About
About Room to Extend
Honest costs for extensions, lofts and garden rooms, worked out by a quantity surveyor.
Who works out the figures
The guides are written by a quantity surveyor who prices building work for a living. They break costs down the way a QS does, so you can see what drives the price before you speak to a builder.
How the estimates are built
Each estimate starts from a current rate per square metre, or a typical price for each type of loft conversion. It is then adjusted for region and finish, and adds the costs people often forget: design fees, a structural engineer, building control, planning, and a 10% contingency.
Every guide shows the date its figures were last checked. Building prices move, so treat any figure older than a year with care.
Featured firms
Any firm featured on this site pays to be listed, and must pass our checks first. How featured firms are chosen.
What this site is not
It is not a builder and does not quote for work. An estimate here is a planning figure to take into conversations with builders, not a price you can hold anyone to.