There are many changes and extensions that can be made to houses under the rules for permitted developments.
We have provided a link to the latest document describing the rules. They are quite complex and we usually advise completing the design process before determining whether the proposal needs formal planning consent or can be completed within the rules for a permitted development.
Occasionally we advise a combination of PD and Planning Consent. This is an area that can be confusing at first. We will explain how it affects your particular project.