Design and build specialists
Loft Conversions London
Looking for a loft conversion in London?
Turn your unused loft into a new room that adds space and value to your home. Bedrooms, home offices, playrooms and studios, designed and built around how you live.
Prefer to talk? Call 020 8242 6557
Who we are
One team, from first sketch to final finish
Transform your unused loft space into a new room that adds style, space and value to your home. At Loft Conversions London, we design and build bespoke loft conversions across London. Our team knows how to turn unused attic space into practical rooms that suit the rest of your property.
A loft conversion is one of the most effective ways to gain space without the cost and hassle of moving. Whether you need an extra bedroom, a home office or a playroom for a growing family, we design every project around you. The result is a home that works harder for you and is worth more long term.
We manage the whole process, from design and planning permission to construction and finishing touches. You get clear schedules, regular updates and a dedicated project manager, so you always know what to expect.
And we care about more than the extra space. We take pride in the plastering, brickwork, roofing and finishing, so your loft feels like a natural part of your home. With hundreds of completed projects across London, you can trust us to deliver a loft conversion that adds real value.
Why us
Why choose Loft Conversions London?
Fully custom design and planning
We work to your design ideas and requirements, tailored to your needs.
Price match
Found a cheaper quote? Tell us and we'll match it. Our quotes are clear, with no hidden costs.
Specialist loft modifications
We take on specialist custom work, like Juliet balconies, skylights and more.
Full start-to-finish project management
You get a dedicated project manager for the whole construction phase of your loft.
Experienced team with warranty
Our loft conversion team has been working for over a decade. We offer a full 10-year warranty on the loft conversion.
Insurance-backed deposit and warranty
Every customer gets an insurance-backed deposit and warranty, for peace of mind.
The case for a loft
Why convert your loft in London?
Here are the main reasons homeowners go up, not out.
Planning permission often not needed
Most loft conversions don't need planning permission, unless you're completely changing the roof structure or live in a conservation or heritage area. That makes a loft one of the quickest, least stressful ways to add living space.
Increased property value
A loft conversion adds value to your home. A Nationwide study found a loft conversion can add up to 25% to a property's value. And because a loft is usually cheaper than an extension, it's a strong return on investment.
More space
Use your loft as a bedroom, office, gym, study or hobby room. Whatever you choose, your home will feel bigger once you start using the space.
Save your garden
A loft is built upwards, not outwards, so you add living space and keep your garden. If your garden is small, building up makes even more sense.
Room for a growing family
Kids, or planning to have them? You'll need an extra room. Many families move to get more space, which is stressful and disruptive. Converting your loft lets you stay in the home you love.
Better insulation
Heat rises, and a lot of it escapes through the roof. A loft conversion insulates the roof, floor and walls of the attic, which can cut energy bills across your home.
Less disruption
Compared with an extension, a loft conversion is less disruptive. Most of the work happens in the attic, so there's less dust and fewer materials going through your house. A typical build takes 8 to 10 weeks.
Natural light
Your loft is the highest room in the house, so it can bring in much more sunlight. With windows in the right places, it can be the brightest room you have.
Bespoke loft conversions
Every home is different, so we design each loft around your needs. That could be an extra bedroom with en-suite, a quiet home office or clever storage. Our architectural team takes time to understand what you want, then plans and delivers your conversion with care.
From first sketches to final finish, every detail fits your home and lifestyle. We've completed projects across London boroughs and the surrounding counties, and built a reputation for loft conversions that look good and add lasting value.
Loft finder
Which loft conversion suits your home?
Answer a few quick questions. We'll show the options that usually work for houses like yours.
Usually suitable
This is a guide, not a survey. A free site visit confirms what will work.
Book a free site surveyOptions
Types of loft conversion
Dormer loft conversion
A dormer extends up from the existing roof slope, creating extra floor space and full-height rooms. Rear dormers are especially popular on London terraced and semi-detached homes.
Best for: Victorian terraces, Edwardian houses and many suburban properties.
Read more about dormersHip to gable loft conversion
A hip to gable conversion replaces the sloping side of the roof with a vertical gable wall. It's often combined with a rear dormer to get the most space.
Best for: Semi-detached, detached and end-of-terrace houses with hipped roofs.
Read more about hip to gableRooflight or Velux loft conversion
A rooflight conversion mostly keeps the existing roof shape and uses roof windows to bring in daylight. It needs fewer external changes, but you need enough headroom already.
Best for: Larger or steeper roofs where a big enlargement isn't needed.
Read more about Velux loftsL-shaped dormer loft conversion
An L-shaped dormer combines a dormer over the main roof with another over the rear outrigger. This can give enough space for a large bedroom and bathroom, or sometimes two separate rooms.
Best for: Victorian and Edwardian properties with rear additions.
Read more about L-shaped dormersMansard loft conversion
A mansard substantially changes the rear roof profile to create a large, well-proportioned top floor. It normally needs planning permission, but works very well in dense parts of London.
Best for: Terraced properties where maximising internal space is the priority.
Read more about mansardsBungalow loft conversion
A bungalow's wide footprint can offer real potential for extra bedrooms and bathrooms. The right solution depends on the roof construction, ridge height and where the staircase goes.
Best for: Detached and semi-detached bungalows with suitable roof space.
Read more about bungalow loftsFlat or apartment loft conversion
In a flat, a loft conversion is often the only way to gain extra living space. Check with your leaseholder, freeholder or management company, and your local planning authority, before you start.
Read more about flat conversionsSmall-window dormer
Small-window dormers are usually found on properties in conservation areas. They give a decent amount of extra headroom and can be a good way to add living space in the loft.
Read more about small dormersIdeas
Loft conversion ideas and our top tips for London homes
Your loft can be designed for lots of different uses, including:
Main bedroom and en-suite
Create a private top-floor suite with a double bedroom, fitted storage and a well-planned shower room or bathroom.
Extra family bedroom
Give a growing family the bedroom it needs without the cost and disruption of moving.
Home office
A loft can give you a quieter place to work, away from the busy parts of the house.
Children's bedroom or playroom
Turn the roof space into a practical room that adapts as your children grow.
Guest suite
Add a comfortable bedroom and bathroom for visiting friends and family.
Creative studio or hobby room
Rooflights and dormer windows bring in good natural light for an art studio, music room or flexible creative space.
Before you start
What to know about loft conversions in London
Suitability, planning, timescales and value. Pick a topic.
Loft conversions for London's different property styles
London's housing is very varied. A conversion that works well on a 1930s semi-detached house in Harrow may be completely wrong for a Victorian terrace in Fulham or a conservation-area property in Chiswick.
Our experience includes conversions for:
- Victorian and Edwardian terraced houses
- 1920s and 1930s semi-detached homes
- Detached suburban properties
- End-of-terrace houses with hipped roofs
- Bungalows
- Modern houses
- Conservation-area properties
- Flats and maisonettes, subject to ownership and consent
We design around the existing property: matching staircase profiles, choosing exterior materials that sit comfortably with neighbouring homes, and making the best use of the internal volume.
How it works
Our loft conversion process
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1
Initial consultation
Tell us what you want to achieve, how you'll use the space and your budget.
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2
Free site survey
We inspect the property, assess the roof space and talk through suitable options.
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3
Design and quotation
We develop the design and give you a detailed quote covering the agreed scope.
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4
Planning and technical preparation
We prepare drawings, structural calculations, permissions and building control information before construction.
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5
Loft construction
Our team completes the structural work, roofing, insulation, staircase, services and internal finishing.
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6
Completion and handover
We inspect the finished space, sort any outstanding details and give you the completion documents.
Costs
How much does a loft conversion cost in London?
It's usually the first question people ask. The cost depends on your property, the type of conversion and how you'll use the space.
A simple rooflight conversion is usually cheaper than a full dormer or mansard, because it changes much less of the roof. The bigger the conversion, the more it costs. Jobs with major structural changes, new roof work or several rooms cost the most.
We'll help you understand the costs before you commit. Whether it's an extra bedroom, a home office or a main suite with en-suite, we'll look at your property and quote for the work it needs.
What affects the cost of a loft conversion?
The existing roof structure
Some roofs are much easier to convert than others. A traditional cut roof needs different structural changes from a modern trussed roof. The condition of the existing structure matters too.
The type and size of conversion
A rear dormer usually extends part of the existing roof. A mansard can be a much bigger job and may involve rebuilding a large part of the roof. The more complex the change, the more work involved.
Structural steelwork and floor strengthening
Most loft conversions need a new structural floor designed to carry the extra room. Steel beams, timber joists and other parts are specified for your property.
Staircase design
A new staircase links the loft safely to the house. Where it goes affects the first-floor layout, the space available and the overall cost.
Bathrooms and internal finishes
An en-suite adds plumbing, drainage, ventilation and waterproofing. Bespoke joinery, fitted wardrobes and specialist glazing all affect the final price too.
Our work
Our loft conversion projects
We work with homeowners across London and the Home Counties, from the start of your loft to completion. Want to see a loft we've built near you? Contact us to arrange a site viewing.
Browse projects by area
Case studies by type
Testimonials
Loft Conversions London have been excellent from start to finish with our loft conversion. The communication from Aaron in the office has been great, Marcus and Stuart have supervised the whole project and responded promptly to any minor snags. John was brilliant at starting the building work off, he was very friendly, skilled, and very respectful of our property and privacy, Dean the carpenter did a great job with matching our existing staircase and skirting boards. The roofers and plasterers were all hardworking and easy to have around. The price we paid was the price we were quoted. All in all I would definitely recommend it!
Where we work
Loft conversions across London
We design and build loft conversions across North, West, South, East and Central London, plus selected surrounding areas.
West London
South West London
South and South East London
FAQs
Loft conversion questions, answered
Got a question about loft conversions? Here are the ones we hear most often.
Can't see yours? Call 020 8242 6557 or email us.
It depends on the roof height, pitch, structure, staircase position and planning constraints. There's no single legal minimum ridge height that decides it. A site assessment is the best way to find out what's practical.
Most loft conversions take around 8 to 10 weeks, depending on size and type. The clock starts when materials arrive on site. We'll give you a firmer timeline when we visit. It helps to plan early, so drawings and structural calculations are ready on time.
There's no fixed price, because every property is different. As a 2026 guide: a Velux conversion is around £25,000 to £45,000, a dormer £45,000 to £75,000, a hip to gable £50,000 to £80,000 and a mansard £65,000 to £110,000+. The final cost depends on windows, roofing materials, how you'll use the room, party wall agreements, structural engineering, and decorating and finishes.
We're asked this a lot. Most people stay at home during the work, though it's your call. Our team keeps disruption to a minimum so you can get on with normal life.
Many house loft conversions count as permitted development, but there are limits and conditions. Flats, maisonettes, listed buildings, some conservation-area properties and homes with restricted permitted development rights need extra consideration.
If you live in a semi-detached or terraced house, the Party Wall etc. Act 1996 means you must notify your adjoining neighbours before work starts, so they know about any work affecting shared walls.
Read the government guidance on party wallsYes. Building regulations cover structural stability, floor construction, fire safety, stairs, insulation, ventilation, glazing, drainage and electrical work.
Yes. Figures often quoted are 20% to 25% or more, depending on the size, design, type of loft and quality of finish.
Read more about adding valueUsually, yes. Adding a storey means the stairs, hallway and landing must form a protected escape route. Doors from habitable rooms onto that route normally need to be fire-resisting, so if a fire starts in one room, you have time to get out. Your building control officer confirms the exact rating needed. Many builders fit FD30 doors as standard.
Fill in our contact form or call us. We'll book a site visit to measure up and give you a design consultation. We don't send salespeople, we send people who know lofts. They'll listen to what you want and explain what's possible. If you'd like to go ahead, we'll prepare a quote within a few days.
Free site survey and design consultation
What can we do for your property?
Want to talk through how a loft conversion could work for your home? Email us with any questions. Or fill in the form for a free site survey and design consultation, and we'll get back to you as soon as we can.
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