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Fort Worth, TX Accessory Structures: ADU Rules (2026)

Some Restrictions

Compiled from the official code textEditor Martyn O'NeillLast verified August 2026

ADU rules in Fort Worth, TX, also called accessory dwelling unit regulations or granny flat ordinances, cover setbacks, owner-occupancy, parking, and permit requirements.

Key Facts

Governing section: Zoning Ordinance § 5.301(a) and (c)
Setbacks: Match primary structure's side/rear setback
Lot coverage: Counts toward district's max rooftop coverage
Height cap: Cannot exceed height of primary residence
Building code: Must meet code for habitable structures

ADU Eligibility Quick-Check

An Accessory Dwelling Unit (ADU) is a smaller, independent living unit on the same lot as a single-family home: converted garages, detached cottages, basement or attic conversions, and attached additions all qualify. Most states have streamlined ADU permitting since 2020, but local rules still control size, height, and setback.

Is your lot zoned single-family or multi-family residential?
Does your lot have at least 1,200 sq ft of buildable space?
Is your existing home owner-occupied (in most states this is not required, but some require it for ADU permits)?
Will the ADU stay under your state's size cap (commonly 850-1,200 sq ft for detached)?
Can you provide one off-street parking space (waived in many states within 0.5 mi of transit)?

If you answered 'yes' to most of these, you likely qualify in Texas under recent ADU streamlining laws. The Fort Worth, TX rules below cover local size, height, and setback requirements.

Summary

An accessory dwelling unit in Fort Worth is a habitable accessory structure under Zoning Ordinance § 5.301, and it has to clear three hurdles before anyone can move in: the same side and rear setback and lot-coverage limits that apply to every accessory building, the City's building code for habitable space, and a height cap that never exceeds the primary house.

(a) General provisions. ... (2) Accessory buildings shall comply with the side and rear setbacks for the primary structure of the zoning district applicable to the residential use. (3) The total area covered by all rooftops shall not exceed the maximum lot coverage (percentage) for the district applicable to residential use. ... (c) Habitable accessory structures. In addition to the requirements set out in subsection (a) above, habitable accessory buildings must comply with the following requirements: (1) Must meet all applicable City of Fort Worth building code for habitable structures; (2) May not exceed the height of the primary; and ...

Source: Fort Worth Zoning Ordinance §5.301 (Accessory Uses on Residential Lots)View official code

Full Breakdown

301 sets the standards for accessory buildings on residential lots in Fort Worth's one-family districts, and subsection (c) adds extra requirements once that structure is habitable, meaning it has living space rather than just storage. ' A structure connected to the house by a breezeway or covered walkway is not treated as an extension of the primary home for these purposes. 301(c) requires a habitable accessory structure, the category a garage apartment or ADU falls into, to meet 'all applicable City of Fort Worth building code for habitable structures' and to stay at or below the height of the primary residence.

301(a)(5). 300(f) or the building-permit requirement in the Building Administrative Code, both of which apply to any accessory structure regardless of whether it is habitable.

Violations & Fines

Building a habitable accessory structure that exceeds the primary home's height, sits inside the required setback, or pushes the lot past its coverage cap is a zoning violation Code Compliance can order corrected, including removal of the noncompliant portion. Occupying the unit before it passes building-code inspection for habitable space under § 5.301(c)(1) can also draw a certificate-of-occupancy hold.

Frequently Asked Questions

What setback applies to a Fort Worth ADU?

The same side and rear setbacks that apply to the primary structure in that zoning district, under § 5.301(a)(2). The ordinance does not give habitable accessory structures a separate, more lenient setback: they are held to the primary home's dimensional standards for the district.

How tall can a garage apartment be in Fort Worth?

No taller than the primary residence. Section 5.301(c)(2) caps a habitable accessory structure's height at the height of the primary home, a stricter limit than the ten-to-twelve-foot cap that applies to non-habitable sheds and storage buildings under § 5.301(b)(1).

Does an ADU count against my lot coverage limit?

Yes. Section 5.301(a)(3) states that the total area covered by all rooftops shall not exceed the maximum lot coverage percentage for the district, and that cap is cumulative across the primary home and every accessory structure, including a habitable ADU.

Sources & Official References

[1]Fort Worth Zoning Ordinance § 5.301, American Legal Publishing

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All Fort Worth rules

How Fort Worth compares: Easiest Cities to Build an ADU·Texas rules heatmap·Compare Fort Worth to another location·View the Texas accessory structures overview

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