L – Shaped Loft Conversion
Interested in L – Shaped Loft Conversions? Contact Us
LOOKING FOR L – SHAPED LOFT CONVERSIONS?
L-shaped loft conversions can also be known as dog leg conversions. With a property that’s suitable for this type of loft conversion, it is possible to create a huge amount of extra space compared with a conventional loft conversion.
The structure of the roof is one of the things that can affect the type of loft conversion. If your home has an extension to the rear then an L shaped dormer can be a great way to take advantage of the shape of the roof.

Find Out About Design Options For L – Shaped Loft Conversions

What Is An L Shape Loft Conversion?
L-shaped loft conversions typically consist of two dormers, joined together to form the distinctive L-shape. These are most suited to Victorian terrace houses, which often have extensions to the rear that do not go the full width of the property. The L shape can be created as a mansard too which can offer even more space than a dormer.
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Is Planning Permission Required For An L Shaped Loft Conversion?
In most cases L shaped dormers do not need planning permission because everything is within the footprint of the house. That being said, this is something that should be discussed with your planners or designers. All work must be completed to building regulations.
You should always consult a professional because of the complexity of the structure and additional work involved, such as altering drainage and putting in gutters to lead water away from the L shaped dormer.

Interested in L – Shaped Loft Conversions? Contact Us

Contact The Professionals
If you are considering an L shaped loft conversion then Clapham construction can help you design and plan your dream space. It is also an option to include an L shape conversion as part of a larger scheme of works, so if you are having a double-story house extension to the rear of the property then including this at design stage could be a cost effective way to maximise space.
Here at Clapham Construction Service, we’re very familiar with this style of loft conversion and would be only too happy to help you bring your loft conversion dreams to life. The price of a loft conversion can vary greatly depending on the project. It is possible to get ballpark figures, but there are always a variety of things to consider when it comes to pricing a loft conversion.
For more information, or to book one of our free, no-obligation consultations, please don’t hesitate to contact us on 0203 950 7957 today. Our team of loft conversion specialists will be only too happy to offer you any advice and guidance when needed.
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Testimonials
Posted on Andy Brown19/02/2026Trustindex verifies that the original source of the review is Google. From the initial meeting to the final finishing touch, Paul, Dangis and their team were great! We knew exactly what to expect each week, we had lots of photos and drone videos of work happening when we couldn’t see. They were full of advice and suggestions when we couldn’t visualise the end result. They left our home as clean and as tidy as they possibly could (we were living in the house as they were working around us). We are really pleased with the end result and with the building experience! Great time, fantastic work ethic and brilliant result!Posted on Rebecca Barrett15/12/2025Trustindex verifies that the original source of the review is Google. We can’t thank Paul, Dangis, and the team, enough for their hard work on our house. The house is everything we had imagined and more. We increased our scope multiple times throughout the process, and the team helped us seamlessly, and were always there to answer questions and support our plans. We only have good things to say about Clapham Construction, and will definitely be recommending them to all our friends and family. Thanks again!Posted on Helen Stevens03/09/2025Trustindex verifies that the original source of the review is Google. I cannot speak highly enough of Clapham Construction. Paul and Dangis were a dream to work with from start to finish. Everything was communicated so well and they provided honest, transparent and clear advice throughout; I felt supported and guided through all the decisions and they helped me make more bespoke decisions such as our windows and floor which weren’t necessarily easy! Everyone who came to work on the loft was excellent and it has all been completed to a high standard. The loft is beautiful and we just can’t believe how much space we have and how well done everything is. I would (and have!) recommend to anyone! Thank you Paul and Dangis - and we will be coming straight back to you for the next project!Posted on Georgia Beales01/08/2025Trustindex verifies that the original source of the review is Google. We’ve had our dormer loft conversion for coming up to three years now and haven’t had any major issues in this time. Any minor snagging issues have been dealt with quickly by Clapham. The whole process from start to finish was seamless. All the builders were very friendly and considerate too. Will continue to recommend this company to anyone who needs a loft done and will not hesitate to use again in the future. Thank you!Posted on Danilo Rico07/07/2025Trustindex verifies that the original source of the review is Google. Clapham construction service was extremely professional, the project was finished before the plan and we are so happy with our new space. Problems were resolved quickly and efficiently throughout the process. This was one of our best investment that not only added value to our property but also a significant improve of our quality of life.Posted on Joel Prime02/07/2025Trustindex verifies that the original source of the review is Google. I had a loft conversion completed by Clapham Construction Service earlier this year and couldn't be happier with the results. Paul and Dangis were on site every day and kept me fully informed throughout the entire process. Their communication, professionalism, and attention to detail were outstanding. I felt completely confident in their work from start to finish. Highly recommended for anyone looking for reliable and high-quality building services.Posted on Jane Ansell08/05/2025Trustindex verifies that the original source of the review is Google. We recently completed a double mansard loft conversion with Clapham Construction Service, and were very happy with the whole design and build process from start to finish. Paul and Dangis were great to work with, providing clear communication and always being available to answer questions or discuss options. Their team are also excellent, with all the trades doing a great job, very professional and respectful of the rest of our house. Inevitably with a build project there were a couple of issues that cropped up along the way, but CCS were excellent at helping resolve them. We are delighted with the final loft and the extra space, and have already recommended them to others!Posted on Jamie Garratt24/01/2025Trustindex verifies that the original source of the review is Google. We have just completed a loft conversion with Clapham Construction and it was great! We are so pleased with the new loft we have in our house, but the process of working with CC was really good. They were easy to engage with from the outset, the price was competitive and the actual construction was quick and efficient. Obviously it was a major building project with all the mess and decisions you’d expect, but it was made a lot easier and less stressful working with Paul, Dangis and the team. They completed the project on time and on budget and we enjoyed working with them - that is more than almost anyone we know can say about similar projects! We’d definitely recommend them.Posted on Christina Ansong16/10/2024Trustindex verifies that the original source of the review is Google. We had an exceptional experience with Clapham Construction for our loft conversion. Paul, Dangis, and the whole team were fantastic from start to finish. They transformed our attic into two beautiful loft rooms and a bathroom, exceeding our expectations with their attention to detail. The entire project was completed at an impressive speed without compromising quality. The team showed great care throughout, ensuring everything was done to the highest standard. Their service was professional, friendly, and stress-free. We’re absolutely thrilled with the results and would highly recommend Clapham Construction!Posted on Ayan Sengupta31/08/2024Trustindex verifies that the original source of the review is Google. We have recently used Clapham Construction Services for loft conversion to add a bedroom and a bath in the house. We are very happy with the end-to-end experience with Paul, Dangis and the entire CCS team for high quality work done in quick time and with a very collaborative approach. Our overall project went into some unexpected blockers, but Paul and Dangis patiently helped us to resolve all the matters, kept us updated with timely communication and have been very flexible to guide us. They brought in a fantastic team to complete the work fast and in a cost-efficient manner. We will recommend CCS any day as a trusted team for home transformation projects.Google rating score: 5.0 of 5, based on 83 reviews
L SHAPED LOFT CONVERSION - FAQS
What is an L-shaped loft conversion?
An L-shaped loft conversion is a type of extension that combines a rear dormer conversion and a hip to gable conversion. The ‘L’ shape comes from the layout of the conversion, which extends over the rear extension of the house, creating a larger amount of space.
How much does an L-shaped loft conversion cost?
The cost of an L-shaped loft conversion can vary greatly depending on the size of the project, the materials used, and the location of the property. On average, you can expect to pay between £40,000 and £60,000 as a base line.
Do I need planning permission for an L-shaped loft conversion?
In many cases, an L-shaped loft conversion falls under permitted development rights and does not require planning permission. However, this can depend on a number of factors including the size of the conversion and the location of the property. It’s always best to check with your local planning authority.
What kind of design ideas are popular for L-shaped loft conversions?
There are many design possibilities for L-shaped loft conversions. They can be used to create multiple rooms, such as an extra bedroom and a bathroom, or a large master suite with a private bathroom. Some people choose to use the extra space for a home office, a playroom, or a home gym. The design will largely depend on your personal needs and preferences.
Can I do an L-shaped loft conversion on any type of house?
L-shaped loft conversions are typically suited to certain types of properties, such as Victorian terraced houses, which often have an existing rear extension. The ‘L’ shape is formed by extending the loft over this rear extension. If your property doesn’t have a suitable layout, other types of loft conversions may be more appropriate. It’s always best to consult with a loft conversion specialist who can advise on the best solution for your property.

