Denton's Accessory Structures: The Rules That Matter

Every city handles accessory structures a little differently. In Denton, Texas, there are 9 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

Denton allows ADUs in certain residential zones under its Development Code. Units must be subordinate to the primary dwelling, meet setbacks, and cannot be sold separately. Owner occupancy is typically required.

Key details: Max Size: Generally 800 sq ft or percentage of primary. Setbacks: Same as accessory structures (typically 5 ft). Parking: One additional off-street space required. Owner Occupancy: Typically required in one unit. Separate Sale: Not permitted.

Constructing an ADU without a building permit or in violation of zoning standards can result in stop-work orders and fines up to $500 per day. Unpermitted ADUs may be required to be brought into compliance or removed.

Tiny Homes

Denton regulates tiny homes by type. Foundation-built units must meet IRC and zoning minimums. Tiny homes on wheels are classified as RVs and cannot be used as permanent dwellings.

Key details: On Foundation: Treated as conventional dwelling or ADU. On Wheels: Classified as RV, not for permanent occupancy. Minimum Size: Must meet zoning district minimum. Ceiling Height: 7 feet minimum. Permit: Required for all foundation-built tiny homes.

Using a tiny home on wheels as a permanent residence in a residential zone can result in zoning violations with fines up to $500 per day. Building a foundation-based tiny home without a permit results in the same penalties as any unpermitted construction.

Garage Conversions

Garage conversions in Denton require a building permit. The converted space must meet egress, ventilation, and ceiling height standards. Replacement off-street parking must be provided on-site.

Key details: Permit Required: Yes, building permit mandatory. Parking: Must replace off-street spaces or get variance. Ceiling Height: 7 feet minimum. Egress: Emergency egress windows in bedrooms. Fine: Up to $500 per day for unpermitted work.

Unpermitted garage conversions can result in fines up to $500 per day and a requirement to restore the garage to its original condition or obtain a retroactive permit with all required inspections.

Carport Rules

Denton permits carports in residential zones. They cannot extend into front setbacks or the right-of-way. Attached carports and detached carports over 120 sq ft require a building permit.

Key details: Permit Threshold: Required if attached or over 120 sq ft. Setbacks: Must comply with zoning district requirements. Front Yard: Cannot extend into front setback. Lot Coverage: Counts toward district maximum. Foundation: Anchored slab required for permitted carports.

Carports built without required permits or in violation of setbacks may receive code enforcement citations with fines up to $500 per day. The city may require relocation or removal of non-compliant carports.

Denton is more permissive than most cities when it comes to carport rules. That said, there are still limits.

Shed Rules

Denton allows sheds in residential yards. Sheds under 120 sq ft generally need no permit but must meet setbacks. Larger sheds require a permit and count toward lot coverage limits.

Key details: Permit Exempt: Under 120 sq ft, one story. Setbacks: Typically 5 ft from side and rear lines. Front Yard: Sheds not permitted in front yard. Height Limit: Cannot exceed primary dwelling height. Lot Coverage: Counts toward zoning district maximum.

Sheds placed in violation of setback requirements or exceeding size limits without a permit may receive code enforcement citations with fines up to $500 per day. The city may require relocation or removal of non-compliant structures.

Denton is more permissive than most cities when it comes to shed rules. That said, there are still limits.

ADU Owner Occupancy

Denton's Development Code does not impose a citywide owner-occupancy requirement for the by-right first ADU on a lot. However, the January 2026 amendment requiring a Special Use Permit (SUP) for any second ADU enables City Council to attach owner-occupancy and other conditions case-by-case. Texas has not preempted local owner-occupancy rules for ADUs (unlike California). University of North Texas-area properties face heightened scrutiny.

Key details: City Owner Occupancy: Not required for first by-right ADU. Second ADU SUP: May impose owner occupancy. Recording Office: Denton County Clerk. State Preemption: None (TX has no ADU preemption). Near UNT/TWU: Heightened rental scrutiny.

Operating an ADU in violation of an SUP condition (when an SUP is required) is a code enforcement matter. The city may revoke the SUP and Certificate of Occupancy. Fines up to $500 per day apply under Texas Local Government Code § 54.001. False statements on permit applications can void the permit and trigger Class C misdemeanor charges.

ADU Impact Fees

Denton charges standard water, wastewater, and roadway impact fees on new dwelling units under authority of Texas Local Government Code Chapter 395. Updated Roadway Impact Fees took effect January 1, 2025. Water/wastewater impact fee updates were considered in August 2025. ADUs sharing the primary dwelling's water and sewer service avoid most impact fees because separate water or sewer service for the ADU is not allowed under the Denton Development Code.

Key details: Authority: TX Local Gov Code Ch. 395. Roadway Impact Fees: Updated effective Jan 1, 2025. Water/Sewer Tap: Must share primary (no separate tap). Utility Provider: Denton Municipal Electric (DME). Gas Provider: Atmos Energy.

Failure to pay impact fees results in permit denial or revocation. Building or occupying an ADU on an unauthorized utility connection violates the Denton Development Code and the adopted plumbing code. Texas Local Government Code § 54.001 authorizes civil penalties up to $500 per day for zoning violations and $2,000 per day for building/fire violations.

ADU Permits

Denton allows one accessory dwelling unit (ADU) by right on lots with a single-family detached dwelling, townhome, duplex, or triplex under the Denton Development Code (DDC). Maximum ADU size is the greater of 800 sq ft or 75% of the primary dwelling. A January 2026 amendment requires a Special Use Permit (SUP) for any second ADU on the same lot. Permits are obtained through Development Services at 401 N Elm St.

Key details: Code Section: DDC Subch. 5 & 12 (§ 35.12.4). First ADU: By right (1 per lot). Second ADU: SUP required (2026 amendment). Max Size: 800 sq ft or 75% of primary (greater). Setbacks: 3 ft rear/side, behind front building line.

Building an ADU without a permit, or a second ADU without an SUP, is a Class C misdemeanor under Denton Code with fines up to $2,000 per day for building/fire code violations and $500 per day for zoning violations under Texas Local Government Code § 54.001. The city may order removal and place a lien for abatement costs.

ADU Rental Restrictions

Denton ADUs may be rented long-term (30+ days) under the Denton Development Code without owner-occupancy on the first by-right unit. Short-term rentals (24 hours to 29 days) require STR Registration with the City of Denton ($100 annually). Effective January 1, 2025, amended STR rules impose additional requirements in residential and multifamily zones, with a citywide cap of 1,000 STR certificates per calendar year.

Key details: Long-Term (30+ days): Permitted, no owner-occupancy needed. STR Definition: 24 hours to 29 days. STR Registration Fee: $100 annual. Citywide STR Cap: 1,000 certificates per year. Effective Date (2025 rules): January 1, 2025.

Operating an unregistered STR is a Class C misdemeanor with fines up to $500 per day under Texas Local Government Code § 54.001. Failure to remit Hotel Occupancy Tax can trigger Texas Comptroller audit and penalties. Denton uses listing-monitoring services to detect unregistered STRs on Airbnb, VRBO, and similar platforms.

This is one of the stricter rules in Denton's municipal code. If you are unsure whether your situation complies, it is worth checking with the city before proceeding.

The Bottom Line

Compared to many U.S. cities, Denton gives residents more room on accessory structures. 2 of the 9 rules here are rated permissive. But permissive does not mean unregulated. There are still requirements, and the city does enforce them when violations are reported.

Keep in mind that Denton 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.