National Planning Policy Framework (NPPF) & Agricultural Land Classification (ALC)
Agricultural Land Classification (ALC) Update – March 2026
Natural England has prepared an updated Agricultural Land Classification (ALC) Predicted Grade Map, intended to replace the previous Provisional ALC maps. This update includes improved modelling of agricultural land quality across England and, importantly, a clearer distinction between Grade 3a (Best and Most Versatile land) and Grade 3b.
The mapping provides a national-scale, modelled dataset designed to support early-stage planning and land-use considerations. It is expected to become more visible in planning discussions, particularly in relation to renewable energy projects and strategic-scale development, where understanding agricultural land quality is a key policy requirement under the National Planning Policy Framework (NPPF).
Role of the Predicted ALC Map in Planning
The updated map is intended to act as a strategic planning tool, rather than a replacement for site-specific assessment. As a modelled dataset, it indicates the likely distribution of ALC grades, but does not account for localised soil variation that can only be confirmed through field survey.
In practice, the mapping is likely to influence how planning authorities approach agricultural land considerations:
Where land is predicted to be Best and Most Versatile (Grades 1, 2 or 3a), there is a stronger basis for requesting detailed ALC survey evidence to support planning applications.
Where land is predicted to be non-BMV (Grade 3b or lower), the need for detailed survey work may be reduced, depending on the scale and nature of the proposal.
This reflects the NPPF requirement for proportionate evidence while ensuring that higher quality agricultural land is appropriately considered in decision-making.
Relationship with Planning Policy
The NPPF requires that planning decisions take into account the economic and environmental value of agricultural land, with a preference for using lower quality land where significant development is necessary.
The updated ALC mapping provides an additional layer of information to support this process. However, its role remains contextual, it should be considered alongside:
Site-specific evidence
Planning balance and land use need
Other environmental and policy constraint
Key Considerations for Developers and LPAs
The updated map is likely to be used increasingly at screening and validation stages of planning.
It may influence when ALC surveys are requested, particularly for larger or policy-sensitive sites.
The distinction between Grades 3a and 3b is significant, as only Grade 3a falls within the definition of BMV land.
As with previous mapping, site-specific surveys remain the definitive method for determining ALC grade where required.
A similar approach to predictive mapping has been in place in Wales for several years, where it has been used effectively to focus attention on potential BMV land and guide proportionate evidence requirements.
Ongoing Application
As the updated ALC Predicted Grade Map becomes established in practice, its influence will depend on how it is applied by planning authorities and interpreted alongside policy. Its introduction adds further detail to how agricultural land is understood within the planning system, particularly where development, food production and environmental priorities intersect.