L-Shaped Dormer Loft Conversions

At Rooftop Rooms, we specialise in bespoke L-shaped dormer loft conversions and take great pride in the transformations we deliver. An L-shaped dormer conversion is an ideal way to add substantial living space and value to your home. While all loft extensions offer key advantages, L-shaped dormers are exceptionally popular for Victorian and Edwardian properties. Our comprehensive service manages the entire journey—from initial design and planning to final fitting.

Based in Enfield, Rooftop Rooms regularly delivers high-quality loft conversions across North and East London, Hertfordshire, and Essex.

What is an L-Shaped Dormer Loft Conversion?

An L-shaped dormer loft conversion is commonly used in homes with an original two storey rear addition and this design is common in Victorian or Edwardian terraced houses. This design involves constructing two dormers that join together to form an “L” shape.

Before and After

Slide to see the final results of an L-Shaped Dormer Loft Conversion

The Process

At Rooftop Rooms, detail dictates our conversion process. We take every client through from start to finish, through conception and design to completion and signoff.

Initial Consultation

After you first speak to us, we can carry out the initial consultation stages. We will take any measurements that we need, and gain the best understanding of your unique situation. At this point, we can answer any questions you might have, and provide expert guidance.

Paperwork, Planning, Permissions

Our architects will provide you with detailed plans as well as full costings and your quotation. We can make amendments at this stage, and with a plan you are happy with, we can agree on a contract and a start date. Our project coordinator can arrange all necessary planning permissions.

Benefits of an L-Shaped Dormer Loft Conversion

The L-shape blends well with the rear profile of period properties, preserving some architectural character. This type of conversion is highly desirable and can significantly increase the home’s market value.

Maximised Space:
- Creates a large, flat-roofed structure at the rear of the property.
- Ideal for multiple rooms — a bedroom, home office, hobby space, bathroom, or even a self-contained suite
Design Structure:
- The main dormer extends over the main rear roof slope.
- A second dormer is added over the rear outrigger (a lower section of the property, often extending from the main house).
Planning Considerations:
- This type of conversion can be completed under the properties’ permitted development rights.
Cost-Effectiveness:
- Offers a good cost-to-space ratio compared to other types of loft conversions, as the outrigger roof space can be utilised.
Natural Light: Large windows or French doors can be installed in the dormers to flood the new space with light.

Our Latest L-Shaped Dormer Projects

L-Shaped Loft Conversion – Tottenham
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L-Shaped Loft Conversion – Tottenham

Haringey, L-Shaped Dormer, Loft conversions, Our Work, Tottenham

L-Shaped Loft Conversion – Tottenham

L-Shaped Loft Conversion – Walthamstow
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L-Shaped Loft Conversion – Walthamstow

L-Shaped Dormer, Loft conversions, Our Work, Walthamstow

L-Shaped Loft Conversion – Walthamstow

L-Shaped Loft Conversion – Finchley
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L-Shaped Loft Conversion – Finchley

Finchley, L-Shaped Dormer, Loft conversions, Our Work

L-Shaped Loft Conversion – Finchley

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Why Choose Rooftop Rooms?

Established & Trusted

Established in 2004, we have a wealth of experience in our toolkit, and we are experts in all things loft conversions.

Full Project Management

Leave all the tricky details to us. Your project manager will keep you up to date every step of the way.

Bespoke Design & Build

Rooftop Rooms will bring your vision to life – discuss with your dedicated team and plan things your way.

Fully Insured Services

Our work blends aesthetics with safety, and we provide insurance for extra peace of mind.

Get in Touch

If you have any questions about our loft conversions, get in touch today. Rooftop Rooms takes pride in every step of the process, ensuring that you are as happy with the final result as we are. Our team of industry veterans is on hand to discuss your needs and help you understand the process.

We regularly work throughout North and East London, Hertfordshire and Essex.

Call: 020 8367 0066

Let’s Start Planning Your House Transformation

      EXCELLENT  
   Based on 106 reviews 
    
 
 
 
   
 
 
      Posted on Google  
   
   Stuart Empson 
 25 September 2026
 
 
  We would highly recommend Rooftop Rooms to anyone looking to do a loft conversion. From beginning to end, they were excellent. They listened, understood and advised on what was important to us throughout. All their workers were friendly, punctual and quick to address any issues. We’re thrilled with both the end result and the process
  
 
     Posted on Google  
   
   S S 
 23 June 2026
 
 
  We used Rooftop Rooms for a dormer loft conversion in our Victorian terrace last year and were very pleased with the overall experience. From the outset, Colin was clear about what was required and offered some excellent design ideas to help maximise the space. Rooftop Rooms also has a transparent pricing structure, which meant we had a clear understanding of costs from the beginning. As with any construction project, there were a few inevitable teething issues along the way, but Gary was always quick to respond and came to site promptly whenever needed to resolve them—even on bank holidays. Any communication challenges we experienced were generally with subcontractors rather than the Rooftop team themselves, who were consistently professional, polite, and helpful. Sally and Hayley in the office were excellent throughout the project, keeping everything organised and ensuring matters were followed up efficiently. Overall, I would happily recommend Rooftop Rooms. Their transparency, responsiveness, and commitment to customer service made the process much smoother. As with any building project, maintaining clear communication and regular site visits is key, and Rooftop supported this well throughout.
  
 
     Posted on Google  
   
   William Dunbar-Sheppard 
 6 May 2026
 
 
  We used Rooftop rooms for our loft conversion (double dormer in an L shape). We are delighted with the amazing space they have created for our family and the loft was finished to a high standard. Throughout the process, staff in the office and on site were friendly, professional and helpful. They employ highly skilled trades and are experts in this area. Thank you Rooftop rooms!
  
 
     Posted on Google  
   
   Esther Schulze 
 23 February 2026
 
 
  Roof Top Rooms has just completed my loft conversion and the work from start to finish was handled with excellence. All snags were finalised, the whole team from the office to the tradesmen worked efficiently with little mess and were a joy to be around. I'm beyond thrilled with my new bedroom and shower room and I highly recommend Roof Top Rooms.  It wasn't as stressful as I thought it would be.  Special thanks to Gary who managed the project with care, Sally and Hayley for their invaluable advice in the office and their weekly schedules.  Dan, Billie and Terry who built the dormer and the rest of the team (electricians, plasterers, carpenter, plumbers, tiler, snag team) who were all fantastic!
  
 
     Posted on Google  
   
   Patrick Brathwaite 
 22 January 2026
 
 
  A fantastic job by Rooftop Rooms on leaving us with beautiful loft room space. Critical was our project manager and the office in keeping momentum in the work and everything on schedule; and completed well. A big thank you!
  
 
     Posted on Google  
   
   William Myers 
 24 July 2025
 
 
  Rooftop Rooms did a fantastic job on our loft conversion. The bulk of the building work was completed within two months which was greatly appreciated in winter. They gave us lots of good advice throughout the process and were flexible and considerate to the changes we asked for - things like window types and sizes, electrical socket placements, bathroom layout etc. The end result was exactly what we wanted and I would definitely recommend them.
  
 
     Posted on Google  
   
   V Micunovic 
 3 June 2025
 
 
  Really professional.  Always came back to us and were willing to pick up the telephone to answer any questions we had.  Overall very happy with the service and would recommend.
  
 
     Posted on Google  
   
   Peter K 
 22 May 2025
 
 
  We used Rooftop Rooms for a loft conversion: a bedroom + bathroom. Have to say that they were excellent from start to finish.

A couple of elements worth highlighting. Firstly, the advice they offered throughout the process from planning through construction was top notch. They made things really clear and transparent gave us great information.

Secondly, the construction itself was great and carried out to a high standard. Mitch and his crew were really good throughout and it went smoothly and surprisingly quickly. All the carpentry, electrics, plumbing etc. was organised well too.

Gary, who was project managing the whole thing, was also really helpful providing us with advice, running through things with us, and getting any snagging done quickly at the end.

Ultimately, they did everything they said they would, on budget, and did it to the timescales they'd set. We're really pleased with the results - couldn't ask for any more! Thank you Rooftop Rooms!
  
 
     Posted on Google  
   
   Nico Beukes 
 18 May 2025
 
 
  We have used Rooftop Rooms now for the 2nd time to do our loft conversion in Hadley Wood.  It was a big, ambitious project that involved removing the whole roof, lifting the gables on each side and creating 3 x huge dormas at the back, and 2 x dormas in the front.   They employ all their own tradesmen, who are the nicest builders we have ever met.   Most of the employees were still with them from the last time we used them 8 years ago to do our loft conversion in Whetstone, which just show that the company is run by nice people.  They are trustworthy and keep their promises.   Gary and Colin, the two owners, just does not let you down and are always there to ensure that we were happy.   They go out of their way to keep everything on track, and communication was outstanding throughout the 9 month project.   Yes, things can go wrong, but they just on it straight away and sort it out - no questions asked and no quibbles.

We cannot recommend them highly enough.
  
 
     Posted on Google  
   
   Joe Bacon 
 16 May 2025
 
 
  Amazing service and quality of work. Would 100% recommend! Thank you!!!
  
 
     Posted on Google  
   
   KATIE AMOTT 
 23 April 2025
 
 
  We’ve been thoroughly impressed with Rooftop Rooms from start to finish. Our loft conversion was managed brilliantly, with timely and effective communication from Hayley and Sally in the office and our PM Gary was always on hand to advise and support with decisions and things that cropped up along the way. We couldn’t believe how quickly the build took shape, with Adam and the team working incredibly long days to get the roof off and back on again with minimal fuss. Everyone worked so hard. Would recommend!
  
 
     Posted on Google  
   
   Nick Sharp 
 1 April 2025
 
 
  Delighted with the work Rooftop Rooms have done for us to convert our loft to a master bedroom with ensuite and walk in wardrobe.

The build was completed by a highly professional team of reliable and skilled tradesmen. There was good communication from Hayley and Sally and Project Manager Gary ensured everything ran smoothly and was there to answer questions where we had them. The 1st fix carpentry team led by Adam and his team worked long hours and the loft took shape very quickly and it was really impressive how quickly the structural work was completed with then no downtime before the next element of the build.

We're very happy with how the build has turned out and would definitely recommend Rooftop Rooms.