Driveways: when you need planning permission, and where the water has to go
The government guidance that contains the rule also contains a drainage test you can run yourself before you accept a quote.
Planning permission is not triggered by the size of a driveway. It is triggered by impermeable surfacing over 5 square metres in a front garden that does not drain to a permeable area. A permeable drive of any size is permitted development. The catch is that permeable surfacing on clay ground does not actually drain.
The short version
- Three conditions have to be true together before you need permission: more than 5 square metres, impermeable surfacing, and no provision for the water to run to a permeable area. Break any one of the three and the drive is permitted development.
- The rules cover your front garden only. A back garden patio is a different question and the 5 square metre figure has nothing to do with it.
- The government’s own guidance contains a test you can run yourself. Dig a pit 300 mm each way, fill it with water, and if it takes more than 11 hours to empty, a pipe is required. Run it before you accept a quote, not after.
- Resin bound is permeable. Resin bonded is not. They sound the same and only one of them keeps you inside permitted development, so get the word written on the quotation.
- A dropped kerb is a separate application, to a different team, under a different Act, and possibly to a different organisation altogether.
The rule
What the government guidance actually says, word for word
The rule is about the surface and where the water goes, not about how big the drive is. Almost every version of it you will read online has that backwards.
The document that contains it is the government’s guidance on the permeable surfacing of front gardens, published on 13 May 2009 and still the source everyone else paraphrases. It does not appear on the first page of results for the question most people type, so the rule reaches homeowners second hand, through pages written by firms selling one surface or another, and the half that matters goes missing on the way:
“If the surface to be covered is more than 5 square metres planning permission will be needed for laying traditional, impermeable driveways that do not provide for the water to run to a permeable area.”
Three conditions have to be true at once before permission is needed: more than 5 square metres, impermeable, and no provision for the water to run to a permeable area. Break any one of them and you are in permitted development. The exemption is stated just as plainly:
“You will not need planning permission if a new or replacement driveway of any size uses permeable (or porous) surfacing which allows water to drain through, such as gravel, permeable concrete block paving or porous asphalt, or if the rainwater is directed to a lawn or border to drain naturally.”
Of any size, with no threshold. If the surface is permeable, or the run-off goes to a lawn or a border, you can pave the whole front garden with no application at all. Gravel is named in the guidance itself, so the surface people are sniffiest about has the simplest legal position of the lot.
The scope nobody quotes
Here is the sentence missing from most pages carrying this rule. The Planning Portal’s page on paving your front garden says it in seven words: “these rules only cover your front garden.” It adds that there are different rules for patios and driveways that are not part of a front garden.
A striking number of contractor pages state the 5 square metre rule as though it governed any paving anywhere on the property. It does not. It is a front garden rule, written to slow the loss of front gardens to hardstanding.
So: at the front, a sealed surface over 5 square metres needs either a permeable area for the water to run to or a planning application. Round the back, if somebody cites the 5 square metre rule at you, ask which document it comes from. Planning permission, building regulations and listed building consent have three different triggers, and our guide to which of the three you actually need sorts out which is in play.
The test
The 11 hour test, which you can run yourself with a spade and a hose
Buried in the same guidance is a test that decides whether your driveway will work: “As a rule of thumb a pipe will be required if it takes a water filled 300 mm by 300 mm by 300 mm pit more than 11 hours to empty.”
That is a percolation test, and it answers the only question that really matters about a driveway: can the ground underneath take the water away. Run it and you will know whether the drive you are being sold is a drainage system or a storage tank.
How to run it
- Pick the spot properly. Dig where the drive is going, at the low end, and keep clear of the house: the guidance says soakaways should not be built close to building foundations, and that for small driveways a minimum distance of 3 m should be suitable.
- Dig a pit 300 mm each way. Straight sides, flat bottom, roughly a foot cube. Do not polish the sides with the spade, because a smeared clay face drains slower than the real ground.
- Fill it once and let it go. That pre-soak wets the sides, so the second fill measures the soil, not a dry summer crust.
- Fill it again and note the time. Phone photographs with timestamps are the easiest record.
- Come back and read it. Empty inside 11 hours and a permeable surface has somewhere to drain to. Still holding water after 11 hours and the guidance’s own conclusion applies: a pipe will be required.
- Test in the worst conditions you can get. February after a wet fortnight tells you the truth. August after three dry weeks tells you what you want to hear.
A second, quicker test in the same guidance answers a different question. “If it is hard to drive a 50 mm square wooden peg more than 150 mm into the ground then the soil is strong enough to support the drive.” That is a bearing test, not a drainage test, and clay passes one and fails the other: firm enough to build on, hopeless at soaking up.
What the guidance says when the test fails
It does not tell you to abandon the drive, it tells you to give the water somewhere else to go. On clay soils, it says, it may be necessary to connect to the house roof water drain, and on very clayey soils that cannot soak up a lot of water it is a wise precaution to include a pipe in the sub-base to drain water to the roof drains.
That second point is cheap while the drive is open and expensive afterwards. A perforated pipe in the sub-base is an hour and a few metres of pipe now, and taking the whole drive up later. If your result is near 11 hours, have the pipe put in and ask for it on the quote.
Two more instructions from the same document. The driveway should be sloped away from the house wherever possible towards the road. And: “Don’t direct water towards a neighbour’s property.”
Before you dig. Services in front gardens are often shallow, so find out what is down there first. And treat the neighbour point as more than guidance: sending your surface water onto somebody else’s land is a civil matter, and a drive that floods next door in its first winter is a dispute you live next to for years.
Three routes
The three ways a front driveway can be lawful
A front driveway over 5 square metres can be lawful in only three ways, and choosing between them is the whole decision. The surface you like the look of comes second.
| Dimension | Permeable surface | Impermeable, draining to a permeable area | Impermeable, draining to a pipe or the highway |
|---|---|---|---|
| Planning permission, front garden, over 5 square metres | Not needed, at any size | Not needed, at any size | Needed |
| What it looks like | Gravel, permeable concrete block paving, porous asphalt, resin bound | Standard block paving, tarmac, concrete, resin bonded, imprinted concrete, all falling to a lawn or border | The same materials falling to a gulley, a channel drain or the road |
| Sub-base | Open graded, reduced fines, so water can move through it and be stored. Type 3 rather than Type 1 | Type 1, compacted | Type 1, compacted |
| What decides whether it works | The 11 hour pit test. Fail it and the storage layer has nowhere to empty to | The same test, applied to the lawn or border. A 2 m strip of clay lawn is not a permeable area | Where the pipe is allowed to discharge, and who agreed it |
| The usual failure | Laid on clay. The layer fills in November and stays full until March | The soft area is too small, too compacted, or uphill of the drive | Discharging to the highway without the highway authority’s agreement |
The middle column is the one people forget exists. You do not have to accept gravel to stay inside permitted development: a conventional block paved drive falling towards a decent border is exempt too, at any size. It stops being exempt the day somebody paves the border.
Resin bound and resin bonded are not the same word
Resin bound means the aggregate is mixed through the resin and trowelled out as one layer. Water passes through it. It is permeable. Resin bonded means the resin is spread on the base and the aggregate is scattered on top. The surface underneath is sealed. It is not permeable.
They look similar in a photograph, they are described in near-identical language on installers’ websites, and somebody asking for “a resin driveway” can get either. Over 5 square metres at the front with no permeable area to drain to, only one of them is permitted development. The other needs a planning application nobody has made.
The fix takes ten seconds. Ask for the word to be written on the quotation: bound or bonded. Not “resin driveway”, not “resin system”. If it will not go in writing, that tells you something. The wear, repair and appearance comparison sits in resin bound against block paving against tarmac. This page is the drainage and law decision, and the two are answered separately.
The expensive mistake
A permeable surface on ground that cannot take water is not drainage
Laying a permeable surface on ground that cannot take water is the most common and most expensive mistake in domestic driveway work, and it is the verdict of this page. The permeability of the surface is worthless if the ground beneath it cannot take the water.
Here is how it goes. The drive is laid in permeable block paving or resin bound over an open graded sub-base, which is right in principle: those voids hold the rain for a few hours and let it soak into the ground underneath. On clay it does not soak in. The layer fills in the first heavy November rain, has nowhere to empty to, and stays full. By January the water stands at the surface and the drive is a shallow pond with gravel on it. Everybody did the permeable thing and nobody did the drainage thing.
The planning position, awkwardly, is fine. The surface is permeable, so no permission was needed and none was skipped. The drive is lawful and useless at once. That is why the 11 hour test belongs before the order rather than after the first winter. If your drive is already doing this, the causes and the realistic repairs are in why a driveway sinks or holds water.
When the test fails, the honest answer is a positive outfall: a pipe, an agreed discharge point and, if the surface is impermeable and over 5 square metres at the front, a planning application too. It is dearer than the version that does not work, and it is the right job. Approved Document H sets the hierarchy the discharge must follow, soaking away first, a watercourse next, a sewer last, which is why a builder cannot pipe the drive into the nearest drain and call it done.
If your gutters already overflow, do not tie a new drive into the same underground pipe: what an overflowing gutter is telling you is usually a blockage or capacity problem that wants sorting first.
What the quote has to say before you sign it
All three surfaces fail the same way and it is almost never the surface. It is the ground and the base. A quote that names a product but says nothing about what is under it is a quote for a finish, not for a driveway. Ask for four things in writing:
- The excavation depth, what is being taken out, and whether a geotextile goes over the soil.
- The sub-base material and depth, and whether it is open graded or Type 1. On a permeable drive that word decides everything: Type 1 carries the fines that stop water moving.
- The drainage arrangement in one sentence: soaking into the ground, running to a named soft area, or piped to a named point. And whether a pipe is going in the sub-base.
- Which way the drive falls, confirmed as away from the house and not towards a neighbour.
Those four lines separate a driveway from a surface, on the same principle as the line items to look for in a roofing quote. The parts you cannot see afterwards are the parts that have to be written down beforehand.
The other application
The dropped kerb is a separate application under a different Act
Permission for the drive and permission to drive across the footway are two unrelated applications: different team, different Act, and in some places a different organisation. People discover this once the drive is finished and there is still a kerb in front of it.
The vehicle crossing sits under section 184 of the Highways Act 1980, not under planning law. The highway authority controls it, can serve notice on the owner and the occupier, may impose conditions, and has to weigh damage to the footway, safe access and the passage of traffic. Under section 184(7) it may recover the expenses reasonably incurred by it from the owner or occupier of the premises.
Driving over a footway without a crossing is not a grey area. The Planning Portal puts it plainly: a dropped kerb is required if you want to drive over a pavement onto your property, and it is illegal to do so without one.
When planning permission is needed as well
Sometimes it is, and the trigger is the road rather than the drive. The Planning Portal on planning permission for dropped kerbs says that largely dropped kerbs are not a planning matter, but that in some cases planning permission will be required, and the factors it names include whether the road is classified or a trunk road, whether the property is listed or in a conservation area, and whether structural work is needed to form the parking area.
So the practical question is what class of road you live on. A crossing onto an unclassified residential street is usually a highways matter only. A crossing onto an A, B or C road usually is not. Ask the planning department before the highways team. The same permitted development logic runs through the house itself, in planning permission for replacing a roof.
Find out who your highway authority actually is
It is not always the council that handles your planning. In two-tier areas the county council is the highway authority while the district council handles planning. In the New Forest National Park, planning goes to the National Park Authority, building control to the district council, and highway matters including the dropped kerb to Hampshire County Council. Three organisations, one driveway. Ask at the start and put the answer in your file.
Charges are set by each authority and published. BCP Council’s dropped kerb page gives a guide price of £2,000 for a standard sized crossover of three dropped kerbs and two tapers, moving with traffic management, with adjusting inspection and stop cock covers, and with replacing grass with tarmac. It also expects the deeds to be checked first, because not every property may be parked on, and a tenant needs the landlord’s written permission. The next authority along publishes different figures, so read the one covering your address.
The wider policy
Where the law on sustainable drainage stands
The law on sustainable drainage has been unsettled for years, so here is what is fixed, with no prediction attached.
Schedule 3 to the Flood and Water Management Act 2010 would set up a sustainable drainage approving body and make sustainable drainage mandatory for new development, with approval needed before construction starts. It is in force in Wales, commenced in stages in 2018 and 2019. When a Defra consultation on taking sustainable drainage forward in England closed on 10 March 2026, it had not been commenced in England. The commencement notes on legislation.gov.uk list every commencement, so they are the place to check whether that has changed.
Two things follow. Domestic front garden paving has never been inside Schedule 3 anyway, so nothing about the 5 square metre rule or the permeable exemption turns on it. And every version of the policy under discussion asks what the 11 hour test asks: where does the water go. A drive built to answer that will not be caught out by whatever lands.
If anyone quotes you a rule about mandatory sustainable drainage approval for a domestic driveway in England, ask which commencement order they are relying on.
Next steps
What to do next
Before choosing a driveway surface, measure the area to see whether the 5 square metre rule applies, and run the 11 hour pit test where the drive is going. The first two cost nothing and they decide more than the choice of surface does.
- Measure the area, and check whether it is more than 5 square metres and whether it is in the front garden. If it is under, or it is round the back, this rule is not your rule.
- Run the 11 hour pit test where the drive is going, in the wettest conditions you can get, and photograph it with timestamps. That result decides everything downstream.
- Choose which of the three lawful routes you are taking: permeable surface, impermeable draining to a genuine permeable area, or impermeable with a piped outfall and a planning application.
- If you want resin, get the word bound or bonded written on the quotation before you agree anything.
- Ask every quote for the excavation depth, the sub-base material and depth, the geotextile, where the water goes, and whether a pipe is going in the sub-base. Compare quotes on those lines rather than on the surface.
- If you need a dropped kerb, start that application separately and early, find out which organisation is your highway authority, and check your road classification before assuming planning is not involved.
- Ask your own planning authority about anything borderline. It is a free question and the answer comes in writing.
If you would rather somebody came and looked at the ground, that is what our driveway and patio work covers, and where the answer turns out to be roof water the roofing side deals with that. Thomas Hannen comes out and prices the job himself, and a free written itemised quote comes out of the visit. If what he finds is that your ground will not take the water and the drive you have been quoted for will pond, that is what the quote will say, even though it is the dearer answer.
Questions
Common questions
Do I need planning permission for a driveway over 5 square metres?
Only if the surfacing is impermeable and there is no provision for the water to run to a permeable area, and only in a front garden. All three conditions have to be true together. A permeable drive of any size, or an impermeable one draining to a lawn or border, is permitted development.
Is a gravel driveway permitted development?
Yes. Gravel is named in the government's guidance on the permeable surfacing of front gardens as a permeable surface, alongside permeable concrete block paving and porous asphalt. A gravel drive of any size in a front garden needs no planning permission.
How do I know whether my ground will drain?
Dig a pit 300 mm by 300 mm by 300 mm where the drive is going, fill it with water once and let it drain, then fill it again and time it. The government's guidance says that as a rule of thumb a pipe will be required if it takes more than 11 hours to empty.
What is the difference between resin bound and resin bonded?
Resin bound has the aggregate mixed through the resin, so water passes through and it is permeable. Resin bonded has the resin spread on the base with aggregate scattered on top, which seals the surface, so it is not permeable. Get the word written on your quotation.
Does the 5 square metre rule apply to a back garden patio?
No, the Planning Portal states that these rules only cover your front garden, and that there are different rules for patios and driveways that are not part of a front garden.
Read next
Related advice
The guides below pick up where this one leaves off, and the driveways and patios page covers the work itself and the places we cover, if you would rather have the job looked at.
- Resin bound, block paving or tarmac: which driveway surface?
- Why a driveway sinks or holds water
- Planning permission, building regulations, listed building consent: which one you actually need
- The gutter overflows in heavy rain but not in light rain: what that means
Driveways and patios, and where we cover All advice articles
Who wrote this
Thomas Hannen
Thomas owns Bournemouth Roofing & Building and prices every job himself instead of sending somebody else. The company is Bournemouth Roofing & Building Ltd, number 15471719, registered in England and Wales. If you want to talk something through before you commit to anything, the site visit and the written itemised quote are both free.
Free quote
Not sure whether your ground will take the water?
Thomas comes out, looks at the ground rather than the brochure, and puts what he found in writing. If the honest answer is a piped outfall rather than a permeable surface, that is what he will price.