Often you don't. Many garden rooms count as permitted development, which means no planning application is needed. The rules are specific, so check them before you settle on a design. Our planning permission guide explains them in more detail.
The main permitted development rules
- Single storey only, with no balcony, veranda or raised platform over 0.3 m high.
- Not in front of the principal elevation, which is usually the front of the house.
- No more than 2.5 m high if it is within 2 m of a boundary. Further away, it can be up to 4 m with a dual-pitched roof or 3 m with any other roof, with eaves no higher than 2.5 m.
- Outbuildings and extensions together must cover no more than half the land around the original house.
- It must be used as an office, gym, studio or similar, not as a bedroom or separate home.
When you will need to apply
In a conservation area such as Low Fell or Whickham, you cannot place an outbuilding between the side of the house and the boundary without permission. Listed buildings, flats and maisonettes have no permitted development rights for outbuildings at all. Some newer estates also have planning conditions that remove these rights, so it is worth checking the original approval for your house.
If your design is close to a limit, a Lawful Development Certificate from Gateshead Council gives you formal certainty. If you do need to apply, the householder planning application fee in England was set at £528 from April 2025 and is now index-linked, so check the Planning Portal fee calculator for the current figure.
Building Regulations
Rooms under 15 m² with no sleeping accommodation are generally exempt. From 15 to 30 m², they are generally exempt if they sit at least 1 m from every boundary or are built mainly from non-combustible materials. Any new electrical circuit must meet Part P and be installed and certified by a registered competent person. We explain where your design sits at the start, along with the likely costs, and we always suggest confirming your own case with the council. The same rules apply to all our garden rooms in Newcastle and across the North East.