Everything homeowners ask about building an ADU in Fort Worth — answered with 2026 data.
Yes. Fort Worth requires a building permit for every accessory dwelling unit, and a site plan showing the unit's footprint, setbacks and lot coverage. Permits go through Fort Worth Development Services (817-392-2222). Texas has no statewide by-right ADU law, so the city's local rules under Zoning Ordinance §5.301 and the §9.101 definition apply.
Building a detached guest unit in Fort Worth typically costs $130,000-$320,000 for new construction, or about $250-$400 per square foot. A garage conversion is the most affordable route at $30,000-$100,000, and a prefab/modular unit runs $150,000-$300,000. Budget the building permit ($300-$900 for a typical unit) and, if you add a separate water meter, the connection charges described in the permits section. See our full Fort Worth ADU cost guide for a line-item breakdown.
There is no square-footage cap. The unit is limited by your district's lot coverage counting every roofed structure (50% in A-5, 45% in A-7.5, 40% in A-10, 30% in A-21 and A-43), the district's side and rear setbacks (5 ft in A-5 and A-7.5, 10 ft in A-10 and A-21, 25 ft in A-43) and a height no greater than the main house.
No. Under Zoning Ordinance §9.101 an accessory dwelling unit may not be rented or leased and may not contain cooking equipment; it is for members of the household or temporary guests of 14 days or fewer in any 30. A self-contained rentable second unit is by right only on a lot zoned 'B' Two-Family (§4.707, §6.502) or in certain planned-development and form-based districts; on an 'A' lot it requires a rezoning. Short-term rental is not a permitted use in any residential district.
Use a licensed contractor experienced with Fort Worth's permit process, §5.301 zoning, and utility connections — not every general contractor has built an accessory unit. We match Fort Worth homeowners with local ADU builders for free, no-obligation quotes; getting at least three bids usually saves 20-40% on the same scope. Find Fort Worth ADU builders here, or if you are a builder, get matched with local ADU leads.
Detached ADUs in Fort Worth can be up to No numeric cap for a habitable accessory building in § 5.301. The limits are the district's lot coverage counting every roof on the lot. Attached ADUs are limited to Not a separate category. Living space attached to the house is an addition to the one-family dwelling and follows the district's setbacks, lot coverage and 35-ft height; in an 'A' district it cannot be a second dwelling unit or be leased separately. Two attached units on one lot are allowed only in 'B' Two-Family. Junior ADUs (JADUs) have a cap of Not a category in Fort Worth zoning. A suite inside the house with its own entrance is simply part of the one-family dwelling; a room rented to an unrelated roomer or lodger may not be used for cooking (§ 9.101 'roomer or lodger'). Maximum height is May not exceed the height of the primary residence (§ 5.301(c)(2)); the district cap is 35 ft in every 'A' and 'B' district (§§ 4.700-4.707), measured under § 6.100. The 10-ft limit (12 ft with 2 ft of extra setback per foot) in § 5.301(b)(1)(d) applies to non-habitable accessory buildings only. You are allowed up to One accessory dwelling unit per one-family lot in practice: it must be accessory to the single main dwelling, and a second independent residence is barred in the 'A' districts on a qualifying lot.
Rear setback: 5 ft in A-5, A-7.5 and AR; 10 ft in A-10 and A-21; 25 ft in A-43 and A-2.5A. A habitable accessory building must meet the side and rear setback of the primary structure for its district (§ 5.301(a)(2)). The 3-ft reduction in § 4.705(d)(8) is for detached garages behind the rear wall of the house, not habitable space, and structures may not sit in easements. Side setback: 5 ft interior side in A-5, A-7.5 and A-10 (10 ft on the street side of a corner lot); 10 ft in A-21; 25 ft in A-43 and A-2.5A; AR is a zero-lot-line district (10 ft on one side, 0 ft on the other, § 4.706). Same rule: the accessory building keeps the district side setback of the main house (§ 5.301(a)(2)). Front setback: Not allowed in the front yard (city Residential Accessory Building packet, citing § 5.300(b)); non-habitable accessory buildings must sit behind the rear wall of the house or at least 75 ft from the front property line (§ 5.301(b)(1)(c)). Otherwise the district front setback applies: 20 ft in A-5, A-7.5 and AR (15 ft on a limited local street), 25 ft in A-10, 30 ft in A-21, 35 ft in A-43. Note that garage conversions may be exempt from setback requirements if the existing structure is already within the setback area.
No separate parking requirement for an accessory dwelling unit: § 6.201 lists only 'residential unit, one-family up to four family: 1 to 4 spaces per dwelling unit, see individual districts', and the accessory unit is not a dwelling unit. The house keeps its district parking (A-5, A-7.5, A-10, A-21: two spaces behind the front building wall for up to three bedrooms plus one per additional bedroom, § 4.705(d)(2); AR: two per unit, four on a limited local street, § 4.706(d)(2)). Enclosing a garage that holds required spaces can require a Board of Adjustment variance (city Residential Permitting page). Many cities and states have been relaxing ADU parking requirements in recent years. In California, no additional parking is required for ADUs near transit.
No owner-occupancy clause, but the occupancy rule is stricter: the unit may be occupied only by a member of the family living in the main dwelling or by temporary, non-paying guests staying no more than 14 days in any 30 (§ 9.101 'dwelling unit, accessory' and 'temporary guest'), and it may not be rented or leased. Roomer or lodger rentals of a room are a separate definition and exclude cooking. Note that owner-occupancy rules vary by state law — California and several other states have eliminated this requirement for standard ADUs.
The ADU permit review timeline in Fort Worth is typically City-published first-review target for a residential building permit: 7 business days from a complete application (Review Timeframes page, 2026); urban forestry review 7 business days; a zoning variance about 1.5 months; a PD rezoning about 3 months from the monthly application deadline. The city publishes no end-to-end permit figure; total time depends on correction rounds. Plan check: Included in the building permit fee; first comments in 7 business days. Each revision round is billed per hour (FY2027: $66.15 first, $119 second, $237 third and fourth, $375 fifth and up). Expedited review costs a $500 application fee plus $1,125 per hour. Third-party plan review is allowed and cuts the permit fee to 70% (55% for third-party inspections, 35% for both). Pre-approved plans availability: None. The city's Housing Affordability Strategy funds a neighborhood pattern book of pre-approved designs, including ADUs, through a $5 million HUD PRO Housing grant; the design RFP was expected in September 2026 (Community Development Committee briefing, Sept 15, 2026). Strategy 4, 'Encourage Accessory Dwelling Units', is listed but had no update at that briefing.
Average ADU rental income in Fort Worth: 1-bedroom units rent for $1,250-$1,500/month, 2-bedroom units for $1,550-$1,750/month. Short-term rentals: No. Expected ROI: None on a one-family lot: the unit cannot be leased. A second detached unit on a 'B' lot renting at $1,250-$1,750/mo on a $130,000-$320,000 build is a 5-12% gross yield before taxes, vacancy and financing.
The minimum lot size for an ADU in Fort Worth is No separate minimum for the accessory unit; the lot must meet its district minimum (3,500 sq ft AR; 5,000 sq ft A-5 and B; 7,500 sq ft A-7.5; 10,000 sq ft A-10; 21,780 sq ft A-21; 1 acre A-43; 2.5 acres A-2.5A) or qualify as a nonconforming lot of record (§ 7.106). The 2026 'Small Lot Housing' use (LGC ch. 211 subch. D; ZC-25-171, Council May 12, 2026) lets new subdivisions of 5 acres or more plat lots down to 3,000 sq ft but adds no ADU right. This applies to detached ADUs — garage conversions and JADUs may have different or no lot size requirements.
Garage conversions are one of the most popular and affordable ADU options. In Fort Worth, a garage conversion typically costs $30,000-$100,000. The key advantages are lower cost (no foundation work), potential setback exemptions, and faster permitting. Read our complete garage conversion guide.
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