How much does a loft conversion increase the value of my property

On average a loft conversion can increase your property value by around 10% – 20%. That said, this percentage can differ depending on numerous factors, including the loft type, property size, location, features of the conversion and more.

How much does a loft conversion increase the value of your property?

Q: What return on investment (ROI) could a loft conversion offer?

If your property has permitted development rights, you can build a pitched dormer conversion under a Certificate of Lawfulness. This certificate means that, as long as you build within the council’s guidelines, you do not need to wait for the application to be approved before work commences. If you do not have permitted development rights, you will need to obtain planning permission. With planning permission, you cannot start work until it has been granted. Once a planning application is validated with the council, it should issue a decision after eight weeks.

How much does a loft conversion increase the value of your property?

When thinking about extending your property, one of the first things you’re likely to consider is how much it could increase the price of your property by.

As there are so many options available for converting your loft space, there isn’t one simple answer to the question of how much a loft conversion will increase the value of your house, although it’s been known that a loft conversion can add on average around 10% – 20% more to the value of your property.

That said, the percentage could go up or down depending on numerous factors. Some of the key things to consider before going ahead with your project include:

What type of loft conversion you’re adding to your property
The location of your property and its surroundings
What you will be using your loft conversion for
Features of the loft conversion
The cost of the loft conversion vs the increase in value it could offer

What type of loft conversion are you adding to your property?

The type of loft conversion you’re planning will play a huge factor in what value could be added to your home. Not all properties are suitable for all types of loft conversions so it’s always worth speaking to a loft conversion expert to understand what options are available to you before thinking too far ahead.

Where is your property located and what are the surroundings like?

The geographical location will dictate the value increase a loft conversion could offer, as will the properties surroundings and local amenities. Good transport links, highly rated local schools, and a pleasant neighbourhood with a low crime rate are all things considered by most home seekers, so if your property is already based in a sought-after location, you’re likely to see a larger increase in your property’s value after converting your loft than if you’re based in a less desired location.

What will you be using the loft conversion for?

Another factor in what percentage increase you could expect a loft conversion to have on your property is what you’re going to use the loft conversion for. Typically, a converted loft that provides an extra bedroom with an ensuite will add the most value to your home. Home offices are now one of the most in-demand property features since the rise in home working following the Covid-19 pandemic and converting your loft into office space can also offer a significant rise in the value of your property.

What features does your loft conversion have?

Features of the loft conversion will also dictate the extra value you may be able to add to your property. The design and layout of the conversion as well as the additional space created, the décor, available storage in your loft conversion and how you create natural lighting are all things that will play a part.

What return on investment (ROI) could a loft conversion offer?

The cost of your loft conversion and the ROI it could offer will depend largely on the points previously mentioned. Once you’ve considered the points above, it’s advised you speak to a loft conversion specialist to see whether your house is eligible for a loft conversion, and if so, what options are available to you. Once this has been established, a quote can be provided so you know how much the project will cost initially. With this in mind and taking the previous points in to consideration, you should have a good idea on what your return on investment would look like if you were to sell your property. The property market is ever-changing, so its worth noting that the value it could add to your property could go up or down over time.

Looking to add value to your property in 2023? Get in touch for a free, no obligation chat to discuss what options are available to you.

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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!

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.

jasmine zohdy

17 August 2026

We used the loft room for our loft extension and are very pleased with the results. We were lucky enough to have Adrian and Andre build the dormer, the whole experience was excellent from start to finish. The work was completed incredibly quickly, yet the quality remained consistently high throughout. Adrian brought great ideas to the project that genuinely improved the final design, and he kept everything neat and tidy every single day. All the trades they works with — electrician, roofer, plumber and more — were equally reliable and skilled. There were no delays at any stage; each team arrived exactly when needed and kept the project moving smoothly. The administration side Helen and Mellisa was also superb, with clear updates and communication about progress and next steps. A very professional service all round.

Amy Dobson

6 August 2026

Off the recommendation of friends we engaged the Loftroom to refresh and extend our existing loft conversion, adding new insulation, skylights, a new shower room and additional bedroom. We have never done major work to a property before so benefited greatly from loft room supporting us start to finish with planning, designs and all the various trades needed. Our team lead Marius was excellent from start to finish. Him and his team were incredibly hard working, working quickly and to a very high standard. We were really impressed especially given they worked through multiple heat waves !!Their advise and guidance during the build was invaluable (see skylight in shower room!). We wouldn’t hesitate to recommend Marius and the wider loft room team (who were very supportive every step of the way) to anyone looking to complete a loft conversion or improve an existing one.

Andrea Guerra

4 August 2026

We recently completed a loft conversion with The Loft Room, adding two generous rooms, a bathroom and a proper landing, and we are delighted with the result. The new floor feels like a natural part of the house rather than an addition, and the quality of the finished space is excellent. A special mention must go to Dave, who managed the project with patience, kindness and a genuine commitment to getting things right. Building work inevitably brings challenges and changes along the way, but Dave was consistently approachable, practical and willing to find solutions. He took real pride in the work and cared about the final outcome, which made a significant difference to us. The whole team worked incredibly hard in our home, and we are very grateful for what they created. It was a major project for our family, and the additional space has genuinely transformed how we can use and enjoy the house. We would happily recommend The Loft Room and especially Dave.

Brooke Owusu-Bempah

27 July 2026

Getting a loft conversion done is a big decision. We were honestly quite nervous about it, especially given the investment involved and the number of horror stories you hear about building projects going wrong. Thankfully, our experience with The Loft Room was the complete opposite. From day one, the whole process was handled brilliantly. Everyone we dealt with, from the office team through to the various tradespeople who worked on our home, was professional, friendly and incredibly well organised. What impressed us most was that our loft was completed in just 9 weeks, and the quality of the workmanship never felt rushed. A special mention has to go to Ashley C. He wasn't just the team leader overseeing the project. He was the lead carpenter and the driving force behind the entire build, coordinating all of the contractors, managing the day-to-day work, and making sure everything stayed on track. More than that, he felt like a genuine partner in the project. He understood that we had a budget to work within, took the time to listen, offered great ideas to maximise the space, and always made us feel completely comfortable and informed. His communication was exceptional throughout. No question was ever too small, no concern was ever brushed aside, and he was always happy to walk us through things, sometimes more than once when we needed reassurance. Having someone like Ashley on site every day made what could have been a stressful experience feel surprisingly straightforward and enjoyable. Every contractor who came into our home was polite, respectful and highly skilled. There wasn't a single issue throughout the build, and it was obvious that everyone took pride in their work. In fact, by the end of the project, it was genuinely a little sad to see the team finish. Ashley had become such a reassuring and professional daily presence that we'll genuinely miss seeing him and the crew around. We're now at the final decorating stage and can't wait to move into and enjoy our beautiful new space. We've been talking about our experience to anyone who'll listen, recommending The Loft Room to neighbours and friends, and proudly showing people the transformation. If you're considering a loft conversion, we honestly couldn't recommend The Loft Room highly enough. They've completely exceeded our expectations in every way. 10/10 for quality, professionalism, communication and customer service. And if you're lucky enough to have Ashley C. leading your build, you'll be in extremely safe hands. He played a huge part in making our project such a success.

Harry G

20 July 2026

We had our loft conversion completed by The Loftroom Teddington at the start of the year, and we're absolutely delighted with the finished result. The extra space has made such a difference to our home, and the quality of the work has been excellent. A big thank you to Ash, who did a fantastic job and was always friendly, hardworking, and happy to answer any questions we had each morning (and throughout the day!). We'd also like to thank Paul, who was great from our very first interaction, as well as Melissa and Helen in the office, who kept everything running smoothly, and Rich, who regularly popped in during the build to check on progress. As with any building project, there were a few small niggles, but these were dealt with quickly, professionally, and efficiently. It was reassuring to know that the team stood by their work and were committed to making sure everything was right. Overall, we've had a really positive experience from start to finish and wouldn't hesitate to recommend The Loftroom Teddington to anyone considering a loft conversion. Thank you to the whole team!

nick davis

17 July 2026

Marius and his team were punctual, quick and clean and did a good job on our loft extention. Would recommend them.

A Z

15 July 2026

Many thanks to Paul, Melissa, Helen, Maggie and our project manager Mihai! The whole team is great, and the tradespeople they used are highly professional and do excellent work. Thank you for delivering my project right on schedule and with fantastic results.

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