⚠️ Maricopa County vs. City — Critical Distinction
Maricopa County's fence rules only apply to unincorporated areas. If your address is within any incorporated city (Phoenix, Scottsdale, Tempe, Mesa, Chandler, Gilbert, Peoria, Glendale, etc.), you fall under that city's building code — not the county's. Most Phoenix metro residents are in incorporated cities.
Unincorporated Maricopa County Fence Rules
For properties in the unincorporated parts of Maricopa County (areas not within any city limits), the Maricopa County Development Services Department governs fence permits. The general rules are:
| Fence Type / Location | Permit Required? | Fee |
|---|---|---|
| Residential fence or wall under 6 ft | Generally exempt | No fee |
| Fence or wall 6 ft and over | Required | $25–$60 |
| Masonry/CMU block wall (any height) | Required | $50–$120 |
| Fence in a Special Flood Hazard Area | Required | Base + floodplain fee |
| Electric fence | Required — verify zoning | Varies |
Contact: Maricopa County Development Services, 501 N. 44th Street, Suite 200, Phoenix, AZ 85008. Phone: (602) 506-3301.
Block Walls: Arizona's Most Common Fence — and Its Own Permit Category
Concrete masonry unit (CMU) block walls are the dominant residential fence type in Maricopa County — far more common than wood or vinyl due to the desert climate. Block walls require a permit at any height in most Maricopa County jurisdictions because they are structural walls subject to engineering standards for footer depth, reinforcing, and mortar composition.
Key block wall requirements across Maricopa County jurisdictions:
- Footer depth: minimum 18 inches below grade in most areas; deeper in expansive soil zones
- Reinforcing: vertical rebar (typically #4 at 48" on center) required for walls over 4 feet
- Mortar: Type S mortar required in high-wind zones
- Wall cap: CMU wall caps required for weatherproofing the top course
- Engineered drawings: some jurisdictions require stamped engineering drawings for walls over 6 feet
City of Phoenix Fence Permit Rules
The City of Phoenix (within its city limits) has its own fence permit threshold under Phoenix Development Services:
- Residential fences and walls under 6 feet: generally exempt from permit
- Fences and walls 6 feet and over: permit required (minimum $50)
- Block walls at any height: structural permit required
- Front yard: maximum 3.5 feet for open fences; 3 feet for solid walls without a variance
- Pool barrier fences: always required, separate permit
Contact: City of Phoenix Development Services, 200 W. Washington St., Phoenix, AZ 85003. Phone: (602) 262-7811. Online: phoenix.gov/pdd
Scottsdale, Chandler, Gilbert, Mesa — Key City Rules
| City | Standard Threshold | Block Wall Rule | Contact |
|---|---|---|---|
| Scottsdale | Over 6 ft requires permit | Permit required at any height | (480) 312-7020 |
| Chandler | Over 6 ft requires permit | Permit required at any height | (480) 782-3000 |
| Gilbert | Over 6 ft requires permit | Permit required at any height | (480) 503-6000 |
| Mesa | Over 6 ft requires permit; front yard over 3 ft requires permit | Permit required at any height | (480) 644-2300 |
| Tempe | Over 6 ft requires permit | Permit required at any height | (480) 350-4311 |
| Glendale | Over 6 ft requires permit | Permit required at any height | (623) 930-2800 |
| Peoria | Over 6 ft requires permit | Permit required at any height | (623) 773-7225 |
HOA Rules in Maricopa County — Widespread and Strict
Maricopa County has one of the highest HOA participation rates in the United States — an estimated 50–60% of Phoenix metro homeowners live under HOA governance. HOA fence rules in this market are typically strict, especially regarding:
- Block wall requirements — Most Maricopa County HOAs require block walls for perimeter fencing; wood fences are often prohibited or restricted to interior garden areas only
- Wall color — Stucco-coated block walls must often match the house exterior color exactly (color samples required in the ACC application)
- Gate materials and hardware — Wrought iron or powder-coated steel gates are commonly required; wood gates often prohibited on perimeter walls
- Wall height — Most Maricopa HOAs specify 5–6 foot walls as the maximum; some prohibit walls taller than 5 feet on side yards adjacent to common areas
🌵 Desert Climate Construction Notes
Maricopa County's extreme heat (110°F+ summers) and expansive clay soils create unique fence challenges. Block wall footers must account for soil expansion. Wood fence posts in direct ground contact degrade faster in the desert's heat-cool cycles than in other climates. Vinyl fences can warp in direct sun in Phoenix summers — UV-stabilized formulations are required.
Free: Fence Permit Application Checklist (PDF)
Includes an Arizona block wall section with footer and reinforcing requirements.
⬇ Download Free PDFFrequently Asked Questions — Maricopa County Fences
Search your address in the Maricopa County Assessor's parcel viewer (mcassessor.maricopa.gov). The parcel record shows the jurisdiction. If it says "City of Phoenix," "City of Scottsdale," etc., you're under city rules. If it says "Maricopa County" with no city designation, you're in an unincorporated area under county rules.
Yes — block walls (CMU construction) require a structural permit at virtually any height across Maricopa County cities and in unincorporated county areas. This is true even for a 4-foot garden wall. The permit is required because block walls are structural elements with specific footer, reinforcing, and mortar requirements that are verified at inspection.
It depends entirely on your HOA's CC&Rs. Many Phoenix metro HOAs require block walls for perimeter fencing and permit wood only for interior garden structures or rear yard features not visible from the street. Check your CC&Rs' fence and wall section before purchasing any materials. If wood is prohibited, the HOA can require removal at your expense regardless of whether the fence is otherwise code-compliant.