When your neighbor decides to build an extension, it is essential to know your rights. Here are some of the rights you need to consider:
- Party Wall Agreement: If the extension involves work on a shared wall, then you need a party wall agreement to ensure that the work does not cause any damage or affect the stability of the wall or the neighbor’s property. 
- Planning Permission: If the extension exceeds certain dimensions or height, then your neighbor needs planning permission. You have the right to view and comment on the planning application. 
- Building Regulations Approval: Your neighbor needs building regulations approval to ensure that the work meets the necessary safety and structural requirements. 
- Right to Light: If the extension affects your right to light, then you may have legal rights to prevent the extension or seek compensation.