Conservation Areas
What it is
Conservation Areas are areas of special architectural or historic interest whose character it is desirable to preserve or enhance, designated under the Planning (Listed Buildings and Conservation Areas) Act 1990 (s.69). There are roughly 10,000 in England — every local authority has at least one.
This profile exists mainly to correct a widespread misconception:
Conservation Areas are designated by local planning authorities, not by Historic England — even though Historic England compiles the national dataset. This is the opposite of Scheduled Monuments and Listed Buildings, which Historic England designates.
How it's produced
Each Conservation Area is designated by its LPA. Historic England compiles a national spatial dataset from what LPAs supply — but it is an aggregation of locally-designated boundaries, not a Historic England designation.
Update frequency & currency
Updated as LPAs supply new or amended designations to Historic England.
Spatial resolution / precision
Boundaries reflect each LPA's designation. The critical limitation is completeness, not precision (see below).
Known limitations
- The national dataset is materially incomplete. Because it depends on LPAs supplying data (under a memorandum of agreement), the compiled national layer has real gaps — a portion of LPAs are omitted and a further significant share have not granted permission to publish their boundaries. A site can sit in a designated Conservation Area that the national dataset doesn't show.
- The LPA is the authoritative source. For any specific site, the LPA's own records — not the national compilation — are definitive.
- Heritage, not habitat. A planning constraint, not habitat evidence.
How it compares to Scheduled Monuments and Listed Buildings
All three are heritage designations, but the designating authority differs — and that's the point:
| Designated by | Compiled/held by | National data completeness | |
|---|---|---|---|
| Scheduled Monuments | Secretary of State / Historic England | Historic England (NHLE) | Authoritative |
| Listed Buildings | Historic England | Historic England (NHLE) | Authoritative |
| Conservation Areas | Local planning authorities | Historic England (compiled) | Known to be incomplete |
Role in BNG assessment
Not currently in WildStack's ingested stack — Conservation Areas are a known gap, precisely because there is no complete, authoritative national dataset. Where a Conservation Area is relevant, the LPA's records are the source of truth. It is a planning constraint, not a habitat input.
Conservation Areas are our favourite worked example of "who actually designated this?" mattering. Almost everyone assumes they're Historic England data because Historic England hosts the national layer — but they're an LPA power, and the national dataset is openly, knowably incomplete: some authorities aren't in it, others haven't permitted publication. That combination is a trap. Rely on the national layer as if it were authoritative and you will miss designated areas. Our position is deliberately cautious: we treat the absence of a Conservation Area in any national dataset as "unconfirmed", not "not designated", and we point users to the LPA. It's a small point that quietly prevents a real class of error.
Official source
- Conservation Areas — Historic England open data
- Conservation area dataset — Planning Data (planning.data.gov.uk)
Last reviewed
5 July 2026. Revisit if a more complete national Conservation Areas dataset becomes available, or if the designation framework changes. Reconfirm the completeness figures against the current dataset notes at review.