L-Shaped Dormer Loft Conversion in London

Loft: L-shaped dormer

Maximise your attic with an L-shaped (or “dog leg”) dormer. Perfect for certain types of properties, this loft conversion gives you two sections at right angles, joining at the corner. With all this extra space, you can finally have that guest room, master bedroom, en-suite and walk-in wardrobe you’ve always dreamed of.

What house styles can have an L-shaped loft conversion?

Terraced and semi-detached properties from the Victorian period are most suitable for this project, when they have:

Main roof: larger section placed here, positioned higher up, facing rear
Back extension: for smaller part, lower height, facing neighbour

Wondering what to use each area for? You can usually fit in:

Two bedrooms: larger
One bathroom: smaller
Juliet balcony: rear-facing, for ventilation/light

It makes sense to place the washing facilities at the back, as that’s where you’ll find the soil pipe, so plumbing is much more straightforward.

There are other options, such as:

Study/office
Fitness/yoga studio
Bedroom with dressing room
Playroom/nursery

L-shaped dormer loft conversion planning permission

Keep to certain guidelines and you won’t need planning permission for your expansion, as it’ll come under Permitted Development. These currently include:

No more than 50m³ added (detached/semi), 40m³ (terraces)
Not in conservation district
Not a listed building
No balcony (Juliet allowed)
No materials that aren’t in keeping with original structure

The part facing neighbours might require permission. The company carrying out the work should take into consideration all of these factors.

There are also Building Regulations that your construction firm needs to adhere to. Areas that need to be approved/certified include:

Headroom (2m height usually required)
Roof
Heating
Plumbing
Electricals
Stability of structure
Insulation
Sound proofing
Glass/windows/balconies and flashings
Stairs
Fire safety

L-shaped dormer loft conversion cost

From £50,000

It’s one of the most expensive ways to extend your home, but don’t let that put you off. An L-shaped dormer loft conversion price is high because it adds so much floorspace with usable headroom alongside — almost as much as your existing first floor.

The cost is about £15K more than a standard one, but given that you get another part for an additional room, it’s an investment well worth making. It’ll enlarge your liveable areas significantly, and increase the value of your property should you sell in the future.

Timeframes are longer, naturally, with an average of 7-10 weeks. So it’s understandable that the cost is higher in line with extended labour plus extra materials.

Why choose Fittra?

With 10 years experience we offer an end-to-end service, encompassing:

Free consultations
Planning permission process
Legal advice
Project management
Buying discounts
5% deposit
Tailor-made design
Liability insurance: £5M public/products, £10M employer’s
Considerate Constructors, TrustMark, FMB, NFB accreditations
NHBC-registered

Interested in l-shaped dormer?

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SEE WHAT PEOPLE ARE SAYING

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

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...

Fulham

This project features a complete renovation of a 3-storey terraced house in the heart of Fulham. The project involved extensive work, including the construction of a stunning 4-storey rear extension and a conversion of the roof into a spacious 2nd floor complete with a master bedroom, bathroom, and exercise room. In addition to the extension and conversion, the house now boasts three new...

Sunningdale

A new, stunning renovation project in Sunningdale was completed in partnership with interior design team Falchi Interiors. The project involved a complete overhaul of a detached house, resulting in a spacious, sleek, and modern living space that exudes sophistication and style. The internal layout of the house was reconfigured to maximise natural light and create a seamless flow between ...

Clapham Common

This beautiful renovation features a bespoke wooden staircase with low level wall lights, designed by the client. They match the cedar fencing in the garden, which also has matching storage cupboards and a special pizza-making area. A naturally lit home office sits on the top floor, designed with a touch of minimalism, similar to the rest of the house. The shelves in the bedroom are lit with LE...

Clapham

The client on this project is a designer and a project manager, so working together produced very unique and exciting results. Many of the refurbishment's features were designed by the client, such as the artistic wallpaper and the bespoke joinery package, which was implemented by our experienced joiner. The client was inspired by certain ideas and aesthetics on Pinterest, and it is safe to say...

Wandsworth Common

The property was completely rebranded with organic and rustic designs, infiltrated with contemporary features. A full refurbishment, rear extension and L-shaped dormer transformed this house. All the natural light you can see in the rear extension is thanks to the floor-to-ceiling sliding doors and aluminium skylights. As for comfort, there are walk in showers, wet underfloor heating in ...

Maidenhead

This refurbishment project was absolutely thrilling to accomplish, with a solid team of interior designers and a delightful, intelligible client. Although the 1980s house was structurally complex, with heavy concrete planks in the original structure, as opposed to traditional wood, our team managed to support the existing structures and integrate new features to modernise the antique aesthetic....

Do you have questions?

Frequently Asked Questions

Do you need planning permission for L shape dormer?

The majority of L-shaped dormer loft conversions do not require planning permission as they usually fall within the 40/50 cubic metres which is allowed under UK Permitted Development rules

What is an L-shaped dormer loft conversion?

An L-shaped dormer conversion is where two dormer builds are constructed in a way that they join together. Usually one dormer will be built on the rear outrigger roof and the other on the main roof, which is what gives it the instantly recognisable L-shape.

Do all loft conversions need steel beams?

Structural integrity is key in any loft conversion. Steel beams are the most commonly used within loft conversions, particularly as they offer more flexibility in terms of structure.

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