Garden walls: the height rules, and the demolition trap
One metre next to a road, two metres elsewhere, and that is the easy half. The half that gets people prosecuted is taking a wall down in a conservation area, where there is no height threshold at all.
Permitted development lets you build a garden wall up to 1 metre high where it is next to a highway used by vehicles, and up to 2 metres anywhere else. Taking one down is the part that catches people. In a conservation area, demolishing any part of any garden wall needs planning permission, at any height.
The short version
- The 1 metre limit is triggered by a highway used by vehicular traffic, not by being at the front. A back boundary onto a vehicular lane takes it.
- Height is measured from ground level at the foot of the wall, so on a sloping plot the wall has to step.
- Outside a conservation area you can take down a garden wall of any height and there is nothing to apply for.
- Inside one, the 2021 Direction sets no height threshold. Demolition without permission is a criminal offence and enforcement against it never times out.
- A wall astride the boundary is a party fence wall, so a party wall notice can be due where planning permission is not.
Building one
What you may put up without asking anyone
One metre next to a road, two metres everywhere else, measured from ground level, and for most gardens that is the end of the question. It comes from Part 2 of the General Permitted Development Order.
Class A permits "the erection, construction, maintenance, improvement or alteration of a gate, fence, wall or other means of enclosure", then withdraws it in four situations: height over 1 metre above ground level where the enclosure is adjacent to a highway used by vehicular traffic; over 2 metres in any other case; maintenance or alteration taking a wall above its former height or the applicable limit, whichever is greater; and anything within the curtilage of, or to an enclosure surrounding, a listed building.
The third limb is worth money. An old wall already standing at 2.4 metres is not an illegal wall: its former height is the reference point, so repairing it, repointing it and rebuilding a leaning section to that height stays inside Class A. What you may not do is add two courses and a coping while the scaffold is up.
The listed building limb catches a wall surrounding a listed building as well as one inside its curtilage. The Planning Portal sets out the same four conditions in plainer words and adds the one everyone forgets, that the right can be removed by an article 4 direction or a condition on the estate's original permission.
And here is the thing nobody says out loud. Class A carries no exclusion for conservation areas, so designation changes nothing about what you may build. It changes what you may take down, which is the opposite of what people assume.
Two corrections
The bit almost every page gets wrong
Two details decide most real garden wall cases, and the shorthand gets both wrong: the 1 metre limit applies next to a highway used by vehicles, not simply at the front, and height is measured from the natural ground at the foot of the wall.
It is about vehicles, not about the front
"One metre at the front, two metres at the back" is a useful summary and it is not the rule. The Order says 1 metre where the enclosure is adjacent to a highway used by vehicular traffic, and the Planning Portal reads that as including the footpath of such a highway. Where that boundary sits is irrelevant.
A rear garden backing onto a vehicular service lane takes the 1 metre limit there, so a 1.8 metre fence along it is a planning application. The other way round, a front boundary facing a footpath with no vehicle access takes 2 metres. Work out what the boundary adjoins before anybody sets out the first course.
Ground level is the ground at the foot of the wall
Height is measured from the natural ground level at the base of the wall, not a level you choose. On a plot that falls a metre along the boundary, that decides the job.
A wall built level along the top of a falling site is 1 metre high at one end and 2 metres at the other, and the low end is the one that gets measured. Step it down the slope in bays instead, with every bay inside the limit, which means more piers and more setting out, so it belongs in the quote rather than a surprise halfway through. Raising the ground behind the wall does not help either: it changes the level you stand on, not the level the wall rises from.
A wall that also retains a bank answers to more than planning, and the map is in planning permission, building regulations and listed building consent.
The trap
Taking one down can need consent too
Outside a conservation area, demolishing a garden wall is not development at all. Inside one it needs planning permission, doing it without is a criminal offence, and no height threshold applies.
The Secretary of State made the Town and Country Planning (Demolition, Description of Buildings) Direction 2021, in force on 21 April 2021 and applying to England only. Paragraph 3(1) says the demolition of two descriptions of building is not to be taken to involve development of land: any building of no more than 50 cubic metres measured externally, and "the whole or any part of any gate, fence, wall or other means of enclosure". Paragraph 3(2)(a) then takes back "any gate, fence, wall or other means of enclosure in a conservation area".
You have already passed the point where a height would have been mentioned. It is not there: no metres, no cubic content, no line between a Victorian boundary wall and a knee-high edging to a path. Note what the exclusion leaves alone. The 50 cubic metre limb survives designation, so a small outbuilding can still come down in a conservation area while the wall beside it cannot.
The permitted development route closes at the same time. Part 11 Class C permits "any building operation consisting of the demolition of the whole or any part of any gate, fence, wall or other means of enclosure", then withdraws it where the demolition is "relevant demolition" for the purposes of section 196D. In a conservation area it is, so Class C does not apply and an ordinary planning application is what is left.
This one is criminal, not administrative. Section 196D of the Town and Country Planning Act 1990 makes it an offence to carry out, or cause or permit to be carried out, relevant demolition without the required planning permission, and conviction on indictment carries up to two years. And for anyone hoping to sit it out, section 171B(2A) states that "there is no restriction on when enforcement action may be taken in relation to a breach of planning control in respect of relevant demolition". The immunity periods that protect other planning breaches never start running, so a wall taken out in 2003 is as enforceable today as one taken out last week. It usually surfaces at sale.
| The job | Outside a conservation area | Inside one |
|---|---|---|
| New wall, 1 metre by a vehicular highway or 2 metres elsewhere | Permitted development, Class A | The same. Designation changes nothing here |
| New wall above those heights | Planning application | Planning application |
| Repointing and repair, no change of height | Maintenance under Class A | Maintenance under Class A |
| Taking the whole wall down | Not development at all | Planning permission, and an offence without it |
| Taking out a section for a new drive or gate | Not development at all | Caught by the same words: "any part of" |
The last row is where real jobs go wrong. Nobody rings the council about demolition, because it never occurs to them that taking three metres out of a wall for a dropped kerb is demolition. The same offence from the roof end is in re-roofing in a conservation area.
Honestly
Where the statute is clear and the practice is not
Search this and you will be told, confidently, that a wall under 1 metre abutting a highway or under 2 metres elsewhere can be demolished in a conservation area without permission. That is the 2014 Direction's structure, and the 2021 Direction revoked the 2014 one as respects England.
The current text has no height carve-out. It was made mainly to bring statues, memorials and monuments into control, and its background note discusses nothing else, but the thresholds went anyway and it is the operative wording that binds you.
Now the honest part. Practice is softer than the text. Some authorities apply a degree of common sense to a very low edging, and some commentators argue that a modest wall is not a "building" at all for section 196D purposes, which is a real argument rather than an invented one. Even the Planning Portal hedges, saying only that you "might need permission" to take a wall down in a conservation area. The text is unambiguous, the practice varies, and nobody can tell you from a distance which your council runs.
Which makes the answer easy. Ring the conservation team before you touch it, describe the wall and what is coming out of it, and ask them to confirm by email. A duty officer will usually settle it in one call and charge nothing. Ten minutes on the phone against an offence with no enforcement deadline is not a hard trade.
Two more owners
Whose wall it is, and what your street adds on top
Planning is one of three things that can stop a garden wall job. The other two are the neighbour and the street.
A wall astride the boundary is a party fence wall
If the wall stands on the boundary line itself, it is a party fence wall and work to it is notifiable under the Party Wall etc. Act 1996. If it stands wholly on your land it is not, however much a neighbour leans on it. A wooden fence is not a party fence wall either, so the Act does not apply to one. A party wall notice is never a substitute for planning permission, or the other way round. Notice periods, and what happens when a neighbour dissents, are in the Party Wall Act for chimneys, garden walls and extensions.
An article 4 direction can displace the height rules entirely
A council can withdraw Class A over a defined area, and the national numbers then stop applying to your street. Land in and beside a conservation area in Poole has been covered since April 1993 by a direction requiring planning permission for a gate, wall or other means of enclosure along a highway frontage. On those roads a 600mm dwarf wall is a planning application and the 1 metre allowance everybody quotes is the wrong rule. Article 4 directions and what they mean for your house shows how to check your own address free.
Next steps
What to do, in order
- Check the conservation area boundary for your address, not the street name. One side of a road is often in and the other out.
- Work out what the boundary adjoins. A highway used by vehicular traffic sets the limit at 1 metre wherever that boundary sits.
- Measure the fall along the line of the wall, and step it in bays if the ground drops.
- Check for an article 4 direction, and pull up the estate's original planning permission while you are there. Either can remove the right entirely.
- If anything is coming down inside a conservation area, ring the conservation team before the tools come out, and keep the reply with the deeds.
- Settle the ownership question. Astride the boundary means a party wall notice, which runs on its own timetable, so start it early.
Then it is a bricklaying job, and two decisions govern how it ages. Matching an old wall is a question of reclaimed against new brick, and on anything solid and Victorian the mortar matters more than the brick, which is the argument in lime mortar against cement mortar. What we do on walls is on the bricklaying and repointing page.
If you want somebody to look at the wall, Thomas comes out himself and puts in writing what he found, including whether the council needs asking first. The site visit and the written itemised quote are both free, so you can ask for one first. This page explains the general position in England and is an explainer, not legal advice. Confirm your own case with your local planning authority before work starts.
Questions
Common questions
How high can I build a garden wall without planning permission?
Up to 1 metre above ground level where the wall is next to a highway used by vehicular traffic, or its footpath, and up to 2 metres above ground level in any other case. Those limits come from Class A of Part 2 of the General Permitted Development Order. They do not apply within the curtilage of a listed building, or where the wall surrounds one.
Do I need planning permission to demolish a garden wall?
Not outside a conservation area: the Demolition Direction 2021 says demolishing the whole or any part of any wall or other means of enclosure is not development, so there is nothing to apply for. Inside a conservation area that exclusion is lifted with no height threshold, and demolition then needs planning permission.
Is the height rule really 1 metre at the front and 2 metres at the back?
No, that is shorthand rather than the rule. The 1 metre limit applies wherever the wall is adjacent to a highway used by vehicular traffic. A rear boundary onto a vehicular back lane takes 1 metre, and a front boundary onto a pedestrian-only path takes 2 metres.
Where is the height of a garden wall measured from?
From ground level at the base of the wall. On a sloping plot the low end of a level-topped wall is the point that gets measured, so the usual answer is to step the wall down the slope in bays. Building the ground up behind the wall does not change the level it is measured from.
What happens if a wall was demolished without permission years ago?
In a conservation area it stays enforceable. Section 171B(2A) of the Town and Country Planning Act 1990 says there is no restriction on when enforcement action may be taken over relevant demolition, so the immunity periods that protect other planning breaches never begin. It commonly comes to light during a conveyancing search.
Read next
Related advice
The guides below pick up where this one leaves off, and the bricklaying and repointing page covers the work itself and the places we cover, if you would rather have the job looked at.
- The Party Wall Act for chimneys, garden walls and extensions
- Re-roofing in a conservation area: what actually changes
- Article 4 directions and what they mean for your house
- Planning permission, building regulations and listed building consent: which one you actually need
Bricklaying and repointing, 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
Building a wall, or taking one down? Get it looked at first
Thomas comes out himself, measures the fall along the boundary, tells you which height limit your boundary actually takes and puts it in writing. The site visit and the written itemised quote are both free.