How Gilbert Handles Accessory Structures: A Practical Guide

Gilbert maintains 121 local ordinances across all categories, and 3 of those deal specifically with accessory structures. Here is a breakdown of what the city actually requires, what is prohibited, and where Gilbert falls on the strict-to-permissive spectrum compared to other cities.

ADU Rental Restrictions

Gilbert's Land Development Code states directly that an accessory dwelling unit may be rented or leased separately from the principal dwelling: there is no owner-occupancy requirement or minimum-tenancy rule in this section, and the allowance is repeated for the larger, permit-tier ADUs as well.

Key details: Separate rental allowed: Yes: no owner-occupancy requirement. Applies to: Both standard and Use Permit-tier ADUs. Minimum lease term: None specified in this section. Underlying condition: ADU must meet §5.2.3 size/count standards first.

Renting a properly permitted ADU separately from the primary dwelling is not itself a violation under Section 5.2.3(4)(f); however, renting out an ADU that exceeds the lot's permitted unit count, size cap, or that was built without the Administrative Use Permit required for units over 1,000 square feet remains a zoning violation regardless of the rental allowance.

The rules around adu rental restrictions in Gilbert lean permissive, but that does not mean anything goes.

Shed & Carport Rules

In Gilbert's SF-43 single-family district, the Land Development Code lets you build an unlimited number of detached accessory structures like sheds and workshops, but caps them at 30 feet tall and ties every one to the same setbacks as the house unless it sits in the rear two-thirds of the lot, where a reduced 5-foot setback applies only under 10 feet in height.

Key details: Max accessory structure height: 30 feet (SF-43). Number of structures allowed: Unlimited. Default setback: Same as primary structure. Rear 2/3 reduced setback: 5 ft under 10 ft tall. Setback step-up: +1 ft per ft of height over 10 ft.

Accessory structures that exceed the 30-foot height cap, sit outside the building envelope without qualifying for the reduced rear-setback allowance, or push total lot coverage past the district maximum violate the Zoning Code. LDC §1.8.A carries forward pre-existing violations as continuing violations "subject to penalties and enforcement under Enforcement," and the Town's Zoning Administrator is the official charged with interpreting and applying these standards (LDC §1.9).

ADU Rules

Gilbert's LDC caps single-family lots at one detached and one attached accessory dwelling unit, with a second detached unit allowed only on parcels of an acre or more if one ADU is restricted-affordable. Every ADU is also capped at 75% of the primary home's floor area and cannot exceed the base district's height or lot coverage.

Key details: Detached ADUs allowed: 1 (2 on ≥1-acre lots with an affordable unit). Attached ADUs allowed: 1 per lot. Size cap: 75% of primary dwelling's gross floor area. Height/lot coverage: Capped at base zoning district limits. Sequencing rule: ADU cannot precede the primary dwelling.

An ADU built beyond the permitted count, over height, over the base district's lot-coverage cap, or larger than 75% of the primary dwelling's floor area does not meet Section 5.2.3 and will not clear Development Services zoning review; a permit for such a structure would be denied or the built structure could be pursued as a zoning code violation requiring correction.

The Bottom Line

Gilbert's accessory structures rules are a mixed bag. Some areas are strict, others are relaxed, and the details matter. The best approach is to check the specific rule that applies to your situation rather than assuming Gilbert is broadly strict or permissive.

Keep in mind that Gilbert can amend these rules at any council meeting. For the most current version of any rule mentioned here, check the specific ordinance page, where we track updates as they happen.