Loft conversion cost
in Marylebone.
Marylebone — W1 — north of Oxford Street. Georgian and early Victorian terraces, the Portman and Howard de Walden estates, and a strong concentration of mansion blocks.
What makes loft work in Marylebone distinct.
Housing: Georgian and Victorian terraces (estate-owned in many cases), plus large mansion blocks along Marylebone Road and Baker Street.
Planning: Marylebone Conservation Area covers the bulk of W1 north of Oxford Street. Many properties are listed or estate-managed with their own design covenants.
Applications go to City of Westminster. We submit on your behalf and handle conservation officer correspondence end-to-end.
The five loft types — W1 numbers.
All figures inclusive of design, planning, build, contingency and VAT. The Marylebone multiplier (1.20×) reflects local labour, scaffolding logistics, conservation requirements and finish expectations.
The 2026 London Loft Cost Guide.
Borough-by-borough pricing, a full cost breakdown, PD vs full planning explained, and the seven hidden costs to watch for in Marylebone and beyond.
Send me the guide.
What Marylebone homeowners ask us.
Do I need planning permission for a loft in Marylebone?
Marylebone Conservation Area covers the bulk of W1 north of Oxford Street. Many properties are listed or estate-managed with their own design covenants. Outside conservation areas, most rear-dormer conversions in Marylebone qualify for permitted development (PD) within the 40m³ (terrace) or 50m³ (semi/detached) volume limits. Mansards always need full planning. We check your specific address before quoting and submit the application on your behalf.
How do estate-owned properties affect loft conversions in Marylebone?
Significantly — the Howard de Walden and Portman estates have their own design covenants in addition to Westminster planning. Estate approval is required before planning is submitted, and the estate's design preferences often go beyond what planning policy strictly requires. We work to estate-approval standards from the design phase onwards.
How long does a Marylebone loft conversion take?
Typical timeline: 6–10 weeks for design and planning (longer in conservation areas like much of Marylebone), then 8–14 weeks on site for a standard dormer, 12–18 weeks for an L-shape or hip-to-gable, and 14–20 weeks for a mansard. City of Westminster processes PD-route Lawful Development Certificates in approximately 8 weeks.
What does a loft conversion add to Marylebone property values?
In W1, a well-executed loft conversion typically adds 15–25% to property value — often more in prime postcodes. The ROI is strongest when you add a double bedroom plus en-suite, which is the standard L-shape dormer configuration. Property uplift on a £54k–£264k build commonly exceeds the build cost by 30–60%.
Does 2VP work on Marylebone loft conversions?
Yes — Marylebone is within our core London catchment. Our studio is at 20 Dawes Road in Fulham, 6.0km from Marylebone. We've delivered loft conversions across the W1 postcode and our subcontractor network covers Westminster. Free site visit, itemised quotation, 12-month workmanship warranty on second-fix fittings on the finished work — with an optional 10-year HomePro guarantee on request, arranged with HomePro and paid directly to them at 2.5% of the contract value.
Pricing for Marylebone’s neighbours.
Twenty minutes on site in Marylebone.
On us.
Nick Elias RIBA and Vladimir will visit your Marylebone home, walk the loft, check head height, advise on PD vs planning, and give you a realistic budget and programme — even if a loft isn’t right for your house.
One number. Sixty seconds. No callback.
Price your Marylebone loft conversion using the same 2026 rate card we quote real clients with.
Price my Marylebone loft →The home you actually want, finished on the date in the contract — and you watch every day of it happen from your phone.
- Your number in 60 seconds
- Itemised stage breakdown in 2 minutes
- Survey within 7 days
You answer 3 questions. We do the drawings, planning, party wall, trades and snagging.
- 10% to mobilise, then weekly against work already done — with 5% held past handover: 2.5% released at practical completion and 2.5% at the end of the 12-month defects period
- £550 survey fee credited in full against your contract
- Every variation priced and signed before a penny is spent
The date is a term of the contract. We finish on the agreed date, or we pay you £500 for every week we are late.
4.8 from 16 Google reviews
Every review is published in full on our reviews page, including the one-star. Google is the only platform we quote a rating for, because it is the only one we can evidence.
As a structural engineer, I've collaborated with 2VP Projects Ltd on several residential projects in London. Their attention to detail, proactive site management, and clear communication make every stage—from design to execution—smooth and efficient. It's rare to find a contractor who values both precision and professionalism at this level. A truly reliable partner.
Great company to work with. Professional, reliable and easy to deal with. Vladimir and the team are always responsive, straightforward and genuinely care about doing things properly. I've had a very positive experience working with 2VP and would happily recommend them.
Extension went smoothly from start to finish. Communication was great throughout, and the team delivered exactly what we asked for. Thank you, 2VP!
What is covered, and by whom
A builder’s own guarantee is worth exactly as much as the company standing behind it. Here is what comes as standard, what you can add, and what has to come from somebody other than us — set out in full on our insurance and guarantee page.
- 12-month workmanship warranty on second-fix fittings
- £5M public liability
- £10M employer's liability
- £2M professional indemnity
- HomePro insurance-backed guarantee, 10 years
- Priced at 2.5% of the contract sum
- Underwritten by an insurer, so it survives us
- 10-year structural warranty on a new dwelling (NHBC / LABC / Premier)
- Professional fees — architect, engineer, building control
- We will tell you when you need one rather than let you find out