We turn unused roof space into bright bedrooms, home offices and master suites, with one experienced team managing every stage from steelwork to sign-off.
20+years converting lofts across Nottinghamshire & Derbyshire
About us
Local loft specialists who see every project through
Every home is different, so every conversion we build starts with yours: how you live, what your roof allows and what you want the new space to do.
From the first design consultation to the finishing touches, our team guides you through the whole process with clear communication and a programme that stays on track. Based in Ilkeston, we use quality materials and skilled trades to create rooms that add real value and comfort to homes across Nottinghamshire & Derbyshire.
One experienced team, managing every stage from steelwork to sign-off.
Our promise to you
Members of the Federation of Master Builders & the Guild of Master Craftsmen
20+
Years’ experience
Hands-on experience behind every conversion.
5.0
Star rating on Google
Rated 5.0 out of 5 by homeowners.
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Conversion types
From Velux and dormers to mansards.
23+
Towns & villages
Covered across Notts & Derbyshire.
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Key services
The right conversion for your roof
Your roof shape, house type and plans for the space all point to the best option. We handle building regulations, structural engineering and every finishing touch.
ExistingRemovedNew build
Most popular
Dormer loft conversions
Built out from the slope of your roof, a dormer adds valuable headroom and floor space so the loft works as a proper room.
Terraced & semis
Rear dormer extensions
A full-width box across the rear slope, with a flat roof and vertical walls for maximum internal volume.
Most transformative
Mansard loft extensions
The rear roof rebuilt as a near-vertical 72° wall with a flat roof above – room for several bedrooms or a master suite.
Hipped roofs
Hip to gable conversions
The sloping side of a hipped roof built up into a vertical gable wall, significantly increasing headroom and floor space.
Victorian & Edwardian
L-shaped dormer conversions
Two linked dormers – one on the main roof, one over the rear extension – forming an “L” that uses every inch of space.
Period character
Pitched dormers
A dormer with its own gabled roof that mirrors the main roof, keeping the character of traditional homes.
Quickest option
Velux conversions
Roof windows set flush with the existing roofline. Usually permitted development, so quicker and simpler to install.
Finish at your pace
Shell loft conversions
We build the weatherproof, structural shell – steel, floor, roof, windows, stairs – and you finish the interior to your budget.
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Your new space
Bedrooms, en-suites, offices & master suites
We design the space around your needs while making sure it complies with building regulations – and we look after every trade, so you don’t have to.
Master bedroomEn-suiteNew staircase
Everything handled, start to finish
One team · one point of contact
Design consultation & layout
Building regulations & approvals
Structural engineering & calculations
Steel fabrication & new structure
Staircase fitting
Dormers, windows & external roofing
First & second fix electrics
Plumbing, bathrooms & en-suites
High-performance insulation
Plasterboard, plastering & stud walls
Materials, deliveries & waste removal
Completion & sign-off
6–12 wksTypical build timeDepending on size and type, with a detailed timeline from day one.
Often notPlanning permission?Many lofts go ahead under permitted development – we’ll check for you.
£0Free quotationGet in touch by phone, WhatsApp or online to arrange yours.
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Our process
From steelwork to sign-off in 6 stages
A clear, proven sequence, with you involved at the moments that matter most.
01
Steel fabrication & structure
Work starts on day one with steel fabrication and the new structure – a strong framework to safely support your new space.
Typically about 2 weeks
02
Stair fitting
With the structure finished, we fit your new staircase so the loft is safe and easy to reach from the floor below.
03
Last-minute design
You come up and see the space for yourself. Planning rooms and windows while standing in the loft is far easier than from a drawing.
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Plumbing & electrics
First-fix electrics and plumbing go in, and you can talk through bathroom and room ideas with our electricians and plumbers.
05
Insulation & boarding
We insulate, plasterboard and build internal walls while our roofers and bricklayers work outside, keeping time on site to a minimum.
06
Completion & sign-off
Plasterers, second-fix joiners, electricians and plumbers complete every detail, leaving a transformed home you’ll love.
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One team sees the whole job through. All trades, material deliveries, waste disposal and loose ends are coordinated for you – with regular updates at every step.
Proven know-how behind every conversion we design and build, on every type of roof.
One team, steelwork to sign-off
Our own skilled trades cover every stage – no chasing contractors, no gaps in responsibility.
Regulations & structure covered
Building regulations, structural calculations and approvals are handled for you.
Design it standing in the space
Our “last-minute design” stage lets you plan rooms and windows in the real loft, not just on paper.
Clear, honest communication
A programme that stays on track, with Mark always at the end of the phone to answer questions.
Free quotes, open 7 days
Talk to us 9am to 5pm, seven days a week, by phone, WhatsApp or email.
Buying a home?
See the potential before you buy
We carry full professional liability insurance, so we can arrange preview visits with estate agents for homes that aren’t sold yet. Walk through a property before completion and get expert insight into how you could extend, remodel or convert it.
Fully insured site visits
Arranged with the estate agent
Honest advice on what the space could become
5.031 Google reviews
Quality materials, skilled trades and full professional liability insurance.
Not sure which conversion suits your home?Ask us – we’ll talk it through and arrange your free quote.
Click any photo to enlarge · more on topmarkconversions.co.uk/gallery
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Reviews
Rated 5.0 out of 5 by homeowners
5.0
from 31 reviews on Google
“
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! … You really did deliver a Top Mark Conversion!
C
Charlene G.Google review, August 2025
It was unbelievable how quickly our cold dusty loft was transformed into a light and spacious luxury en-suite bedroom. … I now have a beautiful bedroom and feel like I’m on holiday in my own house.
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Alison P.Google review, May 2026
From start to finish, they were incredibly helpful, professional, and clearly very experienced. … The quality of workmanship is excellent, and the whole process felt smooth and well managed.
D
Daniel H.Google review, June 2026
We have managed to add on two extra bedrooms and a bathroom – just what our family needed. The level of professionalism and expertise is second to none – nothing was too much trouble!
L
Lynne D.Google review, April 2025
Helped us to design and achieve the most out of our loft. The space they have created is unbelievable. … They look after every single step of the work. We didn’t have to deal with anything.
A
Alexandra G.Google review, July 2025
“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.”
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WilliamGoogle review, July 2026
“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.”
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Calvin E.Google review, May 2026
“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.”
M
Michael D.Google review, May 2026
“They completed my loft conversion, creating a third bedroom in my terraced house, to an excellent standard. Really lovely guys and I couldn’t recommend them highly enough.”
C
Claire O.Google review, September 2024
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Coverage
Based in Ilkeston, converting lofts across Nottinghamshire & Derbyshire
From Nottingham’s busy suburbs to Derbyshire’s villages, we adapt every conversion to the local architecture and to the way you want to live.
Our base, IlkestonOur working area
NottinghamshireNottingham, its suburbs and the surrounding towns and villages.
DerbyshireDerby and the Derbyshire towns and villages around it.
Local knowledgeConversions adapted to local homes – terraces, semis, period and modern.
Not sure if we cover your area?Give us a call – we’re happy to check and talk through your loft.
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.
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