Loft Conversion Specialists in Marylebone
Loft conversion in Marylebone W1U, where Buildaway checks structure, headroom and the freeholder position before feasibility hardens into a fixed design.
Your Local Loft Conversion
Specialists in Marylebone
Looking for loft conversion specialists in Marylebone (W1U)? Buildaway works
throughout Marylebone - the townhouses and flats off Marylebone High Street,
Chiltern Street and Manchester Square, and the buildings near Baker Street, Wigmore
Hall, Harley Street and Regent's Park.
Loft conversion in Marylebone means Buildaway checks structure, headroom and the
freeholder position before feasibility hardens into a fixed design. W1U roofs sit on
listed and conservation-area stock where the elevation matters and the lease usually
governs the roof, so guessing is expensive. Buildaway's Marylebone loft team
establishes the position, then takes the job from survey through structure, stairs
and insulation to building control sign-off.
Our Loft Conversion Packages in Marylebone
Velux Conversion
Ideal for cost-effective space addition. Includes structural survey, Velux roof windows, staircase installation, insulation to building regs, plastering, electrics and lighting, flooring, building regulation approval.
Dormer Conversion (Most Popular)
Complete loft transformation. Includes structural assessment, dormer construction, steelwork, staircase fitting, full insulation, plastering, electrics upgrade, flooring, heating, building regulation approval, waste removal.
Hip-to-Gable or Mansard Conversion
For those seeking maximum space. Includes architectural design, full structural alterations, steelwork, bespoke staircase, en-suite bathroom option, planning and building regulation handling, full project management.
Why Marylebone Homeowners Choose Buildaway
Local teams with expertise across Marylebone Village, W1, Baker Street, and West End neighbourhoods
Based in your area with local expertise and reputation.
Bespoke loft designs for Georgian homes, luxury apartments, and prime London residences
We handle everything so you don't have to worry.
Transparent and honest pricing with no hidden fees or unexpected charges.
Clear upfront pricing with no surprises along the way.
Hassle-free project management ensuring seamless, high-quality results
Meticulous craftsmanship in every aspect of your loft.
Completed projects near Marylebone High Street, Regent's Park, and Chiltern Street
Professional consultation and detailed quotes at no cost.
What's Included in Your Loft Conversion
Every Buildaway loft conversion includes all the essentials - from structure to finish.
Dormer, L-shaped, hip-to-gable and Velux conversions
Expertly built to match your property type, maximise head height, and flood your new space with natural light.
Structural works and steel installation
All reinforcements and load-bearing elements installed to regulation, ensuring long-term strength and compliance.
New staircase installation and floor construction
Safe, stylish staircases built to code - with solid floors that integrate seamlessly with the rest of your home.
Insulation, ventilation and roofing upgrades
Energy efficiency and climate control built in - for comfort all year round.
Electrical work, plumbing and heating
All new electrics, radiators, lighting and en-suite plumbing fully managed and installed.
Rooflights, skylights and windows
Brighten the space with high-quality glazing and natural light solutions.
Latest Loft Conversion Insights
We publish detailed loft conversion guides and cost insights for homeowners across Marylebone and surrounding areas, helping customers plan projects with clarity before starting work.
Loft Conversion Costs in London 2026
What a dormer, hip-to-gable or mansard conversion really costs in London, and what drives the number.
Extension vs Loft Conversion: Which Adds More Value?
Comparing the cost, disruption and resale return of going up versus going out.
What Adds the Most Value to a London Home
Which renovations genuinely return their cost when you sell, and which ones quietly do not.
What Our Clients Say
Real reviews from our satisfied customers.
“We had an excellent experience working with Buildaway. Cormac was incredibly easy to work with, and gave helpful advice. The finished job was neat, professional and completed efficiently. We'd definitely recommend and would use them again!”
Roisin Lawrence
“It was an absolute pleasure working with Cormac and the Buildaway team. Greg is an absolute star. Cormac’s communication and advice was excellent, and the organisation and sourcing of additional materials was brilliant. A truly great team, I would thoroughly recommend Buildaway if you are after a stress free and top quality renovation.”
Sim Lewis
“Greg's attention to detail and dedication elevated both the experience and the result - he certainly knows his way around a tile. In addition to the bathroom refit, Cormac replaced all the plastic switches, sockets and pull-cords in the house with brushed brass. Highly recommended and will certainly work with the Buildaway team again…”
Kane Dempsey
“I am extremely impressed, happy and proud of what he and his team of Archie, Ben and Danny delivered. They all went beyond and far, I am very grateful for what they have done for me. I would 100% recommend Buildaway for any building, renovation etc - an excellent team with a good rapport, team spirit and working harmoniously together. Thank you Team Buildaway…”
Betty Lwanga
“From my first contact with Cormac, I was in good hands. His team turned my vision into reality, communicating with me every step of the way and offered helpful suggestions which turned my bathroom into an oasis. I could not be happier and would highly recommend their services. Thank you to the team of Buildaway Construction Ltd…”
Jackie Brown
“The quality of the work, their high standards, and their professionalism, along with effective and proactive communication made a refreshing change from the builders I have used in the past. Even when we changed our minds and ideas during the job Cormac’s patience and support emphasised that he wanted to make sure that the finished product was exactly what we wanted…”
Michael Marks
Frequently Asked Questions
Your questions about loft conversions in Marylebone, answered.
How much does a loft conversion cost in Marylebone?
As a guide, loft conversion in Marylebone (W1U) runs about £35,000–£45,000 for a Velux or roof-light scheme, £45,000–£55,000 for a dormer, and £65,000++ for a hip-to-gable or mansard. UK guides put dormers around £40,000–£60,000 and mansards £50,000–£80,000, with London consistently at the top of those ranges. Buildaway fixes your figure in writing after survey.
How long does a loft conversion take in Marylebone?
A Marylebone loft conversion typically takes 6 to 10 weeks on site. A dormer runs nearer 6–7, a mansard or hip-to-gable 8–10 or more. That excludes the paperwork ahead of it: party-wall awards alone can take 4–8 weeks in W1U terraces and cannot be rushed. Buildaway starts that clock early.
Do I need planning permission for a loft conversion in Marylebone?
Many Marylebone loft conversions fall under permitted development, but not all. Around W1U a rear dormer is often acceptable while anything altering the front roof slope usually is not. Conservation-area designation and listed status remove permitted development rights entirely, so Westminster City Council approval becomes essential. Buildaway establishes your position before drawing anything.
What types of loft conversion do you offer in Marylebone?
Rooflight, dormer, hip-to-gable and mansard - Buildaway builds all four in Marylebone. The right answer for your W1U roof depends on ridge height, the stair, and what Westminster City Council will consent. We establish that before proposing a design.
Do Buildaway handle both design and construction for Marylebone lofts?
Yes. Buildaway takes Marylebone lofts from feasibility survey and structural design through party-wall notices, Building Control, steels, stairs, insulation, glazing and finish. One contract across every W1U project, so nobody can blame the engineer for the builder's work or vice versa.
Are your loft specialists local to Marylebone?
Buildaway covers Marylebone and the wider W1U area year-round. Having converted lofts on this housing stock repeatedly, we know its constraints before the survey starts - and we are nearby long after handover.
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We Serve Marylebone and Surrounding Areas
Find us in the heart of Marylebone. We are proud to serve our local community.
Nearby Areas We Serve
Below are some of the local areas where you can find Buildaway transforming homes.
Ready to Transform Your Loft in Marylebone?
Buildaway combines timeless design with expert craftsmanship - enhancing property value across Marylebone's exclusive market.