Planning Rules
Agricultural Land: Change of Use and Permitted Development (2025)
Changing the use of agricultural land is development that usually requires planning permission. Here’s when it does and doesn’t, and what permitted development rights apply.
⏱ 7 min read📅 Updated June 2025🏠 England only
Quick Answer
Most changes of use of agricultural land require planning permission
Changing the use of agricultural land to a non-agricultural use is a material change of use that requires planning permission in almost all cases. Agricultural to residential conversion requires either a full planning application or Class Q Prior Approval (for agricultural buildings, not open land). Agricultural to commercial use can sometimes use Class R (up to 500m² of buildings). Changing the agricultural use within the agricultural use class (e.g. from arable to grazing) is not development and doesn’t require consent. The GPDO does not permit agricultural land to be developed for housing without Prior Approval or planning permission.
When Change of Use Is Development
Not every change in how agricultural land is used constitutes “development” requiring planning permission. Changes within the same use class, and some temporary uses, are not development:
- Within agriculture: Changing from arable farming to grazing, or from one crop to another, is not development — it’s within the agricultural use class
- Temporary uses: Using land for events or other temporary uses for up to 28 days per year is permitted development (Class B of Part 4)
- Agricultural buildings: Erecting farm buildings is development, but may be permitted under Part 6 (see agricultural buildings guide)
The following do require planning permission:
- Converting agricultural land to residential (gardens, curtilage extension)
- Commercial development on agricultural land
- Extractive uses (quarrying, mineral extraction)
- Solar farms or wind turbines on agricultural land
Permitted Development Rights for Agricultural Land
Several permitted development rights allow limited changes of use involving agricultural land:
| PD Class |
What It Permits |
Key Conditions |
| Part 6 Class A/B |
Agricultural buildings, structures, and operations on agricultural units |
5ha+ (Class A) or 0.4–5ha (Class B); Prior Approval may be needed |
| Part 3 Class Q |
Agricultural building to dwellinghouse |
Building (not land) in agricultural use; Prior Approval required; max 5 dwellings per unit |
| Part 3 Class R |
Agricultural building to flexible commercial use |
Building in agricultural use; Prior Approval required; max 500m² |
| Part 4 Class B |
Temporary use of land for up to 28 days per year |
Not more than 14 days for motor sports/clay pigeon shooting; no markets |
⚠️ Class Q and Class R apply to buildings, not open land The Class Q and Class R permitted development rights only apply to agricultural buildings — they do not permit the conversion of open agricultural land to residential or commercial use. Open land (fields, paddocks) cannot be developed under these PD rights without a full planning application.
Agricultural to Non-Agricultural Uses
Converting agricultural land to non-agricultural use (other than through the specific PD routes above) requires a full planning application. Planning policy for non-agricultural uses on agricultural land varies by Local Plan but generally:
- Proposals involving loss of best and most versatile agricultural land (Grade 1, 2, or 3a under the Agricultural Land Classification) face particular scrutiny
- Development in the open countryside is controlled by policies that resist new non-agricultural development that would harm rural character
- The NPPF requires planning policies to recognise the importance of securing economic growth and supports farm diversification
Agricultural Land to Residential
Converting agricultural land to residential use (to extend a garden, create a new housing plot, or as curtilage for a new dwelling) requires planning permission. There is no permitted development right for residential development on open agricultural land.
However, there are two routes worth noting:
- Class Q: Class Q permits conversion of agricultural buildings (not land) to dwellinghouses, with associated land within the curtilage of the building. It doesn’t permit new-build on agricultural land
- Extending garden: Incorporating agricultural land into the curtilage of a house (enlarging the garden) is a material change of use from agricultural to residential. This requires planning permission even if the land is small. Once agricultural land is incorporated into a residential curtilage, it becomes subject to residential PD rights
Frequently Asked Questions
Can I use agricultural land as a garden without planning permission?
No — incorporating agricultural land into the curtilage of a dwelling (making it part of the garden) is a material change of use from agricultural to residential, which requires planning permission. This applies even to small areas of land. However, once the council has granted permission and the land is part of the residential curtilage, standard Part 1 permitted development rights for houses apply to it. Be cautious: if you simply start using agricultural land as a garden without permission, the council could take enforcement action.
Can I build houses on agricultural land?
Not without planning permission — there is no permitted development right to build new dwellings on agricultural land. Even Class Q (the agricultural building to residential PD right) converts existing agricultural buildings, not open land. Building houses on agricultural land requires a planning application, assessed against the development plan. Sites inside the settlement boundary of a village or town may be more likely to be granted permission than greenfield agricultural land in open countryside.
What is ‘best and most versatile’ agricultural land?
Best and most versatile (BMV) agricultural land is land in grades 1, 2, and 3a of the Agricultural Land Classification (ALC). The NPPF requires planning authorities to protect BMV land from unnecessary development. Proposals involving significant areas of BMV land face greater scrutiny. Grade 3 land is split into 3a (BMV) and 3b (not BMV) — if the ALC grade for a site is uncertain, a detailed ALC survey may be needed to determine which sub-grade applies.
Does planning permission expire on agricultural land?
Yes — planning permissions on agricultural land (as elsewhere) are subject to expiry. Most planning permissions must be implemented within 3 years of being granted (though the permission itself may include a different time limit). If a permission expires before implementation begins, a new application is needed. For agricultural buildings built under Part 6 PD rights, there is no expiry — the building can be erected at any time after the PD conditions are met (or after Prior Approval is granted).
More on Permitted Development Rights
Extensions, loft conversions, outbuildings, solar panels — our complete guide covers everything you can build without planning permission.
Read the Complete PD Guide →
