Do I Need Planning Permission?
Find out whether your extension, loft conversion, outbuilding or home improvement needs planning permission. A clear UK guide for homeowners.
Read guideChoose the picture that looks most like your project. Mason will ask a few simple questions, then explain what you may need to do.

Hi, I’m Mason.
I will guide you one question at a time. You can always choose “I’m not sure”.
No technical knowledge needed
Plain English, clear buttons and calm guidance from beginning to end.
Step 1
Select the picture that is closest to your idea. It does not have to be exact.
Add a new room to the side or rear of your home.
This is what I wantCreate extra living space downstairs and bedrooms above.
This is what I wantTurn your roof space into a useful new room.
This is what I wantConvert an existing garage into living space.
This is what I wantPlan a new kitchen or alter your current layout.
This is what I wantReplace or rearrange a bathroom or shower room.
This is what I wantMake an opening, remove a wall or install a beam.
This is what I wantRearrange rooms, doors, storage and services.
This is what I wantUnderstand the first steps for a new house project.
This is what I wantPlan patios, garden rooms, walls and outdoor spaces.
This is what I wantTell Mason what you are considering in your own words.
This is what I wantPick the project that looks most like what you want to do.
Mason asks one clear question at a time, with an ‘I’m not sure’ option.
See likely permissions, rough costs, useful professionals and your next step.
Knowledge hub
Evergreen, plain-English guidance you can trust — from planning permission to working with builders.
Find out whether your extension, loft conversion, outbuilding or home improvement needs planning permission. A clear UK guide for homeowners.
Read guideUnderstand what Permitted Development Rights cover, the limits that apply and how to check whether your extension, loft conversion or outbuilding qualifies.
Read guideA plain-English guide to when you need planning permission in England, how the process works and what to expect from your local council.
Read guideBuildGuide does not expect you to understand planning language or construction terms. Mason explains them as you go and tells you when something still needs checking by your council or a professional.
Start with a picture