Short answer: a city won't issue a permit from plans ChatGPT drew, but the work isn't wasted. ChatGPT is good at the parts of a permit set that are the same everywhere: the sheet list, general notes, a room layout. It can't produce the parts a plan checker reads closely, because those depend on measurements, products and code sections it has never seen for your house. A drafter can turn the first kind into a submittable set; the second kind has to be drawn from scratch.
We see this more every month. One New Jersey homeowner spent five or six hours with ChatGPT working through the sheets for a 272 sq ft sunroom before contacting us in 2026, and came out with an S-1, an S-2 and four architectural sheets, and a long list of items marked "verify" or "TBD". This post is about that list: what was on it, why AI couldn't close it, and how to get from there to a set your building department will review.
The parts ChatGPT gets right
Credit where it's due. A long ChatGPT session usually produces a sensible sheet index (cover, site plan, floor plan, elevations, sections, structural, electrical, energy), the general notes that appear on nearly every residential set, a rough room layout, and a reasonable explanation of what each sheet is for. For an owner who has never seen a permit set, that's a real education, and it makes the conversation with a drafter faster.
What it produces is a description of a permit set. The reviewer needs the set itself, drawn to scale from your house.
The "verify" list AI can't close
Every item below came up on real 2026 projects. None of them can be answered from a chat, because each one depends on something physical: a measurement, a product, a site condition, or a local amendment.
| Item | Why a chat can't settle it | Where the answer comes from |
|---|---|---|
| Roof covering vs roof slope | The code sets a minimum slope for each roofing type. Asphalt shingles need at least 2 in 12 (IRC R905.2.2), and the sunroom roof came out at roughly 1 1/4 in 12, so shingles were off the table no matter what the drawings said. | Measured slope, then a roofing product rated for it (metal or membrane in that case) |
| Beam and header sizes | Spans, loads and snow or wind values are site-specific. An AI can quote a span table; it can't confirm the load path through your existing house. | The code's prescriptive tables, or an engineer's calculations where the city requires them |
| Window and glass performance | Energy compliance runs on the U-factor and SHGC of the actual units you're installing, from their NFRC labels. Reused or salvaged windows make this harder, not easier. | Manufacturer data, then REScheck, Title 24 or your state's equivalent |
| Egress openings | Sleeping rooms need an emergency escape opening of at least 5.7 sq ft net clear (5.0 sq ft at grade), with the sill no higher than 44 in (IRC R310). The plan has to show real window sizes that meet it. | The window schedule, checked against the code |
| Dimensions of the existing house | An addition is drawn against what's already there. AI has never stood in your kitchen. | Tape measurements, photos, an old survey, or a 3D scan |
| Local amendments | Cities adopt the model codes with their own changes, and some ask for things (a drywell for new roof area, a soils report, a separate set per unit) that no general model mentions. | Your building department's checklist, or a call to the counter |
The signature problem
Even a perfect AI-drawn set runs into a second question: who is allowed to submit it. Some jurisdictions let an owner submit plans for their own home without a professional seal, within limits. The New Jersey owner's construction official confirmed that, along with the catch the owner repeated to us on the call: you can't take someone else's architectural drawings and put your own name on them. Plans you submit as the owner have to be yours, or carry the name of whoever prepared them.
Before you spend more hours in a chat, ask your building department two questions. Does this project need a licensed professional's seal? And who may sign the plans? The answers decide whether you need a drafter, an engineer, an architect, or some mix.
Turning your AI draft into a submittable set
- Keep everything ChatGPT gave you. The sheet list and your notes on what you want save real time.
- Measure the existing building, or book a scan, and photograph every wall the new work touches.
- Collect product data: window labels or spec sheets, the roofing you want, any equipment.
- Get the two answers from your building department (seal required, who signs).
- Hand the whole package to a drafter. On the sunroom, the owner's AI work and their own handoff notes became the brief, and the drafting quote was fixed before any money moved.
The cost of finishing the job
At ArchWorkPro the price doesn't change because ChatGPT got there first. It's $1 per square foot of drawn area with a $1,200 minimum, or $195 per sheet for new construction under 1,200 sq ft. The AI draft can shorten the job, but the fee is fixed in writing before we start, either way.
| Project | What sets the fee | Drawing fee |
|---|---|---|
| Sunroom or small addition, drawn with the rooms it opens into | Drawn area, often well over the addition's own size | $1 per sq ft, $1,200 minimum |
| 400 sq ft new backyard cottage | 12 sheets × $195 | $2,340 |
| Garage conversion | Project minimum | $1,200 |
An engineer, when the project needs one, is hired and paid by you directly; on recent house jobs that has run roughly $1,200 to $1,800. City permit fees go to the city. More detail is on our page for owner-builders and the permit set breakdown.
Frequently asked questions
Can ChatGPT make permit-ready house plans?
No. It can outline a permit set and explain each sheet, but it can't produce scaled drawings based on your measured house, real product data and local code amendments, which is what a plan checker reviews. Treat its output as a brief for whoever draws the set.
Will the building department accept AI-generated drawings?
Departments review content, not tools. Drawings get rejected for missing dimensions, code conflicts or a missing seal where one is required. AI-only drafts usually fail on those points because they lack site-specific information, not because a computer made them.
Can I submit plans I made myself as a homeowner?
In some jurisdictions, yes, for your own home and within limits on size and structure. You still can't put your name on drawings someone else prepared. Ask your building department whether your project needs a licensed professional's seal and who may sign the plans.
Is it worth sending my ChatGPT work to a drafter?
Yes. A clear sheet list, your notes and your decisions make the brief faster to write and reduce back-and-forth. The fee at ArchWorkPro is fixed before work starts, so the AI draft can only help.
How long does it take to turn an AI draft into a permit set?
A full permit set usually takes 5 to 10 business days once we have measurements and product data. Smaller sets come back in days. Plan check time at your city comes after that.
Have a ChatGPT draft and a deadline? Send it with your measurements and photos. Within 2 working hours you'll have a fixed fee, the sheet list and a delivery date.