Adding a new driveway or expanding an existing one is one of the most impervious-surface-intensive projects a homeowner can do. In many jurisdictions, driveway changes require a permit — and that permit requires a site plan.
I’m Engineer Wasim of Site Plans Online USA.
When Does a Driveway Require a Permit?
Most US jurisdictions require a permit for:
- New driveway installations
- Widening an existing driveway
- Adding a second driveway opening
- Changing driveway material (gravel to concrete or asphalt)
- Driveway connections to county or state roads (may also require a right-of-way permit)
Some jurisdictions have a minimum width or area threshold below which a permit isn’t needed. Check with your building or public works department.
What a Driveway Permit Site Plan Must Include
Standard elements:
- Property boundaries with dimensions
- Existing house and all structures
- Existing driveway (if any)
- Proposed driveway extension — location, dimensions, and materials
- Connection to street — show where the driveway meets the street and any curb cut
- Impervious surface calculation — this is critical for driveway permits
- Right-of-way notation — show the public right-of-way strip between the property line and the street
- Setbacks if required by local zoning
- North arrow, scale, title block
Impervious Surface — The Critical Element
Driveways are almost entirely impervious surfaces. Before adding or expanding a driveway, calculate whether your total hard surface coverage will stay within the zoning maximum.
Calculate:
- Existing: house footprint + garage + existing driveway + patios + walks + any other hard surface
- Add: proposed expanded driveway area
- Total as a percentage of the lot area
- Compare to your zoning district’s maximum (typically 50–65% for residential)
If the expansion pushes you over the limit, you may need to use permeable pavers, which count at a reduced rate in many jurisdictions, or reduce the scope of the expansion.
Right-of-Way and Curb Cut
If your driveway connects to a county or municipal road, you may need a separate right-of-way permit in addition to a building permit. This typically involves:
- Approval from the county or city transportation/public works department
- Curb cut specifications (width, location, ADA compliance if applicable)
Show the right-of-way strip on your site plan and label it.
Related articles:
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