Plano's Accessory Structures: The Rules That Matter

Every city handles accessory structures a little differently. In Plano, Texas, there are 2 distinct rules that residents and property owners should be aware of. Some are stricter than what neighboring cities enforce, and others are more relaxed. Here is what you need to know.

ADU Rules

Plano allows one backyard cottage per lot citywide under Zoning Ordinance § 15.1800, provided the lot is at least 6,000 square feet and the cottage stays on the same lot as the main house rather than becoming a separately sellable unit. The cottage's floor area must run between 400 and 1,100 square feet, or 50% of the main home's habitable area if that's smaller, and sit at least 10 feet from the main dwelling without exceeding its height.

Key details: Cottages per lot: 1 maximum. Minimum lot size: 6,000 square feet. Cottage floor area: 400–1,100 sq ft (or 50% of main home). Min. separation from main house: 10 feet. Height limit: May not exceed main dwelling.

Because backyard cottages are regulated through the Zoning Ordinance, § 1.700's general violation clause applies: a person found violating any term of the ordinance is subject to a fine under Code of Ordinances § 1-4(a), which caps zoning fines at $2,000 per offense (escalating minimums of $500 and $1,000 for repeat convictions within 48 months), with each day of noncompliance a separate offense.

Shed & Carport Rules

Plano's zoning code lets homeowners build sheds and other detached accessory structures, but boxes them in: no commercial use or renting, no placement in the required front yard, a minimum 3-foot setback from side and rear lot lines, and a 10-foot height cap once a shed sits in a required rear or side yard, per Zoning Ordinance § 13.900.1.

Key details: Max height (rear/side yard): 10 feet. Min side/rear setback: 3 feet (detached). Setback from main house: 10 feet if enclosed 3+ sides. Front yard placement: Prohibited. Screening required: 6-ft fence if under 10 ft from lot line.

An oversized or misplaced shed is a zoning violation under § 1.700: every day the structure remains out of compliance is a separate offense, fined per City Code § 1-4(a). Code enforcement can require a homeowner to relocate, resize, or remove a shed built inside a front yard, an easement, or a right-of-way, and a missing screening fence around a close-set shed can draw a separate citation.

The Bottom Line

Plano'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 Plano is broadly strict or permissive.

Keep in mind that Plano 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.