General Information

A permit is required for all accessory buildings.

The dimensional regulations in Table 4.06.1 shall apply to all accessory buildings.
a. Exception: The dimensional regulations in Table 4.06.1 shall not apply to accessory buildings associated with agricultural purposes on residential lots.
Accessory buildings are prohibited within easements.
No permit is required for accessory buildings less than 120 square feet in floor area and less than 13 feet in height.

Table 4.06.1. Accessory Building Requirements

Table 4.06.1. Accessory Building Requirements

Requirements for residential accessory buildings.

1. Accessory buildings may only be used as an accessory dwelling unit as permitted by Section 3.03. Permitted Use Chart.
Accessory buildings containing livestock (i.e., chickens, hogs, horses, etc.) shall be located at least 15 feet from any existing dwelling on a neighboring property.
C. Special exceptions for accessory building requirements. The zoning board of adjustment may allow a special exception from the requirements of this section in accordance with Section 6.10. Special Exceptions, based on findings that the placement and size of the proposed accessory building is compatible with the surrounding neighborhood and would not be detrimental to the general health, safety, and welfare of the neighborhood.
Submittal Requirements

Permits may be applied for with the Building Inspection Department at 203 E. Wheatland Road, Duncanville, TX 75116, online through the MyGov.us portal, or email permits@duncanville.com.

The following items must be submitted for review:

Building Permit Application
Two (2) copies of a property survey showing location of the accessory building and setback dimensions to property lines and structures.
Drawing or photo of the accessory structure and materials that will be used to build. Minimum 14-gauge post and 26-gauge roofing is required if using metal material.

Accessory Dwelling Unit must be a minimum 400 square feet.

Structural foundation plans -shall be designed by a Texas State registered engineer. Engineer’s stamp must be affixed to the plan and include certified letter; letter must state - foundation was designed for the soil conditions of the specific lot and that the foundation design criterion complies with the minimum standards required by the 2015 International Residential Code
Energy compliance path form – completed by a third-party energy provider
Engineered shear wall design (must be sealed by PE)
Floor plans with all rooms labeled
Electrical plans indicating the location of smoke and carbon monoxide detectors
Plumbing plans
Elevation drawings showing exterior wall construction.
Window and door sizes

Permit Fee

Accessory buildings 120 square feet in area or smaller:

$50 inspection fee
Accessory buildings greater than 120 square foot area, but 399 square feet or less:
$75 (includes inspection)

Accessory buildings 400 square or greater:

$150 (includes inspection)

Accessory Dwelling Unit

Depends on square feet

Other fees may be required. Email permits@duncanville.com for more information.

Required Inspections

The inspection request line number is (972) 780-5040, option 2. This is an automated line available 24 hours a day

Foundation
Framing, plumbing and/or electrical rough, if necessary
Final Inspection

City of Duncanville

Residential Development Guidelines

Residential Development Guidelines