Conservation Areas.
Areas of special architectural or historic interest where the character must be preserved or enhanced. Designation doesn’t stop development — but it raises the bar, removes permitted-development rights, and gives objectors a statutory hook.
- Sympathetic alterations matching the prevailing character
- Like-for-like repair and reinstatement
- High-quality contemporary infill that respects scale
- Internal works (no external impact)
- Extensions visible from the street
- Changes to windows, doors, roofing materials
- Demolition (conservation-area consent required)
- Hard-standing, boundary treatments, shopfronts
- Often withdrawn by an Article 4 Direction
- Cladding, satellite dishes, some extensions restricted
- Tree works require 6 weeks’ notice
- Check the specific Article 4 for the area
A conservation area is designated by the local planning authority under s.69 of the 1990 Act. Once designated, the authority has a statutory duty under s.72 to pay "special attention to the desirability of preserving or enhancing the character or appearance" of the area when determining applications.
Designation doesn’t prohibit development, but it changes the test: harm to the character of the area must be weighed, and under NPPF the duty is to give "great weight" to the conservation of a designated heritage asset — even where the harm is less than substantial. It also commonly triggers an Article 4 Direction removing permitted-development rights, so works that would be permitted elsewhere need full consent.
Conservation-area status is a design conversation, not a veto. The areas that actually move outcomes are a minority — the map shows which ones concentrate objections and refusals, so you can calibrate effort to the area rather than treat every CA the same.
The single biggest lever is a credible character appraisal plus early conservation-officer engagement. A scheme that demonstrably responds to the area’s appraisal is read very differently from one that merely avoids obvious harm.
How schemes actually fare inside this designation — approval rates, appeal survival, which authorities apply it hardest — needs the designation joined to the decision record. That join isn’t built, so those figures aren’t published here. We won’t estimate them.
The Atlas maps every London conservation-area boundary against INSPIRE parcels. Check whether your site sits inside one — and how that specific area’s applications have fared.