Loft Conversion Specialists in Westminster
Loft and roof works in Westminster SW1A and SW1P face tight planning control, so Buildaway establishes the consent position before proposing a scheme.
Your Local Loft Conversion
Specialists in Westminster
Looking for loft conversion specialists in Westminster (SW1A, SW1P)? Buildaway works
throughout SW1 - the mansion blocks around Marsham Street and Great Smith Street,
the flats off Petty France, Broadway and Queen Anne's Gate, and the period buildings
toward Tothill Street and Old Queen Street.
Roof-level work in Westminster faces some of the tightest planning control in the
country, and Buildaway establishes the consent position before a scheme is drawn. In
SW1A and SW1P the roofscape sits within protected views, much of the fabric is
listed, and the freeholder usually owns the roof outright - so feasibility decides
the project long before design does. Buildaway's Westminster team confirms all
three, then delivers structure, stairs, insulation and finish on one contract.
Our Loft Conversion Packages in Westminster
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 Westminster Homeowners Choose Buildaway
Local teams trusted across Westminster, St James's, Belgravia, and Central London
Based in your area with local expertise and reputation.
Bespoke loft designs for heritage buildings, luxury developments, and investment properties
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.
Full project management for a seamless, stress-free experience
Meticulous craftsmanship in every aspect of your loft.
Completed projects near Westminster Abbey, Victoria Street, Horseferry Road, and SW1 postcodes
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 Westminster 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.
“The team turned up when they said they would and kept the house tidy each day, which made a big difference while we were living in the property during the works. The quality of the finish is excellent. The bathroom looks fantastic and the bedrooms feel completely refreshed. We wouldn’t hesitate to recommend Cormac and the Buildaway team…”
Helen Sivyer
“I received an excellent service from the outset with a very high standard of the completed work. Cormac was very responsive to my wish for a traditional period bathroom and helped me to source the suite, the tiles, the paneling and flooring. The team are respectful to the home generally. I am very pleased with the finished bathroom…”
Philomena Mulcahy
“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
“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
“They were also very professional day to day - always tidy, and cleaned up really thoroughly when taking away all rubbish at the end. They stuck to the agreed timelines, and pricing was transparent throughout, with clear communication on any issues as they arose. Overall, I’m really pleased with the result and felt I could trust them throughout. I wouldn’t hesitate to recommend them…”
Sean Kelleher
“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
Frequently Asked Questions
Your questions about loft conversions in Westminster, answered.
How much does a loft conversion cost in Westminster?
Loft costs in Westminster depend on the scheme far more than the floor area. Across SW1A and SW1P, expect roughly £35,000–£45,000 for a rooflight conversion, £45,000–£55,000 for a rear dormer and £65,000++ for a mansard or hip-to-gable. Structure, stair position and access drive the number. Buildaway itemises all of it before you commit.
How long does a loft conversion take in Westminster?
Allow roughly 6–10 weeks of build for a loft in Westminster, plus lead-in for design, Building Control and party-wall notices. In SW1A and SW1P the notices are usually the long pole, not the construction. Buildaway serves them at the start so your programme is not held hostage to a neighbour's response window.
Do I need planning permission for a loft conversion in Westminster?
Sometimes. In Westminster, a rear dormer within volume limits can be permitted development, but the roofscape here is scrutinised and Westminster City Council takes a view on anything visible from the street. Leasehold properties in SW1A and SW1P also need freeholder consent regardless of planning. Buildaway checks all three routes at feasibility.
What types of loft conversion do you offer in Westminster?
All the main types: rooflight, dormer, hip-to-gable and mansard. In Westminster the choice is usually decided by the roof you have and the planning position, not by preference. Buildaway measures headroom and structure across SW1A and SW1P first, then tells you honestly which schemes are actually available to you.
Do Buildaway handle both design and construction for Westminster lofts?
We do the whole thing. Buildaway surveys your Westminster roof, designs a scheme that is actually consentable, serves the notices, and builds it with our own team. One point of contact from feasibility around Smith Square and Millbank to Building Control sign-off.
Are your loft specialists local to Westminster?
We are in Westminster constantly. Buildaway knows SW1A and SW1P roof stock - the headroom you actually get, where the party wall sits, and how Westminster City Council treats dormers here. Local experience makes our feasibility answers reliable rather than optimistic.
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We Serve Westminster and Surrounding Areas
Find us in the heart of Westminster. We are proud to serve our local community.
Ready to Transform Your Loft in Westminster?
With landmark views and unrivalled property values, Westminster demands the highest standards - Buildaway combines expert craftsmanship with luxury design to elevate homes in one of London’s most prestigious locations.