How to find out if land is green belt

Green belt is one of the most restrictive planning designations in England. If you are buying land, thinking about an extension, or looking at development potential, you need to know whether it applies. Here is how to check.

This guide is about England. Wales has no green belt in the way England does, so we do not check for it there. In Scotland, green belt is set by each council's local development plan.

Method 1: Check the site with Planning Constraints

Check a site free shows which council covers the site and whether it is in a conservation area. The green belt check is part of the site report (£9.99, one-off), which covers everything we can check within 500 m of your pin, for 30 days. The report link never expires.

Open the site checker
Search for the postcode, address or coordinates
Review the free result, then open the site report for the green belt check
Review the green belt boundary and its source

In England, the boundaries come from the Government's annual green belt returns, published through planning.data.gov.uk. That is a snapshot and does not reflect changes made since the latest return, so check your council's local plan too. We show what we found, what came back clear, and where a source couldn't be checked. Some councils don't publish every dataset, so ask the council where it matters.

Method 2: Check the local plan policies map

Every council publishes a policies map (sometimes called a proposals map) as part of its local plan. It shows green belt boundaries along with other planning designations. Search for "[your council name] policies map".

The council's map is the version used to make planning decisions. It may also show changes the council proposes in a draft or emerging local plan.

Method 3: Local authority search

If you are buying, the local authority search (CON29) your solicitor orders after your offer is accepted should confirm whether the property is in the green belt. If the answer would change your offer, check earlier. Planning Constraints is not a CON29.

What does green belt mean for your property?

Green belt is a planning policy tool to prevent urban sprawl. It does not mean the land is beautiful or environmentally valuable. It means development is tightly restricted to keep land open.

The general rule

Under the National Planning Policy Framework (NPPF), republished on 17 August 2026, new development in the green belt is "inappropriate" unless it falls within one of the categories in policy GB7. Inappropriate development should be approved only in "very special circumstances", a high bar that is rarely met for ordinary proposals (policy GB6).

What you can do

Several types of development are not inappropriate in the green belt:

Extensions, provided they are not disproportionate to the original building (as it stood on 1 July 1948, or as built if later). Councils differ on what is disproportionate, and some set percentage guides
Replacement buildings, provided they are in the same use and not materially larger
Agricultural and forestry buildings
Outdoor sport and recreation facilities that preserve openness
Redevelopment of previously developed land that does not cause substantial harm to openness
Grey belt development that meets the conditions in GB7(g), a category added to the NPPF in December 2024 and kept in 2026

What you generally can't do

Build a new house on undeveloped green belt land, unless it fits an exception such as limited infilling in a village or grey belt development, or you can show very special circumstances
Significantly enlarge a property beyond what is proportionate
Develop in a way that substantially reduces openness

Extensions specifically

Homeowners can extend in the green belt, but there is a "disproportionate additions" test. If the cumulative size of all extensions, including those previous owners added, is more than the council considers proportionate to the original building, the application will probably be refused.

Check your council's policy. Some publish supplementary guidance on green belt extensions. Pre-application advice from the council is worth paying for before you commission drawings.

Can green belt boundaries change?

Yes, but only through the local plan process, and only where exceptional circumstances are fully evidenced and justified (policy GB3). Councils typically need to show they have used previously developed land, optimised density and tested sites outside the green belt first.

Green belt reviews have become more common as housing need has grown. If you are looking at land near the edge of the green belt, check whether the council's emerging local plan proposes changes to the boundary.

Summary

Three ways to check whether land is in the green belt:

Site report: check a site free, then open the £9.99 site report for the green belt check
Most detail: your council's local plan policies map
During a purchase: the local authority search your solicitor orders

Green belt is a strong constraint but not an absolute ban. Extensions, replacements and agricultural buildings can be acceptable. The key question is whether the proposal fits a GB7 category and preserves openness. Read the full guide to green belt and planning permission.