Maricopa County Deck Permits: City vs. Unincorporated — Which Rules Apply to You?
Having a Maricopa County address does not mean you apply to Maricopa County for a deck permit. If you live inside a city — Phoenix, Scottsdale, Mesa, Tempe, Chandler, Gilbert, Glendale, Peoria, or others — you apply to that city. Only if you live in unincorporated Maricopa County do you apply to the county. Your jurisdiction determines your rules, fees, and where to apply.
Step 1: Which Jurisdiction Are You In?
Before you do anything else, determine whether your property is inside a city or in unincorporated Maricopa County. This single determination changes everything — which rules apply, which building department you contact, what the fees are, and what drawings you need.
How to find your jurisdiction in under 2 minutes:
- Go to the Maricopa County Assessor's website: mcassessor.maricopa.gov
- Search your address or parcel number
- Look for the field labeled "Legal City" or "Municipality" in the property summary
- If it says "MARICOPA COUNTY" or "UNINCORPORATED," you apply to the county
- If it shows a city name (PHOENIX, SCOTTSDALE, MESA, etc.), you apply to that city
Many Maricopa County residents have mailing addresses in cities but live in unincorporated areas. Your mailing address city is not the same as your permit jurisdiction. A home with a "Scottsdale" mailing address might be in unincorporated Maricopa County if it was annexed before Scottsdale expanded. Always check the assessor's record, not your mailing address.
Maricopa County (Unincorporated) Deck Permit Requirements
If you are in unincorporated Maricopa County, you apply to the Maricopa County Permit Center. Here are the current requirements:
When Is a Permit Required?
Maricopa County requires a building permit for decks when:
- The deck is attached to the main structure (house) — permit always required
- The deck is elevated more than 30 inches above grade — permit required
- The deck is greater than 200 square feet — permit required
- The deck includes a roof or pergola cover — permit required regardless of size
Small freestanding decks at or near grade level under 200 sq ft may be exempt. However, Maricopa County has become more stringent about enforcing permit requirements, and voluntary compliance is strongly recommended even for borderline cases.
Maricopa County Permit Fee Schedule (2025)
| Deck Size | Permit Fee (Approx.) | Plan Review | Total Estimated Cost |
|---|---|---|---|
| Under 200 sq ft | $100–$150 | Included | $100–$150 |
| 200–400 sq ft | $150–$250 | Included | $150–$250 |
| 400–600 sq ft | $250–$400 | Included | $250–$400 |
| Over 600 sq ft | Valuation-based | Separate charge | Call for estimate: (602) 506-3301 |
Maricopa County updated its online permit portal in 2024. Applications are now processed through the Maricopa County Development Services online portal. The county has reduced walk-in services — most applications are submitted online and approved electronically.
Maricopa County Plan Requirements
For deck permits, Maricopa County requires:
- Site plan showing lot boundaries, setback dimensions, and deck location
- Floor plan (framing plan) with lumber sizes, joist spacing, beam sizes, and post locations
- Elevation drawing showing height, railing, and stair details
- Footing detail — Maricopa County has a frost depth near zero (desert climate) but requires footings to extend below the active zone in expansive soil areas. A minimum 18" depth is commonly required in Phoenix metro's desert caliche soil conditions.
Arizona-Specific: Caliche Soil and Footing Considerations
Maricopa County's desert geology presents a unique challenge: caliche — a layer of calcium carbonate-cemented soil found throughout the Phoenix metro area, typically 12–36 inches below the surface. Caliche can be nearly as hard as concrete, making footing excavation difficult, but it's also not as structurally reliable as it appears.
Maricopa County building inspectors typically require footings to:
- Extend through the caliche layer into undisturbed native soil below, OR
- Seat on the caliche layer if it's confirmed to be dense and undisturbed (the inspector determines this at the footing inspection)
- Minimum 18" depth below finish grade is the practical standard regardless of caliche location
This is something you won't find on Maricopa County's standard permit requirements page — but experienced local contractors know to plan for caliche excavation, which may require a jackhammer or rotary drill rather than a manual post-hole digger.
City-Specific Requirements in Maricopa County
If you're inside a Maricopa County city, here's what each major city requires:
| City | Permit Required When | Approx. Fee | Portal | Review Time |
|---|---|---|---|---|
| Phoenix | Attached decks always; freestanding over 200 sq ft | $150–$500+ | Phoenix Permits Online | 10–20 business days |
| Scottsdale | All decks attached to structure; elevated decks 30"+ above grade | $200–$600+ | Scottsdale ePermits | 10–15 business days |
| Mesa | Attached decks and elevated decks | $100–$400+ | Mesa One Stop Shop | 7–15 business days |
| Chandler | All permanent deck structures | $150–$400+ | Chandler ePlan | 5–10 business days |
| Gilbert | All permanent deck structures | $100–$350+ | Gilbert Online Permits | 5–10 business days |
| Glendale | Attached and elevated decks | $100–$350+ | Glendale One Stop Shop | 7–14 business days |
| Peoria | All decks over 200 sq ft or attached | $100–$350+ | Peoria Permits & Inspections | 7–10 business days |
| Tempe | All permanent deck structures | $150–$400+ | Tempe Development Services | 7–14 business days |
Scottsdale has the most stringent aesthetic review process in Maricopa County. Certain Scottsdale districts require Design Review Board approval for deck additions that are visible from the street, in addition to the standard building permit. This is separate from HOA approval and can add 4–8 weeks to the process. Check with the Scottsdale Development Services department early in your planning if you're in a Scottsdale residential area.
Setback Requirements in Maricopa County (Unincorporated)
In unincorporated Maricopa County, deck setbacks follow the zoning district requirements for the property. Common residential zoning districts and their setbacks:
| Zoning | Description | Side Setback | Rear Setback |
|---|---|---|---|
| R-43 | Rural (1 acre) | 25 ft | 35 ft |
| R1-10 | Suburban (10,000 sq ft lots) | 7 ft | 20 ft |
| R1-6 | Suburban (6,000 sq ft lots) | 5 ft | 15 ft |
| RU-43 | Rural-Urban | 20 ft | 30 ft |
Find your zoning at the Maricopa County GIS Map Viewer (maricopa.gov/5744/GIS-Maps). Enter your address and select the Zoning layer. Your zoning code determines which row above applies to your deck project.
Arizona-Specific Code Requirements for Decks
Arizona has adopted the International Residential Code (IRC) 2018 with Arizona amendments, administered through the Arizona Department of Fire, Building and Life Safety (DFBLS). Cities in Maricopa County adopt the same base code with their own local amendments.
Key Arizona-specific deck code considerations:
Wind Load Requirements
The Phoenix metro area is in a high-wind region for purposes of ASCE 7 wind design due to monsoon season, which runs July through September. Maricopa County has experienced wind gusts exceeding 70 mph during haboobs (dust storms). Your deck framing must be designed for these wind loads, which primarily affects:
- Post-to-beam connections (require positive hurricane ties or equivalent)
- Railing post connections (must resist lateral loads)
- Any pergola or cover over the deck (dramatically increases wind load on the deck structure)
Sun Exposure and Material Requirements
While not a code requirement per se, experienced Maricopa County inspectors and contractors note that the Phoenix metro's intense UV exposure and extreme heat cycles (150°F+ deck surface temperatures in summer) make certain material choices significantly more durable:
- Composite decking is far more common in Arizona than pressure-treated wood for residential decks — wood decks crack, split, and fade significantly faster in the desert climate
- Aluminum or powder-coated steel railings last longer than wood railings in Arizona's climate
- All hardware must be hot-dipped galvanized (HDG) or stainless steel — the combination of heat, monsoon humidity cycles, and pool chemicals in many Maricopa County backyards accelerates corrosion of lower-grade hardware
Contact Information
Maricopa County Development Services: 501 N. 44th St., Phoenix, AZ 85008. Phone: (602) 506-3301. Online portal: mcpermits.maricopa.gov. Hours: Monday–Friday 8:00 AM–4:00 PM. Virtual appointments available through the portal.