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BADGERo.builder  /  Loft conversion cost
Cost guide · South London · 2026

Loft conversion cost in South London.

A straight guide to what a loft conversion really costs in South London — the types, the price ranges, and what actually drives the number. Written by a builder with 20+ years on the tools, not a lead-generation site.

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The numbers

Typical loft conversion costs.

TypeTypical all-in cost
Rooflight / Velux loft (no dormer)£30k – £45k
Dormer loft (extra headroom & floor space)£45k – £70k
Hip-to-gable + rear dormer£60k – £85k
Mansard (biggest, most involved)£70k – £110k
Add an en-suite+ £6k – £10k

Indicative all-in figures (labour + materials) for South London in 2026. Every house is different — the only accurate price is one from a site visit.

What drives the cost

Why two lofts quote differently.

Head height & roof structureStair positionDormer vs rooflightEn-suite / plumbingPlanning vs permitted developmentLevel of finishAccess to the property
The figures above are typical all-in costs. I also work labour-only if you’re supplying the materials — often the best-value route if you can manage the supply yourself. Either way, I read the structural and architectural drawings together first, so the steel, the stairs and the services don’t fight each other on site.
Recent lofts

A few we’ve finished.

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Loft en-suite - BADGERo.builder South London
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FAQ

Common questions.

How much does a loft conversion cost in South London?
As a rough guide, a rooflight loft starts around £30,000, a dormer £45,000–£70,000, and a mansard £70,000 and up. The real figure depends on head height, the stairs, whether you add an en-suite, and the finish. Get a site visit for an accurate number.
Do I need planning permission?
Many loft conversions fall under permitted development, but dormers at the front, mansards and conservation areas often need permission. I’ll tell you which applies on the first visit.
How long does it take?
Most loft conversions run 6–10 weeks on site, depending on the type and whether there’s an en-suite.
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