Garden rooms, home offices and outbuildings: what you can build.

Demand for garden rooms, home offices and workshops has never been higher. Many can be built under permitted development, without a planning application, but the limits are specific, and a building that strays over them, or sits in a sensitive location, needs permission. Knowing which applies avoids an expensive mistake.

When an outbuilding is permitted development

If Permitted Development rights are intact, Permitted development allows outbuildings for purposes incidental to the enjoyment of the house, within limits on use, height, position, and how much of the garden is covered. A single-storey studio or office within those limits, and used ancillary to the home, can often be built without permission. The detail matters: use, eaves and ridge heights, proximity to boundaries, and position relative to the house all count.

When you need planning permission

You will need permission where the building exceeds the permitted development limits, where it would be used as a separate dwelling or for a business beyond incidental use, or where those rights have been removed. A Lawful Development Certificate is always worth having to confirm in writing that a permitted development building is lawful.

Tighter rules in sensitive areas

In National Parks, National Landscapes and Conservation Areas, and within the grounds of a listed building, the rules are more restrictive and more work needs permission. In these settings the design and siting of an outbuilding have to be handled with care, which is often where a considered, purpose-designed building pays off over an off-the-shelf pod.

Designing an outbuilding that lasts

The best garden buildings are properly designed for their use and their setting, not just dropped on the lawn. Good proportions, quality materials and a sensible relationship to the house and garden make a building that adds value and genuinely works, as with our home office and workshop in Wivelrod.

Common questions

Do I need planning permission for a garden room?

Often not, if it stays within permitted development limits and is used incidentally to the house. But the limits are precise, and are tighter in designated areas, so it is worth checking before you build.

Can I run a business from a garden office?

Limited home working is usually fine, but if the use goes beyond incidental, for example with staff or visitors, it may need permission. The line depends on the scale and nature of the use.

How big can an outbuilding be under permitted development?

There is no single figure. It depends on height, position, and the proportion of the garden covered, among other limits. An appraisal can guide you on what your specific plot is likely to secure.