Advice centre
What things cost, what needs permission, and why.
Four guides written from the work itself: real range figures for London, the planning position for lofts, and what an RSJ actually involves. No filler, no invented statistics.
Updated November 2026 · London & Hertfordshire
Advice / Cost guide
House extension costs in London
What a rear, side return or double storey extension is likely to cost, what moves the figure up or down, and how to budget before you instruct anyone.
Updated November 2026 · 9 minute read
Advice / Planning
Loft conversion planning permission in London
When a loft conversion can be built under permitted development, when it needs a planning application, and why Building Regulations apply either way.
Updated November 2026 · 8 minute read
Advice / Cost guide
Bathroom renovation costs in London
What a new bathroom, en-suite or wet room is likely to cost in London, where the money actually goes, and what to decide before work starts.
Updated November 2026 · 7 minute read
Advice / Structural
RSJ installation in London
What an RSJ actually is, what has to happen before one goes in, and why the steel is the smallest part of the job.
Updated November 2026 · 8 minute read
Beyond these guides
If your question is about a specific property, a guide cannot answer it. Describe the house and what you are considering, and we will tell you what the work involves, what approvals are likely to apply and how the project would run.
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