Mansard Loft Conversion
LOFT CONVERSIONS FOR OVER 20 YEARS!
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WHAT IS A MANSARD LOFT CONVERSION?
A Mansard loft conversion is a popular type of home renovation that maximises the available space in your loft. Named after the 17th-century French architect François Mansart, this conversion style is characterised by a flat roof and a back wall slope inward at an angle of 72 degrees. The windows are typically housed within small dormers, giving the loft conversion a unique aesthetic appeal.
This type of loft conversion is often more complex and time-consuming than other types, such as dormer or hip-to-gable conversions. However, the result is a spacious and light-filled room that blends seamlessly with the rest of the house, making it an attractive option for homeowners.


IS YOUR LONDON HOME SUITABLE FOR A MANSARD LOFT CONVERSION?
Determining the suitability of your home for a Mansard loft conversion involves considering several key factors. The structural integrity and design of your property, the available loft space, and local planning regulations all play a significant role in this assessment.
The existing loft space is a crucial consideration. A Mansard conversion requires a certain amount of head height to ensure the new space is comfortable and functional. A minimum height of 2.2 metres is generally recommended. If your loft space doesn’t currently meet this requirement, certain adjustments, such as lowering the ceilings of the rooms below, may be necessary.
Local planning regulations can also influence the feasibility of a Mansard conversion. Some areas, particularly conservation areas, may have restrictions on the type of alterations you can make to your property.
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TYPES OF MANSARD LOFT CONVERSIONS: L-SHAPED AND MORE
Mansard loft conversions come in different types, each offering unique features and benefits. The two main types are the standard Mansard and the L-shaped Mansard.
Standard Mansard Loft Conversion: This is the most common type of Mansard conversion. It involves modifying one or both sides of the roof to create a flat roof and steeply sloped walls. This type of conversion is suitable for most property types and offers a significant increase in living space.
L-Shaped Mansard Loft Conversion: This type of conversion is typically suitable for properties with an existing back addition, such as a kitchen or bathroom extension. The L-shaped Mansard conversion extends over this back addition, creating an ‘L’ shape when viewed from above. This type of conversion offers even more space and is particularly popular for terraced houses.


BENEFITS OF A MANSARD LOFT CONVERSION
Choosing a Mansard loft conversion comes with a host of benefits that make it a popular choice among homeowners. Here are some of the key advantages:
Increased Living Space: Mansard conversions effectively utilise the loft space, providing additional room that can be used as a bedroom, office, or entertainment area.
Property Value Boost: By adding extra living space, a Mansard conversion can significantly increase the value of your property, making it a wise investment.
Design Flexibility: The unique structure of a Mansard conversion allows for greater flexibility in design and layout, enabling you to customise the space to your specific needs and preferences.
Natural Light: The inclusion of dormer windows in a Mansard conversion ensures ample natural light, creating a bright and airy space.
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UNDERSTANDING PLANNING PERMISSION FOR MANSARD LOFT CONVERSIONS
Planning permission is a critical aspect to consider when planning a Mansard loft conversion. While some loft conversions fall under ‘Permitted Development’ rights and do not require planning permission, this is not always the case for Mansard conversions due to their more significant structural changes.
In general, Mansard conversions often require planning permission due to the alterations to the roof shape and structure. However, this can vary depending on your location and the specific rules of your local planning authority.
If your property is in a conservation area or is a listed building, you will likely need to apply for planning permission. It’s also important to note that even if your conversion does fall under Permitted Development, you may still wish to apply for a Lawful Development Certificate. This certificate is not the same as planning permission but serves as proof that your conversion is lawful, which can be beneficial when selling your property.
Always consult with your local planning authority or a planning professional before proceeding with a Mansard loft conversion to ensure you comply with all necessary regulations and requirements.


COST OF A MANSARD LOFT CONVERSION IN LONDON
The cost of a Mansard loft conversion in London can vary significantly based on several factors. These include the size and structure of your loft, the complexity of the design, the materials used, and whether any additional modifications to your property are required.
While it’s difficult to provide an exact figure without a detailed assessment of your property, it’s important to note that Mansard conversions are typically more expensive than other types of loft conversions due to the extensive structural changes involved.
Despite the higher initial cost, a Mansard loft conversion can be a worthwhile investment. The significant increase in living space can greatly enhance your property’s value, often covering the cost of the conversion in the long term.
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MANSARD LOFT CONVERSION AS HOME OFFICES, GAMES ROOMS, OR CINEMA ROOMS
One of the greatest advantages of a Mansard loft conversion is its versatility. The additional space can be tailored to your specific needs, whether that’s a home office, a games room, or a cinema room.
Home Office: With more people working from home than ever before, a quiet, dedicated workspace has become a necessity for many. A Mansard conversion can provide the perfect solution, offering a separate area away from the hustle and bustle of the rest of the house.
Games Room: Whether you’re a gaming enthusiast or have children who need their own play space, a Mansard conversion can be transformed into the ultimate games room. The ample space and potential for soundproofing make it ideal for this purpose.
Cinema Room: Imagine having your own private cinema at home. A Mansard conversion provides enough space to house a large screen, comfortable seating, and even a popcorn machine for the ultimate movie night experience.
The possibilities are endless with a Mansard loft conversion. Whatever your needs or lifestyle, this type of conversion can provide the extra space you need to enhance your home and lifestyle.


THE ARCHITECTURAL APPEAL OF MANSARD LOFT CONVERSIONS
Mansard loft conversions are not just practical; they also offer significant architectural appeal. The distinctive design, characterised by a flat roof and inward sloping walls, adds a touch of elegance and sophistication to any property. The small dormer windows typically used in Mansard conversions contribute to this aesthetic appeal, providing a unique and attractive exterior that stands out from traditional loft conversions.
ENERGY EFFICIENCY CONSIDERATIONS FOR MANSARD LOFT CONVERSIONS
When planning a Mansard loft conversion, it’s essential to consider energy efficiency. The design and construction of the conversion can significantly impact the thermal performance of your home. Proper insulation is crucial to prevent heat loss, reduce energy bills, and create a comfortable living environment. Additionally, choosing energy-efficient windows can further enhance the energy performance of your Mansard conversion.
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MAXIMISING SPACE: STORAGE SOLUTIONS IN MANSARD LOFT CONVERSIONS
One of the key benefits of a Mansard loft conversion is the additional space it provides. However, to make the most of this space, effective storage solutions are essential. Built-in storage, such as a loft walk in wardrobe, can be integrated into the design of the conversion, providing practical storage without compromising on living space. Additionally, the unique shape of a Mansard conversion offers opportunities for creative storage solutions, such as under-eaves storage.
FUTURE-PROOFING YOUR HOME WITH A MANSARD LOFT CONVERSION
A Mansard loft conversion is not just a short-term solution for space issues; it’s also a way to future-proof your home. Whether your family is growing, or you need more space for hobbies or work, a Mansard conversion provides the flexibility to adapt to your changing needs. Furthermore, the added value that a Mansard conversion brings to your property makes it a sound investment for the future.


WHY CHOOSE CLAPHAM CONSTRUCTION?
Mansard loft conversions are often very cost-effective and simple to construct, yet another bonus of this particular option, and are suited to a number of style properties too. From detached to semi-detached, terraced to chalets and even bungalows, these typically are all suitable for Mansard loft conversions.
Of course, having an expert take a look to give you the thumbs up is the only way you’ll know and thankfully, here at Clapham Construction Service, we offer a free, no-obligation consultation. If you’d like to book one of our complimentary consultations, please don’t hesitate to contact us today on 0203 950 7957. Our team of loft specialists will be only too happy to help, offering as much advice and guidance as you need to make the most informed decision possible.
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Testimonials
Georgia Beales2025-08-01Trustindex 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! Danilo Rico2025-07-07Trustindex 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. Joel Prime2025-07-02Trustindex 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. Jane Ansell2025-05-08Trustindex 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! Jamie Garratt2025-01-24Trustindex 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. Christina Ansong2024-10-16Trustindex 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! Ayan Sengupta2024-08-31Trustindex 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. Dani Carter2024-07-02Trustindex verifies that the original source of the review is Google. 2024 Review - Part 2 Building a whole new kitchen and taking down every wall is not for the faint hearted. We took a number of years to decide and raise the funds. At tender stage, Clapham Construction, the top team who built our loft 2 years previously (see the other review below), suggested they might have space to take on the project. It was a key decision. From the off they worked tirelessly to keep the build on time and worked hard with us to keep it on budget. Paul or Dangis were on site daily managing the teams and fielding our endless questions. There were obviously bumps, stresses and challenges, it was a rollercoaster; but the high level of communication and attention to detail was exceptional. And all done with great humour and calm disposition. Not only did they take the time to manage the teams and us, they also helped with every niggle on the way - from architects, to delays with the door supplier we had sourced independently. We are now in the extremely fortunate position of having a space we could only have dreamed about. This would not have been possible without Paul and Dangis and the Clapham Construction team. In addition, they are just lovely people who are a joy to have in our home. Not the most essential thing you might think when hiring a build team, but actually crucial in the day to day grind of chaos and dust. We are hugely, eternally grateful and I just cannot recommend them enough. 2022 Review - Part 1 Absolute professionals is the first thing you need to know about Clapham Construction service. And there are two further things: they are brilliant at what they do and they are generous in spirit. Throughout our project Paul and Dangis answered our naive questions with warmth and care. They helped guide us at every turn, and almost certainly saved us money by making sure we considered all the options we had before making key decisions. But not just customer care, the building work is also top notch. The build itself was a well oiled process, coordinated with skill. I was initially worried about getting an anonymous loft company I'd never heard of in (after getting 8 different quotes from a variety of places including famous local ones) and being part of the 'box on the roof' brigade. Yet somehow, they have created build magic with some tweaks on 'a little bit of height' here, and 'a little configuration' there. We keep marvelling at the sturdiness and smoothness of the physical build even now, and the army of highly skilled teams they have were a pleasure to host in the house while we worked from home. And finally the most important bit - the money stuff- our Loft extension (including bathroom) was completed on time and more or less on budget. The additional costs were the unforseen (yikes victorian chimney ) and a few flourishes that we ourselves added to the mix (make everything gold). Any additional build costs were communicated efficiently and immediately. Our experience of Clapham Construction is that they are patient, hugely knowledgable, and detail orientated with a wealth of incredible advice. Book them now if they have a slot! Davina combes2024-06-19Trustindex verifies that the original source of the review is Google. I recently finished a loft conversion (2BR plus a bathroom) with CCS and couldn’t be happier with the new space. The process could not have gone smoother thanks to Paul, Dangis and their fantastic teams professionalism and attention to detail. They stayed on the timeline that was agreed despite terrible weather conditions which they worked around without any issues reassuming me every step of the way. I have a few more projects around the house and will definitely be looking forward to working with them again. Thanks Paul, Dangis and the CCS team. Freddie R2024-03-26Trustindex verifies that the original source of the review is Google. Paul and Dangis come highly recommended, they completed the conversion of our loft into an L-shaped mansard providing an additional 2 bedrooms and en-suite. From initial engagement, Paul and Dangis couldn’t have been more helpful, providing us with the necessary information and quotation in order for us to make the decision to undertake the works to the property. We have now lived in the finish product for over 6 months and feel that if we needed CCS assistance then they are still at the end of the phone. In summary, we are thrilled with the product, and the process was made simple - 10/10!
Google rating score:5.0 of 5,based on 54 reviews