Garage Conversions: Alpharetta vs Roswell
How do garage conversions rules compare between Alpharetta, GA and Roswell, GA?
Roswell has fewer restrictions than Alpharetta.
Alpharetta, GA
Fulton County
Converting a garage to habitable space in Fulton County requires a building permit, plan review, electrical/plumbing/mechanical permits, and compliance with IRC habitable-space requirements. Off-street parking must be replaced.
View full Alpharetta rules →Roswell, GA
Fulton County
Converting a garage to habitable space (bedroom, office, ADU) in Roswell requires a building permit, must meet residential energy code (insulation, windows, mechanical), and may require additional off-street parking to replace the converted spaces. ADU conversions are subject to the same UDC zoning rules as new ADUs.
View full Roswell rules →Key Facts Comparison
| Fact | Alpharetta | Roswell |
|---|---|---|
| IRC ceiling height | 7 ft min | - |
| Parking | Must be replaced | - |
| ADU rules if separate | 750 sq ft max | - |
| Permit | - | Required |
| Egress | - | IRC §R310 required |
| Parking Replacement | - | Often required |
| Energy Code | - | Must meet residential standards |
| ADU Use | - | Subject to UDC ADU rules |
Highlighted rows indicate differences between cities.
Alpharetta FAQ
Can I convert without a permit?
No — it triggers structural, electrical, and mechanical permits.
Do I lose required parking?
You must replace it elsewhere on-site.
Roswell FAQ
Do I need a permit to convert my garage to a bedroom in Roswell?
Yes. Building permit, electrical permit, and possibly mechanical permit are required. The space must meet residential energy code, egress, and ceiling-height requirements.
Will I lose required parking if I convert my garage?
Possibly. The UDC requires 2 off-street parking spaces per dwelling. If your driveway can accommodate the replacement spaces you may be fine; otherwise you may need to add parking elsewhere on the lot.
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