Conservation area demolition: permission or prior approval

Demolishing an unlisted building in a conservation area needs planning permission. Conservation area consent was abolished on 1 October 2013, and the gap was filled by a defined category called relevant demolition, so conservation area demolition permission is now an ordinary planning question with a criminal sanction attached to getting it wrong. Section 196D of the Town and Country Planning Act 1990 makes it an offence to carry out relevant demolition without permission. Outside a designated area the position is different: Schedule 2 Part 11 Class B of the General Permitted Development Order 2015 grants the demolition itself and reserves only the method of demolition and the restoration of the site for prior approval.

That split is the whole answer. The rest of this is about where the boundary sits and what each route asks you to submit.

What the 2013 change actually did

The Enterprise and Regulatory Reform Act 2013 repealed the conservation area consent provisions of the Planning (Listed Buildings and Conservation Areas) Act 1990. In their place, the Town and Country Planning Act 1990 gained section 196D, which creates the offence, and the demolition of an unlisted building in a conservation area became development requiring permission in the normal way.

For a consultant this matters in three practical ways. The application is a planning application, so the fee regime, publicity and determination periods are the planning ones. The decision engages section 72 of the 1990 Act, which requires special attention to the desirability of preserving or enhancing the character or appearance of the area. And refusal carries a planning appeal to the Planning Inspectorate rather than the old listed building route.

Clients who held a pre-2013 conservation area consent sometimes assume the regime still exists. It does not, and the paperwork from that era will not help them.

Relevant demolition and the buildings it catches

Relevant demolition means the demolition of a building in a conservation area, subject to the exclusions below. It does not depend on whether the building is attractive, old or noted in an appraisal. A flat-roofed 1970s garage block in a Georgian conservation area is caught in the same way as a Victorian terrace.

Three points cause arguments:

• Partial demolition. Taking down a rear wing, a chimney stack or a boundary structure can amount to demolition of a building depending on what is left. Where the works would substantially remove a separately identifiable building, treat it as relevant demolition and apply.
• Demolition as part of a redevelopment. If the scheme as a whole is applied for and permission granted, the permission can authorise the demolition, provided the description of development says so. Descriptions that say only "erection of three dwellings" have caught people out.
• Buildings in the curtilage of a listed building. These need listed building consent as well, and that regime was untouched by the 2013 reform.

The exclusions by size and type

The Town and Country Planning (Demolition - Description of Buildings) Direction 2014 takes certain demolition outside the definition of development altogether. The two categories that come up most are buildings with a cubic content of no more than 50 cubic metres, and gates, fences, walls and other means of enclosure.

Whether a particular structure falls in those categories is a measurement question, and it is worth doing the arithmetic on a drawing rather than by eye. Cubic content is external volume, so a small outbuilding with a tall pitched roof clears 50 cubic metres faster than clients expect.

Because the sanction for getting it wrong in a conservation area is criminal rather than civil, put the question to the authority in writing before anything is touched. An email confirming that the structure is a means of enclosure, or that it measures under the threshold, costs nothing and is worth having on file.

Part 11 Class B and the prior approval that follows

Where the building is not in a conservation area, Part 11 Class B of the GPDO 2015 permits the demolition subject to conditions. The application you make is for prior approval of the method of demolition and of any proposed restoration of the site. The principle is not up for discussion, which is exactly why the route is useful.

What the authority can consider is narrow:

1. How the building will be taken down, including sequencing, plant and the protection of adjoining structures.
2. Hoardings, access and the control of dust and noise during the works.
3. What the site will look like afterwards, which in practice means hard surfacing, seeding, boundary treatment and the removal of slabs and foundations where relevant.

Class B does not apply where the building has been rendered unsafe by the action or inaction of a person with an interest in the land, and it does not apply to relevant demolition. Dangerous structure powers under the Building Act 1984 sit separately and are exercised by the building control authority, not the planning department.

The harm test when permission is needed

A relevant demolition application turns on the contribution the building makes to the character or appearance of the conservation area. The current National Planning Policy Framework, published on 17 August 2026, treats harm to a designated heritage asset through the familiar substantial and less than substantial lens, and total loss of a positive building is at the serious end of that scale.

Two evidential points decide most of these cases. First, the building's contribution has to be assessed on its own terms, not by reference to how good the replacement is. A negative or neutral contribution is arguable, and sometimes correct, but the argument has to be made with photographs, a dated history and a reading of the area's character rather than asserted.

Second, the replacement matters at the planning balance stage. Inspectors have been reluctant to accept the loss of a building that contributes to character on the strength of a scheme that might never be built, which is why demolition and rebuild are usually best applied for together, so the permission secures both.

An illustrative example: a two-storey 1950s infill shop unit in a terrace of 1840s houses, lower than its neighbours and finished in reconstituted stone. The heritage case for demolition is that the unit interrupts an otherwise continuous rhythm of door and window openings. The case against is that the terrace reads as an evolved street. Either way, the evidence is a measured elevation, a historic map regression and a photographic survey, not adjectives.

Enforcement and why the criminal offence changes behaviour

Section 196D creates an offence triable either way, with a fine and imprisonment available on conviction. That is a different animal from an enforcement notice. There is no four-year or ten-year clock to run down and no retrospective application that cures the position, because the building has gone.

Councils also hold the ordinary enforcement toolkit for the planning breach, including the power to require restoration where that is practicable. For a site owner, the practical risk is that a lender or purchaser asks the question later and the answer has to be no permission, no certificate and no way back. Where works have already started on a building you now suspect was caught, stop, take photographs of what remains and take advice the same week.

What to put in each submission

For relevant demolition, the pack is the planning one: application forms and certificates, a location plan with the building edged red, existing and proposed drawings, a demolition method note, and a heritage assessment that addresses the building's contribution to the area. A heritage assessment is the document that carries the significance argument, and the full index of planning report types shows where it sits alongside the rest of a demolition pack, and the deeper you take the evidence base the less the case rests on assertion. Where the demolition is part of a redevelopment, the description of development must mention it expressly.

For Part 11 Class B prior approval, the pack is shorter: a site plan, a method statement, a restoration plan and the notification the Order requires. Conditions on the subsequent permission often pick up the detail, and the mechanics of discharging them are covered in the note on varying and amending an approved scheme.

If a relevant demolition application is refused, the appeal is the standard planning appeal, and the route and timescales follow the same rules set out in the comparison of householder and commercial appeal routes. Put the heritage evidence in at application stage. Appeals are a poor place to start building a significance case from scratch.

Enter your postcode on PlanScope to see which reports a demolition or redevelopment site is likely to need before you commit to a route.

This is general guidance, not legal advice; check the position with your local planning authority or a qualified professional before relying on it. PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.