicated-resource and project-based drafting, BIM, and detailing capacity for firms sizing their in-house teams to baseline demand. Contact info@vantagecadservices.com or +1 (512) 543-0831.