R-90 Residential, one-family detached in Montgomery County
Applies to district codes matching R-?90.
Rules last checked by a person on October 20, 2026. Guidance only; confirm with Montgomery County before you build.
Shed
| Location | Rear yard only, at least 60 ft from the front line |
|---|---|
| Side setback | 5 ft |
| Rear setback | 5 ft |
| Height | 20 ft to the highest point |
| Long or tall structures | +2 ft of setback per 2 ft of length over 24 ft, and per 1 ft of height over 15 ft |
| Lot coverage | 30% including accessory buildings (lower for infill lots) |
Garage
| Location | Rear yard only, at least 60 ft from the front line |
|---|---|
| Side setback | 5 ft |
| Rear setback | 5 ft |
| Height | 20 ft to the highest point |
| Footprint | 50% of the house footprint or 600 sq ft, whichever is greater |