GuidesEngland and Wales
The answers, before anyone asks you for an email address.
One question per guide, answered in full at the top. Every figure says what it is based on and when it was last checked. We use the industry’s real words and define them in the same breath.
- 01Cost9 minute read
What does a side return extension cost in 2026?
A worked example for a 24 square metre side return, with every line the quote usually leaves out.
- 02Cost8 minute read
How much does a loft conversion cost in 2026?
Cost by type of conversion, a worked example with every line, and the two checks to do before you budget anything.
- 03Regulations7 minute read
Do I need building regulations approval for an extension?
Almost always yes, and it is a separate approval from planning permission. Here is which route to take, and the certificate that matters in eight years' time.
Fifteen more
The full library covers budgets, appointing professionals, comparing quotes, living through the work and signing it off.
These three are the newest. The rest sit alongside the workspace, on the product domain, and they are open to read without an account.