Extensions
planning Check.
Planning constraints, local approval history, property restrictions and nearby extension applications — giving you an evidence-based view of your property's extension potential before you speak to an architect or builder.
Run a planning check
Analyses planning history, approval rates, refusals and nearby developments UK-wide via UK PlanIt's 400+ council portals. Statutory constraint checks (flood, listed, conservation, green belt, Article 4, TPO…) are England only, from the government platform.
Your project:
Filtered to your project typeSummaryCombined?The headline read across everything: constraints at this site, how the council treats applications in this area, plus your project type if selected.
Constraint checksThis site?Statutory designations at this exact address (flood zone, listed building, conservation area, green belt…). They apply to the property itself, whatever you build.
Application historyThis area?Every planning application near this address, of all types — use it to judge how the council behaves generally. Your specific project type is broken out at the top.
How this is calculated & caveats
Planning history — in depthThis area?A deeper breakdown of all nearby applications: decisions by year, application types, conditions, appeals and withdrawals. Click a year or type to drill in.
Decisions by year — click a year to see its applications
Application types — click to filter
Conditions activity
Appeals & withdrawals
Applications nearest this address
Live applications — awaiting decisionThis area?Applications nearby that are submitted but not yet decided, of all types. Neighbours can usually still comment; for the trades these are jobs about to start.
In-flight applications nearby.
Refused applications — what didn't get throughThis area?Refusals found nearby, including ones uncovered from resubmission records. Refusals are the strongest predictor of what a council will reject.
Major developments in the areaThis area?Large-scale schemes nearby with their distance from this address. Worth knowing before buying, designing or investing.
Large-scale proposals detected nearby.
Extension Planning Checker
Check the planning potential of your house extension
Planning an extension? Before speaking to an architect or starting your plans, check the planning picture around your property.
Enter your address to explore planning constraints, previous applications, nearby extensions and local planning decisions using government open data.
Planning permission for an extension
Whether you’re considering a rear extension, side extension, two-storey extension or another addition to your home, understanding the planning position early can save time and money.
Some extensions may fall under permitted development rights, while others may require planning permission. The rules depend on the property, the proposed development and any restrictions affecting the site.
Check your property's extension history
Previous planning applications can provide useful insight into what has happened at your property and how similar proposals have been treated nearby.
Search your address to investigate:
- Previous extension applications
- Approved and refused applications
- Planning decisions
- Nearby extensions
- Local planning activity
- Relevant planning constraints
Search extensions on your street
Your property’s history is only part of the picture. Looking at planning applications on neighbouring properties can help you understand how similar extensions have been considered locally.
See examples of:
- Rear extensions
- Side extensions
- Single-storey extensions
- Two-storey extensions
- Loft conversions
- Garage conversions
Previous approvals don’t guarantee your application will be successful, but they can provide useful local planning context.
Can I extend my house?
Whether you can extend your house depends on the property and your proposed development. Some work may be possible under permitted development, while other projects require planning permission.
Our extension planning checker helps you research the property before deciding what to do next.
Check planning constraints
Location-specific restrictions can affect your plans. Depending on the property, these can include conservation areas, listed buildings, heritage constraints and other planning designations.
Checking these before developing your plans can help identify potential issues early.
Why check before planning an extension?
Instead of spending hours searching council planning portals, enter your address and investigate the planning history around your property in seconds.
Check your house, explore your street and understand the planning picture before you start your extension.