Grading & Drainage: Duluth vs Suwanee
How do grading & drainage rules compare between Duluth, GA and Suwanee, GA?
Duluth and Suwanee have similar restriction levels.
Duluth, GA
Gwinnett County
Grading permits required for significant earthwork. Drainage must not be redirected onto adjacent properties. Duluth enforces Gwinnett County Stormwater Management standards.
View full Duluth rules →Suwanee, GA
Gwinnett County
Grading and drainage reviewed under Suwanee Code Ch. 34 and IBC/IRC adopted by reference. Grading permit issued with building permit or land disturbance permit. Positive drainage away from structures (6 inches in first 10 feet) required.
View full Suwanee rules →Key Facts Comparison
| Fact | Duluth | Suwanee |
|---|---|---|
| Permit | Tied to building/land disturbance permit | - |
| Retaining Wall | Engineered if over 4 ft | - |
| Slope | 6 in/10 ft from structures | 6 in. / 10 ft away |
| Discharge | Cannot redirect onto neighbors | - |
| Code | - | Ch. 34; IRC R401.3 |
| Design | - | GA Blue Book |
| Threshold | - | >5,000 sf |
Highlighted rows indicate differences between cities.
Duluth FAQ
Can my neighbor regrade their yard so water flows onto mine?
No. Altering drainage to damage adjacent property creates civil liability and can trigger city enforcement. Document with photos and contact Planning & Development.
Do I need engineered plans for a retaining wall in Duluth?
Yes if the wall is over 4 feet tall or carries a surcharge (driveway, pool, or structure above). Engineering is required at any height with surcharge.
How far should finished grade slope away from my Duluth home?
Six inches of fall in the first 10 feet from the foundation. This is required to prevent water intrusion and erosion.
Suwanee FAQ
Can I regrade my yard?
Minor regrading that doesn't alter drainage patterns or exceed 5,000 sf typically doesn't need a permit. Check with Suwanee Planning first.
How much slope does Suwanee require away from my house?
Per IRC R401.3, at least 6 inches of fall in the first 10 feet away from the foundation.
Do I need a grading plan for a home addition?
Yes, if disturbed area exceeds 5,000 sq ft. Plans must show contours, drainage patterns, and BMPs per the GA Blue Book.
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