Grading & Drainage: Lawrenceville vs Suwanee
How do grading & drainage rules compare between Lawrenceville, GA and Suwanee, GA?
Lawrenceville and Suwanee have similar restriction levels.
Lawrenceville, GA
Gwinnett County
Grading and drainage reviewed through Lawrenceville Planning & Development. Disturbances over 5,000 sq ft require a grading plan; changes to drainage cannot increase runoff to neighbors.
View full Lawrenceville 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 | Lawrenceville | Suwanee |
|---|---|---|
| Plan Trigger | 5,000 sq ft | - |
| Runoff Standard | No net increase | - |
| Detention | Commercial required | - |
| Slope | 6 in/10 ft from foundation | 6 in. / 10 ft away |
| Code | - | Ch. 34; IRC R401.3 |
| Design | - | GA Blue Book |
| Threshold | - | >5,000 sf |
Highlighted rows indicate differences between cities.
Lawrenceville FAQ
Can my neighbor change their yard grading and drain onto my lot?
No. Lawrenceville prohibits altering drainage to send additional runoff onto adjacent property. Report concerns to Planning & Development.
When do I need a grading plan in Lawrenceville?
Any land disturbance over 5,000 sq ft triggers a grading plan requirement through Planning & Development.
How should my yard slope away from my house?
Per IRC, maintain at least 6 inches of positive drainage in the first 10 feet away from your foundation.
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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