Loft Conversions in Marylebone, W1
Dormer, hip-to-gable and mansard loft conversions for houses in Marylebone: a bedroom and bathroom under the roof, designed and built by one team.
Covered under one contract
- Structural design and calculations
- Planning or lawful development certificate
- New staircase, dormer and roof windows
- Insulation, fire safety and building control
- En-suite designed and fitted
- Waterproofing with guarantee for basements
Loft Conversions in Marylebone.
A loft conversion adds a bedroom and bathroom without touching the garden, and in most of Marylebone it is the most cost-effective way to gain a floor. Which type suits your house depends on the roof: Victorian and Edwardian terraces usually take a rear dormer, 1930s semis with hipped roofs need a hip-to-gable conversion to make the space usable, and in conservation areas a mansard or rooflight scheme may be the only option.
We start by measuring the roof. About 2.2 metres from the top of the joists to the ridge is needed for a comfortable room; we check this at the first visit before anything is drawn. From there our architects design the layout and the stair, our engineers design the new floor and any steelwork, and our team builds it with the house occupied throughout.
Most lofts are permitted development within the 40 or 50 cubic metre allowance, with the dormer at the rear. Flats, listed buildings and streets with Article 4 directions need a planning application, and every loft needs building regulations approval for the structure, fire escape and insulation. We manage all of it.
- Area
- Marylebone, W1 · NW1
- Council
- City of Westminster
- Housing
- Georgian and early Victorian terraces, mews houses, mansion blocks and converted flats
- Transport
- Baker Street, Marylebone, Bond Street
- Loft, on site
- 8 to 12 weeks
- Headroom needed
- About 2.2 m at the ridge
- Consent
- Often permitted development for lofts
Marylebone: the houses and the planning rules.
Marylebone is where Space Cucina started, as a kitchen company on Seymour Place. The district is a grid of Georgian and early Victorian streets laid out by the Portman and Howard de Walden estates: flat-fronted brick terraces, stucco around the squares, mews houses behind, and the great mansion blocks of Marylebone Road and Baker Street.
Most of the housing is now flats, from mansion-block apartments to lateral conversions across two houses, which makes refurbishment here as much about approvals and logistics as about design: licences to alter, estate consent, parking suspensions and lift access all shape the programme. We have refurbished bathrooms on Marylebone Road and fitted kitchens for clients across the district.
The Portman Estate, Harley Street and Dorset Square conservation areas cover almost all of it.
Westminster City Council
Applications go to Westminster. Almost the whole district is within conservation areas, and many terraces are Grade II listed, so internal changes to listed houses need listed building consent.
Estate consent
On the Portman and Howard de Walden estates, the freeholder's own approval is needed in addition to planning, with their own design guidance for windows, roofs and rear elevations.
Mansion flats
Block rules govern working hours, deliveries and noise. We plan the programme around them and coordinate with the managing agent.
Approvals for loft conversions in Marylebone.
Most loft conversions are permitted development within the 40 cubic metre allowance for a terrace or 50 for other houses, with the dormer at the rear. Conservation areas, flats and front dormers need a planning application, and every loft needs building regulations approval.
Applications go to Westminster. Almost the whole district is within conservation areas, and many terraces are Grade II listed, so internal changes to listed houses need listed building consent.
What loft conversions in Marylebone includes.
- Structural design and calculations
- Planning or lawful development certificate
- New staircase, dormer and roof windows
- Insulation, fire safety and building control
- En-suite designed and fitted
- Waterproofing with guarantee for basements
From site visit to handover.
- 01
Site visit & consultation
We visit, listen and measure. Brief, budget and constraints understood before any advice is given.
- 02
Design & itemised quote
Our architects and engineers draw the scheme, and from that we provide a transparent, itemised quotation for your approval.
- 03
Planning & approvals
Planning applications, building control and party wall matters handled for you.
- 04
Build, managed weekly
Our own trades, sequenced by a site manager. Progress reported every week.
- 05
Handover & aftercare
Joint snagging walk-through, documentation, and a guarantee on our workmanship.
Loft Conversions in Marylebone: your questions.
Is a loft conversion in Marylebone permitted development?
Often, provided the added volume is within 40 cubic metres for a terrace or 50 for other houses and the dormer is at the rear. Flats, listed buildings and streets with Article 4 directions need an application to the City of Westminster.
How much headroom do I need for a loft conversion?
About 2.2 metres from the top of the ceiling joists to the ridge. Victorian and Edwardian roofs usually have it; 1930s hipped roofs often need a hip-to-gable conversion to make the space usable. We measure at the first visit.
Which parts of Marylebone do you cover?
All of Marylebone and W1 · NW1, including Seymour Place, Marylebone High Street, Montagu Square, Dorset Square, Harley Street, Baker Street, and the neighbouring districts. We are based in London and our teams work across central, north, north-west, west and south-west London.
Our work near Marylebone.
Other services in Marylebone.
House Refurbishment in Marylebone
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Flat Refurbishment in Marylebone
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House Extensions in Marylebone
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Structural Alterations in Marylebone
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Basement Conversions in Marylebone
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Kitchen Renovation in Marylebone
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Bathroom Renovation in Marylebone
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Bespoke Joinery & Fitted Furniture in Marylebone
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Architectural & Interior Design in Marylebone
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Planning Permission & Building Regulations in Marylebone
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We will visit, listen and explain what is possible for your property and how it would be approved. No pressure, no sales pitch.