If your home is in a conservation area, you can still extend it. But the rules change — sometimes quite a lot — and assumptions that hold for an ordinary house can leave you needing a planning application you hadn't budgeted for.
This guide explains what a conservation area is, what it changes, and how to approach an extension when you live in one. It covers houses in England.
What a conservation area is
A conservation area is an area a local council has designated as having special architectural or historic interest, where the aim is to preserve or enhance its character and appearance. It isn't about protecting individual buildings (that's listing) — it's about protecting the whole area: the street pattern, the materials, the proportions, the trees, the way buildings relate to each other.
Conservation areas are common. They cover historic town and village centres, Victorian and Edwardian suburbs, former industrial areas and rural settlements, and there are many across Leicester and Leicestershire. Many people live in one without realising.
How it changes what you can build
Outside designated areas, a good deal of work can go ahead under permitted development. In a conservation area — which is one type of what the rules call "Article 2(3) land" — those rights are cut back.
In practice, this means:
- Side extensions — always need householder planning permission
- Rear extensions of more than one storey — always need planning permission
- The 6 and 8 metre prior approval route for larger single-storey rear extensions isn't available
- External cladding — applying stone, artificial stone, pebble dash, render, timber, plastic or tiles to the outside of the house isn't permitted without an application
- Roof extensions, such as a rear dormer for a loft conversion, aren't covered by permitted development at all in a conservation area, so they need planning permission (a loft conversion that stays within the existing roof, with rooflights, is a different matter — check the details)
A standard single-storey rear extension within the usual 3 metre (attached/semi-detached) or 4 metre (detached) limit can still go ahead under permitted development in a conservation area — but it's the exception, not the rule, and everything else about your house still has to qualify.
Article 4 directions: sometimes even tighter
On top of conservation area status, many councils have placed Article 4 directions on specific streets or areas. These remove further permitted development rights — it might be the right to change windows or doors, alter a front boundary wall, or even build a rear extension without an application.
An Article 4 direction can apply on its own, or alongside conservation area status. Always check for both.
Other things to know
- Trees. Trees in a conservation area are protected. If you want to cut down, prune or uproot a tree with a trunk of more than 75mm diameter (measured at 1.5m above ground), you generally have to give the council six weeks' written notice first.
- Demolition. Demolishing a building, or in some cases a wall or gate above a certain size, can need permission in a conservation area.
- Listed buildings are a separate layer. If your house is listed and in a conservation area, listed building consent is needed for almost any alteration, whatever else applies.
How to check whether you're in one
Start with your council's website — most publish a map of conservation areas, and many have an appraisal document for each one that describes what makes the area special and what the council wants to protect. You can also ask your council directly, or check the local land charges search carried out when you bought the house.
Also check for Article 4 directions in the same place. Don't assume that because you didn't hear about either when you bought, they don't apply.
Designing an extension that works in a conservation area
A conservation area doesn't mean "no". Councils approve extensions in conservation areas all the time. What they're testing is whether the proposal preserves or enhances the character of the area. The things that tend to help:
- Match or complement the existing materials. Brick, roof tiles, window proportions and details should relate to the house and to the street.
- Keep it subordinate. An extension that's clearly secondary to the original house — lower, narrower, set back — reads better than one that competes with it.
- Think about what's visible from the street and public spaces. A rear extension that can't be seen from the public realm is usually far easier than a side extension that changes the street frontage.
- Respect the rhythm of the street. Gaps between houses, roof lines and building lines can all be part of what the area is protecting.
- Be proportionate on size. A modest, well-detailed extension is easier to get through than a large one that pushes every limit.
A planning application in a conservation area often needs more supporting information than usual — for example a heritage statement or design and access statement explaining how the proposal responds to its setting. Doing that thinking early makes the drawings stronger and the application easier to determine.
Consider pre-application advice
If your project is anything other than a simple rear extension, an informal chat with the council's planning officer — or with a conservation officer — before you submit can show you what they'll be looking for. Many councils offer a paid pre-application service. It isn't binding, but it can save you from drawing something that was never going to be approved.
Where to start
The first step is always the same: find out exactly what applies to your property. If you're not sure whether your house is in a conservation area, or what that means for the extension you have in mind, get in touch — we'll check, and tell you plainly what route your project is likely to need. You can also see how our planning work runs on our planning drawings page.