Permitting a guest home in Phoenix generally runs about 60 to 90 days from the point a complete set of plans goes to the city, which is the window we plan around for our clients. Permit and plan review fees are set by the City of Phoenix on a valuation basis, so they scale with the size and value of the structure rather than sitting at one flat number. And you do not have to run any of it yourself. Minimal Living Concepts handles permitting as part of a turnkey build, from the first zoning check through plan approval and inspections.
Which department issues an ADU permit in Phoenix?
The City of Phoenix Planning and Development Department (PDD) handles it, at 200 West Washington Street, 2nd Floor. PDD covers both halves of the job: the zoning and site planning side that decides whether a guest home is allowed where you want it, and the building plan review side that approves the construction documents. Both have to clear before a permit is issued.
Two things sit outside PDD’s building counter. Addressing Services assigns a separate address to the ADU if you want one. And if your property is in a floodplain, a historic district, or on a hillside slope steeper than 1:10, an additional review is triggered before your plans can move forward.
How long does an ADU permit take in Phoenix?
Plan on 60 to 90 days for permitting on a standard lot. That is the window we plan around for our clients, and it accounts for both the city’s review clock and the correction rounds that almost always happen at least once.
The city publishes its own initial review targets every month, which is the clearest way to see where the time goes. From the city’s July 2026 turnaround report:
| Residential plan type | City goal (calendar days) | Recent average |
|---|---|---|
| Custom and standard plans | 30 | 30 |
| Major remodels and additions (over 2,000 sq ft or more than one level) | 30 | 37 |
| Minor remodels and additions (2,000 sq ft or less, one level) | 20 | 24 |
| Plot plans | 5 | 2 |
Read those as the first review only. The city notes that turnaround fluctuates with monthly workload and project complexity, and that the first and second correction cycles are usually a little faster than the initial review if the corrections are minor. Stack an initial review, one correction round, and the site planning approval that has to happen first, and 60 to 90 days is the realistic range rather than an optimistic one.
Which row your guest home lands in is the city’s call, and it depends on how large the unit is and how it is submitted. A one-story detached unit under 1,000 square feet is a different review from a two-story attached addition.
What are the steps to get an ADU permit?
Five stages, in order. Nothing later starts cleanly until the stage before it is finished.
- Feasibility and zoning check. Confirm the lot can take a guest home at all: zoning district, lot coverage, setbacks, existing structures, utilities, and any special designation like floodplain or historic. This is the stage that saves the most money, because it is the only stage where the answer can still be no at zero cost.
- Site planning approval. Phoenix requires site planning approval before an ADU can go to residential plan submittal. This is where the footprint and placement get approved.
- Construction plans. Architecture and engineering produce the drawing set: floor plans, elevations, structural, mechanical, electrical, plumbing, energy compliance, and a plot plan drawn to scale.
- Submittal and review. The plan set goes in with a completed Construction Permit and Plan Review Application, per the city’s Residential Plan Submittal checklist. Staff first checks the package for completeness, then collects review fees and routes it to the reviewers.
- Corrections and issuance. If reviewers have comments, the plans come back, get corrected, and go in again. Once approved, permit fees are paid and the permit is issued. Inspections then happen at set intervals through the build, and a final inspection closes the permit out.
What does the homeowner do, and what does MLC do?
Short version: you make decisions, we produce and defend the paperwork.
| Stage | Homeowner | Minimal Living Concepts |
|---|---|---|
| Feasibility and zoning | Provide the address, share any HOA documents, tell us what you want the space to do | Run the site feasibility study, confirm zoning, lot coverage, setbacks, and utility access |
| Design | Choose a model, approve the layout and finishes | Architecture, engineering, and the full permit drawing set |
| Site planning approval | Sign owner authorizations | Prepare and submit, respond to staff |
| Plan submittal | Nothing | Assemble the package, submit, pay review fees, track the file |
| Corrections | Approve any change that affects design or budget | Resolve reviewer comments and resubmit |
| Permit issuance and build | Approve draws | Manage the permit from submittal through issuance, schedule and clear inspections through final |
Homeowners who want to permit a guest home themselves can. The city publishes a beginner’s guide and a step-by-step ADU process document, and PDD staff will answer questions. What most people underestimate is the correction cycle. Each round costs weeks, and the reviewer is reading a construction document set, not a sketch.
What does an ADU permit cost in Phoenix?
Phoenix calculates building permit fees from project valuation, which is building square footage times a standard rate for the occupancy type. So there is no single ADU permit fee to quote, and a 400 square foot unit and a 1,000 square foot unit are not the same number. The current Development Fee Schedule took effect January 20, 2026, and the city updates it through a Development Advisory Board and City Council review, so any figure published in a blog post has a shelf life. Fees vary, and your builder confirms current numbers against the live schedule before you commit.
Two things do stay stable. Review fees are collected when the plans are logged in and permit fees are collected at issuance, so the cost is split across the process rather than due all at once. And permitting is a small slice of the project. Our guest home models start at $155,000 for the Flex, $165,000 for the Live, $216,000 for the Live+, and $279,000 for the Dwell, turnkey under standard site conditions. Permitting fees and permitting management are both included in those starting prices, so the city’s fees are not a separate invoice arriving later. The line item that actually moves a budget is site conditions, not city fees. For a fuller breakdown, see our cost of building an ADU in Phoenix post.
What makes permitting faster or slower?
Faster:
- A complete submittal. Incomplete packages get handed back at the counter before review starts.
- A one-story detached unit that sits inside setbacks and lot coverage without needing a use permit.
- Attached and detached ADUs do not require a separate grading and drainage plan in Phoenix, which removes one review from the path.
- Phoenix is also building an ADU Standard Plan Library of pre-approved detached designs, free to residents, from its 2024 design competition with AIA Phoenix Metro. As of this writing the first four plans are still listed as in review. A plot plan is still required, and the plans must be submitted without modification.
Slower:
- Unpermitted structures already on the lot. Those have to be legalized before an ADU permit will move.
- A detached unit taller than 15 feet, which requires a use permit.
- Floodplain, hillside, or historic district designation, each of which adds a review.
- Garage conversions, which require replacement off-street parking in dustproof conditions and not in the front yard setback.
- Design changes after submittal. Every change restarts a review.
When does a lot not qualify?
Some lots do not work, and it is better to learn that in week one. The common blockers:
- Lot coverage. Every zoning district caps how much of the lot can sit under roof, and existing garages, carports, covered patios, sheds, and ramadas all count. On a lot already close to its cap, there may not be room for a guest home of usable size.
- Setbacks and placement. A detached ADU generally has to sit at least 5 feet from a street side property line and 3 feet from an interior property line, and can go to 0 feet against a fully dedicated alley. Narrow or oddly shaped lots run out of buildable area quickly.
- Size ceiling. Under Phoenix’s ordinance, on lots up to 10,000 square feet an ADU is capped at 1,000 square feet or 75 percent of the main house’s gross floor area, whichever is less. A small primary home means a small guest home.
- Utilities. Phoenix allows one combined meter service connection to the city water system. Where existing service, sewer, or panel capacity falls short, upgrades change both the schedule and the budget.
- Duplex or triplex on the lot. Lots with a duplex or triplex are not permitted an ADU.
- HOA rules. State law protects your right to rent an ADU long term, but HOA rules on accessory structures are a separate question from city zoning. Read the CC&Rs before design starts.
None of this is exotic. It is a checklist, and it is what a site feasibility study exists to run.
How the permit fits into the whole project
Permitting is one phase of four: feasibility and zoning, then architecture, then permitting, then construction. The full arc from first conversation to a finished guest home runs about eight months, and we break that down in our 8-month ADU timeline. The 60 to 90 day permit window sits inside that eight months, not on top of it.
It is also worth knowing what the state has already settled on your behalf. Arizona’s HB 2720, codified at A.R.S. section 9-461.18, requires cities over 75,000 people to allow attached and detached ADUs in single-family zones, sets a size floor of 75 percent of the main dwelling or 1,000 square feet whichever is less, makes a kitchen optional, and protects long-term rental. Phoenix updated its ordinance in late 2024 to comply. If you have heard that SB 1415 is the ADU law, that bill did not pass. We cover the details in Arizona’s ADU law explained.
Start with feasibility
The fastest permit is the one that was never going to be a problem, and you find that out with a site feasibility study before anyone draws anything. We look at your zoning district, lot coverage, setbacks, utilities, and HOA situation, and tell you whether a guest home works on your lot and what size it can be.
Browse the guest home models to see what fits, then book a consultation and we will run the feasibility on your address.
