Next Door Notice
A geospatial monitoring platform that watches every planning application in London and tells people when one lands near them.
Visit www.nextdoornotice.co.ukThe problem
Planning applications are public, but publicly available is not the same as usable. Each local authority publishes on its own portal, in its own format, on its own schedule. If you want to know what is being built near a specific address — as a resident, a developer, or a surveyor — the honest answer is that you have to check dozens of sites manually, forever, and you will still miss things inside the consultation window that matters.
What we built
- 01
Scheduled ingestion adapters per planning authority, normalising wildly inconsistent source formats into one canonical application model.
- 02
PostGIS-backed spatial queries so proximity search is a real geospatial operation rather than a postcode string match.
- 03
Watchlists tied to geocoded addresses with a configurable radius, driving email alerts as new applications appear.
- 04
An interactive map interface for exploring applications by area, status, and type.
- 05
The entire market layer factored into configuration, so a second country becomes a data adapter and a config file rather than a fork.
Decisions worth noting
Market-agnostic core
The product is built as a base template with market-specific configuration. That decision is what made an Ireland expansion — different data authority, different coordinate system, different legal entity — an adapter rather than a rewrite.
Coordinate system handling
Source datasets publish in national grid projections that have to be converted to WGS84 on ingest, with a geocoding fallback for records that arrive without usable coordinates.
Fail-closed billing
Subscription webhooks are handled fail-closed: an unverified or ambiguous billing event never silently grants access. Entitlement errors resolve toward denying, not granting.
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Tell us what is slowing you down
A short conversation is usually enough to tell whether this is a build, an automation, or something you should not do at all. We will tell you which.