How much does a loft conversion cost in North London?
In North London, a loft conversion typically costs between £30,000 and £80,000 in 2026, depending on the type. A Velux conversion starts lowest, a dormer sits mid-range, and a mansard costs the most. The final price depends on size, ensuite, staircase and finish. Kev Construct gives a fixed price after a free home visit.
A look at recent loft conversions
Loft conversion cost by type (guide prices, North London, 2026)
The figures below are honest guide ranges for North London in 2026, not fixed quotes. Every roof, budget and finish is different, so we confirm your exact price in writing after a free home visit. As a rough rule, the more the roof has to change, the more the conversion costs.
Guide ranges for North London, 2026 - not fixed quotes. We quote every project individually and put the final figure in writing before any work begins.
What affects the cost of a loft conversion?
The biggest factors are your roof type and how much it needs to change, and the amount of floor space you are creating. Beyond that, the price moves with a handful of clear things: whether you add an ensuite, where the new staircase goes and how much of the landing it affects, the number of dormers or rooflights, and how much structural steel is needed to open the space up safely.
The level of finish matters too. A simple, well-made bedroom costs less than a room with fitted wardrobes, underfloor heating and a high-specification bathroom. Finally, planning permission (for a mansard, a front dormer or a conservation area) and any party-wall agreements with neighbours can add to both the timeline and the total. We flag all of this at the quoting stage so there are no surprises later.
What is included in our fixed price?
Our fixed price is designed to cover the whole job, not just the building work, so the number you agree is the number you pay. It includes architectural drawings and structural calculations, planning and building-regulations sign-off where needed, all structural and building work, your new staircase, insulation, electrics, plumbing, plastering, decoration and the final certification.
Marian sets everything out clearly in writing with no hidden fees, which is exactly what our Checkatrade reviews mention time and again. If you want an ensuite or a particular finish, we price it as a clear option so you can decide what is right for your budget. Every conversion is backed by our workmanship guarantee and the £1,000 Checkatrade Guarantee.
Is a loft conversion cheaper than moving?
Almost always, yes. It is easy to compare a conversion only against the asking price of a bigger house, but the real cost of moving in North London is much higher once you add it all up: stamp duty, estate-agent fees, solicitors, surveys, removals and often a chunk of work on the new place too. Those costs can run well into tens of thousands before you have gained a single extra room.
A loft conversion puts that money into your own home instead. You get the extra bedroom or office you were moving for, you keep your street, your neighbours and your school catchment, and you avoid the stress and uncertainty of a chain. For most families we work with, converting the loft is the calmer and more affordable way to get the space they need.
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 does a dormer loft conversion cost?
In North London a dormer loft conversion typically costs around £45,000-£65,000 as a guide, depending on the size, whether you include an ensuite and the level of finish. It is our most popular type because it adds real headroom and usable floor space. We confirm your exact price in a fixed written quote after a free home visit.
Does the cost include the staircase and ensuite?
Your new staircase is included in the fixed price, as it is an essential part of any conversion. An ensuite is priced as a clear option so you can decide whether you want one, and if so, at what level of finish. Either way, the full figure is set out in writing before we start, with no hidden costs.
Can I get a fixed price rather than an estimate?
Yes. After a free home visit, Marian prepares a fixed quotation in writing with no hidden fees, so you know the full cost before committing. This is one of the things our customers value most, and it is why fixed pricing and clear quotes come up so often in our Checkatrade reviews.
Why do loft conversion prices vary so much?
Because no two roofs or families are the same. A Velux conversion where the headroom already exists needs far less work than a mansard that rebuilds the whole rear roof. Size, ensuites, steelwork, finish and any planning requirements all move the price, which is why a proper quote beats a one-size-fits-all figure.
Do you charge for a quote or home visit?
No. Estimates and home visits are free. We would rather come and see your loft, understand what you want and give you an honest, fixed price than have you guess from a number online.
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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