Solar farms and agricultural land grade: the sequential case

Solar farm agricultural land classification evidence is the part of the application that decides how the officer frames the report. National policy expects the economic and other benefits of the best and most versatile agricultural land to be taken into account, and where development of agricultural land is shown to be necessary, expects areas of poorer quality land to be used in preference to higher quality land. That is a policy preference rather than a statutory sequential test, and the difference matters when you write the case.

Policy expectations on land quality

Agricultural land in England is graded 1 to 5, with grade 3 split into subgrades 3a and 3b. Grades 1, 2 and 3a together form the best and most versatile category, and it is that category the policy protects. Grade 3b, 4 and 5 land attracts no equivalent protection.

The National Planning Policy Framework (August 2026 edition) is the starting point, read with the authority's own development plan policies on renewable energy and on the countryside. Successive written ministerial statements have also addressed solar generation on farmland, and the position has been revisited more than once, so check the current statements on gov.uk at the point you write rather than relying on a quotation in an older appeal decision.

Consent route matters too. Larger schemes are determined as nationally significant infrastructure projects under the Planning Act 2008 rather than by the local planning authority, and the capacity threshold for solar in England has been revised, so confirm the current figure before assuming which route applies.

What the policy does not say is that best and most versatile land cannot be developed. It says the quality of the land is a consideration to be weighed, and weighing requires evidence about what the land actually is.

Predictive maps against field survey

The provisional agricultural land classification mapping produced in the late 1960s and 1970s covers the whole of England at a coarse scale and does not split grade 3. A site shown as grade 3 on that mapping might be 3a, 3b, or a mixture, and the difference is the difference between best and most versatile land and ordinary farmland.

Natural England also publishes a predictive dataset indicating the likelihood of best and most versatile land, derived from soil, climate and terrain data. It is a screening tool. It is not a survey, and presenting it as one invites a consultee to say so.

For any scheme of scale on land that might be grade 3, commission a field survey. The provisional mapping is useful at option stage to compare candidate sites, and useless as the evidence base for a decision.

An illustrative case makes the point. A 40 hectare site shown wholly as grade 3 provisionally comes back from survey as 12 hectares of 3a on the free-draining upper slopes and 28 hectares of 3b on the heavier clay below. That single distinction changes the quantum of best and most versatile land lost from 40 hectares to 12, and it changes the officer's recommendation. The figures are illustrative.

Undertaking a survey and its season

Field survey follows the revised guidelines and criteria for grading the quality of agricultural land published by the agriculture ministry in 1988, which remain the operative standard.

The method is soil observation on a grid, typically one auger boring per hectare on a regular pattern, supplemented by soil pits at a lower density to examine profile, structure and depth. The surveyor records texture, stoniness, depth, wetness class, gley features and slope, and combines those with climate data for the site, principally average annual rainfall, accumulated temperature, field capacity days and moisture deficits, to derive the limitation that fixes the grade.

Timing is practical rather than regulatory. Surveys can be carried out through the year, but not when the ground is frozen, waterlogged or under a standing crop that prevents access. Late summer after harvest and early autumn are the easiest windows on arable land, and a wet winter survey risks both poor access and disputes about whether observed wetness reflects the season or the soil.

Commission an Agricultural Land Classification report from a surveyor with soil science experience. Councils expect a suitably qualified author for this work and professional review of any draft is strongly advised.

Demonstrating that poorer land was considered

This is the section most applications get wrong, usually by asserting a conclusion rather than showing a process.

Set out the site selection exercise in order:

1. The search area, defined by the grid connection opportunity rather than by administrative boundary, with the point of connection and its available capacity identified.
2. The technical filters applied: irradiance, slope and aspect, distance to the connection point, and the minimum contiguous area needed for the scheme.
3. The environmental and heritage filters: designated landscapes, heritage assets and their settings, flood zones, ecological designations, public rights of way and residential proximity.
4. The land quality filter, applied using the predictive and provisional data across the whole search area.
5. The sites that survived each stage, with the reasons the rejected ones failed, including any that were lower grade but unavailable, undeliverable or constrained on other grounds.
6. The conclusion, expressed as the area of best and most versatile land affected in hectares and by grade.

Land availability is a legitimate reason a lower grade site was not pursued, and it is much more persuasive when documented with dates and evidence of approach than when asserted in a sentence. The grid connection constraint is usually the strongest argument available, because it is verifiable and outside the developer's control.

Cover the same ground in the Planning Statement so a member reading only that document sees the logic.

Reversibility and soil protection

The temporary nature of a solar farm carries real weight, and the application should evidence it rather than assert it.

Frames are usually pile-driven rather than set in concrete, foundations are limited to substations, storage compounds and access tracks, and the land beneath and between rows stays in vegetative cover. Decommissioning and restoration can be secured by condition or obligation, with a scheme to be approved before the end of the permitted period and a bond or equivalent where the authority asks for one.

Soil protection during construction is where reversibility is won or lost. Include a soil management plan setting out trafficking routes and matting, the conditions under which earthworks stop, topsoil handling and storage where any is stripped, decompaction on completion, and monitoring. The published construction code of practice for the sustainable use of soils on construction sites is the reference point.

State the position at the end plainly: the land grade is not permanently lost, because soil structure recovers where it has been protected, and the site can return to arable production after decommissioning.

Coexistence with grazing and biodiversity

Agricultural use frequently continues. Sheep grazing between and beneath rows is common practice, and where it happens the land remains in agricultural production rather than being taken out of it.

That argument is stronger when the scheme is designed for it: row spacing and panel clearance that allow stock to move and graze, gates and handling arrangements, water provision, and a grazing agreement with a named farmer rather than an aspiration.

Biodiversity delivery sits alongside. Sown species-rich grassland under the arrays, new and reinforced hedgerows on the boundaries, margins and beetle banks all count towards the biodiversity gain requirement, and thirty-year management for net gain fits neatly with the operational life of the scheme. Landscape planting serves the visual case at the same time, and where the site is prominent a Landscape and Visual Impact Assessment will be required in any event.

Where the site sits over a mineral safeguarding area, check the separate policy position set out in our note on mineral and waste safeguarding on farmland, because a temporary surface use above safeguarded reserves raises its own questions.

How the argument is presented at committee

Members respond to quantities, not adjectives. Give them the hectares by grade, the percentage of the holding and of the parish that represents where you can source it, the period of the permission, and the restoration commitment.

Then set out the balance honestly. Loss of best and most versatile land for a defined period, against renewable generation capacity, biodiversity gain, continued grazing and full restoration. Do not claim the land is being improved, and do not describe grade 3a as poor land, because somebody in the room will know it is not.

The strongest solar cases share a shape: a documented search that shows poorer land was looked for, a field survey that establishes what the land really is, a design that keeps it in agricultural use, and a restoration commitment with teeth. The weakest ones lead with carbon savings and mention soil in an appendix.

To see which supporting documents a solar scheme is likely to need, enter your postcode on PlanScope and run the constraint check before you take an option.

This is general guidance, not legal advice. Check the position with your local planning authority or a qualified professional before relying on it. PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.