Find out whether you need planning permission and what the build is likely to cost, in about three minutes. Then keep the whole job in one place.
A permitted-development read from your house type, the size you want, how close you sit to each boundary and how much garden you would cover, plus conservation area, Article 4 and listed status.
An eight-phase checklist, Planning and Permissions through to Finishing, cut down to what you are actually building. Party wall dates worked out from the statutory windows.
2026 trade prices adjusted for your region and scaled to your floor area and room count, your own contingency, and what you have actually spent, side by side.
About three minutes. No account, and nothing to install.
Both move as you change the numbers, so you can try a smaller build and watch what it saves you.
Make a free account to save the project, and tick the checklist off as the job runs.
Snap a receipt with the camera and let it read the total off the paper. Get a reminder when a party wall date comes due. Lock the app behind Face ID.