Mansard Loft Conversions in London

We’re a London-based design and build company specialising in loft conversions, basement conversions, and home extensions. Transform unused spaces into a Mansard loft conversion, giving you maximum space within your loft extension.

A mansard loft conversion involves altering the shape of the roof, typically creating a flat roof with a steep rear wall to significantly increase both floor space and headroom.

Mansard conversions are particularly popular across London, especially on terraced properties where homeowners want to create a substantial new living space that feels more like a full additional storey.

Advantages

  • Creates a significant amount of additional floor space.
  • Provides excellent headroom across most of the new room.
  • Can accommodate larger bedrooms, bathrooms, home offices or even multiple rooms.
  • Blends well with many traditional London properties when designed sympathetically.

Best suited for

  • Terraced and period properties where maximising loft space is the priority.
  • Homes where the existing roof shape provides limited usable space.
  • Homeowners looking to create a larger, more substantial loft conversion.

Unlike many standard dormer conversions, a mansard conversion will usually require planning permission due to the extent of the changes being made to the roof.

Why choose us?

Bespoke designs & planning

Unique to your home.

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Fixed price

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Full project management

Through to completion.

House Extension Types

There are several types of Mansard loft conversions, each offering different looks and levels of space. Here are a few common options:

Rear Mansard

A rear mansard replaces the existing rear roof slope with a much steeper structure, creating significantly more floor space and headroom. It’s a popular option for homeowners looking to create a spacious bedroom, bathroom, office or combination of rooms.

Double Front and Back Mansard

A double mansard alters both the front and rear roof slopes to create the maximum possible amount of usable loft space. The result can feel much more like adding an entirely new storey to the property rather than simply converting the existing loft.

Terrace Mansard

A mansard with a roof terrace combines additional internal living space with a private outdoor area at roof level. It can be a great solution for London properties where external space is limited, subject to the necessary planning and design considerations.

L-Shape Mansard

An L-shaped mansard extends across both the main roof and the rear outrigger, creating a much larger and more versatile loft space. It’s particularly well suited to Victorian and Edwardian terraced homes where homeowners want to maximise the available footprint.

Our initial visit and quotes are free, so if you have a space you’d like to see transformed, simply contact us.

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Trusted by homeowners across the UK

Lindsey Woodward profile picture
Lindsey Woodward
2 months ago
Fantastic attic conversion with SimplyEasy. Our project manager Ben was amazing throughout the whole process. We were kept informed on every detail at every stage. The work was carried out really fast and finished on time. Highly recommend for any work you need on your home!!!
Logan Max profile picture
Logan Max
3 months ago
SimplyEasy Refurbs provided a fantastic bespoke design for our project – they really listened to what we wanted, came up with clever, space‑saving ideas, and delivered a finished result that feels perfectly tailored to our home
Kevin Lieng profile picture
Kevin Lieng
5 months ago
We recently had our loft converted and are absolutely delighted with the result. From the very first meeting with Seb, who took the time to explain all the options and answer our questions, we felt confident we had chosen the right company. He was knowledgeable, professional, and never made us feel pressured at any stage.
Throughout the project, Marius was our project manager. He kept everything running smoothly, communicated clearly, and ensured the work was completed to a very high standard. Marius’s team was very good, hardworking, and clearly took pride in their work, which really showed in the final finish.
The workmanship throughout was outstanding, and the finished loft has completely transformed our home. The attention to detail, quality of finish, and professionalism shown throughout the project exceeded our expectations.
A big thank you to Seb, Marius, and the entire team for delivering such a fantastic loft conversion. We would highly recommend this company to anyone looking to add valuable space and improve their home
Robert Baylay-Bell profile picture
Robert Baylay-Bell
5 months ago
I initially came across Simply Easy Refurbs (SER) online and followed their work for some time before my project reached the right stage. When I was ready to proceed, they were one of three companies I invited to quote.

From the outset, SER stood out for their efficiency, professionalism and clear understanding of the brief. As part of my due diligence, I spoke with three of their previous clients, all of whom gave strong, consistent feedback. This gave me the confidence to appoint them for a full refurbishment, including a loft conversion and rear extension.

Throughout the project, SER maintained a high standard of professionalism. Communication was consistent, with regular check-ins to ensure everything remained on track and aligned with expectations.

I would not hesitate to recommend Simply Easy Refurbs to anyone considering a full home refurbishment.
Katrina Gimbrere profile picture
Katrina Gimbrere
6 months ago
We used Simple Easy Refurbs to do our loft conversion and are very happy with the service. They used highly skilled builders and helped us resolve any issues that did crop up. They communicated well and I would recommend them to anyone looking to convert their loft.
Vanessa Pinnock profile picture
Vanessa Pinnock
7 months ago
Brilliant execution
We had a very good experience with Simply Easy Refurbs, the communication was always on point whether email, what's app or telephone. The dedicated what's app group is a great platform to check on the progress, share ideas visually etc. We had a good working relationship with all the team but especially with Tomas, our design was executed to a very high standard. All the works carried out was highly professional, done to a high standard and good quality materials were used. All the tradesmen involved worked exceptionally hard sometimes staying later than expected just to get the job done!
We're very happy with the end result. We have a future proof, modern design and the loft conversion has created so much space! We would highly recommend this firm for renovation projects! Thanks again to Seb, Tomas and the team.
Nick Hodgson profile picture
Nick Hodgson
1 year ago
We had a great experience with Sebastian and his team. Our mansard loft conversion has added a whole new floor to our flat and provided an amazing new bedroom for our daughter. Our builder Loren and his team were excellent - the work was done on time and to cost; any issues were swiftly dealt with. As expected, we had to get a fire sprinkler system installed - with hindsight we could have started shopping around for a company to do it before building control confirmed it would be necessary; but we were lucky - we found a company who could do it quickly and that meant there was no delay to our project. The aftercare has been fabulous - only today their electrician came back to move a fan in the new bathroom ceiling that was in the way of our new cupboard doors. We couldn’t have asked for more from SimplyEasy Refurbs: we’d recommend them 100%.
I had a very specific idea for my loft and the team made it happen. Great advice, great quality work. I had so many positive comments from friends and relatives. Also, I recently put my house on the market and viewers loved the loft, I have no doubt that the loft helped my house sell faster. Plus, you pay for what you signed for, no hidden fees, furthermore timing was again to what was agreed! I would have no hesitation to recommend SimplyEasy Refurbs!
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Mansard Loft Conversions

What is a mansard loft conversion?

A mansard loft conversion alters the existing roof structure to create a much larger and more usable living space. It typically features a flat or almost flat roof with steeply sloping walls, allowing homeowners to maximise both floor space and headroom.

Do I need planning permission for a mansard loft conversion in London?

In most cases, a mansard loft conversion will require planning permission because it involves making significant changes to the shape and structure of the existing roof. Planning requirements can vary between London boroughs, particularly for conservation areas and listed buildings, so it is important to check the requirements for your property before work begins.

How much does a mansard loft conversion cost in London?

The cost of a mansard loft conversion in London depends on the size of the property, structural requirements, specification and level of finish. Mansard conversions are generally more extensive than standard dormer loft conversions, so a detailed survey and design consultation is normally required before an accurate quotation can be provided.

How long does a mansard loft conversion take?

A typical mansard loft conversion can take several months from the start of construction, depending on the size and complexity of the project. The overall timeframe should also allow for architectural design, planning permission, structural calculations and building control approval before construction begins.

Is a mansard loft conversion suitable for a terraced house?

Yes, mansard loft conversions are particularly popular for Victorian and Edwardian terraced properties across London. They can significantly increase the usable space within the roof and are often ideal for creating additional bedrooms, bathrooms, home offices or a larger master suite.

What is the difference between a mansard and a dormer loft conversion?

A dormer loft conversion extends a section of the existing roof, while a mansard conversion usually involves altering a much larger proportion of the roof structure. As a result, mansard loft conversions can create considerably more floor space and often feel more like an additional storey to the property.

Can I add a roof terrace to a mansard loft conversion?

It may be possible to incorporate a roof terrace into a mansard loft conversion, depending on the property, surrounding homes and local planning requirements. Roof terraces usually require planning permission, with factors such as overlooking, privacy, access and the impact on neighbouring properties taken into consideration.

Enhance Your Home with a Mansard Loft Conversion

To learn more about the benefits of loft conversions or to discuss your property in more detail, talk to our experienced SimplyEasy Refurbs team today.

We’re a member of the Federation of Master Builders, and offer free quotes and price matching on all projects.