Is a Mansard loft conversion right for your home?

Here at The Loft Room, we offer a range of loft conversion types to suit the needs and specifications of every house and its residents.

With so many loft designs to choose from, several factors such as budgets, available space, and your property’s location can impact the conversion type recommended for your home. As a result, it is vital to understand the differences between each loft conversion to ensure you choose the right option for your needs and circumstances.

Among the different types of conversion — which include hip to gable, Velux, piggyback and various dormers — Mansard loft conversions are a popular choice, being one of the most transformative extensions you can carry out in your home. Mansard conversions are one of the most extensive options you can choose and are the perfect way to maximise the usable space in your loft or attic.

So, what does a Mansard conversion entail, and what must you consider before deciding to go ahead with one of these projects?

The pros and cons of Mansard loft conversions

Mansard loft conversions get their name from the 17th-century French architect Francois Mansard, who first popularised this roof style.

This type of conversion is built along the entire roof plane of a house to create a generous amount of extra space and maximum head height. Typically, Mansard conversions are located at the rear of a property, but they can also sit at the front in some circumstances. A Mansard roof is flat, with a slight fall to allow water drainage, and the face of the extension slopes backwards at 72 degrees.

These spacious, stylish loft conversions are prevalent in London, where homeowners often seek ways to create extra living space. Mansards are usually considered large enough to support multiple room configurations, such as a bedroom and bathroom; some can even feature a balcony!

Many people like that Mansards are aesthetically similar to regular roofs and create the feeling of an additional storey rather than a modified loft. Specialist contractors can match exterior finishes with existing brickwork, fascias, soffits, gutters and windows to blend perfectly with the original property and surrounding homes. A Mansard’s vertical walls provide ample space for decoration and furnishing and invite plenty of natural light with the addition of Velux windows.

Due to the extensive work required to transform loft space into a Mansard conversion, these projects tend to be more expensive than other conversion types. Plus, they often need planning permission as most do not fall within permitted development restrictions. However, with the proper professional guidance, a Mansard loft conversion can create an additional room for your house in weeks.

Considerations for a Mansard conversion project

If the goal of your conversion is to maximise the usable space in your loft, a Mansard roof transformation is an ideal choice. Whether you turn your extra room into an en-suite bedroom, a study or an additional living area, Mansard conversions can create much-needed square footage — and add significant value to your property.

Mansard roofs are suitable for most home types (including terraced, semi-detached and detached houses) and are especially popular for period properties. Still, as with any home renovation, you must confer with your local planning authority about the plans for your Mansard conversion before work can begin.

Experienced surveyors will need to assess your property to determine its suitability for a Mansard conversion, as well as the building and planning regulations it must conform to throughout the loft conversion process. If you own a terraced or semi-detached property, you must inform your neighbours and secure their formal approval for the work ahead, in line with the Party Wall Agreement Act of 1996.

Depending on where you live and the requirements of your project, Mansard conversion costs start at around £40,000 and take approximately eight weeks to finish. Given the extensive nature of a Mansard transformation, we suggest enlisting the help of a qualified consultant to guide you through the process from start to finish and ensure every aspect of the build runs smoothly. Then, once your conversion is complete, you will have a beautiful new space to make your own.

The Loft Room is here to help every homeowner determine which type of loft conversion is best for their property. If you are interested in finding out whether your home could accommodate a Mansard loft conversion, contact our friendly team of specialists today at 0800 002 9291 or email info@the-loftroom.com.

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      EXCELLENT  
   Based on 403 reviews 
    
 
 
 
   
 
 
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   Henry 
 6 October 2026
 
 
  We recently had a rear dormer completed by The Loft Room, which also involved lowering the ceilings throughout the first floor.

The efficiency and quality of the work carried out are the main reasons we’ve given five stars. We felt the administrative and communications side of the process could have been better, but ultimately the most important thing for us was the quality of the build, and in that respect we were extremely happy.

The team on site were excellent and always treated the house as our home rather than simply a building site. They were respectful, tidy and a pleasure to have around throughout the project.

Dragos has been a joy to work with and brought a huge amount of calm, experience and knowledge to the project. Lulian, on site, was the ultimate professional. Nothing was ever too much trouble, and the quality of his workmanship was excellent.

Overall, we’re really pleased with the end result and wouldn’t hesitate to recommend The Loft Room based on the quality of the work and the team we had on site.
  
 
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   Ruth Gibbons O'Brien 
 2 October 2026
 
 
  We are so happy with our new loft space and have been really impressed with The Loft Room from start to finish.

Communication throughout the project has been excellent. Marius and his team worked incredibly hard to meet deadlines while taking great care and pride in their work. Helen in the office, along with Marius, were always on hand to keep us updated on progress and talk us through the different choices and options available.

It was also really helpful having a clear contract in place detailing exactly what was included in the agreed costs. This made budgeting much easier and meant there were no unexpected or surprise costs along the way.

We can’t wait for the final touches to be completed so we can start enjoying our family’s new space. Thank you to the whole team for all your hard work — we’re really happy with the result!
  
 
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   Alex Moon 
 28 September 2026
 
 
  The loft room team were great. John was very respectful, and kept us informed on progress. Going the extra mile to make our new space amazing. They really managed to maximise the floor space to create a great sized master bed and en-suite.
  
 
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   Calum Millar 
 26 September 2026
 
 
  Recently had a dormer loft conversion completed by Ash and Alfie of The Loftroom.

From design all the way through to finishing the construction the team have been great. Quality of the work is outstanding, kept informed and updated all throughout the build, and always consulted about the specifics.

Highly recommend.
  
 
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   Chris Talbot 
 25 September 2026
 
 
  We are delighted with our new loft conversion by The Loft Room. The whole process went incredibly smoothly, from the planning stage all the way through to decorating.

A huge thank you to Vio, who led the team on our project. Vio and the team’s hard work and dedication has transformed our house. Vio kept everything running on track, maintained a high standard of work, and was always a pleasure to deal with. He and his team treated our home with respect and made sure the details were done right. And also, a special mention to all in the office whose excellent communication kept us in the loop throughout.

We would heartily recommend The Loft Room to anyone looking to do a loft conversion. Thanks guys!
  
 
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   Sarah Lister 
 22 September 2026
 
 
  We are delighted with our new loft space! Our team leader, Mihai, was fantastic and kept us informed about progress throughout. Everyone who came to work on the space was friendly and communicative, and gave us advice about what might work best.
Together, the team created a superb space with two bedrooms and a bathroom which are all spacious and finished to a very high standard. Mihai took time to make sure that everything was finished as we wanted it to be and went the extra mile to ensure downstairs where they had broken through was finished and integrated with the existing decor.
The office team at The Loft Room were very helpful in keeping us up to date and checking in to make sure that we were happy with how everything was going. It made such a difference using a company who do loft conversions day in day out as it meant that everything ran smoothly, the project was managed for us and the build ran to the time scale presented to us from the start.
We would highly recommend The Loft Room to anyone who is thinking about creating a new space.
  
 
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   Simon Newell 
 15 September 2026
 
 
  We honestly couldn't recommend The Loft Room highly enough.

Our relationship with them actually started around three years ago when they first came out to quote for our loft conversion. We weren't ready to go ahead at the time, but when we finally decided to push the button this year, The Loft Room were still the company we wanted to use – and we're incredibly pleased that we did.

This was a significant project, creating an entirely new top floor with two bedrooms and two en-suites, all while we continued living in the house as a large family.

From the very beginning, The Loft Room had a genuinely friendly, family-company feel. Everyone we dealt with seemed to care about the project and about making sure we were happy, and they were very conscious throughout that this wasn't just a building site – it was still our family home.

A very special mention has to go to Jamie and Jared, who carried out the build. They were absolutely fantastic. They worked incredibly hard, were friendly, considerate and easy to have around, and we built a really good relationship with them over the course of the project.

Jamie's workmanship and experience were obvious from the start. He constantly kept us involved, asked questions rather than making assumptions and made sure we were happy with how things were progressing. Communication was excellent throughout.

With any building project of this size there are inevitably going to be challenges, changes or occasional delays. For us, the important thing was how these were dealt with. Jamie was always upfront, explained what was happening and kept us updated, so there were never any nasty surprises. If something needed sorting, it was sorted.

That made a huge difference, particularly as I work from home and we were living through the entire build as a family. Jamie and Gared were incredibly respectful of that and did everything they could to minimise the disruption.

Most importantly, we absolutely love what they've created. Turning what was previously unused loft space into two fantastic bedrooms and two en-suites has completely transformed the house. The quality of the workmanship is excellent and, looking at the finished result, we feel we've had really good value for what was a major investment in our home.

It probably says everything about our experience that after months of having Jamie and Jared here every day, we actually miss having them around! I work from home, so it's genuinely strange not having the daily chats anymore.

A really positive experience from the first conversation three years ago right through to completion. We'd happily recommend The Loft Room to anyone considering a loft conversion.

A huge thank you to the whole team – and particularly Jamie and Jared – for everything you've done for us.
  
 
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   Ben Chadwick 
 22 August 2026
 
 
  We have just had our loft completed by the loft room. They were really easy to work with, took care of all the paperwork. They were great at communicating all the stages and their response time was excellent. Adrian was our builder and he was fantastic. Super thorough, reliable, fast, tidy and often gave us suggestions when we were unsure. The whole project was finished in about 6weeks! We wouldn’t hesitate to recommend The Loft Room to anyone. Many thanks!
  
 
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   Ken O'Neill 
 19 August 2026
 
 
  We are so happy we decided to go ahead with The Loft Room. Everyone we met from our initial consultation with Paul to Lulian and his team and Helen and Melissa in the office have been great. We were especially impressed with the hard work of Lulian and his team even through the heatwave. They were friendly and professional and always ready to answer any questions we had. Thanks to Lulian for suggesting bigger Velux windows - they are amazing! All the trades involved were great - we will definitely use them again in the future. The work was completed on time and we are really happy with it. We would certainly recommend The Loft Room.

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