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Leander, TX Accessory Structures: ADU Rules (2026)

Some Restrictions

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

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

Key Facts

Living area: 400-900 sq ft
Max height: 2 stories / 30 ft
Units per lot: One ADU maximum
Occupancy rule: Owner must occupy one unit

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 Leander, TX rules below cover local size, height, and setback requirements.

Summary

Leander allows one accessory dwelling per residential lot, sized between 400 and 900 square feet, with an owner-occupancy requirement.

(6)Accessory dwellings shall contain a minimum of 400 square feet of living area and a maximum of 900 square feet of living area or 40% of the gross living area of the primary dwelling, whichever is greater.(7)Either the principal or accessory dwelling unit shall be owner occupied.(b)Maximum height of an accessory dwelling unit shall be two (2) stories or thirty (30) feet.(c)No more than one accessory dwelling unit per lot is allowed in a residential or industrial district.

View official code

Full Breakdown

Article IV, Sec. 6 of the zoning ordinance lets a residential lot add one accessory dwelling, built with a building permit and out of materials matching the main house, either integrated with the primary structure or set to its rear. Living area must run between 400 and 900 square feet, or up to 40% of the primary home's gross living area if that figure is larger, and height tops out at two stories or 30 feet. The unit can't be sold separately, can't exist without the primary structure, and either the principal or the accessory dwelling must be owner-occupied. Each ADU also needs its own water and sewer tap and counts toward the lot's LUE allocation.

Violations & Fines

Building an ADU before the primary residence, exceeding the size or height caps, or having neither unit owner-occupied violates the standard and can hold up a certificate of occupancy.

Frequently Asked Questions

Can I rent out my ADU separately from the main house in Leander?

The unit can't be sold separately, and either the primary home or the ADU must be owner-occupied under Art. IV, Sec. 6.

How big can an accessory dwelling be in Leander?

Between 400 and 900 square feet, or up to 40% of the main home's living area if that's larger.

Sources & Official References

[1]Leander, TX Code of Ordinances (Municode)

Other rules in Leander

Noise Ordinances: Quiet HoursSome Restrictions Shed & Carport RulesSome Restrictions Noise Ordinances: Barking DogsSome Restrictions Parking Rules: Towing & Impound RightsHeavy Restrictions Fence Regulations: Material RestrictionsSome Restrictions Fence Regulations: Fence Permit RequirementsSome Restrictions Fence Regulations: Retaining WallsSome Restrictions

All Leander rules

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

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