Since 1 October 2008, a new or replacement hard surface of more than 5m² between the front of a house and the road can be laid without planning permission only if it is made of porous materials, or if the rainwater from it is directed to a permeable area inside the property, such as a lawn, a planted border or a soakaway. If neither is true, you need planning permission, and permission for an impermeable front drive that drains onto the road is often refused.
It applies to houses in England; Wales and Scotland have their own rules. This is general information, not legal advice.
Where the rule comes from
The rule is condition F.1 of Class F in the householder permitted development rules (now the General Permitted Development Order 2015). Where a hard surface would sit between a wall forming the principal elevation of the house and a highway, and would exceed 5m², it must either be made of porous materials or drain to a permeable or porous area within the curtilage of the house. It followed the 2007 floods, when paved front gardens were found to be sending water straight into overloaded drains and onto roads.
What the rule covers, and what it does not
| Situation | Is the 5m² rule relevant? |
|---|---|
| New driveway in the front garden of a house | Yes |
| Replacing an old front drive, even one laid before 2008 | Yes, the new surface must comply |
| Side garden of a corner house, facing a road | Usually yes, because it sits between a principal wall and a highway |
| Back garden not facing a road | No size limit under Class F |
| Front path or patio under 5m² in total | No |
| Flats and maisonettes | Class F does not apply: planning permission is usually needed for any new hard surface |
| Repairing a small part of an existing drive | Generally no, but a full relay counts as new |
The 5m² is the area of the new hard surface at the front, not the whole front garden. Two cars need about 30m², so almost every front driveway is caught.
What counts as permeable
"Permeable" means water passes through the surface and the layers beneath into the ground. A porous top on a sealed base still sheds water. The common options:
- Permeable block paving. Blocks with wider joints or spacer nibs, filled with fine grit rather than sand, laid on an open-graded sub-base (a stone layer with the fine particles removed so water can pass and be stored). Standard block paving laid on sand over compacted Type 1 is not permeable in any useful sense.
- Resin-bound surfacing. The resin-and-stone mix is porous. It counts as permeable when laid on a porous base, such as an open-graded asphalt over a free-draining sub-base. Resin laid over an existing sound tarmac or concrete drive looks the same but the water still runs off the old base, so it needs run-off to a permeable area to comply. Resin-bonded (loose stone scattered onto a resin coat) is not permeable.
- Gravel on a free-draining base, ideally with a stabilising grid to stop ruts and scatter.
- Porous asphalt or porous concrete, specified as such. Ordinary tarmac and ordinary concrete are not porous.
- Grass reinforcement grids filled with soil and seeded, or with gravel.
On clay, which is common across Birmingham and the Black Country, water soaks in slowly. A permeable surface on heavy clay may need a deeper sub-base to store water, or an overflow, and a good installer will say so.
The other way to comply: send the water somewhere permeable
You can use a traditional surface such as tarmac, imprinted concrete or standard block paving if every drop that falls on it runs onto a permeable area within your own boundary. In practice:
- Fall to a lawn or border. Lay the drive with a gentle slope towards a lawn, planted bed or gravel strip big enough to take the water. The government guidance suggests the permeable area should be reasonably large compared with the paved area.
- Channel drain to a soakaway. A channel across the low edge pipes the water to a soakaway, a buried crate or stone-filled pit that lets it soak into the ground. Soakaways should normally be at least 5m from buildings and sized from a percolation test. See drainage and soakaways. A soakaway typically adds £600–£1,200, and a channel drain £60–£100 per metre.
- Rain garden. A shallow planted dip that holds water while it soaks away.
What does not comply: water running onto the pavement or road, into a road gully or into the public sewer.
What happens if you ignore it
A front drive over 5m² that is neither permeable nor draining to your own land is development without planning permission. In practice:
- Enforcement. The council can require a retrospective planning application or serve an enforcement notice requiring the surface to be altered or removed. Councils usually act on complaints, often about water pouring onto the pavement.
- Time limits. For operational development completed after 25 April 2024 in England, the council has 10 years to take enforcement action, up from the previous 4.
- Selling the house. A buyer's solicitor may ask how the drive drains, leading to indemnity insurance or a retrospective application.
- Water onto the road. Separately from planning, highway authorities have powers under the Highways Act 1980 to require owners to stop surface water flowing from their land onto the highway.
Fixing a problem drive is usually a drainage job, not a relay: a channel drain along the low edge and a soakaway is often enough.
Cost: permeable does not have to mean expensive
Indicative West Midlands prices, supply and fit, waste included:
| Surface | Per m² | Permeable as usually laid? |
|---|---|---|
| Resin-bound on a new porous base | £75–£115 | Yes |
| Gravel | £35–£60 | Yes |
| Block paving | £90–£140 | Only if permeable blocks and base are specified |
| Tarmac | £50–£80 | No, needs run-off to a lawn, border or soakaway |
| Resin over existing sound tarmac | £55–£80 | No, the old base sheds water |
For a two-car drive, resin on grass comes to about £3,100–£4,980, block paving £3,550–£5,730, rising to about £6,930 where a soakaway may be needed. See the driveway cost per m² guide and our pages on resin driveways, block paving and gravel driveways.
Our estimate flags front-garden jobs where the chosen surface is not permeable, and the one local specialist we pass your enquiry to will confirm how the water will be handled. For the wider planning picture, see do I need planning permission for a driveway?.
Questions
Is resin-bound paving automatically permeable?
Only if the base under it is permeable too. Resin-bound laid on an open-graded base lets water through. The same material laid over old tarmac or concrete sheds water just as the old drive did, so you would need run-off to a lawn, border or soakaway to comply.
Does the rule apply if my drive was paved before 2008?
An existing surface laid before 1 October 2008 is not affected. If you dig it up and lay a new front drive, the new surface must comply.
Can I drain my front drive into the road gully or sewer?
Not as a way of meeting the rule. The condition requires the water to go to a permeable area within your property. Connecting to a public sewer needs the water company's consent, and draining onto the road can breach highway rules.
What if my soil is heavy clay?
It can still work with design: a deeper open-graded sub-base stores water while it drains slowly, sometimes with an overflow. A percolation test shows how fast your ground drains.
Do I need planning permission if the drive is exactly 5m²?
No. The condition applies only where the new hard surface would exceed 5m². A small front path or a hardstanding for bins under that size is not caught.