Can You Get Planning Permission Outside a Settlement Boundary?
Can you get planning permission outside a settlement boundary? Discover the key opportunities, including housing supply, Green Belt, grey belt, self-build, brownfield and rural development.
PLANNING APPLICATIONS
Andrew Ransome
8/20/20269 min read
Can you get planning permission for development outside a settlement boundary?
The short answer is still yes.
However, development outside a defined settlement boundary can be more challenging because local planning policies often seek to direct new development towards existing towns and villages and restrict development in the countryside.
That does not mean that development outside a settlement boundary is automatically unacceptable.
Under the National Planning Policy Framework published in August 2026, the position is now set out far more explicitly than before.
Rather than relying solely on a general planning balance, the NPPF now contains a defined list of the forms of development that are, and are not, acceptable outside settlements. Understanding that list is now the starting point for assessing any site in the countryside.
What is a Settlement Boundary?
A settlement boundary is a line shown on a local planning authority's policies map which generally defines the built-up area of a town or village.
Planning policies will often seek to focus new housing and other forms of development within these boundaries, and land outside the boundary is generally treated as countryside, where development is more restricted.
However, a settlement boundary is not an absolute line beyond which development cannot take place.
The first step in assessing a site is to understand exactly what the relevant local planning policy says, and then to test the proposal against the national policy framework that now applies specifically to land outside settlements.
The New Framework: Policy S3 and Policy S5
The August 2026 NPPF restructures the presumption in favour of sustainable development.
Policy S3 confirms that decisions on development proposals should apply a presumption in favour of sustainable development, and that this presumption operates differently depending on whether the site is inside or outside a settlement.
Where a proposal falls within a settlement, it is tested against policy S4, which starts from the position that development should be approved unless its benefits are substantially outweighed by adverse effects.
Where a proposal falls outside a settlement, a different and more restrictive test applies under policy S5, and where a site straddles a settlement boundary, S4 and S5 are applied separately to the relevant parts of the site before an overall view is reached.
This matters because policy S5 is no longer a broad, open-ended balancing exercise.
It sets out a defined list of the forms of development that should be approved outside settlements, subject to the usual test of whether the benefits are substantially outweighed by adverse effects.
If a proposal does not fall within one of these categories, it faces a materially harder test.
The Categories of Development Permitted Outside Settlements
Under policy S5, the following forms of development should be approved outside settlements, unless their benefits would be substantially outweighed by adverse effects assessed against the NPPF's decision-making policies:
Development for agriculture, horticulture and forestry; outdoor sport and recreation; allotments; cemeteries and burial grounds; mineral extraction and processing; engineering operations and infrastructure (including transport, energy, water and telecommunications); roadside facilities; national defence and security; or development solely for nature conservation, restoration or enhancement;
Development for rural businesses and services, including tourism, where a location outside settlements is shown to be necessary;
The reuse, extension, alteration or replacement of an existing building, provided the existing building is of permanent and substantial construction, is lawful, and any extension or alteration will not result in a disproportionate increase in size compared with the existing building (assessed against the building as it existed on the date the NPPF was published). A replacement building should be for the same use and not disproportionately larger than the one it replaces;
The redevelopment of previously developed land, including a material change of use to residential or mixed use including residential;
Limited infilling within groups of houses;
An exception site under policy HO10 (see below), or development brought forward under a Community Right to Build Order or Neighbourhood Development Order;
Development addressing an evidenced unmet need for gypsy, traveller or travelling showpeople accommodation, meeting the criteria in policy HO12;
Residential and mixed-use development within reasonable walking distance of a well-connected station — a genuinely new route, discussed further below;
Development of land allocated for that purpose in the development plan, where the allocation lies outside a settlement; and
Development addressing an evidenced unmet need, including where the local planning authority cannot demonstrate a five-year supply of deliverable housing sites, or has scored below 75% on the most recent Housing Delivery Test, provided the development is physically well related to an existing settlement and of a scale that can be accommodated by existing or proposed infrastructure (or, alternatively, comprises major development for freight and logistics that accords with policy E3).
Where a proposal does not fall within any of these categories, policy S5(4) confirms it should only be approved in exceptional circumstances, where the benefits substantially outweigh the adverse effects, including effects on the character of the countryside and on sustainable patterns of movement.
This is a considerably harder hurdle than the tests applying to the listed categories, so correctly identifying which (if any) category a proposal falls within is now a critical first step in any appraisal.
It is also worth noting that policy S5 does not apply to sites in the Green Belt or on land designated as Local Green Space. Those sites are instead assessed under policies HC8, GB6, GB7 and GB8, which are discussed further below.
A New Route: Development Near Well-Connected Stations
One of the more significant changes introduced by the August 2026 NPPF is the new route for residential and mixed-use development within reasonable walking distance of a "well-connected station" — broadly, around 800 metres, or a 10-minute walk, extending further where topography or route quality would otherwise discourage walking.
To fall within this route, a proposal must:
Be within reasonable walking distance of a well-connected station, as defined in the NPPF's glossary;
Be physically well related to the station or to the settlement in which the station is located;
Be of a scale that can be accommodated given the existing or proposed availability of infrastructure; and
Not prejudice any proposals for long-term comprehensive development in the same location.
This is a potentially valuable opportunity for sites that sit just outside a settlement boundary but close to a railway station, tram stop or light rail stop with a reasonable service frequency.
Where the site also lies within the Green Belt, the equivalent route is found in policy GB7(1)(h), and where the wider development plan has identified land around a well-connected station for release, policy GB3(4) confirms that exceptional circumstances do not need to be separately demonstrated to justify altering the Green Belt boundary.
This is likely to become an increasingly important line of enquiry for landowners and promoters with sites near stations that currently sit outside settlement boundaries.
Five-Year Housing Land Supply and the Housing Delivery Test
Housing land supply remains central to the case for development outside settlements, but the August 2026 NPPF expresses this more precisely than before.
Under policy S5(1)(j), an evidenced unmet housing need — including a shortfall against the five-year housing land supply requirement, or a Housing Delivery Test score below 75% over the previous three years — can support development outside a settlement, provided the site is physically well related to an existing settlement and can be accommodated by existing or proposed infrastructure.
This is not, however, an automatic route to permission.
The proposal still needs to satisfy the general test in policy S5(1) that its benefits are not substantially outweighed by adverse effects.
Annex A of the NPPF contains an important qualification: where a local planning authority already has a demonstrable five-year supply and a satisfactory Housing Delivery Test score, an increase in the most up-to-date local housing need figure calculated using the standard method should not, of itself, be treated as evidence of unmet need for five years from the date the plan was adopted.
For this reason, checking the council's current housing land supply position, and understanding exactly how any shortfall is evidenced, remains an essential part of any early site appraisal.
Green Belt and Grey Belt
A site outside a settlement boundary may also be located within the Green Belt, and it is important to treat these as two separate planning considerations that both need to be satisfied.
Green Belt land is not covered by policy S5 at all.
Instead, it is assessed under policy GB6, which confirms that development in the Green Belt is inappropriate unless it falls within one of the categories set out in policy GB7. Those categories include, among others:
Development for agriculture, horticulture and forestry, or solely for nature conservation, restoration or enhancement;
The reuse, extension, alteration or replacement of an existing building of permanent and substantial construction, without a disproportionate increase in size;
Limited infilling in villages within the Green Belt;
Limited affordable housing for local community needs;
The redevelopment of previously developed land, where this would not cause substantial harm to openness;
Certain other forms of development, including specified infrastructure, changes of use for outdoor sport or recreation, and facilities for outdoor recreation, cemeteries and allotments, where impact on openness is minimised;
Development on grey belt land, where there is an evidenced unmet need, the location is sustainable, and the development would not fundamentally undermine the purposes of the remaining Green Belt taken together; and
Residential or mixed-use development within reasonable walking distance of a well-connected station, mirroring the route now available under policy S5(1)(h).
Grey Belt
Grey belt remains defined as land within the Green Belt comprising previously developed land, and/or other land that does not strongly contribute to the purposes of checking unrestricted sprawl, preventing towns merging, or preserving the setting of historic towns.
The August 2026 NPPF has elevated the methodology for identifying grey belt from planning practice guidance into Annex E of the NPPF itself. It sets out how local planning authorities should assess the contribution that individual parcels of land make to each of these purposes, using a strong/moderate/weak or none scale.
This is particularly relevant for sites on the edges of existing settlements, where a Green Belt parcel may make only a limited contribution to Green Belt purposes.
It is important, however, not to assume that every Green Belt site is grey belt, or that every grey belt site will automatically receive planning permission.
Where major housing development is proposed on land released from, or within, the Green Belt, the Golden Rules in policy GB8 — covering affordable housing, infrastructure contributions and accessible green space — will also need to be satisfied.
Exception Sites Under Policy HO10
Rural exception sites remain an important route for affordable housing outside settlement boundaries.
Under policy HO10, sites not already allocated for housing, and located outside settlements, should be supported where they comprise either a rural exception site providing affordable housing to meet an identified local need, or community-led development.
Unless the development plan specifies otherwise, such sites should adjoin or be physically well related to a settlement, should not involve built development greater than one hectare or 5% of the size of the existing settlement (whichever is the greater), and should include one or more types of affordable housing.
A limited proportion of market housing may be acceptable where this is essential to enable delivery of the affordable units without grant funding.
Isolated Homes in the Countryside
New isolated homes remain tightly restricted under policy HO11.
A proposal will only be supported where one or more of the following applies:
There is an essential need for a rural worker — including someone taking majority control of a farm business — to live permanently at or near their place of work;
The development would be appropriate enabling development to secure the future of a heritage asset;
The development would reuse a redundant or disused building, including securing the long-term reuse of a vacant or underused listed building;
The development would involve the subdivision of an existing residential building; or
The design is of genuinely exceptional quality, reflecting the highest standards of architecture and significantly enhancing its immediate setting.
This remains a narrow set of exceptions, and the exceptional-design route in particular should not be regarded as a general opportunity to build new homes in the countryside. It requires a truly outstanding design response, not simply an attractive one.
Other Development Options Outside a Settlement Boundary
Residential development is often the most challenging form of development outside a settlement boundary, but other types of development fall squarely within the categories permitted by policy S5, including:
Buildings supporting the development and diversification of agricultural and other rural businesses;
Outdoor sport and recreation facilities, allotments and cemeteries;
Extensions, alterations and replacement of existing buildings;
Rural tourism and business uses shown to require a countryside location;
Conversion or reuse of existing buildings, including Permitted Development routes such as Class Q for agricultural buildings; and
Engineering operations and infrastructure, including for transport, energy, water and telecommunications.
How Do I Know Whether My Site Has Development Potential?
The most important point is that being outside a settlement boundary does not automatically mean that development is impossible.
The August 2026 NPPF has, if anything, made the routes available outside settlements clearer, by setting them out as a defined list under policy S5 rather than leaving the position to a more open-ended planning balance.
That clarity cuts both ways: it is now easier to establish whether a proposal has a clear policy route, but also easier to see when it does not.
Every site is different, and there is no single policy route that will apply to every proposal.
A planning appraisal undertaken at an early stage — testing the site against policy S5, the Green Belt and grey belt policies where relevant, and the specific exception and infrastructure-related routes discussed above — can identify opportunities and constraints before significant money is spent on architects, surveys and a planning application.
If you have land outside a settlement boundary and would like to understand whether it has development potential under the new NPPF, contact me to arrange a planning appraisal.
Andrew Ransome MRTPI - Email: andrew@andrewransome.co.uk
About me
Andrew Ransome is a Planning Director and a Chartered Member of the Royal Town Planning Institute (RTPI), with more than two decades of experience in town planning.
He specialises in delivering strategic planning solutions for complex developments across both rural and urban environments, helping clients navigate planning challenges and unlock development opportunities. Connect with Andrew on Linkedin.
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