Decatur, AL Building Setbacks & Zoning: Setback Rules (2026)
Key Facts
- R-1 setbacks
- 40 feet front, 45 rear, 15 sides
- R-2 setbacks
- 35 feet front, 40 rear, 8 sides
- R-3 setbacks
- 30 feet front, 35 rear, sides 8 and 6
- Corner lot, back-to-back layout
- 15-foot side street yard
- Neighbor averaging
- Average of residences within 100 feet each side
- Accessory structure setback
- 5 feet rear and side
Summary
In the City of Decatur, Alabama, every structure must provide the yard its district specifies, and Sec. 25-14 adds rules for corner lots and neighbor averaging. R-1 requires 40 feet front, 45 feet rear and 15 feet on the sides, while a corner lot with a back-to-back layout needs a 15-foot side street yard.
In each district each structure erected or altered after June 3, 1958, shall be provided with the yard specified, and shall be on a lot of the area and width specified in sections 25-10 through 25-12, except as herein otherwise provided. No open space or lot required for a building or structure shall during its life be occupied by or counted as open space for another building or structure. In all residential districts where a lot is located at the intersection of any two streets and where the lots are arranged so as to allow houses to face both streets, there shall be a setback requirement on both streets equal to the front yard setback. Where building lots are back to back in an arrangement which will not allow for houses to face the side street, there shall be a minimum side yard requirement on the side street of fifteen (15) feet. ... (c)No dwelling need be set back more than the average of the setbacks of the existing residences within one hundred (100) feet each side thereof.
Full Breakdown
Yard setbacks in the City of Decatur, Alabama are set district by district in Sec. 25-10 through Sec. 25-12, and Sec. 25-14 supplies the rules that apply across them. Every structure erected or altered after June 3, 1958 must provide the specified yard, and no open space required for one building can count as open space for another.
Corner lots get their own rule. Where houses can face both streets, the setback on both streets equals the front yard setback. Where lots back up to each other and houses cannot face the side street, the side street yard is at least 15 feet. Sec. 25-14(c) lets a dwelling sit no farther back than the average setback of the existing residences within 100 feet on each side. Under Sec. 25-14(a), a lot of record on June 3, 1958 that is too small to comply is built on as closely as possible to the district standard in the opinion of the board of zoning adjustment, and no side yard can be under 4 feet.
District minimums, front, rear and side: R-1 is 40, 45 and 15 feet (Sec. 25-10.8); R-2 is 35, 40 and 8 (Sec. 25-10.9); R-3 is 30 and 35 with sides of 8 and 6 (Sec. 25-10.10); R-4 is 25 and 30 with sides of 8 and 6 (Sec. 25-10.11); R-5 patio home is 20 and 20 with sides of 5 and 8 (Sec. 25-10.3); R-1E estate is 50, 60 and 25 (Sec. 25-10.7). Public and semi-public buildings in R districts need 35 feet on every side, while accessory structures need 5 feet at the rear and sides (Sec. 25-10). AG-1 uses 20, 45 and 15 (Sec. 25-12.1). Where R-5 lots adjoin a major thoroughfare, an additional 20 feet is added to the front, rear and side setbacks.
Violations & Fines
Sec. 25-6 bars the building inspector from approving plans or issuing a permit until they conform to the chapter, and every application must show the setback and side lines of buildings on adjoining lots. Sec. 25-26 fines a violator not less than $2 and not more than $100 plus court costs per offense, each day a separate offense, and Sec. 25-24 allows injunction or mandamus to abate the violation.
Frequently Asked Questions
How far back must a corner-lot house sit in Decatur?
What are the setbacks for a house in R-1?
Can I build closer to the street if my neighbors are closer?
Do plat setback lines or deed restrictions matter too?
Sources & Official References
Other rules in Decatur
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