The London Green Belt is a strategic planning policy for containing urban growth and protecting open land around Greater London. The idea was proposed by Raymond Unwin in 1935 and was subsequently incorporated into post-war planning policy following the 1947 Town and Country Planning Act. The Green Belt restricts development across a broad area surrounding London, helping to maintain open countryside, agricultural land and recreational landscapes while directing urban growth towards existing settlements.
Policy premises
- Urban containment: Restricting development around London was intended to prevent continuous outward expansion and maintain separation between settlements.
- Protection of open land: Agricultural land, countryside and areas of landscape value are retained within the Green Belt.
- Access to green space: The policy also supports the provision and accessibility of open landscapes for recreation.
- Compact urban growth: Development pressures are directed towards existing urban areas and settlements within the broader metropolitan region.
Soil-related interventions
- Protection of agricultural soils: Restricting development helps retain agricultural land and its associated soils outside the built-up area.
- Prevention of soil sealing: Limiting urban expansion reduces the conversion of open and agricultural land to built surfaces.
- Maintenance of open landscapes: Keeping land undeveloped preserves soil functions associated with agricultural production, vegetation and water infiltration.
- Spatial containment: The delineation of a development-restricted area creates a long-term spatial boundary that limits irreversible land-use conversion.
Planning relevance
- Demonstrates how urban containment can indirectly protect soil through the preservation of open and agricultural land.
- Shows the long-term influence of a strategic regional boundary on patterns of urbanisation and land-use change.
- Illustrates the multiple functions that protected open land can perform, combining agriculture, recreation, landscape and environmental functions.
- Provides an influential example of regional-scale land-use regulation, while also raising questions about the relationship between land protection, housing demand and development pressure.