Loft conversions
From Velux windows to full mansards, we design and build every type of loft conversion across Nottinghamshire & Derbyshire, guiding you from the first consultation to completion.
Conversion types
Your roof shape, your house and your plans for the space all point to the best option. Here’s how each type changes your roof.
A box extension built out from the roof slope
Built out from the slope of your roof, a dormer adds valuable headroom and floor space so the loft works as a proper room. We handle building regulations, structural engineering and every finishing touch.
A full-width box across the rear roof slope
A flat roof and vertical walls off the rear slope give maximum internal volume and a traditional room shape. Popular on terraced and semi-detached homes, with private building control, structural calculations and approvals all covered.
A steep 72° rear wall with a flat roof above
One of the most transformative options. The rear roof is rebuilt as a near-vertical wall, typically at 72 degrees, with a flat roof on top, creating room for several bedrooms or a large master suite.
The sloping hip rebuilt as a vertical gable wall
Made for semi-detached, end-of-terrace and some detached homes with a sloping “hipped” roof. We build the sloping side up into a vertical gable end, significantly increasing headroom and usable floor space.
Two linked dormers forming an L in plan view
Two dormers joined together, one on the main roof and one over the rear extension, forming an “L” from above. Ideal for Victorian and Edwardian terraces, using every inch of roof space.
A small gabled roof over each dormer window
A dormer with its own gabled roof that mirrors the main roof, keeping the character of period and traditional homes while bringing in extra space and plenty of natural light.
Roof windows set flush into the existing slope
Roof windows fitted flush with the existing roofline fill the loft with daylight without major structural changes. They typically fall under permitted development, so they are quicker and easier to install.
Structure and weatherproofing done, fit-out left to you
We build the weatherproof, structurally sound shell: steelwork, floor, roof alterations, dormer if required, windows, staircase and external roofing. You finish the interior at your own pace and budget.
At a glance
A quick comparison to start with. We’ll confirm what your loft allows when we survey it.
| Conversion | What changes | Typically suits | Planning |
|---|---|---|---|
| Dormer loft conversions | A box extension built out from the roof slope | Terraced, semi-detached and detached homes with a traditional pitched roof | Often possible under permitted development. Conservation areas, listed buildings and larger alterations may need planning permission |
| Rear dormer extensions | A full-width box across the rear roof slope | Terraced and semi-detached houses, especially where there’s little room to extend outwards | Often possible under permitted development. Conservation areas, listed buildings and larger alterations may need planning permission |
| Mansard loft extensions | A steep 72° rear wall with a flat roof above | Terraced, semi-detached and detached homes, and especially popular on period properties | Almost always needs full planning permission |
| Hip to gable conversions | The sloping hip rebuilt as a vertical gable wall | Semi-detached, end-of-terrace and some detached homes with a hipped roof | Often possible under permitted development. Conservation areas, listed buildings and larger alterations may need planning permission |
| L-shaped dormer conversions | Two linked dormers forming an L in plan view | Victorian and Edwardian terraces with a rear extension, and some semi-detached and detached homes | Often possible under permitted development. Conservation areas, listed buildings and larger alterations may need planning permission |
| Pitched dormers | A small gabled roof over each dormer window | Period and traditional homes, whether detached, semi-detached or terraced | Often possible under permitted development. Conservation areas, listed buildings and larger alterations may need planning permission |
| Velux conversions | Roof windows set flush into the existing slope | Lofts that already have enough head height and floor space | Typically permitted development. Building regulations approval is still required |
| Shell loft conversions | Structure and weatherproofing done, fit-out left to you | Homeowners who want to finish the interior themselves, or in stages | Often permitted development. Larger structural changes or homes in conservation areas may need approval |
Design process
Every loft is different, so every design is too. We take the time to understand how you live and what your roof allows.
See how the build worksWe listen to your ideas and goals, and talk through what you want the new space to do.
We assess the space available and your roof structure to confirm what’s possible, then recommend the best options.
Our designers draw up detailed plans, so you can picture the finished room before work begins.
One team manages the build, building control and final sign-off, keeping you informed throughout.
Why convert your loft
Extra floor space and well-designed rooms can increase your home’s market value, whether you plan to sell or stay.
An extra bedroom, a home office, a playroom or a guest suite, without the upheaval of moving or extending outwards.
High-quality insulation, efficient windows and good ventilation keep the room comfortable and help cut heating costs.
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 questionWe design and build dormer loft conversions, rear dormer extensions, mansard loft extensions, hip to gable conversions, L-shaped dormers, pitched dormers, Velux conversions and shell loft conversions. The right choice depends on your home’s structure and what you need from the space.
Not every house is suitable. It depends on the existing roof structure, the head height available and the overall space. We carry out a thorough assessment first, checking the structure, the design options and building regulations, so you know what’s achievable before you commit.
We help you choose based on your property’s structure, your budget and the space you need, so the conversion adds as much function and value to your home as possible.
Often not. Many loft conversions can go ahead under permitted development rights. Homes in conservation areas, listed buildings, and conversions that alter the roofline or exceed certain dimensions may need planning permission. We handle the regulatory side for you, including applications and liaising with the local authority.
Most take between 6 and 12 weeks, depending on the size, complexity and type of conversion. Larger projects such as mansard or hip to gable conversions can take longer because of the extra structural work.
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