How Killeen Handles Accessory Structures: A Practical Guide

Killeen maintains 111 local ordinances across all categories, and 9 of those deal specifically with accessory structures. Here is a breakdown of what the city actually requires, what is prohibited, and where Killeen falls on the strict-to-permissive spectrum compared to other cities.

Garage Conversions

Killeen may allow garage conversions with permits. Texas has no statewide garage conversion mandate. Replacement parking may be required.

Key details: Permit: Building permit required. Parking: Replacement usually required. State Law: No TX mandate. HOA: Usually prohibited.

Unpermitted conversion: building code enforcement. Must bring to code or restore. Safety violations: immediate correction.

Shed Rules

Killeen allows small sheds without permits (typically under 120 to 200 sq ft). Larger structures need building permits. Setback requirements apply.

Key details: No Permit: Under 120 to 200 sq ft. Permit: Over threshold. Setbacks: Per zoning code. Habitation: Prohibited.

Unpermitted structure: retroactive permit with penalty. Non-compliant setback: modification or removal.

If you are coming from a city with tighter rules, you will find Killeen gives residents more flexibility on shed rules.

ADU Rules

Killeen regulates accessory dwelling units through zoning. Texas has no statewide ADU mandate. Rules vary significantly by city.

Key details: State Law: No TX mandate. Local Rules: Vary by city. Permit: Building permit required. HOA: Usually prohibited.

Unpermitted ADU: standard building code enforcement. May require demolition or legalization. Occupying unpermitted dwelling: code violation.

Tiny Homes

Killeen regulates tiny homes differently based on whether they are on a permanent foundation or on wheels. Zoning and minimum square footage requirements apply.

Key details: Foundation: Treated as dwelling. On Wheels: RV classification typically. Min Size: 400 to 800 sq ft varies. ADU Path: May allow as secondary.

Unpermitted dwellings: removal or retroactive permitting. Zoning violations: fines and required relocation. Occupancy without certificate: prohibited.

Carport Rules

Killeen requires permits for carport construction. Setback requirements, height limits, and lot coverage maximums apply.

Key details: Permit: Required. Side Setback: 3 to 5 feet typical. Lot Coverage: Counts toward maximum. HOA: May restrict or prohibit.

Unpermitted carports: stop-work orders, required removal or retroactive permitting with penalty fees. Fines $200 to $1,000.

ADU Permits

Killeen regulates accessory dwelling units through its Unified Development Code (UDC) and Chapter 31 (Zoning) of the Code of Ordinances. ADUs are not permitted by right in single-family (SF) districts and typically require a Specific Use Permit (SUP) reviewed by the Planning and Zoning Commission and approved by City Council. Building permits are issued through Killeen Building Inspections after the SUP is granted. Texas has not preempted local discretionary review of ADUs.

Key details: Authority: Killeen UDC + Code Ch. 31 (Zoning). Review Type: Specific Use Permit (discretionary). State Enabling Statute: TX Local Gov Code Ch. 211. Building Code: 2024 IRC (Killeen Code Ch. 8). Typical Timeline: 2-4 months SUP + permit.

Building or occupying an ADU without an approved SUP and building permit is a violation of the Killeen Code of Ordinances enforceable through municipal court citations. Texas Local Government Code § 54.001 authorizes civil penalties up to $1,000 per day for zoning violations affecting public health and safety and $500 per day for general zoning violations. The city may issue stop-work orders, refuse Certificates of Occupancy, and place liens for abatement.

This is not one of those rules that cities tend to ignore. Killeen actively enforces its adu permits requirements.

ADU Impact Fees

Killeen assesses standard water, wastewater, and roadway impact fees on new dwelling units, including ADUs requiring new utility connections, under Texas Local Government Code Chapter 395. Building, plan-check, and trade permit fees are collected by Killeen Building Inspections through the city's permit portal. Texas has no ADU-specific impact-fee waiver; sharing the principal dwelling's water/sewer tap is the most common way to reduce fees.

Key details: Enabling Statute: TX Local Gov Code Ch. 395. Water/Sewer Tap-Share: Avoids most impact fees. Separate Meter ADU: Full impact fees apply. Roadway Impact: Per Ch. 395 Subchapter B. State ADU Waiver: None (Texas).

Failure to pay required impact fees results in permit denial or revocation under Killeen Code Ch. 8 and Texas Local Government Code Ch. 395. Building or occupying an ADU on an unauthorized utility tap is a building and utility-code violation. Texas Local Government Code § 54.001 authorizes civil penalties up to $1,000 per day for health-and-safety zoning violations and $500 per day for general violations.

ADU Rental Restrictions

Killeen ADUs may be rented long-term (30+ days) provided owner-occupancy is maintained per the typical SUP condition under Code Ch. 31. Short-term rentals (under 30 days) are heavily regulated under Killeen Code Sec. 31-953, which requires an annual permit ($200 first year / $100 renewal), $500,000 liability insurance, a 12-person occupancy cap (2 per bedroom + 1), a 200-foot separation between STRs, and 7% city HOT plus 6% state and 2% Bell County HOT (about 15% combined).

Key details: Long-Term (30+ days): Permitted with owner occupancy. STR Code Section: Killeen Code Sec. 31-953. STR Permit Fee: $200 first year / $100 renewal. STR Insurance: $500,000 liability required. Combined HOT: ~15% (7% city + 6% state + 2% county).

Operating an unregistered STR violates Sec. 31-953 and is enforceable through municipal court. Code Enforcement (254-501-7608) handles permit and zoning complaints. Texas Local Government Code § 54.001 supports civil penalties up to $1,000 per day for health-and-safety violations and $500 per day for general zoning. Failure to remit HOT triggers state collection action and penalties (5% / 10% under Tex. Tax Code Ch. 156).

Compared to other cities, Killeen takes a harder line on adu rental restrictions. The enforcement and penalty structure reflects that.

ADU Owner Occupancy

Killeen City Council routinely imposes owner-occupancy as a condition of the Specific Use Permit granted for accessory dwelling units in single-family districts under Chapter 31 (Zoning). The owner must occupy either the principal dwelling or the ADU as a permanent residence, typically secured by a deed restriction recorded with the Bell County Clerk. Texas has not preempted local owner-occupancy rules, and Fort Cavazos PCS turnover makes the requirement particularly relevant in Killeen.

Key details: Authority: Killeen Code Ch. 31 (SUP condition). Owner Occupancy: Required (typical SUP condition). Deed Restriction: Recorded with Bell County Clerk. Military Deployment: Hardship exception possible. Both Units Rented: Prohibited (SF zoning).

Operating an ADU without satisfying owner-occupancy is a Killeen Code of Ordinances violation. The city may revoke the SUP and Certificate of Occupancy and refer the case to municipal court. Texas Local Government Code § 54.001 authorizes civil penalties up to $1,000 per day for health-and-safety zoning violations and $500 per day for general zoning violations. Both units rented to non-owners can trigger a stop-use order.

This is not one of those rules that cities tend to ignore. Killeen actively enforces its adu owner occupancy requirements.

The Bottom Line

Killeen is tougher than many cities when it comes to accessory structures. Out of the 9 rules covered here, 3 are rated strict. If you are a homeowner, renter, or business owner in Killeen, take the time to understand these requirements before they become a problem. Most violations come with fines, and some repeat violations can escalate.

This guide is based on Killeen's current municipal code. Local rules can and do change, so check the individual ordinance pages for the latest details, penalties, and FAQs.