Driveway and Curb Cut Permits: Who Owns the Apron

Two approvals, two authorities

The portion of a driveway on your property is a zoning and building matter: surfacing, drainage, and whether the width and placement fit the code. The portion crossing the right-of-way is a right-of-way or street-use matter, handled by the public works or transportation department, and it is a permit to alter a public street rather than a permit to improve your land.

Where the road is a state or county highway rather than a local street, the access permit comes from that agency instead, and its standards are usually stricter than the city’s. This is a common surprise on roads that look residential but are classified as arterials.

Both approvals can be required for a single project, and neither authority routinely checks the other’s file. Ask which department handles each before you submit.

What the width rules are for

Driveway width limits exist mainly to limit the number and width of interruptions in the kerb line, because each one is a conflict point for pedestrians and a place where drainage has to be carried across. The typical residential pattern permits a single width and allows a wider apron only where a specific justification is shown.

Widening an existing driveway is treated as a new application rather than as maintenance in most places, which means an apron that was lawful when it was built may not be lawful to widen now. Where the current width exceeds today’s standard, an application to widen can trigger a requirement to bring the whole apron into compliance.

Placement, spacing and sight distance

Beyond width, the placement rules are what most applications fail on.

• Minimum spacing from an intersection, measured from the kerb return rather than from the corner of the lot.
• Spacing from other driveways, which is the usual constraint on narrow urban frontages.
• Clearance from fire hydrants, utility poles, street trees, storm drains and crosswalks.
• Sight distance — a driveway should not be positioned where a driver emerging cannot see approaching traffic, and vegetation that obstructs the sight line can be a violation even where the driveway itself is compliant.
• No encroachment into a sight-distance triangle at a corner, which is the same constraint that governs fences near intersections.

Street trees are the most frequent practical conflict, since the tree is usually protected and the driveway cannot be moved. Where the two genuinely cannot coexist, the application is generally refused rather than the tree removed.

Drainage is the hidden requirement

A driveway is impervious surface, and it changes where water goes. Most applications therefore require that runoff be handled on the site rather than discharged onto the road or a neighbouring property.

• Maintaining the existing drainage pattern, usually by keeping the flow on your own lot rather than diverting it.
• A culvert under the apron where the road has an open ditch section, sized by the public works department.
• Confirmation that the apron will not push water toward a neighbouring lot or into a storm drain not intended to take it.
• Where the project pushes past the impervious cap, a stormwater mitigation requirement.

This is the part of a driveway project most likely to be missed by a contractor working from a drawing that shows the slab but not the grading.

Materials and construction standards

Where the apron crosses public land, the public authority specifies the section — thickness, base material, reinforcement and the joint with the existing kerb and gutter. Private contractors often default to a residential section that is thinner than the street standard, which fails inspection.

The kerb itself may need to be cut by a licensed contractor with a saw rather than broken out, and the removed section has to be replaced with a proper apron transition rather than left as a ramp of asphalt. Departments differ on whether they perform the cut themselves or permit a contractor to.

Adding a second driveway or a parking pad

Requests to add a second access or to widen for extra parking are the applications most often refused, because they increase the number of kerb openings and the amount of impervious area at the same time. Where a second access is possible at all, it is usually conditional on adequate frontage and on spacing from the existing one.

A parking pad in the front yard raises an additional set of rules — how much of the frontage may be paved, whether it must be set back, and whether it counts against the impervious cap. In many jurisdictions the answer to a front-yard pad is no regardless of how it is surfaced.