A Gravel Driveway — Simple to Install, Surprisingly Easy to Get Wrong

Gravel is the cheapest driveway surface and the most straightforward to install — which is precisely why so many gravel driveways are done poorly. A thin scatter of gravel on bare soil, a membrane that becomes a weed nursery, or the wrong aggregate size for vehicle use: these are not rare mistakes. They are the norm for DIY installations and a depressing proportion of contractor jobs at the budget end of the market.

Depth and Compaction

A gravel driveway that is driven on needs at least 50mm of aggregate depth on a prepared base — and ideally 75mm for regular car use. Gravel thinner than this shifts, leaves bare patches, and is picked up on tyres and thrown into lawns and borders. The sub-base beneath should be prepared in the same way as any other driveway surface: vegetation and topsoil removed, hardcore or MOT Type 1 compacted to a firm surface. Laying gravel directly on topsoil means the gravel gradually disappears into the ground as vehicles compact the soil below.

The Membrane Question

A weed membrane under gravel will suppress weeds that grow up from below — but it will not prevent weeds from seeding into the gravel from above. Within a few years, the surface of the gravel accumulates enough organic debris to support weed growth regardless of what is underneath. A membrane is still worthwhile because it prevents gravel from sinking into the sub-base, but it is not a substitute for proper depth or a permanent solution to weeds. Be cautious of contractors who use thin, non-woven landscape fabric — this type breaks down relatively quickly and is more difficult to remove when it fails than a proper geotextile membrane.

Aggregate Choice

Not all gravel is equally suitable for driveways. The ideal aggregate for vehicle use is angular crushed stone (granite, limestone, or basalt) at 10–20mm. Angular chippings interlock under load and stay put; rounded pea gravel and similar aggregates roll and scatter under tyre contact and are uncomfortable underfoot. Decorative gravels such as Cotswold buff or golden gravel are typically rounded and softer than crushed stone — fine for pedestrian areas but a poor choice for driven surfaces.

Edging Containment

Without effective edging, gravel drifts onto lawns, paths, and the public pavement. Concrete gravel boards, metal edging, or brick or block borders all work. Plastic peg-in edging is the weakest option and rarely contains gravel effectively once vehicles are driving over the area. Whatever the edging type, it needs to extend far enough above the gravel surface to actually retain it — edging that finishes at the same level as the aggregate is decorative, not functional.