Loft conversions in St John’s Wood.
Marylebone · W1 · Marylebone listed apartmentCompleted work, photograph
Lofts for St John’s Wood villas and terraces, within Westminster’s roof rules. Designed, priced and built by one team.
A St John’s Wood roof, read before it is drawn.
- 1967
- Most of the area became a conservation area
- £215 to £425
- A sq ft, our loft band
- NW8
- Villas, pairs and short terraces
NU Projects is a design and build company in Fulham SW6, founded in 2010. We handle loft conversions, dormers and mansards in St John’s Wood NW8. A loft runs £215 to £425 a sq ft, construction only. Call 020 7731 6841, and a budget estimate typically follows within seven days.
St John’s Wood was laid out as villas in gardens. Many are pairs, with shallow roofs.
A pair reads as one building. Changing one half can unbalance both.
Westminster’s roof guide resists extensions on unspoilt groups and on paired villas with parapets.
So the loft we propose depends on the roof you have. Sometimes it is rooflights only.
Where a roof can take more, we draw a rear dormer or a mansard.
What Westminster allows on a St John’s Wood roof.
- Council
- City of Westminster. Hampstead, to the north, is Camden, with its own rules.
- Unspoilt groups
- Roof extensions are not normally acceptable on a largely unimpaired group.
- Pairs
- Altering only one of a pair with parapets is resisted. It unbalances the roofline.
- Mansards
- Where an extension is allowed, a mansard is often the most discreet form.
- Dormers
- Modest in size and simple in design. The guide applies to the back as well.
- Permitted development
- None for a dormer in a conservation area. Planning permission is needed.
Source: Westminster’s Roofs guide to alterations and extensions on domestic buildings. Read on 6 October 2026. Policies change, so we read them again for your address.
Our work in north and central London.
Marylebone·Apartment
Marylebone listed apartment
A listed Marylebone apartment, consented and built under Westminster’s rules.
See the project
North London·House
North London house, reconfigured and fitted out
A North London house, reworked on every floor by one team.
See the projectCompleted work, photographs
What a loft conversion costs in St John’s Wood.
£215 to £425a sq ft, construction only. Our loft band.
£90k to £140kA dormer loft. A project total, from our 2026 cost guide.
£140k to £220kA mansard loft. A project total, from our 2026 cost guide.
A villa roof is often wider than a terrace’s, so the floor area grows.
The band is per square foot, construction only. The guide figures are project totals.
Fees, party wall costs, contingency and VAT sit outside both.
What St John’s Wood owners ask about lofts.
In St John’s Wood
- Every service in Hampstead and St John’s Wood
- Basement construction in St John’s Wood
- Luxury refurbishment in St John’s Wood
Lofts nearby
- Loft conversion across London
- Loft conversion in Highgate
- Loft conversion in Fulham
- Loft conversion in Marylebone
- Loft conversion in Notting Hill
- Loft conversion in Chelsea
- Marylebone, Bayswater and Maida Vale
- Islington, Highgate and Primrose Hill
- Camden
Further reading, from the journal
Can I add a dormer to my St John’s Wood villa?
Often at the back, rarely at the front.
Westminster wants dormers modest and simple, front or back.
On an unspoilt pair, even a rear dormer may be resisted.
Is a mansard allowed in St John’s Wood?
Sometimes. Westminster calls a mansard often the most discreet roof extension.
It is resisted where the group’s roofline is still intact.
We check the neighbouring roofs before drawing one.
Do St John’s Wood lofts need planning permission?
Almost always. Most of the area is conservation area.
There, a dormer cannot go ahead under permitted development.
Rooflights alone may not need it. We confirm for the address.
Can I add a roof terrace in St John’s Wood?
Only where it does not harm the building or the neighbours.
Westminster’s roof guide weighs overlooking and the look of the roof.
A terrace set behind a parapet stands the better chance.
What does a St John’s Wood loft conversion cost?
Our loft band is £215 to £425 a sq ft, construction only.
Our 2026 cost guide puts a dormer loft at £90k to £140k.
A mansard loft runs £140k to £220k. Both are project totals.
Tell us about your home in St John’s Wood.
Your name and one way to reply are enough. It goes straight to the studio.
- Already have an architect or designer? We build to their design. Working with your designer
- An NDA on request, and your home is never published without your consent. How we work in confidence