How Much Does a Loft Conversion Cost?

How Much Does a Loft Conversion Cost?
How Much Does a Loft Conversion Cost?

If you want to gain extra space in your home, add value to the property or find yourself longing for a room with a view, a loft conversion can be an excellent solution, particularly in areas where extensions can be more restricted.

Build up into the loft and fall back in love with your home! Converting your loft into practical rooms and utilising your space is a unique way to breathe new life into your home — and is more cost-effective than selling up and moving out…

July 2022 marked 12 successive monthly price increases as the housing market continued to defy expectations, with the average price of a house in London sitting at £526,183. House prices surged during the Covid pandemic in the ‘race for space’, which saw homeowners looking for bigger properties as working from home became the new normal.

In 2022, the average cost of moving house is also £3,838 — including valuation fees, solicitor fees and general moving expenses. And that is before you add on stamp duty (the holiday period is long gone)! Meaning renovating your existing property could be the smarter move.

How much will a conversion cost?

On average, a typical UK loft conversion will cost around £40,000. However, this price tag can vary considerably depending on the size and complexity of the project.

Some of the most important factors that will affect the your loft conversion cost are:

  • The size of your loft.
  • The property’s existing roof structure.
  • The type of loft conversion.
  • The style and quality of the finishings.
  • How long the project takes.
  • Where you live.

As a general rule, the bigger the loft conversion and the higher quality of the finishes, the bigger your budget will need to be.

Which conversion is right for you?

The most common type is the rear dormer loft conversion — an extension to the existing roof with vertical walls, which add floor space and allow for windows. This is suitable for most homes with a sloping roof and typically costs between £30,000 and £50,000. If space and style are your goals, a rear dormer conversion is perfect for your property.

Or, opt for a hip-to-gable conversion, where one of the sides of the roof is replaced with a vertical end wall. Hip-to-gable conversions are a fantastic way to add headspace to bungalows, semi-detached and detached homes and typically cost between £40,000 and £55,000.

A Mansard roof conversion significantly alters a house’s appearance, with sloping walls and a flat roof. Many people like that Mansards are aesthetically similar to regular roofs and create the feeling of an additional storey rather than a modified loft. These more significant projects can cost between £50,000 and £60,000.

Considerations for your project

As the world opened up again, there was a rush of people who wanted to get work done on their homes — in the UK and overseas. This meant demand has rocketed for imported supplies — from timber, steel, aluminium and roofing products to plastics and polymers, paints and resins.

Due to the ongoing supply chain crisis, loft conversions, which normally take between eight and 10 weeks to install, now take between 12 and 16 weeks. Waiting lists are longer than ever, with many smaller firms fully booked until next summer.

Though there is a clear need to plan and book ahead, these wait times are nothing compared to the time and effort moving house can take. Moving into a new home takes months — not to mention any added complications if you are part of a property chain.

Getting your loft conversion underway

The adventure of a new loft conversion is always exciting. Still, before your project can begin, you will need to observe a few procedures to ensure your project complies with guidance from your local planning authority.

It is advisable to get comprehensive plans drawn up for your conversion, either from an architect or an architectural technician. This will lay out precisely what changes will happen and how the finished project will look, considering all the relevant structural changes that need to be made, including all the necessary calculations.

If your property has permitted development rights, you can usually build a loft conversion under a Certificate of Lawfulness. Otherwise, you will need to obtain planning permission and cannot start work until approval has been granted. Once your application is validated with the council, your conversion can be underway in a matter of weeks.

Experienced surveyors will also need to assess your property to determine its suitability for a loft conversion and the building and planning regulations it must conform to throughout the process. Additionally, if you own a terraced or semi-detached property, you must inform your neighbours and secure consent for the work ahead, as per the Party Wall Act 1996. 

The Loft Room is a specialist loft conversion company covering Southwest London, Berkshire, Surrey, Hampshire and Middlesex. To find out more about our loft conversion process and get a quote, contact us on 0800 002 9291 or email info@the-loftroom.com.

Get in touch for a free no obligation quote


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Sam Kemp profile picture
Sam Kemp
21 October 2026
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Dragos and his team did a great job for us. They provided a complete end to end service from design, architecture and planning permission, full loft construction and decorating. Early on in the project, with the support of Dragos, we decided to make a fundamental change to the design. They took this in their stride with no material change to the cost. The team were considerate, skilled, polite and reliable throughout the project. I would thoroughly recommend The Loft Room to anyone considering a loft extension or major alteration.
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Iain Russell profile picture
Iain Russell
19 October 2026
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From the moment we spoke to Maggie, we felt The Loft Room was the right company for us. The whole admin team (Maggie, Melissa, Helen and Ciara) are warm and friendly, and super efficient. Dave and Ashley (and Charlie) have done a fantastic job converting our loft. We have wholeheartedly trusted Dave’s expertise with him having completed 42 lofts previously. We are absolutely delighted with the results so far. The tradespeople that have been over have been excellent: Mark and Kasper - the roofers, Stuart - electrician, Justin - plasterer, Dave - painter etc. We did get some lower quotes from other companies, but we think there’s a strong case of ‘you get what you pay for’ with The Loft Room. The whole process was surprisingly smooth and unobtrusive - we just hadn’t expected that from a loft conversion. We would definitely recommend The Loft Company.
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Richard Jones profile picture
Richard Jones
19 October 2026
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Really happy with the finished loft conversion! The team was very friendly, professional, and respectful of our home throughout the project. While it took a little longer than initially expected, we put it down to the extreme heat of the summer we just had. The quality of the final build makes it well worth it—would recommend!
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Henry profile picture
Henry
6 October 2026
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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 profile picture
Ruth Gibbons O'Brien
2 October 2026
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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
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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
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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
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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
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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.