Velux (roof-light) loft conversions in North London
A Velux loft conversion adds roof windows and a fully fitted loft room without changing the shape of your roof. It is the most cost-effective option where your loft already has enough headroom, it rarely needs planning permission, and it is usually the quickest type of conversion to build. Kev Construct gives you a fixed price in writing.
Recent Velux loft conversions
A finished loft room without changing your roof
A Velux, or roof-light, conversion turns your existing loft into a finished room by fitting roof windows into the current roof slope and fully fitting out the space inside, with a floor, insulation, a staircase, electrics, plastering and decoration. Because the roof structure stays as it is, there is no dormer or gable to build, which keeps both the cost and the disruption down.
The name comes from Velux, the best-known brand of roof window, and the result is a bright, comfortable room filled with natural light from above. It is a favourite for home offices, guest bedrooms, playrooms and hobby spaces.
When does a Velux conversion work best?
A Velux conversion is the right choice when your loft already has enough headroom to stand and move around comfortably under the existing roof. If the ridge is high and the pitch is steep, you may not need a dormer at all, and a roof-light conversion will give you a lovely room for the lowest cost.
It is also ideal when you want to keep the outside of the house exactly as it is, or where planning constraints make bigger changes difficult. On the free home visit we measure your headroom and tell you honestly whether a Velux conversion will give you the room you want, or whether a dormer would serve you better.
How much does a Velux loft conversion cost?
As a guide, a Velux loft conversion in North London starts from around £30,000 in 2026, making it the most cost-effective type of conversion where the headroom already allows. That is a guide starting figure rather than a fixed quote, and we confirm your exact price in writing after a free home visit. See the full breakdown on our loft conversion cost guide.
Does a Velux conversion need planning permission?
Usually not. Because a roof-light conversion keeps the existing roof shape and only adds windows within the slope, it very often falls under permitted development and does not need a full planning application. Conservation areas and some flats can be exceptions. As with every conversion, we check the rules for your property, confirm where you stand, and handle any application if one is needed. All our work meets building regulations and is certified on completion.
A simple, predictable process.
You always know what happens next, who's on site, and exactly what it costs.
Free home visit
We come to you, measure your headroom and talk through what you want the space to do.
Fixed quotation
Marian prepares a clear, itemised quote in writing with no hidden fees.
Design & regs
We prepare the drawings and handle any building-regs approval for you.
The build
John, Dan and Niko fit the windows and finish the room, keeping the site tidy.
Completion
We hand over your finished room with its certification and workmanship guarantee.
What our customers say.
“John and the whole crew were a pleasure to work with. Fast, great communication, finished on time and to a high quality.”
“Dan and Niko put real care into the work; Marian set everything out clearly with no hidden fees. They went above and beyond.”
“We're an architecture practice and have worked with Kev Construct for years. Reliable, trustworthy, excellent finishes.”
Good to know.
How much headroom do I need for a Velux conversion?
As a rough guide you want enough height under the ridge to stand comfortably and move around, which usually means a decent roof pitch. If the headroom is borderline, a dormer may give a far more usable room. We measure it precisely on the free home visit and give you honest advice before you commit to anything.
Is a Velux conversion cheaper than a dormer?
Yes. Because it keeps the existing roof shape and adds no structural extension, a Velux conversion is the most cost-effective type, starting from around £30,000 as a guide. The trade-off is that it only works where you already have the headroom, whereas a dormer creates headroom and floor space at a higher cost.
How long does a Velux loft conversion take?
A Velux conversion is usually the quickest type to build, often completed in a little under the typical 6-8 week window because there is no dormer or gable to construct. We give you a clear schedule with your fixed quote and keep the site tidy and on track throughout.
Can I add an ensuite to a Velux conversion?
Yes, provided there is room within the existing loft to fit one comfortably. We handle the plumbing, waterproofing and ventilation to building-regulations standard, and price the ensuite as a clear option in your quote. On the home visit we will confirm whether the space works for a bathroom as well as a bedroom.
Ready to add the space
your family needs?
Tell us about your loft and we'll arrange a free home visit. You'll get a clear, fixed price in writing - with no pressure and no hidden fees.
- Free home visit & survey
- Fixed price in writing - no surprises
- Local Edgware team · rated 9.67/10 on Checkatrade
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