What Are You Building in Decatur?

​

1-Car, 2-Car Garage | ADU | Backyard Studio | Workshop | Garage Conversion

​

Decatur's residential lots average 0.1 to 0.4 acres. Many carry significant existing impervious coverage from original homes, driveways, patios, and walkways. The 40 percent impervious surface limit means that on a developed 0.2-acre lot, the available margin for a new garage or studio footprint may be tighter than expected. Garages for Atlanta calculates this margin at the first site visit, before a footprint is proposed. For homeowners at or near the coverage limit, a garage conversion — which adds no new impervious surface — is always the first option worth evaluating.

​

Detached Garage Construction in Decatur

​

A detached garage in Decatur requires three pre-permit steps that do not exist in most other Metro Atlanta cities: an impervious surface calculation confirming the footprint fits within the 40 percent limit, an arborist pre-application meeting (treepermits@decaturga.com) if any trees or root zones are affected, and a check for historic district applicability. Garages for Atlanta handles all three as part of the site evaluation before any design is drawn. The permit application is then submitted through the communitycore.com portal with full architectural drawings, the site plan with all required calculations, and any tree documentation from the arborist process.

​

• Impervious surface calculation completed at site visit before any footprint is committed to design

• Arborist pre-application meeting at treepermits@decaturga.com arranged by GFA if tree disturbance is involved

• Historic district check at first consultation — Clairemont, MAK, and Agnes Scott College districts all assessed

• communitycore.com permit submission managed by GFA through final inspection

• Exterior finish matched to Decatur's 1970s-1990s housing stock profile

Attached Garage Addition in Decatur

​

An attached garage addition in Decatur requires an Additions and Alterations Permit from the City — a different permit type than the Accessory Structure Permit required for detached builds. The same impervious surface calculation applies because the addition's footprint is included in the lot's total coverage. The arborist pre-application meeting is required if the addition's footprint or its excavation affects any protected tree's root zone. For historic district properties, an Additions and Alterations application also triggers review against Decatur's historic preservation guidelines.

​

• Additions and Alterations Permit (different from Accessory Structure Permit for detached builds)

• Impervious surface calculation includes the addition footprint — calculated before design is committed

• Roofline tie-in to the existing home resolved at concept design stage

• Historic district design compatibility confirmed before permit drawings are finalized

ADU Construction in Decatur

​

Decatur has allowed ADUs since December 2012 and permits them across a broader range of residential districts than the City of Atlanta. Units are capped at 800 square feet or 40 percent of the primary dwelling's size, whichever is smaller. Detached ADUs must be in the rear yard and cannot occupy more than 30 percent of the backyard's area. The combined footprint of the primary home and ADU cannot exceed 40 percent of the total lot. Decatur's owner-occupancy requirement — the owner must occupy either the primary home or the ADU for at least eight months annually — is distinct from Atlanta's rules and must be understood before building for rental purposes.

​

Garages for Atlanta manages Decatur's ADU permit pathway including the arborist pre-application process, Tree Conservation Plan if required, and the Additions and Alterations or Accessory Structure permit pathway depending on ADU configuration.

​

• 800 sf cap or 40% of primary dwelling, whichever is smaller

• Owner must occupy primary home or ADU for at least 8 months per year

• Detached ADU must be in rear yard, not more than 30% of backyard area

• Combined lot coverage (home + ADU) cannot exceed 40% of total lot area

• Arborist meeting and full Tree Conservation Plan submitted with permit application

Backyard Studio and Workshop in Decatur

​

Decatur's highly educated, creatively concentrated homeowner base drives consistent demand for backyard studios and professional workspaces. The same impervious surface rules and arborist pre-application requirements that govern garage permits apply to backyard studios. For the city's artists, musicians, academics, therapists, and remote professionals, a purpose-built studio with the right electrical service, acoustic insulation, and climate control is not a luxury — it is functional infrastructure. Garages for Atlanta designs every Decatur studio around the homeowner's actual professional use case, with electrical panel specifications, acoustic wall assemblies, and HVAC selections that match what the space will actually do.

​

• Accessory Structure Permit with Tree Conservation Plan and site plan including all required calculations

• Use-case-specific electrical: 240V kiln circuits, recording studio acoustic spec, yoga studio HVAC

• Impervious surface margin calculated before any footprint is proposed

• Garage conversion to studio: no new impervious surface, fastest permit pathwa

Garage Conversion in Decatur

​

The garage conversion is the most cost-efficient path to additional space in Decatur for one specific reason: it adds zero new impervious surface. For homeowners whose lots are already close to the 40 percent coverage limit, a conversion of an existing garage to a studio, home office, in-law suite, or ADU is the only option that does not require a variance or footprint reduction. Garages for Atlanta's conversion service manages the Additions and Alterations Permit, insulation upgrade to current energy code, electrical upgrade, HVAC installation, and any egress modifications required for the intended use.