What a conservation area restricts.

Less than you have been told, and stranger.

Reviewed August 2026

The short answer

A conservation area does not stop you altering your house. It withdraws some permitted development rights, brings demolition and trees under control, and puts a duty on the council to preserve or enhance the character of the area. Listing is a separate thing.

In practice · Priory Terrace

An unlisted hall between listed neighbours

The clearest way to explain a conservation area is a building that is in one without being listed.

The order of work

01Separate the two regimesNot listed, but in an area, and next to listed.

02Leave the front aloneNothing proposed to the elevation the street sees.

03Put the space belowA basement adds area without adding bulk.

04Granted at committeeRecommended by officers, decided in May 2024.

A hall on Priory Terrace in central Royal Leamington Spa, inside the town's conservation area. The building itself is not listed. Its neighbours are: a Grade II* church on one side and Grade II houses on the other.

The job

Site: An unlisted hall in the Royal Leamington Spa conservation area, between listed neighbours
Role: Architect, RIBA Stages 0 to 3
Consent: Warwick District Council ref W/23/1560, granted at committee, May 2024
Outcome: A rear extension, a basement and an internal reordering, with the front elevation unchanged

That combination is the most misunderstood situation in this subject. Unlisted meant the inside was nobody's business but the owner's, so the reordering could be as thorough as the brief needed. In a conservation area meant the outside was very much everybody's business. And standing between listed buildings meant the scheme had to answer for their setting too, which is a third test again.

So the space went downwards. A basement of roughly a hundred and twenty-five square metres gave the building what it needed without putting a cubic metre where anyone could see it.

What was added above ground was made to lose the argument about prominence. The rear extension took a hipped roof rather than a gable, its eaves dropped below the existing ones, and its brick matched what was already there. The basement access was clad in timber to read as part of the boundary. The front elevation was left alone.

Officers recommended approval and the committee granted it in May 2024.

None of those moves is a style choice. A hipped roof presents less bulk to a neighbour than a gable of the same footprint, dropped eaves keep the new work visibly subordinate to the old, and matched brick removes the join as a thing anyone has to defend. Set out that way in a heritage statement, each one answers a specific sentence a case officer would otherwise have to write themselves, and a scheme that answers the officer's questions before they are asked is a scheme that gets a recommendation.

The setting of a neighbouring listed building is the test people forget, and it applies whether or not their own building is listed or even in the area. It is why the section drawing matters more than the plan on a site like this: what a committee is really being asked is what the new roofline does to the view of the church, and only a section and a street elevation answer that.

The proof

Four sites in conservation areas.

Listed and in an area · granted

A Regency terrace

An orangery to the rear of a Grade II listed house in Leamington Spa, with internal alterations, taken through both regimes at once. Two applications ran together because the work needed planning permission and listed building consent, and neither one is a substitute for the other. Both granted.

Warwick District Council refs W/24/1167 and W/24/1168/LB · 2024

One sign, two consents · granted

82A The Promenade, Cheltenham

A Grade II listed Regency building in the Cheltenham central conservation area, refurbished internally and given a single new fascia sign. That one sign needed listed building consent and advertisement consent, granted together. The building work inside a listed building is controlled; in an unlisted one it is not.

Cheltenham Borough Council ref 19/01941 · granted 13 January 2020

Demolition · consented

Combrook House

Dilapidated structures taken down in a Warwickshire village conservation area, consented separately from the extensions and new access that went in alongside them. It was granted under conservation area consent, the instrument that England replaced. The control did not go away when the name did.

Stratford-on-Avon refs 12/01770/DEM and 12/01769/FUL · 2012

Inside a listed building · granted

6 Clarence Terrace

Internal alterations, new rooflights and a replacement glass roof to a listed building in Leamington Spa, then a second consent for internal changes and an air conditioning installation. Nothing here would have needed consent on an unlisted building in the same street, which is the whole distinction.

Warwick District Council refs W/19/1705/LB and W/19/2167/LB · 2019

Every planning application we make in our own name is a matter of public record on a council register, and ours reach more than 100 planning authorities across the UK.

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The first step

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01 · Where you stand

Check whether you are actually in one

Conservation areas have hard edges and they are published, so this is a five-minute question with a definite answer. A great many people assume they are in one because the street looks old, and a great many others discover they are in one after buying somewhere that does not look old at all.

The boundary is drawn on the local planning authority's policies map, which anyone can look at for nothing, and the authority will also publish a character appraisal for each area. That appraisal is worth more than it looks: it says which buildings and features the designation exists to protect, and a scheme that answers it is arguing on the council's own terms rather than against them.

Being next to a conservation area is not the same as being in one, and the difference is real. If the boundary runs along your edge rather than around your site, the area designation does not apply to your building at all. What can still apply is the setting of the area, and the setting of any listed building near you, so the boundary settles one question rather than all of them.

Two things are worth establishing in the same sitting. Whether an Article 4 direction covers the property, because that is what decides how much of the national permitted development position survives, and directions vary street by street. And whether the building itself is listed, which is a completely separate register and a completely separate consent regime that happens to overlap here often.

Areas also change. Authorities review boundaries, extend them, and occasionally designate new ones, and a designation made after a property was bought applies to it just the same. It is worth checking the date of the appraisal at the same time as the boundary, because an appraisal written twenty years ago may describe a street that has since changed considerably, and that gap is often where an argument lives.

02 · What changes

Four things designation does

Designation changes four specific things and nothing else. Everything people fear about conservation areas comes out of these.

Effect 01

A duty on the council

In exercising its planning functions, special attention must be paid to the desirability of preserving or enhancing the character or appearance of the area. That is a statutory duty rather than a policy, and it colours every decision taken inside the boundary.

Where it bites: preserving is a low bar to clear and enhancing is not, so a neutral scheme can still be argued down.

Effect 02

Demolition needs permission

Taking down an unlisted building in a conservation area in England needs planning permission in its own right, and doing it without is a criminal offence rather than a breach. The separate consent that older guidance still names was abolished, but the control was not.

Where it bites: partial demolition counts, so removing a rear wing or a boundary wall can need permission nobody applied for.

Effect 03

Permitted development narrows

Householder rights are amended rather than removed. Cladding goes, side extensions go, rear extensions above a single storey go, and roof enlargements including dormers are not permitted at all. What remains still works on its ordinary terms.

Where it bites: an Article 4 direction can take away far more than the designation does, and it is published separately.

Effect 04

Trees come under control

Six weeks' written notice must be given before works to a tree in a conservation area, whether or not it carries a preservation order. The authority uses that window to decide whether to make one. After it, the work may be done at any point in the following two years.

Where it bites: the six weeks runs from a valid notice, so an incomplete one restarts a clock everyone assumed was running.

03 · The design

How a scheme answers an area

Once the mechanics are settled, a conservation area application is won or lost on the drawings, and the moves that work are consistent enough to be worth naming. They are all versions of the same idea: make the new work read as secondary to what is already there.

Putting accommodation where it cannot be seen is the strongest of them. A basement, a rear wing behind an existing roofline, or a space carved out of what is already enclosed all add area without adding anything to the view the designation exists to protect. That is why the hall on this page went downwards rather than upwards.

After that it is a short list. Keep the eaves of new work below the eaves of old. Hip a roof rather than gable it where bulk is the issue. Match the brick rather than contrasting with it, unless the contrast is doing real work. And leave the elevation that the street actually sees alone wherever the brief allows it, because that elevation is what the character appraisal is describing.

The counter-argument is worth stating fairly, because it is often right. National policy does not require new work in a conservation area to imitate old work, and a careful contemporary intervention can enhance an area in a way a timid pastiche never will. The difference is whether the contrast is deliberate and argued or simply what came out of the drawing. An authority will take a bold move that is explained; it will rarely take one that is not.

The document that does the explaining is the heritage statement, and it is not a formality. It sets out what the significance of the area is, what the proposal does to it, and why any harm is outweighed. A scheme with a good heritage statement and an ordinary design will usually beat a good design with a weak one, because the case officer has to write a recommendation and the statement is what they write it from.

Common questions

Conservation areas, answered

Does a conservation area stop me extending my house?

No, but it takes away three of the extension rights you would otherwise have, so more schemes need an application than elsewhere.

Householder permitted development sits in Part 1 of the permitted development order, and in a conservation area that Part is amended rather than switched off. Three restrictions bite on extensions specifically. An enlarged part may not extend beyond a side elevation wall of the original house. A rear extension of more than a single storey is not permitted. And cladding the exterior is not permitted at all. Everything else in Part 1 still applies on its ordinary terms, including the depth and height limits, so a single-storey rear extension within those limits is as available here as anywhere. What changes is that the easy answers run out sooner, and a scheme that would have been automatic on an ordinary street becomes a planning application.

Do I need permission to replace my windows?

On a house, usually not, unless an Article 4 direction has been made. On a flat, always. Check for a direction before ordering anything.

Work that only affects the interior, or that does not materially affect the external appearance of a building, is not development at all, which is why like-for-like window repair and replacement generally needs nothing. Timber to plastic is a different proposition, because the external appearance plainly changes, and it is precisely the change that conservation areas are designated to control. That is why windows are the single commonest subject of an Article 4 direction: authorities withdraw the right specifically so that replacements have to be applied for. Flats and maisonettes never had householder rights in the first place, so any external alteration to one needs permission wherever it is.

Can the front of the house be rendered or clad?

Not under permitted development. Cladding is expressly excluded in a conservation area, and the exclusion names render.

The permitted development order lists the materials caught: stone, artificial stone, pebble dash, render, timber, plastic and tiles. Cladding any part of the exterior of a house with any of them is not permitted development on conservation area land, which means an application is needed even where the same work two streets away would need nothing. It is one of the restrictions people discover after the scaffold is up. Painting is a different question and usually falls outside development altogether, although a direction can catch that too, and on a listed building any of it may need listed building consent regardless of what the area designation says.

What is an Article 4 direction?

It is a local order that withdraws a national permitted development right in a defined place, and that place can be as small as one property.

Designation on its own only narrows permitted development in the ways the order itself sets out. Where an authority wants to go further, in a place where it can show the character of the area genuinely depends on it, it makes a direction. Windows and doors, front boundary walls, roof materials, porches, hard standing and satellite dishes are the usual subjects. A direction does not ban the work: it removes the right to do it without asking, so the work becomes an application like any other. Directions are published by the authority and are the single most important thing to check before assuming anything, because two houses on the same street can sit under different ones.

Is a building in a conservation area also listed?

Almost never, and the two are completely separate. A conservation area protects a place; listing protects a particular building.

A building can be in a conservation area, listed, both, or neither, and the consequences are entirely different. Listing brings the whole building under control, inside and out, including alterations that affect its special interest, and needs listed building consent on top of any planning permission. Designation of an area brings no such control over an individual unlisted building: what it does is narrow permitted development, catch demolition, protect trees, and place a duty on the council when it decides applications. The confusion costs real money in both directions, either through applications nobody needed or through work carried out on a listed building without the consent it required.

Does designation affect what can be done inside?

Not on an unlisted building. Internal work is outside the control entirely, which surprises people who assume the opposite.

The duty a conservation area places on a council concerns the character and appearance of the area, and the inside of an unlisted building contributes to neither. So a building can be gutted, reordered, re-planned and refitted without the designation having anything to say about it, provided nothing outside changes and nothing is demolished. That is worth knowing early, because it often means the ambitious part of a project is the uncontroversial part. The exception is listing, which reaches inside, and building regulations, which apply to internal work wherever it is and are a separate approval with their own timetable.

What happens if work is done without the permission it needed?

For demolition it is a criminal offence in its own right. For everything else it is a breach that can be enforced against for ten years.

Carrying out relevant demolition in a conservation area in England without the planning permission it requires is an offence under section 196D of the Town and Country Planning Act 1990, punishable on summary conviction by imprisonment of up to twelve months or a fine, and on indictment by up to two years, with the court required to have regard to any financial benefit that resulted. Other breaches are not criminal, but enforcement action can be taken within ten years of the breach in England, a period that was raised from four years for building operations on 25 April 2024. Where work has already happened, a retrospective application is an ordinary application decided on ordinary grounds, and it is very much cheaper than an enforcement notice.

Written by

Rickett Architects

A RIBA Chartered practice, working since 1970, with more than 2,500 projects behind it. Our senior architects take projects from first survey through planning to completion, for private clients, developers and landowners across the Midlands and well beyond it.