Class Q vs full planning: which do you need?

The problem with full planning in the countryside

Normally, building a new home in open countryside is hard. Council planning policies generally steer new houses towards towns and villages, so an application to convert a barn out in the fields can be refused simply because of where it is, however good the design.

How Class Q gets around that

Class Q is a permitted development right, set nationally by the government. It grants permission in principle to convert a qualifying agricultural building into homes. Instead of a full planning application, you apply to the council for prior approval.

The key difference is that the council can't refuse it just because it's in the countryside or doesn't fit local housing policy. It can only consider a fixed list of things:

• Transport and highways
• Noise
• Contamination
• Flood risk
• Whether the location or siting makes the change impractical or undesirable
• Design and external appearance
• Natural light in the habitable rooms

Why it's usually simpler and cheaper

• Lower council fee. From April 2026, a Class Q prior approval with building works costs £536, compared with £610 per home for a full planning application, and the gap grows the more homes you build.
• Fewer reports and drawings. Because the principle is already granted, you're not paying consultants to argue the case for a house in that location.
• A set timescale. The council has 56 days to decide. If it doesn't decide in time, approval is normally treated as granted.
• More certainty. If the building qualifies and the listed matters are acceptable, the council has much less room to say no.

The catches

• It must be a conversion. The existing building has to be structurally capable of conversion, not effectively a rebuild.
• The building must have been part of an agricultural unit on or before 24 July 2023.
• Limits apply: up to 10 homes, 1,000 m² in total and no more than 150 m² per home. A single-storey rear extension of up to 4 m is allowed, on existing hardstanding only.
• It doesn't apply to listed buildings, or in National Landscapes (like the North Devon Coast), National Parks (like Exmoor) or conservation areas.
• The work must be completed within three years of approval.

When you need full planning instead

If the barn is in a protected area, isn't structurally sound enough, or you want a bigger or more altered design than Class Q allows, you'll need a full planning application. It's still possible, it just needs a stronger case.

Not sure which route your barn needs?

We're happy to look at the building and talk through the options. Planning rules change, so always check the current position with the council or a planning consultant before committing. More on our Class Q conversions.