Can I Build a Garden Office Without Planning Permission?
Usually, yes — garden offices, studios, gyms, and other outbuildings are permitted development under Class E of the GPDO 2015, as long as they are “incidental to the enjoyment of the dwellinghouse” and meet the size and height limits.
The key limits:
- Max height (dual pitch): 4 metres
- Max height (any other roof): 3 metres
- Max eaves height: 2.5 metres
- If within 2m of a boundary: max overall height 2.5 metres
- Total coverage: outbuildings (plus all other extensions and buildings) must not cover more than 50% of the curtilage
- Position: cannot be forward of the principal elevation
Last updated: April 2026
The “incidental use” rule
A garden office used for working from home is generally considered “incidental” to the dwelling and does not need planning permission. However, if the outbuilding becomes the primary location of a business — for example, you employ staff who work from it, clients regularly visit, or it operates as a commercial premises — it may constitute a change of use and require planning permission.
The line can be blurry. A good rule of thumb: if you are using it for your own remote work and it supports your home life, it is incidental. If it operates more like a standalone commercial premises, it probably is not.
Conservation area restrictions
On designated land (conservation areas, AONBs, National Parks), outbuildings:
- Cannot be placed to the side of the house
- Cannot be placed between the house and the highway
- Are subject to the same height limits but face stricter scrutiny
When you will need planning permission
- The outbuilding exceeds the height limits
- Total coverage exceeds 50% of the curtilage
- The outbuilding is forward of the principal elevation
- Your property is a listed building
- It includes sleeping accommodation (this removes PD rights entirely)
- It is not “incidental” to the dwelling (business use, separate dwelling)
Building regulations
Outbuildings are exempt from building regulations if:
- Under 15m² — exempt with no conditions
- 15–30m² — exempt if single storey, contains no sleeping accommodation, and is either at least 1m from any boundary or built of non-combustible materials
- Over 30m² — building regulations required
If your garden office is over 30m² or includes sleeping accommodation, you will need building regulations approval.
Do not forget
- A Lawful Development Certificate — costs £274 and proves your outbuilding is lawful. Read why you need one.
- Party wall notices may apply if you are excavating foundations near a neighbouring structure.
Full details: Outbuilding PD Guide
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