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Welcome to SMA Lofts

Loft conversion Costs / Loft conversion prices… Look no further.

Inspired Designs | Superb Quality | Unbeatable Service

Local Loft Conversion Experts in London

You’re happy in your home, it’s exactly as you want but you just need some extra space. You know the best solution is to convert that dusty, old loft. You’ve made the decision but the question is where to begin?

Your life is busy, there are not enough hours in the day… you simply don’t have time to do the research – Why not let us take the strain and make the journey simple and worry free? We will help you avoid the common pitfalls & ensure your project is fully protected.

  • Our quotations are clear and concise, clearly stating what is and what is not included, so no ambiguity
  • Our teams only work for us, many for over 10 years, so no sub-contracted work
  • Consistently high quality work as attested to by our client referrals provided within the quotation
  • Our genuine 10 year fully transferable warranty offers both you & your neighbours peace of mind
  • Full public and employee liability insurance for you and your neighbours protection

SMA Lofts is here to help you every step of the way!

We will guide you through the whole process from initial conceptual drawings to completed build. We’ve been doing just that, continuously, for local clients like yourselves, for the last 18 years!

Velux© Style Loft Conversions
velux-loft-icon2 A Velux Loft Conversion is one of the easiest ways to convert your wasted roof space into a useable space for any number of purposes. Velux roof windows are designed to fit flush with your current roof line which leaves your existing structure as is with minor outdoor work required.
Dormer Style Loft Conversions
velux-loft-icon2The most common type of Loft Conversion is a Dormer Loft conversion because it offers the most space when converting your roof space to a living space. A Dormer Loft Conversion is where we make an extension to your existing slopping roof which projects vertically out to create the new living space. Inside, the Dormer Loft Conversion has vertical walls and horizontal ceilings creating more space than the normal angled walls that you would typically expect with a loft Conversion.
Mansard Style Loft Conversions
velux-loft-icon2The Mansard Loft Conversion offers a more traditional extension to your home and frees up large area for family rooms and large master bedrooms with ensuites. A Mansard has a flat roof area and is usually situated at the back of your home with a back sloping roof as shown. The slopping back roof usually has windows installed but a mansard offers many alternatives and is one of the most versatile Loft Conversions available.
Hip-to-Gable Style Loft Conversions
velux-loft-icon2Another popular option is to carry out a hip-to-gable loft conversion. This involves converting the hip (sloped) side of the roof into a flat edge which provides additional space inside the loft.

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Why Choose Us

      • Loft Conversions Specialists
      • Fixed Price Quote – No Surprises
      • All Works Fully Insured
      • Fully Qualified Expert Builders
      • Over 1700 Lofts Completed in 18 Years

Make an enquiry

Please submit your enquiry using the form below or call us on 020 8537 0361 or our freephone number 0800 068 4606 and one of our team will get back to you within 24hrs.

Before submitting your enquiry below, please enter the first part of your postcode to check whether we service your area.


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Our Clients - Our Priority

Everyone’s needs are different so we treat you as an individual and we offer a bespoke professional service prioritising your needs … not ours.

Our Expertise

Your conversion will be undertaken by our dedicated, non-subcontracted teams. Full insurance liability and warranties are provided by SMA.

Fixed Price Quote

We will only work to a fixed price quotation and our aim at the outset, is to capture the entire project specification as far as is possible.

Established since 1996

With over 1700 loft conversions completed throughout London you can be assured that your house is in safe hands.

Our Services

Loft Conversion & Home Extension Services London


Loft Conversions London

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Design & Planning

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VELUX Windows & Blinds

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Loft Conversion Ideas

What type of loft conversion do you want?

Extra Bathroom or Spa Bathroom

You can always use another bathroom in your home and the best way to include an additional bathroom is to convert your loft.

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Home Office or Study

Do you run a home based or part time business that needs more space or more privacy? Then a office/study loft conversion is what you need.

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Teenagers/Children’s Rooms

Converting a loft to a teenagers/children’s room is the perfect way to keep the kids happy & the adult lounge area clean & quiet for the growing family.

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Master Bedroom with En-Suite

Need to create a new master bedroom with more privacy? Then a loft conversion into a Master bedroom with en-suite is what you need.

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Self Contained Studio Flat

Need a separate living area for a relative or flat mate? We can install a single all-in-one bedroom, kitchen, bathroom combination to suit your needs.

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Living/Family Room

When you have guests over or just want to have a living room that is private & sound proof then a living room loft conversion is what you need.

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Recent Projects


SMA Loft Conversions & Extensions have been a London based building company since 1996. We design and build loft conversions and extensions throughout London and the suburbs.

Our goals are to provide a highly professional and quality service tailored to suit your individual needs working to achieve a combination of aesthetically pleasing, practical and cost effective solutions for your project.

As our entire operation is solely focused on loft conversions and extensions you can be sure that here at SMA the entire team are not only highly skilled but are also very experienced in all aspects of loft conversions and extensions on all types of properties from the initial design stage through to Local Authority approval.

We trust you will take the time to browse the site and would hope that you will be assured of the comprehensive and thorough way we approach all projects from the outset.

If you would like any more information or you have any questions please contact us or Free call 0800 068 4606 during normal business hours.

We are accredited and affiliates of Velux, FMB, Trust Mark and Build Assure to give you the customer peace of mind that your project is in safe

We have completed over 1700 Loft conversions and extensions in and around London. See what customer’s have said about us and some of our latest work to the right.

What Client’s Say

The conversion went extremely well. It was done incredibly fast we thought with less disruption than we imagined. The final result is truly superb and lots of people have commented on what a good conversion it is.
Will Hurst, London W7
The process of doing the conversion was as painfree as such a major structural change could be. I was kept fully informed about what to expect at each stage and the team were a pleasure to work with. They were highly professional, stuck to their commitments and went to great trouble to keep thing tidy as they went. The final snagging list was small and all the items were dealt with immediately and professionally. I was delighted with the overall result. All four were also genuinely lovely to deal with, explaining clearly what needed to be decided by when and what all the options and tradeoffs were (a real bonus for a single woman).
Fiona O’Reilly , Twickenham
We are very pleased with the final result. Everyone who worked on site were very helpful and professional. Very happy with all of them.
Paul Dixon , London, W10
The loft conversion was done to a very high standard and I am delighted with the end result.
Jean-Luc Eberlin , London, NW6
We are delighted with the result. The whole process ran very smoothly and efficiently with minimal disruption to our busy household. Craig was excellent and worked unbelievably fast at the start of the build. He was great fun and always cheerful. Andy (Sparky) was also great, and nothing was too much trouble for Sam who project managed everything and always came over at the drop of a hat if something needed sorting.
Mr & Mrs Thackery , London, W12