House Extension Planner

Plan your house extension with the same tool we use with our own clients.
Whether you're planning a rear extension, a side extension, a loft conversion or a double storey build, we built this planner to give you everything you need to stay in control of your project, your budget and your timeline — drawing on years managing extensions across South London.
It helps you:
Plan and track your entire extension budget
Compare quotes from different builders side by side
Monitor planning permission and building control progress
Track stage payments as they're due, so you avoid overpaying
Record materials, variations and snagging items as they come up
Get an at-a-glance project summary any time you need it
 
Whether you're project managing yourself or working closely with a builder, this is the same structure we bring to every extension job.