Accessory Structures in Frisco, TX: What Residents Actually Need to Know

If you live in Frisco or are thinking about moving there, accessory structures are one of those things you probably won't think about until they affect you directly. Frisco has 5 specific rules on the books covering different aspects of accessory structures, and some of them might surprise you.

ADU Owner Occupancy

Frisco lets a homeowner rent out a garage apartment or guest house, but only while the main house stays owner-occupied. Section 4.06.03(C)(2) of the zoning ordinance conditions any rental of the accessory unit on that owner-occupancy status, closing off renting out both the main dwelling and the accessory unit as two separate rentals at once.

Key details: Rental condition: Main dwelling must be owner-occupied to rent unit. Governing section: Zoning Ordinance § 4.06.03(C)(2). Companion rule: Cannot be sold apart from main home, (C)(1). Construction rule: Building Permit required, § 4.06.03(B). Penalty: Up to $2,000/day, § 1-12.

Renting a garage apartment or guest house while the main dwelling sits vacant or is itself rented to a different tenant violates Section 4.06.03(C)(2). Because the zoning ordinance does not set a unique penalty for this subsection, it falls under the Code's general penalty, Section 1-12, which fines zoning violations up to $2,000.00, with each day the noncompliant rental continues counted as a separate offense.

Garage Conversions

Frisco's zoning ordinance requires two enclosed garage parking spaces on lots in the RE, SF-16, SF-12.5, SF-10, SF-8.5, SF-7, OTR, PH, 2F and TH districts, so converting an attached garage into a bedroom, office or den without replacing that enclosed parking violates Section 4.04.02(E)(1). The required spaces must also stay clear of encroachments under Section 4.04.02(F)(2).

Key details: Minimum enclosed spaces: Two enclosed garage parking spaces required. Districts covered: RE, SF-16, SF-12.5, SF-10, SF-8.5, SF-7, OTR, PH, 2F, TH. Space dimensions: 9 feet wide by 20 feet long minimum. Stacking spaces: Two paved spaces required behind front property line. Max fine: $2,000 per day, Section 1-12.

Converting a required garage without replacing the enclosed spaces is a zoning ordinance violation. Frisco's general penalty section, Section 1-12, punishes violations of any provision that governs or regulates fire, safety, zoning, public health or sanitation with a fine not exceeding $2,000.00, and each day an offense continues is a separate offense. Code Enforcement can also require the conversion be reversed or a compliant garage rebuilt before a certificate of occupancy issues.

ADU Rental Restrictions

Frisco allows a garage apartment or guest house on the same lot as the main dwelling, but Section 4.06.03(C)(1) locks the accessory unit to the property: it may not be sold separately from the sale of the entire property, including the main dwelling unit. A homeowner cannot subdivide title, condo the unit, or sell just the accessory dwelling and keep the house.

Key details: Sale restriction: Guest house/garage apartment cannot be sold apart from main home. Governing section: Zoning Ordinance § 4.06.03(C)(1). Companion rule: Owner occupancy required to rent under (C)(2). Permit needed: Building Permit required under § 4.06.03(B). Penalty: Up to $2,000/day, § 1-12.

Attempting to sell a garage apartment or guest house apart from the main dwelling is not a recordable conveyance under Frisco's zoning ordinance, and the city can refuse to process a plat or replat that would split the lot for that purpose. A violation of Section 4.06.03 falls under the Code's general penalty, Section 1-12, which fines zoning violations up to $2,000.00 per day, with each day of continued violation a separate offense.

Shed & Carport Rules

Frisco's Zoning Ordinance bars accessory structures, including sheds, from commercial use in residential districts under Section 4.06.01 and keeps them out of every easement under Section 4.06.04(B). A shed built in the rear portion of a lot must sit at least 10 feet from the main house or match the house's rear setback, though alley-loaded lots get a 3-foot rear setback for sheds no taller than 8 feet.

Key details: Easement placement: Prohibited in any easement. Rear setback (general): 10 feet or match main house. Alley-lot exception: 3-foot rear setback if 8 feet tall or less. MH District side/rear setback: 10 feet minimum. Commercial use: Barred in residential districts.

A shed built inside an easement, inside the required rear or side setback, or without an accessory-structure permit violates Sections 4.06.01 and 4.06.04 and is punished under the Zoning Ordinance's general penalty clause, Section 8.01.02: a fine of $200 to $2,000, with each day the shed remains noncompliant counted as a separate offense and the minimum fine doubling on a second conviction inside 24 months.

ADU Rules

Frisco's Zoning Ordinance allows a Garage Apartment or Guest House as an incidental residential use under Section 4.06.03, but only with a Building Permit, only if it isn't sold separately from the main house, and only rented while the primary dwelling stays owner-occupied. Setbacks track the same accessory-structure table used for sheds and patio covers.

Key details: Permit required: Building Permit before construction. Rental condition: Main house must stay owner-occupied. Resale rule: Cannot be sold apart from main house. Garage Apartment location: Attached to garage, above or level. Guest House location: Must be separate from main dwelling.

Building a Garage Apartment or Guest House without the required Building Permit, or renting it out after the main house is no longer owner-occupied, violates Section 4.06.03 and is enforced under the Zoning Ordinance's general penalty clause, Section 8.01.02: a fine of $200 to $2,000 per offense, with each day of continued noncompliance counted separately and the minimum fine doubling on a second conviction within 24 months.

The Bottom Line

Frisco'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 Frisco is broadly strict or permissive.

Keep in mind that Frisco 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.