Garden office or recreation space, built in your garden. They don't require planning permission, if the building:

• Has a maximum overall height of no more than 2.5m if placed less than 2m from the boundary of your property

• Has a maximum eave height of 2.5m (resulting in an overall height of 4m for a dual-pitched roof or 3m for a pent-roofed building) if placed more than 2m from the property’s boundary.

Designed exactly to your needs, makes the most of natural light and maximises your space. Building a garden room won't cause any disruption to your normal day to day life.

Or you can convert your loft or garage into working space. Read about conversions here Loft & Garage Conversions