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Mansard loft conversions

If you need more space than a traditional loft conversion, a mansard loft conversion could be your best option. Mansard loft conversions are designed to maximise headroom as well as floor space, providing the most usable living space of any loft conversion.

No matter what type of house you have, a mansard conversion is likely to be suitable, and will give a dramatic new look to your attic space. This is a hugely popular option for extending living space within the city and, once you start looking, you will notice mansard conversions everywhere.

What is a Mansard Conversion?

Mansard loft conversions involve straightening a sloped roof into a near-vertical with a 72-degree gradient. This ingenious design isn't just about aesthetics; it significantly increases the useable interior creating a whole new floor within your existing home. Gone are the days of cramped and awkward attic corners – you now have a spacious canvas for your dream loft.

Mansard designs boast a distinctive elegance, characterised by their near-vertical wall and often incorporating small dormer windows. Many homeowners also choose to include a Juliet balcony. This adds a touch of sophistication and individuality to your property, blending seamlessly with diverse architectural styles.

Mansard conversions are particularly popular in London, where space is often at a premium. They offer a cost-effective way to expand your living space without sacrificing valuable garden area. While the increased space and design potential are key benefits, Mansard conversions offer additional advantages:

  • Natural Light Sanctuary: Large dormer windows and the near-vertical rear wall flood your loft with natural light, creating a bright and airy atmosphere.

  • Privacy Haven: The unique design often allows for secluded entrances and dedicated bathrooms, making your loft a true haven within your home.

  • Investment in Your Future: Not only does a Mansard conversion create a stunning new space, but it also adds significant value to your property, making it a smart investment for future resale.


Unlike most loft conversions, Mansards often require planning permission, due to the significant alteration of your roofline. This process can involve submitting detailed plans, consulting with neighbours, and potentially facing objections. Partnering with experienced architects and builders familiar with local regulations is key to navigate these hurdles smoothly.

Party Wall Agreements: If your property shares a wall with a neighbour, obtaining a party wall agreement might be necessary before construction begins. This legal document outlines responsibilities and safeguards both parties' interests. 

Additional considerations:

  • Timescales: Due to the complexity of Mansard conversions, they often take longer to complete compared to standard loft conversions. Factor this into your planning and ensure you're comfortable with the anticipated timeline.

  • Cost implications: The extensive structural work involved can translate to higher costs compared to other conversion types. Ensure you have a comprehensive budget in place and consider seeking multiple quotes from reputable builders.

  • Potential impact on neighbours: Be mindful of the potential impact of your conversion on your neighbours, particularly regarding noise, dust, and any necessary scaffolding. Proactive communication and addressing concerns early on can foster a positive experience for everyone involved.

An Extra Storey

Thanks to the space a mansard conversion provides, you can consider it as more than a loft conversion; it is a whole new storey for your London home. The way mansard loft conversions look from the outside also looks more like the floors below rather than a typical attic conversion.

The possibilities for utilising your new Mansard space are limitless:

  • Luxurious Retreat: Design a spacious bedroom with vaulted ceilings, a walk-in closet, and an en-suite bathroom – your own private sanctuary within the city.

  • Productivity Hub: Create a dedicated home office bathed in natural light, maximising focus and inspiration.

  • Family Fun Zone: Imagine a games room equipped with consoles, board games, and comfortable seating – the perfect space for creating lasting memories.

  • Movie Magic: Design a media room complete with a projector, surround sound, and plush seating – transform your home into a private cinema experience.

  • Personal Sanctuary: Carve out a playroom for your children, or a dedicated space for your hobbies and passions, whether it's art, music, or simply reading in peace.

Flexibility Unleashed

And if you need even more, the generous space allows for multi-room configurations:

  • Two bedrooms for growing families or accommodating guests.

  • A bedroom with an en-suite or walk-in wardrobe for ultimate indulgence.

  • Two smaller bedrooms and a bathroom for creating dedicated spaces for children or working professionals.

  • An office and a library/hobby room for combining productivity with your passions.

So, step beyond the limitations of ordinary attic conversions and embark on a transformative journey with a Mansard. It's an investment in your future, your comfort, and ultimately, your happiness. Let your imagination soar, and watch your home reach new heights! 

For mansard loft conversions, please call 0800 269765, or 01942 722754 (Head Office) or 0208 7771719 (London Office)


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