Loft conversions in Chelsea.
Chelsea · SW3 · Chelsea terraced houseCompleted work, photograph
Roof rooms and mansards for Chelsea terraces and townhouses. Tested against the borough’s roof policy first.
A Chelsea roof, judged with its neighbours.
- CD12, 2024
- The borough’s roof policy
- Long views
- Rooflines seen from public spaces count
- £140k to £220k
- A mansard loft, cost guide total
NU Projects is a design and build company in Fulham SW6, founded in 2010. We handle loft conversions, dormers and mansards in Chelsea SW3, under one contract. A loft runs £215 to £425 a sq ft, construction only. Call 020 7731 6841, and a budget estimate typically follows within seven days.
Chelsea terraces were often built as matching groups. The roofline belongs to the group.
Policy CD12 resists an extra storey where that line is still complete.
It also resists one where a mansard exists, or the roof has historic interest.
Pitched roofs with eaves are named as unsuitable for extra storeys.
So many Chelsea lofts work within the existing roof volume.
We read the whole terrace before drawing a single room.
What the borough allows on a Chelsea roof.
- Council
- Royal Borough of Kensington and Chelsea, under its Local Plan adopted in 2024.
- Policy CD12
- Roof changes must suit the character of the building and its group.
- Existing mansards
- A building or terrace that already has an extra storey is resisted.
- Pitched roofs
- Roofs with eaves are named as unsuitable for an added storey.
- Long views
- Rooflines in long public views are protected from intrusive additions.
- Dormers
- Original dormers of interest are kept, even where neighbours altered theirs.
Source: Kensington and Chelsea’s Local Plan 2024, Policies CD12 and CD13. Read on 6 October 2026. Policies change, so we read them again for your address.
Built up to the roof.
Chelsea·Terraced house
Chelsea terraced house
A Chelsea terrace renovated over four floors, up to its roof terrace.
See the project
Chelsea·Townhouse
Chelsea townhouse, full refurbishment
A Chelsea family home, every principal room refurbished.
See the projectCompleted work, photographs
What loft conversion costs in Chelsea.
£215 to £425a sq ft, construction only. Our loft band.
£140k to £220kA mansard loft. A project total, from our 2026 cost guide.
£90k to £140kA dormer loft. A project total, from our 2026 cost guide.
A Chelsea roof is priced once the terrace has been read.
The band is per square foot, construction only. Guide figures are project totals.
Fees, party wall costs, contingency and VAT are added to both.
What Chelsea owners ask about lofts.
In Chelsea
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Lofts nearby
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- Fulham
- South Kensington
- Kensington
Further reading, from the journal
Can I build a mansard on a Chelsea terrace?
Only where the terrace allows it. Policy CD12 looks at the whole group.
An unbroken roofline usually rules it out.
A group already broken by many roof additions may allow infill.
Why is my Chelsea pitched roof unsuitable for an extra storey?
Policy CD12 names pitched roofs with eaves as unsuitable.
The space inside the existing roof may still be usable.
Does a riverside Chelsea house face extra roof rules?
It can. Rooflines seen in long views from public spaces are protected.
The borough resists additions that intrude on those views.
Can I change the dormers on my Chelsea roof?
Original dormers of interest are protected under Policy CD12.
That holds even where others in the terrace were altered.
What does a loft conversion cost in Chelsea?
Our 2026 cost guide puts a mansard at £140k to £220k.
A dormer loft totals £90k to £140k.
The loft band runs £215 to £425 a sq ft, construction only.
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