Strategic Gaps, Green Wedges and Settlement Gaps

 

Strategic gap, green wedge and settlement gap sound like national planning designations. Usually they are not.

They are labels created through local planning policy to protect an open break, landscape corridor or area of land between settlements. Their purpose is commonly to prevent neighbouring places from visually or physically merging, preserve a distinct settlement pattern or protect an important green corridor.

That makes them similar in some ways to Green Belt, but the legal and policy position is very different. There is no single national definition telling every council what a strategic gap must contain or exactly what development is allowed. The starting point is always the wording of the particular adopted local plan policy.

 

What is a strategic gap?

 

A strategic gap is normally land identified in a local plan because the council considers the separation between settlements to be important to the area’s spatial strategy.

The policy may be concerned with:

• preventing settlements from coalescing
• maintaining a recognisable break between built-up areas
• protecting the separate identity or setting of villages and towns
• retaining an open landscape corridor
• directing growth to more sustainable or planned locations

Some councils use settlement gap, local gap or green wedge for a similar job. Others give those labels different functions. Never assume the name alone tells you the test.

 

Is a strategic gap the same as Green Belt?

 

No.

Green Belt is governed by a national policy framework with defined national purposes and specific rules for development.

A strategic gap is normally a local development-plan designation. Its weight comes from the adopted development plan and the evidence supporting that plan. A council cannot simply call land a strategic gap and thereby import all of the national Green Belt tests.

Equally, a site outside Green Belt is not automatically easy to develop merely because the only designation is local. Section 38(6) of the Planning and Compulsory Purchase Act 2004 requires planning decisions to be made in accordance with the development plan unless material considerations indicate otherwise. A clear and up-to-date strategic-gap policy can therefore carry substantial weight.

 

What is a green wedge?

 

Green wedges are often broader corridors of open or green land penetrating or separating urban areas. Depending on the local plan, their purpose may combine settlement separation with recreation, biodiversity, landscape, flood management or green infrastructure.

That means a green wedge can be more than a simple ‘do not merge these villages’ policy. A proposal may need to show how it affects several functions of the wedge.

For the wider network approach, see Planning Geek’s guide to green infrastructure.

 

What is a settlement gap or local gap?

 

These labels are often used for smaller or more locally important breaks between neighbouring settlements. Their purpose might be preserving visual separation, avoiding ribbon development, keeping a village distinct from a nearby town or maintaining a landscape setting.

Again, there is no national rule saying a settlement gap must be a particular width or that any reduction is automatically unacceptable. The local policy and its supporting evidence matter.

 

How should a development proposal be assessed?

 

The best analysis starts with the function of the gap rather than the colour of the designation on the policies map.

Questions often include:

• would the proposal physically reduce the distance between settlements?
• would it create a perception of coalescence even if some open land remains?
• does built development already affect the gap’s character?
• is the site visually contained, or does it form an important open view between settlements?
• would landscaping genuinely maintain separation or merely screen new development?
• does the policy protect openness generally or a more specific function?
• is the designation supported by proportionate and up-to-date evidence?

A landscape appraisal may be helpful, especially where the issue is visual separation rather than a simple distance measurement. Our pages on local landscape designations and landscape character assessment explain the related landscape evidence.

 

Can houses ever be built in a strategic gap?

 

Possibly. There is no universal national prohibition. The answer depends on the exact local policy, the development plan as a whole and any other material considerations.

Some policies resist development that would materially diminish the gap’s function but allow uses which preserve openness or separation. Others are more restrictive. Some local plans identify specific allocations within or adjacent to older gap boundaries.

Where the council cannot demonstrate an up-to-date policy basis or the development plan is being reviewed, the planning balance can also be different from a site where the designation has recently been examined and adopted.

That does not mean an old policy can simply be ignored. Age is only one factor; consistency with current national policy and the evidence behind the designation matter too.

 

What about the NPPF?

 

The NPPF does not create a national strategic-gap designation equivalent to Green Belt. It does, however, support plan-led development, sustainable patterns of growth, well-designed places and protection of valued landscapes and green infrastructure where relevant.

A local plan can therefore use a strategic-gap or green-wedge policy as part of its spatial strategy, provided the policy is justified through the plan-making process.

At application stage, the question is whether the proposal conflicts with that adopted policy and, if so, how much weight the conflict should carry in the overall planning balance.

 

Strategic gap compared with other designations

 

A parcel can fall within more than one designation, so always check the full policy map.

 

What should a landowner or applicant check?

 

1. Read the actual policy, not just the policies-map label
2. Find the evidence study explaining why the gap exists and what function each parcel performs
3. Check the local plan date and review to understand whether boundaries or policy wording are changing
4. Analyse views and settlement form from both nearby roads and wider viewpoints
5. Check overlapping constraints such as Green Belt, Local Green Space, flood risk, heritage and ecology
6. Address the policy’s purpose directly rather than arguing merely that the site is small or already partly screened

 

Key sources

 

• National Planning Policy Framework
• Planning Practice Guidance: plan-making

Conservation, Heritage & Protected Sites

 

Strategic Gaps Page Added: 28th August 2026