Whether you live in the picturesque Mill Hill Village or the bustling area of Mill Hill Broadway, our professional in-house design team at Rooftop Rooms is incredibly experienced at bringing your dream loft conversion project to life.

Our valuable 20+ years of experience means we have completed a range of loft conversion projects in the Mill Hill and North London area. We are proud to have delivered an impressive number of loft conversions with our expert craftsmanship by enhancing their unused attic spaces into practical and stylish living spaces. Check out our recent loft conversion projects in Mill Hill:

What Loft Conversions Do We Offer at Rooftop Rooms?

At Rooftop Rooms, we specialise in a wide range of loft conversion styles from L-shaped dorm conversions to hip-to-gable conversions to suit the diverse property types found in Mill Hill. Each attic conversion is designed with your specific needs, space, and budget in mind.

L-Shaped Dormer Conversion

 Ideal for mid-terrace homes, this layout links two dormers to form an “L” shape, creating generous space for multiple rooms.

Velux (Rooflight) Loft Conversion

A cost-effective option using rooflight windows within the existing roof structure, great for adding light and functionality with minimal changes.

Hip to Gable Conversion

Common in semi-detached homes, this conversion extends the sloped roof into a vertical gable, unlocking more loft space, often combined with a rear dormer.

Mansard Loft Conversion

A more extensive conversion that changes the roof slope to near-vertical, offering maximum internal space—ideal for full-floor additions.

Rear Dormer Loft Conversion

One of the most popular options, this box-style extension adds height and floor space—perfect for an extra bedroom, office, or en-suite.

Top Floor Flat Conversion

We convert lofts in top-floor flats to add valuable living space, subject to permissions, ideal for leaseholders looking to expand.

Detached Loft Conversions

With fewer structural limits, detached homes allow for spacious, flexible layouts such as luxury suites, home studios, or multiple rooms.

Conservation Area Loft Conversion

Our team has extensive experience navigating strict local planning rules to deliver lofts that preserve historic charm.

Bungalow Loft Conversions

Transforms single-story homes by adding upper-level living space—perfect for bedrooms, offices, or extra family space.

How Much Does a Mill Hill Loft Conversion Cost?

The typical price of a loft conversion in Mill Hill typically starts at £35,000 + VAT; however, the final price can depend on several different factors. At Rooftop Rooms, we offer individually tailored quotes that take into account your unique loft conversion project needs. Whether that’s the type of property, choice of materials, or any custom features or changes you wish to include.

Contact Us Today

Ready to discuss your Mill Hill loft conversion project needs? Get in touch with our experienced and knowledgeable team at Rooftop Rooms and we will be happy to discuss your bespoke project and any questions you may have. You can expect a free initial consultation, followed by a bespoke quote on your Mill Hill loft conversion project.

 
 
 
 
  EXCELLENT  
  
 Based on 106 reviews 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
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 Stuart Empson 
 
25 September 2026
 
 
  
We would highly recommend Rooftop Rooms to anyone looking to do a loft conversion. From beginning to end, they were excellent. They listened, understood and advised on what was important to us throughout. All their workers were friendly, punctual and quick to address any issues. We’re thrilled with both the end result and the process
  
 
 
 
 
 
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 S S 
 
23 June 2026
 
 
  
We used Rooftop Rooms for a dormer loft conversion in our Victorian terrace last year and were very pleased with the overall experience. From the outset, Colin was clear about what was required and offered some excellent design ideas to help maximise the space. Rooftop Rooms also has a transparent pricing structure, which meant we had a clear understanding of costs from the beginning. As with any construction project, there were a few inevitable teething issues along the way, but Gary was always quick to respond and came to site promptly whenever needed to resolve them—even on bank holidays. Any communication challenges we experienced were generally with subcontractors rather than the Rooftop team themselves, who were consistently professional, polite, and helpful. Sally and Hayley in the office were excellent throughout the project, keeping everything organised and ensuring matters were followed up efficiently. Overall, I would happily recommend Rooftop Rooms. Their transparency, responsiveness, and commitment to customer service made the process much smoother. As with any building project, maintaining clear communication and regular site visits is key, and Rooftop supported this well throughout.
  
 
 
 
 
 
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 William Dunbar-Sheppard 
 
6 May 2026
 
 
  
We used Rooftop rooms for our loft conversion (double dormer in an L shape). We are delighted with the amazing space they have created for our family and the loft was finished to a high standard. Throughout the process, staff in the office and on site were friendly, professional and helpful. They employ highly skilled trades and are experts in this area. Thank you Rooftop rooms!
  
 
 
 
 
 
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 Esther Schulze 
 
23 February 2026
 
 
  
Roof Top Rooms has just completed my loft conversion and the work from start to finish was handled with excellence. All snags were finalised, the whole team from the office to the tradesmen worked efficiently with little mess and were a joy to be around. I'm beyond thrilled with my new bedroom and shower room and I highly recommend Roof Top Rooms.  It wasn't as stressful as I thought it would be.  Special thanks to Gary who managed the project with care, Sally and Hayley for their invaluable advice in the office and their weekly schedules.  Dan, Billie and Terry who built the dormer and the rest of the team (electricians, plasterers, carpenter, plumbers, tiler, snag team) who were all fantastic!
  
 
 
 
 
 
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 Patrick Brathwaite 
 
22 January 2026
 
 
  
A fantastic job by Rooftop Rooms on leaving us with beautiful loft room space. Critical was our project manager and the office in keeping momentum in the work and everything on schedule; and completed well. A big thank you!
  
 
 
 
 
 
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 William Myers 
 
24 July 2025
 
 
  
Rooftop Rooms did a fantastic job on our loft conversion. The bulk of the building work was completed within two months which was greatly appreciated in winter. They gave us lots of good advice throughout the process and were flexible and considerate to the changes we asked for - things like window types and sizes, electrical socket placements, bathroom layout etc. The end result was exactly what we wanted and I would definitely recommend them.
  
 
 
 
 
 
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 V Micunovic 
 
3 June 2025
 
 
  
Really professional.  Always came back to us and were willing to pick up the telephone to answer any questions we had.  Overall very happy with the service and would recommend.
  
 
 
 
 
 
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 Peter K 
 
22 May 2025
 
 
  
We used Rooftop Rooms for a loft conversion: a bedroom + bathroom. Have to say that they were excellent from start to finish.

A couple of elements worth highlighting. Firstly, the advice they offered throughout the process from planning through construction was top notch. They made things really clear and transparent gave us great information.

Secondly, the construction itself was great and carried out to a high standard. Mitch and his crew were really good throughout and it went smoothly and surprisingly quickly. All the carpentry, electrics, plumbing etc. was organised well too.

Gary, who was project managing the whole thing, was also really helpful providing us with advice, running through things with us, and getting any snagging done quickly at the end.

Ultimately, they did everything they said they would, on budget, and did it to the timescales they'd set. We're really pleased with the results - couldn't ask for any more! Thank you Rooftop Rooms!
  
 
 
 
 
 
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 Nico Beukes 
 
18 May 2025
 
 
  
We have used Rooftop Rooms now for the 2nd time to do our loft conversion in Hadley Wood.  It was a big, ambitious project that involved removing the whole roof, lifting the gables on each side and creating 3 x huge dormas at the back, and 2 x dormas in the front.   They employ all their own tradesmen, who are the nicest builders we have ever met.   Most of the employees were still with them from the last time we used them 8 years ago to do our loft conversion in Whetstone, which just show that the company is run by nice people.  They are trustworthy and keep their promises.   Gary and Colin, the two owners, just does not let you down and are always there to ensure that we were happy.   They go out of their way to keep everything on track, and communication was outstanding throughout the 9 month project.   Yes, things can go wrong, but they just on it straight away and sort it out - no questions asked and no quibbles.

We cannot recommend them highly enough.
  
 
 
 
 
 
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 Joe Bacon 
 
16 May 2025
 
 
  
Amazing service and quality of work. Would 100% recommend! Thank you!!!
  
 
 
 
 
 
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 KATIE AMOTT 
 
23 April 2025
 
 
  
We’ve been thoroughly impressed with Rooftop Rooms from start to finish. Our loft conversion was managed brilliantly, with timely and effective communication from Hayley and Sally in the office and our PM Gary was always on hand to advise and support with decisions and things that cropped up along the way. We couldn’t believe how quickly the build took shape, with Adam and the team working incredibly long days to get the roof off and back on again with minimal fuss. Everyone worked so hard. Would recommend!
  
 
 
 
 
 
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 Nick Sharp 
 
1 April 2025
 
 
  
Delighted with the work Rooftop Rooms have done for us to convert our loft to a master bedroom with ensuite and walk in wardrobe.

The build was completed by a highly professional team of reliable and skilled tradesmen. There was good communication from Hayley and Sally and Project Manager Gary ensured everything ran smoothly and was there to answer questions where we had them. The 1st fix carpentry team led by Adam and his team worked long hours and the loft took shape very quickly and it was really impressive how quickly the structural work was completed with then no downtime before the next element of the build.

We're very happy with how the build has turned out and would definitely recommend Rooftop Rooms.