Dormer loft conversions
A box extension built out from the roof slope
Loft conversions
For homes with a sloping, hipped roof, we build the sloping side up into a vertical gable wall, creating the headroom and floor space a proper loft room needs.
A hipped roof slopes on three or four sides, which limits how much of the loft you can use. A hip to gable conversion extends the sloping side, the hip, up into a straight vertical gable end.
That significantly increases headroom and floor space, making the loft practical for a spacious bedroom, an office or even a master suite with an en-suite. Done well, it blends in with your home’s existing architecture.
We manage the whole process, from architectural plans and structural calculations to building control and final finishes.



Replacing the sloping side with a vertical wall creates far more usable floor area and head height.
Many homeowners combine a hip to gable conversion with a rear dormer to maximise the space.
It turns an underused loft into practical everyday living space without the cost and hassle of moving.
The new gable is built to match your home’s look, adding function and value without looking added on.
Why Top Mark
Two decades of designing and building loft conversions across Nottinghamshire and Derbyshire.
We listen to your ideas, suggest improvements and plan the space around the way you live.
Private building control, structural engineer’s calculations and building regulations are all part of the service.
Detailed quotes that include building control fees, and clear communication as the work goes on.
Our process
The same proven sequence on every project, from the first steel going in to the final sign-off, with you involved at the moments that matter.
Work starts on day one with steel fabrication and the new structure, creating a strong framework to safely support your new living space.
With the structure finished, we fit your new staircase so the loft is safe and easy to reach from the floor below.
Once the stairs are in, you come up and see the space for yourself. Planning rooms and windows while standing in the loft is far easier than working from a drawing.
First-fix electrics and plumbing go in, and you can talk through ideas for your bathroom and main room with our electricians and plumbers.
We insulate, plasterboard and build internal walls while our roofers and bricklayers work outside, keeping the time on site to a minimum.
Plasterers, second-fix joiners, electricians and plumbers complete every detail on site, leaving you with a transformed home you’ll love for years to come.
Reviews
From 31 reviews on Google. Here’s what a few of our customers had to say.
5 out of 5 stars
Highly recommend Top Mark Conversions Ltd They listened carefully to our ideas offered valuable suggestions and delivered exactly what we wanted The quality of the craftsmanship was impressive and our new living space has added both comfort and value to our home
5 out of 5 stars
We recently had a loft conversion completed by the team at Top Mark Conversions Ltd and couldn’t be happier with the results. From start to finish, they were incredibly helpful, professional, and clearly very experienced. Nothing was ever too much trouble for them – they were always happy to answer questions, offer advice, and make sure everything was exactly how we wanted it. The quality of workmanship is excellent, and the whole process felt smooth and well managed. I’d highly recommend TopMarkConversions to anyone considering a loft conversion. A great team delivering a fantastic end result!
5 out of 5 stars
Mark and his team were fantastic throughout our project. From the initial meeting with Mark to discuss and price for the job he kept us informed at every step. The whole team were professional and nothing was too much trouble. With the access to various trades at his disposal, any requirements we had were able to be met. Would thoroughly recommend.
5 out of 5 stars
Highly professional work from Mark and his team. All trades,material delivery,waste disposal and any loose ends were taken care of by Mark promptly Great communication, always on the other end of the phone to answer any questions Highly recommended
5 out of 5 stars
Mark and his team was truly amazing! The whole team was friendly , polite and helpful. Nothing was an issue for them. Helped us to design and achieve the most out of our loft. The space they have created is unbelievable. Highly recommend them! Trustful and professional service. They look after every single step of the work. We didn’t have to deal with anything. Hard to find such genuine contractors like them! 👌
5 out of 5 stars
Outstanding craftsmanship from Mark and his team, from day 1 Mark kept us informed and updated on the progress. We are so grateful for following Marks advice and years of experience, because we now have a loft space that suppresses all of our expectations and more. I can't thank you all enough. Highly, highly recommend. Thank you so much
5 out of 5 stars
Top Mark Conversions Ltd transformed our unused loft into a bright spacious and beautifully finished room. From the initial consultation to the final handover the team was professional organised and easy to work with The workmanship was exceptional and the project was completed to a very high standard
5 out of 5 stars
Mark and his team were brilliant from start to finish. They completed the shell loft conversion efficiently while keeping the quality of work to a very high standard. They explained every step clearly, gave helpful advice and recommendations, and dealt with any issues that came up without any hassle. We’ve been left with a fantastic loft conversion and me and my wife couldn’t be happier with the result. Thanks again!
5 out of 5 stars
Mark and his team were incredible. It was unbelievable how quickly our cold dusty loft was transformed into a light and spacious luxury en-suite bedroom. Mark was always available to talk me through each stage of the conversion and help me make decisions when I had no idea what I wanted. I now have a beautiful bedroom and feel like I’m on holiday in my own house. Would highly recommend
5 out of 5 stars
What can I say! Nothing but high praises for Mark and his team! We moved out and handed over the keys and came back to our vision becoming a reality! Mark and his team were 100% professional from pre-contract to completion. Not once did I feel that any question, call, concern or request was unanswered or ignored! An absolutely talented team and brilliant company who I’ve recommended and would continue to recommend over and over again! Thanks again Mark and your team! You really did deliver a Top Mark Conversion!
5 out of 5 stars
Very pleased to have found Mark and the team to do our loft conversion. From the moment of receiving the quote to the end we have always received the best service - the level of professionalism and expertise is second to none - nothing was too much trouble! We have managed to add on two extra bedrooms and a bathroom - just what our family needed - so pleased with the end result. Highly recommend!
5 out of 5 stars
Mark and the team were brilliant! They completed my loft conversion, creating a third bedroom in my terraced house, to an excellent standard. From the start of the project they kept me upto date and nothing was too much trouble. Really lovely guys and I couldn’t recommend them highly enough. Thanks!
FAQs
Can’t see your question? Our team is always happy to talk it through.
Ask us a questionA hip to gable conversion turns the sloping side of a hipped roof into a vertical gable wall. That structural change increases headroom and creates significantly more usable loft space.
They’re most suitable for semi-detached, detached and end-of-terrace homes with hipped roofs. These properties often benefit the most from the extra space.
Replacing the sloped side of the roof with a full vertical wall can significantly increase floor area and head height, giving you a much more practical loft layout.
Yes. Many homeowners combine a hip to gable conversion with a rear dormer to maximise the internal space and create a larger, more open living area.
Yes. They’re especially useful in smaller homes where you need more living space without moving, turning an underused loft into a practical everyday room.
Free quote
Tell us a little about your home and what you have in mind. One of our project managers will get back to you to talk it through and arrange your free quotation.
Top Mark Conversions
Open 7 days, 9am to 5pm
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Call 07925 891 170