When a permit correction needs a structural engineer
Most residential houses can be designed with the prescriptive rules in the International Residential Code — span tables, header tables, braced wall rules. When a design goes beyond those rules, the reviewer asks for engineering. Typical wording:
- “Provide structural calculations for beam ___” — long spans, heavy point loads, LVL/steel beams outside tables.
- “Provide engineered lateral design” — large openings, open floor plans, high wind or seismic areas.
- “Provide engineered foundation” — expansive soils, slopes, basements, retaining walls.
- “Plans must be sealed by a licensed engineer” — some jurisdictions require it for certain sheets or all structural work.
- “Provide truss calculations” — usually from the truss manufacturer.
When you probably don’t need one
Some structural-sounding comments are really documentation gaps a drafter can close:
| Comment | Often resolved by |
|---|---|
| “Provide header sizes” | Sizing standard headers from IRC tables and labeling them |
| “Show anchor bolts / hold-downs” | Adding prescriptive notes and details |
| “Show braced wall lines” | Adding a braced wall plan per prescriptive rules |
| “Provide footing detail” | Adding a typical footing section per code minimums |
Whether the prescriptive path applies depends on your design and local amendments. When it doesn't, an engineer is required — there's no drafting workaround.
What to send the engineer
- The correction letter, with the structural comments highlighted.
- The full current plan set (floor plans, roof, sections, foundation).
- Soils report, if one exists; site location for wind/seismic/snow loads.
- Roof and floor framing assumptions: trusses vs. rafters, joist type and spacing.
- Your deadline — engineers prioritize what they know is urgent.
Coordinating calcs with your drawings
The most common reason structural comments come back: the calcs and the drawings don't match. After the engineer finishes:
- Update every beam, header, post and footing on the drawings to match the calcs.
- Add the engineer's details or reference them by sheet and number.
- Cloud the changes and reference the calcs in the response letter (“provided under separate cover”).
When soils reports are required, what they cost and how they affect your foundation design.
Read the guideTime and cost
Engineering fees for residential correction items vary widely by region and scope — a single beam calc is a very different job from a full lateral design. Turnaround is commonly one to three weeks. Because engineering is usually the slowest part of a resubmittal, order it the day you receive the letter, while the drafting fixes happen in parallel.
How we handle engineering items
Our Permit Correction Service sorts every comment in your letter the moment you upload it. Comments requiring licensed structural, civil, energy or other engineering services are identified separately, with a plain-English description of what to ask the engineer for. We fix all the drafting comments — $499 flat — and update the drawings to match your engineer's calcs once you have them. We don't stamp drawings or alter sheets stamped by another professional.
Frequently asked questions
Does every house plan need a structural engineer?
No. Many houses are designed with prescriptive IRC rules. An engineer is needed when the design goes beyond those rules or when your jurisdiction requires sealed structural drawings.
Can a drafter answer a beam calculation comment?
Not if the reviewer asks for calculations. A drafter can size standard headers and beams from code tables, but engineered calculations must come from a licensed engineer.
How long do structural calcs take for permit corrections?
Commonly one to three weeks depending on the engineer and scope. Order them as soon as you receive the correction letter.
What should I ask the engineer for?
Calculations and stamped details for the specific structural comments in your letter, plus anything the reviewer says must be sealed.
Can you coordinate my drawings with the engineer’s calcs?
Yes. We fix the drafting comments and update the drawings to match your engineer’s calculations as part of the Permit Correction Service.