If you are price shopping for permit drawings, you have probably already noticed the problem. One source quotes 500 dollars, another quotes 20,000, and the per square foot numbers swing so wide they are almost useless. Both are technically right, because permit drawings are not one product. A set for a backyard deck and a set for a new custom home are different animals with different scopes, and lumping them into a single average is how the generic cost guides leave you more confused than when you started.
So here is the straight version, broken out the way you actually buy it: by project type, with 2026 ranges, the pricing models drafters really use, and the line items that quietly inflate a quote. The goal is for you to read your own project off this page and walk into a conversation knowing what a fair number looks like.
First, what you are actually paying for
A permit set is the package of drawings a building department requires to approve your project. Depending on scope, that can include a site plan showing setbacks and existing and proposed structures, floor plans, exterior elevations, building sections, a roof plan, and the structural, electrical, plumbing, and mechanical details that prove the design meets code. The drafter builds these in CAD software such as AutoCAD and delivers a coordinated set you can submit.
Two things drive the price more than anything else. The first is scope, meaning how many sheets and how much detail your project demands. The second is whether the drawings need a professional stamp. Many straightforward residential permits can be drafted and submitted without an engineer or architect seal, but anything with structural complexity, or any project a jurisdiction flags, may require stamped drawings from a licensed professional, and that stamp adds cost on top of the drafting itself. Keep those two levers in mind, because they explain almost every price difference below.
The three ways drafters price the work
Before the numbers, it helps to know how the quote is built, because comparing a flat fee to an hourly rate to a per square foot figure is comparing three different things.
Flat fee, or fixed scope, is the most common model for a defined permit set and the easiest to budget against, because you agree on the deliverable up front and the price does not move unless the scope does. Hourly billing, generally in the range of 30 to 150 dollars an hour for a drafter and higher for an architect, tends to show up on small or loosely defined jobs where nobody knows the full scope yet, which also makes it the hardest to predict. Per square foot pricing, very roughly 1 to 5 dollars a square foot for typical residential work and climbing for complex or high end builds, appears most often on new construction. The trap with hourly is the open ended total. For most permit work, a clear fixed scope quote is the number you want, because it puts the risk of overruns on the drafter, not you.
Cost by project type in 2026
These ranges reflect 2026 market pricing for the drawing work itself. Where a structural stamp is commonly needed, that is noted, because it is usually a separate cost.
A simple accessory structure such as a deck, shed, patio cover, or detached garage is the low end of the market. Drawing sets for these run roughly a few hundred dollars up to about 1,500 dollars, and for very standard structures some buyers use stock or template plans that start under 100 dollars and customize from there. The catch is that a stock plan still has to be adapted to your actual site and setbacks, which is its own small charge.
A room addition or bump out, where you are tying new structure into an existing house, typically lands somewhere around 1,200 to 5,000 dollars for the drawings, depending on size and how much of the existing structure has to be documented and modified. Per square foot, additions tend to sit around 0.50 to 3 dollars. Because additions touch existing framing, they are a common trigger for a structural stamp.
An ADU, whether a detached cottage or a garage conversion, is one of the most searched categories right now. Drawing costs vary widely with complexity, but a custom ADU permit set commonly falls in the low to mid four figures, while ready made ADU plans can start in the high hundreds, often around 575 to 1,500 dollars before site specific adaptation. A garage conversion adds a wrinkle, because an engineer usually has to verify that the existing foundation and framing can carry residential use, and that structural check is an extra cost worth budgeting for from the start.
A full custom single family home is the top of the residential range and the reason the headline averages look so scary. A complete set of construction documents for a new house generally runs from a few thousand dollars on the modest end to 20,000 dollars or more for larger or higher end homes. If you hire a full service architect rather than buying a plans only package, you are usually looking at a percentage of construction cost, commonly in the 8 to 15 percent range for residential, which is a different and much larger commitment than a permit set alone.
Light commercial work, such as a tenant improvement or a small commercial build out, is priced by scope and tends to start higher than comparable residential work, because commercial permits pull in more disciplines, stricter accessibility requirements, and more frequent demands for stamped, engineered drawings. For these, a fixed scope quote based on your specific space and use is far more reliable than any square foot rule of thumb.
The costs that are not in the headline number
The drawing fee is rarely the whole story, and the surprises are predictable enough to plan for.
A structural engineer's involvement, whether a full design or just a stamp and review, is the most common add on, billed hourly or as a flat fee on top of the drafting. If you do not already have existing drawings, an as built measurement of the current structure is its own charge before new work can even be drawn. Revisions are the other big one. A quote usually assumes a set number of draft rounds, and extra rounds, scope changes mid project, or rush turnarounds add to the total. And to be clear about one thing the cost guides blur, none of the numbers above are your building department's plan check fees. Those are paid to the jurisdiction, separate from what you pay your drafter, and they vary by location and project value.
The single biggest source of unexpected cost, though, is a vague scope at the start. When nobody pins down exactly which sheets and which level of detail the project needs, the quote drifts, and an hourly arrangement drifts fastest. The fix is to define the deliverable precisely before any drawing begins.
How to get a number you can trust
The reason these ranges are so wide is that a price quoted without a defined scope is a guess. The way to collapse a 500 to 20,000 dollar spread into a real figure is to specify the project: the type, the size, the jurisdiction, whether existing conditions need documenting, and whether a stamp is likely required. Once that is fixed, a competent drafter can give you a firm, fixed scope price rather than a placeholder average.
That is exactly the work to do first. A focused look at your scope of work determines which sheets your permit actually requires, architectural drafting produces the coordinated set, and a site plan package handles the setback and site documentation many jurisdictions demand alongside it. You can see how we structure pricing on our estimate page.
Get a fixed scope pricing estimate for your permit drawings in 24 hours. Tell us the project and the jurisdiction, and you get a real number instead of a range.