Will repaving my lot trigger stormwater rules?
It can. Once a job paves or repaves 5,000 square feet or more, it has to treat its own stormwater on site. The part most owners miss is that repaving counts, so tearing out and replacing an old lot can trigger it.
Regulators care about how much hard surface sheds water and where that water goes. Larger projects may need to manage runoff on site with the right grading and drainage features.
“Repaving counts, so tearing out and replacing an old lot can trigger stormwater rules on its own.”
North Bay Grading and PavingSonoma County
What triggers the rule
Under the Bay Area stormwater permit, a project that creates or replaces 5,000 square feet or more of paved surface has to treat its own stormwater. The detail that catches owners off guard is that replaced surface counts the same as new, so a straight tear-out and repave can cross the line with no added pavement.
What it means for your budget
A triggered project needs treatment like a bioretention area or permeable paving, often sized around 4 percent of the paved area. That takes space and budget, so it pays to know early. We flag it before you commit, design the grading and drainage to meet it, and confirm what applies to your watershed.
- Trigger at 5,000 square feet
- Repaving counts too
- We flag it early
The key is to know before you bid. We will flag likely stormwater considerations during your estimate so there are no surprises mid-project.
