A&E firm playbook
Structural & Civil A&E Firm Playbook: Subconsultant Markup Rules, Responsible Charge & Professional Liability Deductibles
A prime A&E firm that hires a structural or civil subconsultant carries three exposures at once: the markup it can defend to the owner, the seal rules that decide who may sign, and the liability deductible that lands on whoever caused the claim. On a typical commercial structural scope priced at 1.2% of structural construction cost, one uninsured deductible can exceed the whole subconsultant fee. Write the risk allocation down before the first drawing.
01The four decisions a prime firm makes on every subconsultant
Most disputes between prime and subconsultant trace back to one of four decisions made casually at proposal stage.
- Who holds responsible charge. Under the NCEES Model Law, which most state boards follow closely, a licensee may seal only work prepared under their responsible charge, meaning direct control and personal supervision. If your in-house PE will seal a subconsultant's structural design, your PE must actually direct it. If the subconsultant seals, they own the design and you own coordination.
- Which entity is licensed where. Over 38 states require the firm, not only the engineer, to hold a firm registration or certificate of authorization, with a designated engineer in responsible charge. A subconsultant with a licensed PE but no firm registration in the project state can stall permitting.
- What markup you charge the owner. Owners increasingly ask for it in the fee proposal and some public contracts cap it.
- How liability flows. Indemnity, insurance limits, deductibles and whether the subconsultant's policy names you as additional insured where available.
Each decision is cheap to settle in the subconsultant agreement and expensive to settle after a claim. Industry form agreements such as AIA C401, the standard form between architect and consultant, are a sensible starting point because they flow prime contract terms down to the consultant. Read the flow-down clause carefully: it pulls in every obligation of your owner contract, including ones the subconsultant has never seen.
02Subconsultant markup: what is defensible
A markup on subconsultant fees pays for real work: coordination, QA review, carrying the contract risk, and financing the gap between paying the subconsultant and being paid by the owner. Price it to those costs, and be ready to show them.
| Contract type | Approximate markup range | Common constraint |
|---|---|---|
| Private commercial, lump sum | Built into fee, often 5%-15% equivalent | Owner may ask for an itemized fee |
| Private commercial, hourly or T&M | 5%-15% on subconsultant invoices | Stated in the fee schedule |
| State and municipal public work | Often 0%-10%, sometimes fixed by the agency | Agency rules or qualification-based selection terms |
| Federal work | Negotiated as part of overall price | Federal Acquisition Regulation cost principles apply |
| Design-build, engineer under contractor | Varies widely | Contractor's terms usually control |
A markup with no review behind it is hard to defend if a claim arises, because the owner will argue the prime added nothing. Record the QA you perform: a redline set, a coordination checklist, and a sign-off date. That record supports both the markup and your standard-of-care position.
03Responsible charge, seals and offshore drafting
Sealing is the point where liability attaches. State boards treat sealing work you did not direct as a serious violation, commonly called plan stamping. The rules that matter for prime firms:
- Seal only what you controlled. If a subconsultant prepares calculations and your PE seals them, your PE needs evidence of direction: design criteria they set, reviews they made, changes they ordered. A one-page review letter after the fact is rarely enough.
- Offshore detailing is allowed under control. Using a drafting bureau at $12-$18/hr for structural steel detailing or BIM is common and lawful when your licensed engineer directs and checks the work. Budget the house benchmark of 18% internal review overhead on those billings. Without that review the seal is exposed.
- Structural licensing states. Illinois requires a licensed Structural Engineer for structural engineering under its Structural Engineering Licensing Act. California, Washington, Oregon, Nevada, Hawaii and Utah impose SE requirements for significant structures, schools or hospitals in various forms. Florida's threshold building rules under F.S. 553.71 and 471 require a special inspector. Check the board's current rule for your structure type.
- Retention. Keep calculations, criteria and review records for at least the period your board and statute of repose suggest, commonly 3 to 10 years after completion.
For state-specific seal rules, see the Illinois SE vs PE guide and the Florida threshold building guide.
04Professional liability: limits, deductibles and the contract
Professional liability (errors and omissions) policies for design firms are commonly claims-made: the policy in force when the claim is made responds, not the one in force when the drawing was sealed. That has three procurement consequences.
- Require continuous coverage. Ask subconsultants to maintain coverage for a set number of years after completion, or to buy an extended reporting period if they close or switch carriers.
- Know their deductible. Small structural and civil firms commonly carry deductibles in an approximate market range of $10,000-$100,000 per claim, with limits of $1M-$2M per claim for many small firms. A subconsultant that cannot fund its deductible may not be able to settle quickly, which drags you into defense costs.
- Match indemnity to insurance. Professional liability policies commonly exclude liability assumed by contract beyond what the law would impose anyway. An indemnity clause that goes further than negligence may leave the subconsultant uninsured for exactly the claim you worry about. Many states also limit indemnity clauses in design and construction contracts.
Ask for a certificate of insurance showing the professional liability limit and deductible, not just general liability. Ask whether defense costs erode the limit. Then compare that limit with the fee and the construction value. A $1M limit on a $40M structure is a business decision you should make knowingly, not discover later.
05A QA review protocol the prime can actually run
The prime's review is not a second design. It is a structured check that the subconsultant's work fits the project and the contract. A protocol that works for most structural and civil packages has five steps.
- Basis of design sign-off. Before calculations start, the prime confirms codes, occupancy, risk category, loads and geotechnical inputs in writing.
- Coordination redline at each milestone. Check grids, levels, openings, equipment loads from MEP and architectural changes against the structural set. Most claims start as coordination gaps, not calculation errors.
- Spot check of critical elements. A senior engineer checks a sample of governing members, connections or retaining walls. Record which ones and the result.
- Specification and drawing consistency. Material grades, special inspection requirements and deferred submittals match across drawings and specifications.
- Permit comment closeout. Every plan reviewer comment has a written response and a revised sheet reference.
Budget the protocol at a fixed number of hours per milestone and charge for it openly. Automated drawing QA tools can speed step 2 and step 4; check their output like any other junior reviewer.
06Cost model: a $3.2M structural package in a high-seismic state
A mid-rise commercial building in Washington with $3.2M of structural construction cost. The prime architect hires a structural subconsultant.
- Base structural calcs and seal: MAX($3,800, $3,200,000 x 0.012) = $38,400.
- High-seismic SE review multiplier: $38,400 x 1.35 = $51,840 subconsultant fee.
- Prime markup at 10%: $5,184. Owner pays $57,024 for the structural scope.
- Subconsultant uses an offshore bureau for 400 hours of steel detailing at $14/hr = $5,600, plus 18% review overhead = $1,008. Landed detailing cost $6,608.
- Firm registration in the project state if not already held: about $425 for comity and COA filing at the house average.
Now the risk side. Suppose a connection error leads to a $250,000 claim. With a $50,000 deductible, the subconsultant pays almost its entire fee out of pocket. The prime's $5,184 markup is about 2% of the claim. That is why the prime's review record and the subconsultant's insurance terms matter more than the markup percentage. Price your own scenario with the PE stamp and plan review fee calculator.
07Subconsultant agreement checklist
Use this as a pre-signing review. Every row should have a clause number next to it.
| Item | What to confirm | Evidence to collect |
|---|---|---|
| Licensing | PE or SE licence and firm registration in the project state | Board lookup printouts dated at signing |
| Responsible charge | Named engineer who will seal, and their supervision of any drafting | Org chart and drafting workflow |
| Scope and criteria | Codes, loads, design criteria and exclusions listed | Signed basis of design |
| Insurance | Professional liability limit, deductible, claims-made terms, post-completion period | Certificate showing PL limit and deductible |
| Indemnity | Limited to negligence and consistent with the insurance | Counsel or carrier review note |
| Flow-down | Prime contract terms attached and acknowledged | Signed acknowledgement page |
| Records | Calculation retention period and access after project close | Retention clause |
Run the checklist at proposal stage, contract stage and before each permit submission. If the subconsultant is also using an offshore detailing bureau, see the dedicated CAD and BIM FTE contract audit for the terms to flow down.
08Run the numbers: multi-state PE stamp, plan review and NCEES comity fee calculator
The same benchmarks as this sheet, with your inputs. Share link and printable brief open the full calculator page.
Benchmarks are typical 2025-2026 market ranges compiled by Engineer Aid, an independent desk not affiliated with the vendors named. Quotes vary by region, volume and timing; nothing here is legal, tax or engineering advice. Revised 2026-11-06.
Questions buyers ask
Can a PE seal drawings prepared by a subconsultant?
Only if the PE had responsible charge of the work, meaning direct control and personal supervision, as the NCEES Model Law and most state boards require. Sealing work you did not direct is treated as plan stamping. Otherwise the subconsultant's own engineer should seal it.
What markup do A&E firms charge on subconsultants?
Observed market practice is roughly 5% to 15% on private work, often lower or fixed by the agency on public work. Check the owner contract first, since some cap or prohibit markup. Keep records of the coordination and QA the markup pays for.
What deductible do structural engineering firms carry?
Small and mid-size structural and civil firms commonly carry professional liability deductibles in an approximate range of $10,000 to $100,000 per claim, with limits often of $1M to $2M. Ask for a certificate showing the professional liability limit and deductible, and whether defense costs erode the limit.
Does my subconsultant's firm need to be registered in the project state?
In many states, yes. More than 38 states require an engineering firm offering services there to hold a firm registration or certificate of authorization with a designated engineer in responsible charge. Check the state board's lookup before signing.
How long should structural calculations be kept?
Commonly 3 to 10 years after completion, depending on the state board rule and the statute of repose for design claims. Many firms keep sealed calculations longer. Write the retention period and post-closure access into the subconsultant agreement.