You can lay tarmac over an existing gravel driveway, but only once the gravelâs been cleared back to a proper compacted sub-base, not laid straight on top of loose stone. A standard domestic tarmac driveway in Kent typically costs ÂŁ2,500âÂŁ6,500, and if your drive is over 5m², swapping permeable gravel for solid tarmac can bring planning permission into play. Hereâs what actually matters before you commit.
Can you lay tarmac over gravel?
With the right prep you can. Gravel driveways arenât often built with a proper sub-base underneath; the stone often sits straight on soil or old hardcore. Before any tarmac goes down, that gravel needs digging out, the ground needs compacting, and a correctly graded sub-base needs building up in its place. Skip out on a strong foundation and youâre not saving money, youâre just delaying the problem.
Weâve been laying tarmac across Kent for 45 years. If someone tries to shortcut the groundwork, it will almost inevitably end in failure.
What happens if the groundwork is wrong?
Bad preparation quickly causes issues, and it wonât be cheap to fix once tarmac has been laid. A poor foundation causes potholes, sinking at the edges, or cracking where the sub-base hasnât been compacted evenly, and standing water where drainage falls have been ignored.
Ensuring your ground is compacted well matters more than most guides mention. Gravel is permeable, so rain soaks straight through it. Tarmac isnât. Under UK planning rules, replacing more than 5m² of front garden with a non-permeable surface like standard tarmac can require planning permission, unless the water is directed to a lawn, border, or soakaway instead. Itâs worth checking this before work starts, not after. Full detail is in GOV.UKâs guidance on permeable surfacing.
Why homeowners choose tarmac over gravel
Gravel looks appealing on a spec sheet. Living with it is a different story. Stones migrate onto the road and into the hallway. Weeds push through. Ruts form where cars turn. Every few years, youâre topping up bags just to keep it level.
Tarmac removes that maintenance cycle almost entirely. It gives you one smooth, level surface thatâs easier for prams, wheelchairs, and low-slung cars, and easier to keep clean with an occasional jet wash. For a lot of our Kent customers, thatâs the whole decision in one sentence: no more raking gravel back into place every spring.
Tarmac vs gravel: how do they compare?
| Factor | Tarmac | Gravel |
|---|---|---|
| Typical Kent driveway cost | ÂŁ2,500âÂŁ6,500 | Lower upfront, but recurring top-up costs |
| Maintenance | Occasional jet wash and resealing | Regular raking, weeding, restocking |
| Drainage | Impermeable, needs designed-in drainage | Naturally permeable |
| Planning permission | May apply over 5m² without drainage provision | Generally exempt |
| Surface finish | Smooth, uniform, easy for wheels/prams | Loose, textured, can shift underfoot |
Is tarmac better for driveways or larger areas?
Tarmac works well at both ends. On a domestic driveway, the finish and low upkeep are usually the deciding factors, and cost is driven mainly by size and how much groundwork the old gravel needs. On larger areas, such as private roads, car parks, or bigger commercial forecourts, the per square metre cost tends to fall, because the setup cost of getting a gang and equipment on site stays roughly the same whether the jobâs 20m² or 200m². If youâve got a modest single driveway, donât assume the price scales down proportionally from a big commercial job. Ask for a site-specific quote instead of working from a per-m² average.
Pros and cons of tarmac
Pros
- Durable for decades with basic upkeep
- Quick to install
- Smooth and consistent finish
- No ongoing stone top-ups
- Straightforward to repair in sections if needed
Cons
- Higher upfront cost than gravel
- Less âcustomisableâ in appearance
- Impermeable so drainage and planning need thinking about upfront
- Short-term disruption while itâs laid
Our recommendation
For most homeowners, a gravel driveway ends up being more hassle than itâs worth. If thatâs you, tarmac is generally worth the outlay, provided the groundworkâs done properly and drainage is accounted for from the start. Thatâs the bit that separates a driveway that lasts 20 years from one that needs redoing in three.
We offer free, no-obligation site surveys across Kent, where weâll check your existing sub-base, flag any planning or drainage considerations, and give you an honest quote rather than a guess. See our domestic tarmac driveway service or our full 2026 Kent cost breakdown for more detail, or get in touch for a survey.
FAQs
How much does it cost to convert a gravel driveway to tarmac in Kent?
Most standard domestic conversions run ÂŁ2,500âÂŁ6,500, depending on the drivewayâs size, access for machinery, and how much work the existing gravel base needs before tarmac can go down.
Do I need planning permission to replace gravel with tarmac?
Possibly. If the area is over 5m² and the tarmac wonât allow water to drain to a permeable area, you may need permission under UK front-garden drainage rules. A surveyor can confirm this before work starts.
How long does a gravel to tarmac conversion take?
Most domestic jobs are completed within a few days, depending on driveway size and whether the ground needs digging out and re-grading before the tarmacâs laid.