Maricopa, AZ Fence Regulations: Retaining Walls (2026)
Key Facts
- Front/street yard limit
- 3.5 feet, § 18.80.090(A)(1)
- Residential interior/rear
- 6 feet, § 18.80.090(A)(2)(a)
- Commercial/industrial interior/rear
- 8 feet, § 18.80.090(A)(2)(b)
- Retaining wall cap
- Matches freestanding limit, § 18.80.090(H)
- Waiver authority
- Hearing officer, up to 10 ft
- Fence-on-wall measurement
- § 18.15.030(E)(2)(a) sets rule
Summary
A retaining wall in Maricopa can't rise higher than the freestanding wall limit that applies to its zoning district and yard, per Maricopa City Code § 18.80.090(H): 3.5 feet in front/street-side yards, 6 feet in residential interior/rear yards, or 8 feet in commercial, mixed-use and industrial districts. Where a fence sits on top of a retaining wall, § 18.15.030(E)(2)(a) sets a separate measuring rule for the combined structure.
A. Maximum Height. 2. Interior Side and Rear Yards. a. Residential Districts. No fence or freestanding wall within or along the exterior boundary of the required side or rear yards shall exceed a height of six feet. b. Commercial, Mixed Use, and Industrial Districts. No fence or freestanding wall within or along the exterior boundary of the required side or rear yards shall exceed a height of eight feet... H. Retaining Walls. The height of a retaining wall shall not exceed that of freestanding wall height limits in subsection (A) of this section. Refer to MCC 18.15.030(E) for measuring wall heights for retaining and freestanding wall combinations.
Official source re-checked September 8, 2026: no newer edition of the code had been published (publisher’s edition: current through Ordinance 26-10, passed April 21, 2026).
Full Breakdown
090(A): '2. a. Residential Districts. b. Commercial, Mixed Use, and Industrial Districts. 090(A)(1). ' Where a homeowner stacks a solid fence on top of a retaining wall, the two structures don't automatically get measured together. 030(E)(2)(a) provides: 'The height of a solid freestanding fence that is on top of a retaining wall is measured from the ground level on the lowest side of the combined fence and wall. ' That setback strip must be landscaped 'in a manner to soften the combined wall mass,' though a view fence is exempt from that landscaping condition. 090(G)(1) lets the hearing officer waive the height limit up to six feet in front/street yards or 10 feet in interior side/rear yards.
Violations & Fines
An oversized retaining or freestanding wall is a zoning code violation enforceable under Maricopa City Code § 1.10.010. The city can pursue it as a Class 1 misdemeanor carrying up to a $2,500 fine and six months' imprisonment, or, more commonly, as a civil citation under § 1.10.010(B): $100 per day for a first offense, $200 for a second, $400 for any subsequent offense, up to a $2,500 default judgment per violation, recorded as a lien with the Pinal County recorder if unpaid.
Frequently Asked Questions
Can I add a fence on top of my retaining wall without it counting toward the height limit?
What's the tallest a retaining wall can be in a Maricopa backyard?
Can the height limit be waived for a commercial retaining wall?
Sources & Official References
Other rules in Maricopa
Compare Maricopa to another location·View the Arizona fence regulations overview
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