Guide
Planning permission, permeable surfaces and SuDS
When a driveway needs planning permission in England, what the five square metre rule actually says, and how permeable surfacing changes the position.
Updated
The rule, as it is actually written
In England, since 1 October 2008, planning permission is required to lay more than five square metres of impermeable surfacing on land between the front wall of a house and the highway. Below that area, or where the surface is permeable, or where the surfacing drains to a permeable area within the property such as a lawn or a border, it remains permitted development and no application is needed.
Two details are commonly misread. The rule applies to the land between the house and the highway, so a rear or side garden is treated differently. And "highway" includes footpaths and public rights of way, not only the road, which catches more front gardens than people expect.
The change was introduced in response to surface water flooding, on the reasoning that paving over front gardens at scale across a street sends water into drainage systems that were never sized for it.
How permeable surfacing changes things
A permeable surface allows rainfall to pass through it into the ground rather than running off. Resin bound qualifies because the voids between the resin-coated stones form a drainage path through the surface. Permeable block paving and porous asphalt qualify by their own designs.
Resin bonded does not qualify. It is a continuous resin layer with stone scattered over the top, and water runs off it. Since the two names differ by one word, this is worth confirming in writing on any quote where permeability is the reason for the choice.
The alternative route to compliance is drainage rather than surface: an impermeable driveway that discharges to a lawn, border, soakaway or other permeable area within your own property is also permitted development. What is not acceptable is directing runoff onto the highway or into a neighbouring property.
The surface is not the whole system
A permeable surface only works if water passing through it has somewhere to go, and that depends on what is underneath. Over free-draining ground, an open-graded stone sub-base is enough on its own.
Over heavy clay, water will sit in the sub-base unless the build is designed for it. That means extra sub-base depth to store water while it discharges slowly, a designed attenuation layer, or a positive outfall to a soakaway or approved drainage connection. This is a live issue across much of South Devon: the Bovey Basin clay around Newton Abbot and the clay-with-flints around Honiton both behave this way, while the sandy ground around Exmouth does not.
A permeable surface laid over undrained clay with no thought given to the sub-base can pond and stay wet, which satisfies nobody. Ask any installer specifically how they intend to handle drainage on your ground.
What else can catch you out
Dropped kerbs. Creating a new vehicle access across a pavement, or widening an existing one, needs the highway authority’s consent regardless of what you surface the driveway with, and it is a separate application from planning. Devon County Council handles this for most of the region, with Plymouth City Council and Torbay Council for their own areas.
Listed buildings. Listed building consent is needed for works affecting the character of a listed building, which can extend to its setting and to the surfacing of a forecourt. Carrying out such works without consent is a criminal offence. Honiton and central Exeter both have a high concentration of listed stock.
Conservation areas. These do not usually remove permitted development rights for surfacing on their own, but they can restrict materials and the removal of walls, railings or original paving, and an Article 4 direction can withdraw permitted development rights entirely.
National Landscapes, the designation that replaced Areas of Outstanding Natural Beauty in 2023. The Blackdown Hills and South Devon National Landscapes both cover parts of this region. Designation does not by itself remove permitted development rights for domestic surfacing, but it raises the weight given to visual impact in any application that is required.
Estate covenants and planning conditions on new-build developments, which frequently govern surfacing and drainage where the estate was approved with a single drainage scheme. These are private or conditional restrictions rather than planning law, and they are easy to miss because nobody mentions them.
Where to check
The planning authority for your property is the place to get a definitive answer, and it is free to ask. That is Plymouth City Council, Torbay Council, East Devon District Council, Teignbridge District Council, South Hams District Council, Mid Devon District Council or West Devon Borough Council depending on where you are.
Everything on this page is general guidance intended to help you ask the right questions. It is not legal advice and it is not a compliance guarantee. Rules change, and the position for an individual property can turn on details that only the local authority can confirm.