
Guide · Plan Readiness
Already have plans?
Bring them. But before you send them out for bids, it is worth knowing whether they are actually buildable here, because a set of drawings can look finished and still be months away from a permit.
A set of plans is ready to build in Arizona when it includes a site plan with setbacks, floor plans, elevations, a foundation plan, structural drawings sealed by an Arizona-registered engineer, electrical and plumbing layouts, wall sections and details, and an energy code compliance path, all drawn to your actual lot and your jurisdiction's current code cycle. Stock plans bought online almost never meet that standard without Arizona-specific engineering and re-siting. Matson Signature Builders reviews existing plans as part of a free consultation and will tell you specifically what is missing before you spend money on bids.
The permit-set checklist
Every Valley jurisdiction publishes its own residential submittal requirements, and they differ in the details. But a set that is genuinely ready to submit will have essentially all of this. Go through your drawings and check:
- Site plan: property lines, dimensioned setbacks, existing and proposed structures, lot coverage calculation, easements, driveway and drainage.
- Floor plans: dimensioned, with room names, door and window schedules and egress noted.
- Exterior elevations: all four sides, with heights, materials and finish grade.
- Foundation plan: footing sizes, slab details, post and hold-down locations.
- Structural / framing plans: sealed by an Arizona-registered engineer where the scope requires it. Beam sizes, headers, shear walls, connection details.
- Roof plan: pitch, framing direction, truss layout or a truss deferral note.
- Electrical plan: device and fixture layout, panel location, load calculation.
- Plumbing and mechanical: fixture locations, waste and vent, equipment sizing and duct layout.
- Wall sections and details: how the assembly actually goes together at the critical joints.
- Energy code compliance: the prescriptive or performance path documentation your jurisdiction requires.
- HOA approval: where applicable, most cities want it in the package.
If your set is a floor plan and an elevation, you have a concept, not a permit set. That is a completely normal place to be. Just do not send it out for hard bids and expect the numbers to mean anything. Every contractor will fill the gaps with different assumptions, and the bids will not be comparable.
If you bought plans online
Stock plan sets are genuinely useful for one thing: showing a builder the layout and the look you want. What they are not is buildable in Arizona out of the envelope.
What is typically missing or wrong:
- No Arizona structural engineering. Plans drawn for the Midwest are designed for snow loads and basements. Ours are designed for wind, seismic category, expansive soils and slab-on-grade. A city will not permit unsealed structural work.
- Wrong energy code path. Our climate zone drives insulation, glazing and duct requirements that a generic set will not address.
- No relationship to your lot. Setbacks, orientation, drainage, utility stubs and soils are all site-specific.
- Details drawn for other assemblies. Basement foundations, vented crawlspaces and framing details that do not match how we build here.
Budget for an Arizona designer and a registered engineer to convert the set. It is usually a fraction of a full custom design, and it is not optional.
What is usually missing, in order of how often we see it
- Sealed structural drawings. Number one by a wide margin.
- A real site plan with dimensioned setbacks. Concepts almost never have this.
- Electrical load calculation. Especially on additions and ADUs, where the existing panel may not carry the new load.
- Energy code documentation. Easy to add, easy to forget, and it will hold your permit.
- A finish and fixture schedule. Not required for a permit, but without it no bid you receive is comparable to any other.
- HOA architectural approval. Frequently the longest single item, and frequently started last.
How we review plans
Send us what you have, a PDF is fine, and we will look at four things.
1. Can it be permitted?
We compare your set against your jurisdiction's submittal checklist and tell you what is missing and roughly what it costs to fill.
2. Can it be built as drawn?
This is the constructability review, and it is where having a builder look at drawings earns its keep. Beams that cannot get into the space. A duct run with nowhere to go. A window that lands on a shear wall. A shower drain over a post-tension cable. None of these are the designer's fault exactly; they are just things you see from the field rather than from the desk.
3. What will it cost?
Once we know the scope is real, we price it line by line against our published ranges, so you can see where your project lands relative to what things cost here.
4. Is there a cheaper way to get the same thing?
Not a cheaper house. The same house, built smarter. Often that is a roofline simplification or a structural span that drops a beam size, and it is worth five figures for a day of thinking.
If the bids come back over budget
This is common enough that you should plan for it rather than be shocked by it. The productive response is value engineering, in roughly this order of return:
- Simplify the roof. Every plane, valley and dormer costs framing, sheathing, flashing and labor. Roof complexity is the most under-appreciated cost driver in residential construction.
- Reduce structural spans. A wall or post in the right place can take a $9,000 beam down to a $1,200 beam.
- Revisit the window and door package. Sizes, operation type and glazing spec swing a big number.
- Change the finish schedule, not the structure. Tile, counters, plumbing fixtures and lighting are the easiest things to adjust and the easiest things to upgrade later.
- Phase it. Build the shell and the systems properly now, finish the bonus room in two years. Never phase by lowering the quality of what is inside the walls.
What we would not do is shrink the square footage first. Reducing size cuts cost less than people expect, because the expensive parts (kitchen, baths, mechanical, foundation, roof) do not scale down proportionally.
Plans FAQ
Questions about existing plans
I already have plans. Can you just build them?
Usually, yes, after a review. We look at whether the drawings are complete enough to permit in your jurisdiction, whether they are structurally engineered for Arizona, and whether anything in them will be a problem in the field. Then we price them. If they need work to get permit-ready, we tell you exactly what is missing before you spend anything.
What makes a set of plans "permit ready" in Arizona?
At minimum: a site plan showing setbacks and lot coverage, floor plans, exterior elevations, a foundation plan, a framing or structural plan sealed by an Arizona-registered engineer where required, electrical and plumbing layouts, a roof plan, wall sections and details, and an energy code compliance path. Jurisdictions in the Valley vary on the exact submittal checklist, and most publish theirs online.
I bought plans online. Will they work here?
Almost never as-is. Stock plans are usually drawn to a generic code and a generic climate, without Arizona structural engineering, without our energy code path, and without any relationship to your actual lot, setbacks or soil. They are a fine starting point for a layout you like. Budget for an Arizona designer and engineer to make them buildable.
Do you charge to review my plans?
The initial look is part of the free consultation. If your project needs a deeper constructability review, redlining or a value-engineering pass, we will tell you up front what that involves and what it costs before anything is billed.
Can I keep my architect and still hire you to build?
Yes, and it works well when we are brought in early. Having the builder in the room while the drawings are still cheap to change catches the expensive decisions before they are locked in. Bring us in at design development rather than after the construction set is sealed.
My plans were drawn for a different lot. Does that matter?
A lot. Setbacks, lot coverage, drainage, solar orientation, utility stub locations, soil conditions and HOA design guidelines are all lot-specific. The building may transfer; the site plan will not. Expect real work to re-site a plan.
Who owns the plans I paid for?
You do, subject to whatever your agreement with the designer says about reuse. Check that agreement before you assume you can build the same plan twice or hand it to another builder.
How long are plans good for?
Practically, a few years. Arizona jurisdictions adopt new code cycles periodically, and drawings done under an older cycle may need updating, most often on energy code, egress and structural connection details. Permits themselves also expire if work does not start.
Do I need a licensed engineer?
For anything structural (new foundations, load-bearing changes, additions, second stories, long spans, tall walls) yes, and it has to be an Arizona-registered engineer. Cities will not issue a permit on unsealed structural drawings, and a builder who offers to work around that is offering you a liability, not a savings.
What if my plans come back over budget?
That happens often, and it is fixable. Value engineering means finding the same result for less money: simplifying a roofline, reducing the number of structural spans, changing a window package, revising a finish schedule. It is much less painful than it sounds, and it is a lot cheaper on paper than after framing.
Start Your Project
Send us your drawings.
Email the set to DMatson@MatsonSignatureBuilders.com or call 623-271-4172. We will tell you honestly whether they are ready to build, what is missing, and what it will cost to put in the ground.
Last updated August 2026 · Matson Signature Builders · Licensed Arizona contractor ROC 336562