Demolition in a conservation area and the consent needed

Since October 2013 there has been no such thing as conservation area consent in England. The Enterprise and Regulatory Reform Act 2013 abolished it and folded demolition of an unlisted building in a conservation area into the planning system, where it is now called relevant demolition and needs planning permission. The practical effect is that you apply on a planning application form, but the criminal offence that went with the old regime came across with it.

That last point is what makes this worth getting right. Demolishing a building in a conservation area without permission is a criminal offence, not a matter to be regularised with a retrospective application and a fee.

Why demolition needs permission here

Outside a conservation area, demolition of most buildings is either not development at all or is permitted development subject to a prior approval covering the method of demolition and the restoration of the site. Inside one, that route is closed for buildings the legislation catches.

The reason is the statutory duty in section 72 of the Planning (Listed Buildings and Conservation Areas) Act 1990, which requires special attention to be paid to preserving or enhancing the character or appearance of a conservation area. A demolition permanently removes a component of that character, and national policy treats the loss of a building that makes a positive contribution in the same way as substantial harm to a designated asset.

So the test is not simply whether the building is attractive. It is whether it contributes to the character or appearance of the area, and what would replace it.

The threshold for relevant demolition

Relevant demolition means demolition of a building in a conservation area, subject to exclusions set out in a Direction made by the Secretary of State describing buildings whose demolition is not caught.

The excluded categories have long included small buildings below a stated volume, and gates, walls, fences and other means of enclosure below stated heights, with a lower height threshold where the structure abuts a highway, waterway or open space. The Direction has been remade more than once, so check which version is currently in force and read the categories in it rather than relying on remembered figures.

Two practical points follow. A garden wall in a conservation area can be caught where it exceeds the threshold, and owners demolish them routinely without realising. And the volume threshold applies to the building, so a small outbuilding may fall outside while the modest house next to it does not.

If you are unsure whether a structure is caught, the safe route is a written enquiry to the council before anything is touched.

Partial demolition and what counts

This is where most of the difficulty sits. Removing part of a building can be demolition, or it can be alteration, and the answer affects which consent you need.

The courts have drawn the line by asking whether what is proposed amounts to demolition of a building, as opposed to works of alteration to a building that remains. Taking down a rear wing while retaining the main house is usually treated as alteration. Taking down everything except a façade is usually treated as demolition however the drawings describe it.

Façade retention schemes are the classic argument. Councils are generally unpersuaded by a description of substantial demolition behind a retained frontage as alteration, and they will assess the proposal on what is actually being removed.

The safe approach on any substantial scheme is to apply for planning permission covering the whole proposal, including the demolition, and to say plainly in the application what is being taken down. Ambiguity about the extent of demolition is a common reason for a permission to be unimplementable as drawn.

Evidence of condition and viability

Where the case for demolition rests on the state of the building, the evidence has to be capable of being tested.

A Structural Survey by a suitably qualified engineer, setting out the defects, their causes and the repair options with an indication of what repair would involve, is the starting point. Councils expect a suitably qualified author for this and professional review is strongly advised, because a survey that concludes demolition is the only option without costing repair will not carry weight.

Where the case is that repair is not viable, the evidence needs to show the cost of repair, the value of the building after repair, the value of the site cleared and the returns available. That comparison has to be presented in a form the council can examine, and councils increasingly instruct their own advisers to review it.

One caution that applies everywhere. Deliberate neglect is not a route to consent. Where a building has been allowed to deteriorate by an owner who then argues that it is beyond repair, the argument carries little weight, and the authority has powers to serve notices requiring repair. The routes available are covered in heritage at risk grants, repairs notices and urgent works.

The replacement scheme as part of the case

National policy is clear that consent for demolition should not be given without acceptable proposals for what follows, and councils apply that strictly.

In practice that means a demolition-only application for a building making a positive contribution is very unlikely to succeed. The workable approach is a single application covering demolition and the replacement scheme, so that the decision-maker can weigh the loss against what is proposed in its place.

Where the replacement scheme will take time to come forward, the tool councils use is a condition preventing demolition until a contract for the redevelopment has been entered into and the necessary permissions are in place. Expect that condition and design the programme around it, because the alternative is a cleared site that stays cleared.

Present the two together in the Heritage Statement: the contribution the existing building makes, the harm its loss would cause, and the character and quality of what replaces it.

The offence and the criminal risk

Carrying out relevant demolition without planning permission is an offence, and the penalties are severe. Liability is not limited to the owner: a contractor who carries out the work can be prosecuted too, which is why demolition contractors working in historic areas ask to see the permission before they mobilise.

Two situations produce most of the prosecutions. An owner demolishes a structure believing it falls within an excluded category, and it does not. And a contractor removes more than the permission allowed, usually because the drawings did not make the extent clear.

Both are avoidable with paperwork. Confirm the position in writing before work starts, mark the extent of demolition unambiguously on the approved drawings, and give the contractor a copy of the permission and the approved plans rather than a verbal instruction.

What to submit

An application covering demolition in a conservation area should normally include:

1. Existing and proposed plans and elevations showing exactly what is removed and what is retained.
2. A heritage assessment covering the contribution the building makes to the character or appearance of the area.
3. Photographs of the building and its context, including its relationship with neighbouring buildings.
4. Structural and condition evidence where the case relies on it, with repair options costed.
5. A demolition method statement, including site protection, hoarding and the treatment of party walls.
6. The replacement scheme in full, unless there is a compelling reason for demolition alone.
7. A recording proposal where the building has historic interest, which may follow a recognised recording level.

That last item is often required by condition in any event, and dealing with it in the application is faster than discharging it afterwards. The scope of that work is set out in recording a building before demolition or conversion.

This is general guidance, not legal advice. Check the position with your local planning authority or a qualified professional before relying on it.

Enter your postcode on PlanScope to see which documents a demolition and redevelopment scheme is likely to need.

PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.