Apply for planning permissionSearch planning applicationsReport a planning enforcement issue Scroll Single-storey rear extensions A change in the law will allow some house owners to build larger single-storey rear extensions Residential extension guidelines Clear advice to our customers on what the council considers to be acceptable forms of extension to residential properties Hounslow planning guide The Hounslow Planning Guide is an independently produced guide covering all aspects of the planning process Self-build register The Local Self Build Register will gather detailed information from people who want to build their own homes in Hounslow Find an architect Find an architect who can plan, design, and review the construction of your building