Driveway extension Cost Calculator

How this calculator works

Every figure in this calculator is the one published in the cost table on our driveway extension guide. Pick the option that matches your job and the calculator returns that published range, adjusted for your region - it does not model anything the guide does not already say.

That is deliberate. A calculator whose rates drift from the page it sits under is worse than no calculator, because two numbers on the same site disagree.

What it cannot know: access, the condition of what is already there, and anything structural. Those are what separate three real quotes from each other.

What actually moves a driveway extension quote

The calculator gives you a regional budget from the figures above, but a driveway extension is really two jobs priced as one – the surfacing, and turning part of a garden into somewhere you’re allowed to park. The second part is where quotes drift apart.

The dropped kerb. If you’re crossing a footway or verge to reach the new drive you need a vehicle crossover, and that’s the council’s call, not the contractor’s. Councils set their own charges, insist on an approved installer for work in the highway, and sometimes require the footway strengthened. Check gov.uk’s page on dropped kerbs and your own council before you treat it as a formality – some junctions and busy roads simply won’t be approved.

Planning and the surface. Turning a front garden into a drive can need planning permission depending on how big it is and what you surface it with. A permeable finish, or one that drains to a border or soakaway rather than the road, usually stays within permitted development; a large impermeable slab may not. The guidance on paving over front gardens is the place to confirm which side of the line your plan falls.

Boundaries and what has to go. An extension often means taking out a wall or hedge and a strip of lawn, then making good where it met the house or the neighbour. Removing a boundary wall and reinstating the edge tidily is work some quotes bury and others itemise – so read down the line items, not just the total.

Ground, levels and services. Gardens rarely sit at the same level as the existing drive, so a quote may carry excavation and extra sub-base to bring it up. Watch too for drains, inspection covers and service runs under the ground you’re extending over – any of them can force a rethink mid-job.

Matching what’s there. An extension that blends into the existing surface reads as one drive; one in a different material or a fresh colour reads as an add-on and can dull the value it’s meant to add. If matching matters to you, say so up front so each quote prices the same finish.