Loft Conversions South West London
Specialist loft conversion builders for SW London homes
Transform your unused loft space into a beautiful, functional room. Expert craftsmanship, transparent pricing, and seamless project delivery.
Dormer, mansard, L-shaped, hip-to-gable and Velux conversions. We understand the structural nuances and planning requirements of South West London's period homes.
Every project is managed by our own team — one point of contact, weekly updates, and a fixed-price contract that means no surprises.
Types of loft conversion
Velux / Rooflight
The most cost-effective option. Works within your existing roof structure, adding high-quality Velux or similar roof windows for natural light without altering the roofline.
£55,000 – £75,000
Rear Dormer
Most popularOur most popular option. Extends the rear roof slope to create full standing headroom — typically large enough for a master bedroom with en-suite bathroom.
£75,000 – £110,000
L-Shaped Dormer
Perfect for Victorian terraces with a rear outrigger. Extends across both the main roof and the addition below.
£90,000 – £140,000
Hip-to-Gable + Dormer
Ideal for semi-detached and detached homes. Extends the sloping side of the roof into a vertical gable wall.
£85,000 – £130,000
Mansard Conversion
The premium option. Restructures the entire rear roof slope to near-vertical, creating maximum internal volume — effectively a full extra floor.
£100,000 – £160,000+
What's included in our loft conversions
Structural Work
Steel beam installation, roof structure modifications, floor reinforcement, dormer or Velux windows
Staircase & Access
Building regulations compliant staircase, fire escape provisions, landing modifications, handrails and balustrades
Insulation & Finishes
High-performance insulation, plasterboard and skimming, decoration ready finish, flooring installation
Services & Compliance
Electrical installation, heating extension, building regulations sign-off, structural engineer's calculations
Additional costs to consider
All prices exclude VAT. En-suite bathrooms are included in dormer and mansard prices above. Fixed price guaranteed once quote is accepted.
How a loft conversion works
Free site visit and feasibility
We visit, measure up, assess the roof structure, check head height and identify any structural constraints. You get honest advice on what is achievable and a realistic budget range.
Frequently asked questions
How much does a loft conversion cost in South West London?+
Loft conversion costs in SW London range from £55,000 for a Velux/rooflight conversion to £160,000+ for a large mansard. Rear dormer conversions, our most popular option, typically cost £75,000–£110,000. L-shaped dormers run £90,000–£140,000 and hip-to-gable conversions £85,000–£130,000. All prices exclude VAT and include structural work, insulation, electrics, staircase, and building regulations sign-off.
Do I need planning permission for a loft conversion?+
Most rear dormer and hip-to-gable conversions fall under Permitted Development and don't require planning permission. However, mansard conversions always require planning approval, and properties in conservation areas may have restricted PD rights. We assess your planning position for free before you commit.
How long does a loft conversion take?+
A typical rear dormer loft conversion takes 8–12 weeks from start to completion. Velux conversions can be faster at 6–8 weeks, while mansard and L-shaped conversions may take 10–14 weeks depending on complexity. We provide a detailed programme before work begins.
Will a loft conversion add value to my home?+
Yes. A well-executed loft conversion typically adds 15–25% to your property value. In South West London, where average house prices exceed £800,000, that can represent £120,000–£200,000+ in added value — significantly more than the cost of the conversion itself.
Can any loft be converted?+
Most lofts can be converted if there's sufficient head height (typically 2.2m at the ridge). Victorian and Edwardian terraces across SW London are ideal candidates. We offer free loft surveys to assess feasibility, check head height, inspect the roof structure, and recommend the best conversion type for your property.
What is included in your loft conversion price?+
Our prices cover the full build: structural steelwork, roof alterations, floor reinforcement, staircase, insulation, electrics, plumbing (if en-suite), plastering, and building regulations sign-off. We also include structural engineer calculations and project management. The price we quote is the price you pay — no hidden extras.
What our clients say
Don't just take our word for it — hear from homeowners across SW London
"Tom was brilliant throughout the whole build process. It was a pleasure to be asked for a website review, after all they did for us. We are truly grateful to the whole team for the level of quality and for continually going the extra mile."
Rowan A
Wandsworth
"Bluebird was recommended to me by our local estate agent. Lovely guys and so pleased decided to go with them. Tom, Milen and the team on site were so professional and couldn't have been more helpful. Very happy clients."
Emma and Tom
Richmond
"The first project we trusted Tom and Milen with was a house conversion into 4 flats. We didn't know it at the time, but using Bluebird for such a big project was the best decision we have made. They are our first call when we find another development."
Tony and Rhys
Putney
Ready to talk about your project?
Free consultation. Transparent, fixed-price quote within 48 hours.