Permeable vs Impermeable Driveways: Which Surfaces Need Planning Permission?

Whether a new front driveway needs planning permission in England rarely comes down to how big it is or what it looks like. It comes down to where the rain goes. Surfaces that let water soak through are treated one way, and surfaces that shed it are treated another. Every one of the six surfaces we cover sits on one side of that line or the other, and a couple of them can sit on either side depending on how they're built.

This guide sorts them, explains the three ways a sealed surface can still go ahead without an application, and covers the cases where a surface sold as permeable stops behaving like one.

The rule, in one paragraph

For a house in England, hard surfacing in the front garden (anything between the house's principal elevation and the highway) is permitted development if it's porous, or if its rainwater ends up in a lawn, border or soakaway on your own land. An impermeable surface larger than 5 square metres that sheds water onto the pavement or road needs planning permission. That applies to a replacement drive as well as a brand-new one. The Planning Portal's guide to paving a front garden sets this out, and the legal wording is Class F of the General Permitted Development Order.

Away from the front garden there's no area limit on ground-level hard surfacing, though major embanking or terracing to support it can need an application. Flats, maisonettes, listed buildings and homes where permitted development rights have been removed are outside these rules altogether.

Sorting the six surfaces

Gravel, resin bound and permeable blocks are the three surfaces people usually pick because of this rule. Our guide to the types of driveway compares all six on price and upkeep, and the gravel driveway cost guide shows why gravel is often the cheapest way to keep a large frontage permeable.

Three ways an impermeable drive avoids an application

Choosing tarmac, concrete or standard block paving doesn't commit you to a planning application. It commits you to dealing with the water. There are three routes:

1. Keep it to 5 square metres or less. That's roughly a single parking bay's worth of paving, so it rarely suits a full drive, but it can cover a path or a small extension to an existing drive.
2. Fall it towards your own garden. The drive is laid with a gentle slope towards a lawn or planted border that soaks up the run-off. This only works if that ground genuinely takes the water. Heavy clay that stays waterlogged after rain may not.
3. Collect it and send it to a soakaway. A linear drain at the low end of the drive catches the water and carries it to a soakaway, a rain garden or a permeable strip within your boundary. This adds groundwork, and the soakaway needs to be sized for the area it serves.

When a permeable surface stops counting

A surface is only as permeable as the layers beneath it. These are the cases that catch people out:

• Resin over old tarmac or concrete. The resin layer drains, but the sealed base under it doesn't, so water runs along the top of the old surface and out at the lowest edge. A resin overlay on an existing drive is often still the right job, but it needs its own drainage plan.
• Resin bonded instead of resin bound. Bonded surfaces have stone scattered onto a layer of resin, which forms a sealed skin. It isn't permeable in the way resin bound is.
• Gravel or blocks on a concrete slab. Laying a permeable top over a solid base, often to save digging out an old drive, leaves the water with nowhere to go.
• Blocked pores and joints. Silt, moss and detritus slowly clog resin and permeable block joints. The surface still counts as permeable on paper, but puddles start to form. Our driveway maintenance guide covers how to keep each surface draining.
• Ground that won't take water. Permeable surfaces drain into the sub-base and then the soil. On heavy clay the sub-base may need to be deeper to store water, or the system may need an outlet. That's a design question for the installer, covered in our driveway sub-base guide.

Scotland, Wales and Northern Ireland

The 5 square metre rule described above is the English one. Scotland, Wales and Northern Ireland each set their own permitted development rules, and they don't all match it. Wales publishes its guidance through gov.wales, and in Northern Ireland planning is handled by the local council with policy set by the Department for Infrastructure. Wherever you are outside England, check with your local planning authority before assuming a sealed drive is fine or a permeable one is exempt.

Other permissions that sit alongside planning

• A dropped kerb. Driving across a pavement needs a lowered kerb and the council's consent, whatever the drive is made of. You apply through your local council in England and Wales, and the kerb and crossover are priced separately from the drive itself.
• Conservation areas and Article 4 directions. Some councils remove permitted development rights for front gardens, so even a gravel drive can need an application.
• Listed buildings. Bigger works at a listed property may also need listed building consent, a separate process from planning. The Planning Portal's listed building page explains when.
• New parking for an electric car. If the new drive is mainly about charging at home, the cable route and dropped kerb come into the same plan. Our guide to getting a driveway ready for an electric car covers the order to do things in.

For the construction detail, including soakaways and rain gardens, the original source is the front-garden permeable surfacing guidance on gov.uk.