Dormer loft conversion cost in London

Loft conversion: Dormer

There’s good reason why this type of home improvement is the most popular way to expand into your attic. Increase the headroom, usable floorspace, light and liveability at the apex of your house with this flat-roof, straight-wall extension.

Dormer loft conversion cost

Starts from £35,000

Naturally, the end cost of a dormer loft conversion is based on size, shape and finish, plus the current roof structure/pitch. If you choose an L-shaped version, the cost is around £15K more.

There are many aspects that make up the final cost to take into consideration. The structural work includes:

Construction of the “box”
Windows
Floor reinforcement
Staircase
Insulation
Additional skylights
Heat source
Electrical work
Plumbing pipework
Lighting
Built-in eaves cupboards
Safety measures

The decorative, cosmetic finish plus fixtures and fittings include:

Flooring: carpets/tiles/vinyl
Walls: painted/papered
Lights: shades
Bathroom: basin/tub/shower
Freestanding accessories: storage/furniture

Dormer loft conversion options

Want to expand to the side, rear, or both?
How will you use the space?

Many homeowners extend on the back of their property. To maximise space you can go further to create an L-shaped style too.

It takes on average six to eight weeks to complete building, then add on the finishing touches.

Dormer roof conversion planning permission

Significant home improvement work is much easier when it falls under Permitted Development. This project can do so, as long as it complies with certain requirements, such as:

Height not exceeding original roof
Square footage below a certain amount (semis/detacheds’ total is larger than terraces)
Neighbours unaffected (no overshadowing/overlooking)
No balconies (except Juliet style)
Materials match character of property

Even when all of these guidelines are met, you still need a Lawful Development Certificate.

Planning permission is necessary for those living in a designated conservation area and/or a listed building.

You also need to be sure the work adheres to Building Regulations. These include:

Fire safety measures
Sound proofing
Insulation
Design of stars
Requisite headroom

Your building company will advise you on all of the legal requirements.

How Fittra can help

Our team has 10 years experience helping London homeowners achieve the dormer loft conversion of their dreams. We provide:

Complimentary consultations
Bespoke design
Project management
Straightforward payment schedule
10% deposit
Trade discount benefits
Legal advice
Planning permission applications
Liability insurance: £10M employer’s, £5M public/products
NHBC-registered
Accreditations: FMB, NFB, Considerate Constructors, TrustMark

We look forward to hearing from you.

Interested in dormer conversion?

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Testimonials

Team at Fittra possesses all the attributes necessary to be an excellent contractor: they know their market extremely well; they are diligent, responsive, and yet very understanding with their clients. They are very professional and offer cost saving alternatives when possible. The thing that has impressed me the most is the professionalism, knowledge and helpfulness of all the workers. Hanwell, New Build

We did our house fully renovation last year July 2019 – December 2019 with Fittra. We are very pleased with the results – our new kitchen (rear extension with lantern roof light), loft conversion, hardwood flooring, underfloor heating, tiling and etc.. Ivan and his team are truly professional. They finished the job with timely manner and customer satisfaction. Their breakdown quotes are easy to understand and easy to work with. We are highly recommended for Ivan, Igor and the team. Great job!!! Isleworth

The work that Fittra did for me was a full house renovation – this did not include any new build or extension work but it did include moving a number of internal load bearing walls and extending external openings to install large sliding doors. The work was reasonably complex structurally as the upper floor is steel beam and concrete block construction. Externally all windows and doors were changed, guttering and fascias were changed and a new tiled deck constructed to give an outside/inside feel. Internally, walls were moved, new door openings created or widened to give a modern open plan look and feel. Maidenhead

Fittra completed a rear extension, loft conversion and full refurbishment of our house in Ealing late last year. This included new bathrooms, heating system (including underfloor heating), electrics and plumbing. When obtaining quotes, Fittra’s prices were in the middle of the three companies who came back to us with costs, but the fact that it was fully itemised (unlike the other costs we received) gave us piece of mind that we knew exactly what we were getting for our money. Ealing

Can’t speak highly enough of Fittra and the job they did. They completed a rear extension, side return and loft extension and pretty much a full refurbishment of our house and garden in SW London. They not only did an incredible job, but they were also great to work with too. Vadym and Ivan’s team were incredibly efficient and hardworking and really amenable and collaborative. I have recommended them to a few friends subsequently, and will continue to do so. Wandsworth

Our Projects

Twickenham Renovation: Where History Meets Modern Elegance

In the picturesque setting of Twickenham, our latest project breathes new life into a two-storey end-of-terrace house, marrying high-quality renovation with historical charm. The addition of a loft extension introduces a spacious family bedroom with an en-suite and a study enhancing the home’s functionality and appeal. The renovation encompasses a thorough overhaul of the interior, inclu...

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In Earls Court, a landmark project designed by Leufroy and Teo Architects, and built by Fittra, breathes new life into a Victorian building, converting it into three luxury apartments across 400 square meters. As the main contractor, Fittra has masterfully executed an extensive renovation, including a new basement and a rooftop terrace with exclusive amenities like a barbecue and lounge area....

Earls Court Transformation: Luxury Living

In the heart of Earl’s Court, London, a five-story edifice has been transformed through an extensive renovation, culminating in the creation of 10 exquisite studio apartments, each designed to cater for the discerning tastes of professionals. This project, characterised by its comprehensive overhaul both inside and out, showcases oak flooring, bespoke joinery, and wardrobes, maximising every in...

Slough

Modern Living Redefined in Slough's New Development On the outskirts of London, in a popular residential area of Slough, a new development project introduces a modern two-storey, five-bedroom house that redefines suburban living. This new build combines the latest in architectural design with the comforts of home, creating a perfect setting for family life. The house is designed w...

Raynes Park

Modern Makeover in Rayners Park with Loft Extension In Raynes Park, an extensive renovation transforms a detached property, introducing a modern loft extension above the garage. This project enhances the home's functionality and aesthetic appeal, blending traditional charm with contemporary design. The loft extension adds valuable living space, adaptable for various uses such as a...

West Brompton

Chelsea Charm Reimagined in West Brompton In the prestigious neighborhood of Chelsea, a two-bedroom apartment from the 1880s has been meticulously renovated, marrying its historical essence with modern elegance. Located in West Brompton, this project involved significant structural changes, the introduction of soundproofed oak flooring, and bespoke internal doors that pay homage to the a...

Chelsea

In Chelsea, a five-story building underwent an extensive renovation process to achieve high standards of sophistication and luxury. We worked alongside an investment company to create six stunning two/three-bedroom apartments that combine comfort and elegance. Throughout the apartments, oak floors were used, and bespoke joinery and wardrobes were installed, ensuring that every space was ...

Brompton

This project features a full renovation of a block of 10 studio apartments within a 5-storey building in the Brompton. Working closely with an investment management company, our goal was to create exceptional living spaces that would attract young, successful professionals. Each studio apartment was thoughtfully designed to maximise space and functionality, while incorporating stylish an...

Do you have questions?

Frequently Asked Questions

Do you need planning permission for dormer loft conversion?

In most cases, you don’t need to apply for planning permission for a dormer loft conversion. This is because the structure won’t usually require any dramatic changes to the exterior of your home, so the work is usually classed as permitted development.

Is a dormer loft conversion worth it?

Recent research carried out by the Nationwide Building Society has shown that by converting a loft space, your house value can increase by as much as 20%. As well as creating the extra space and adding value, a loft conversion can even make your home more energy-efficient.

What is the cheapest loft conversion?

A roof light loft conversion is the easiest and most affordable type of loft conversion. These types of loft conversion are quite basic. They only consist of reinforcing the attic floor and adding windows.

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