“Absolutely fantastic service from Loft Box. The team was professional, efficient, and delivered exactly what they promised. Our loft conversion exceeded all expectations and the quality of work is outstanding.”
SarahLondon
Verified customer
See what your loft conversion would cost before anyone calls you. Then a free home survey, a written fixed price, and a build by a team that only does lofts.
Straight answer
Standard loft conversion from
£25,000+ VAT
That's a complete, Building-Regs-signed-off room — not a shell. Bathrooms are priced as an option, so you can see exactly what one adds before you decide.
Price my loftOr call 03330 383 380 · Mon–Fri 9–5
Not included: Building Control fees, planning fees if an application is needed, a party wall surveyor if a shared wall is involved, and decoration or furniture beyond the agreed finish.
Real Loft BOX projects
Which one is yours?
Guide prices for a 3-bed semi, standard finish, no bathroom, + VAT. The calculator narrows it down to the types that suit your roof shape.
Roof lights in the existing slope. The simplest conversion — keeps your roofline and is usually permitted development.
From £25,000 + VAT Price this type Most popularA box extension off the back of the roof. The most head height and floor space for the money, and the one most people choose.
From £28,000 + VAT Price this typeSquares off the sloping end of a hipped roof into a vertical gable wall, then adds roof lights.
From £32,500 + VAT Price this typeSquares off the end and boxes out the back. A big double bedroom with an en-suite is the usual result.
From £35,500 + VAT Price this typeTwo dormers wrapping over the main roof and the rear addition. The largest floor area without touching the roof shape.
From £38,000 + VAT Price this typeSquares off the hipped end, then wraps an L-shaped dormer over the main roof and the rear addition. The biggest loft we build.
From £45,500 + VAT Price this type20+
Years of loft conversions
Lofts only. Nothing else.
10yr
Structural guarantee
Steels, floor, dormer frame.
£25k
Standard conversion from
+ VAT. Fixed in writing.
60s
To price your loft online
Seven taps. No email wall.
How it works
01
Seven questions about your home and what you want. You get a real figure — and what it could add to your home's value — with no email required.
60 seconds02
One of our own surveyors measures up, checks head height and talks through layouts. You get a written fixed price, usually the same day. No pressure to decide.
45 minutes at home03
Drawings, structural calculations and Building Control handled for you. If your home needs planning permission, we guide you through it.
We handle the paperwork04
A specialist loft crew on site, managed day to day. Inspected, signed off by Building Control, and handed over with your 10-year guarantee.
Weeks, not months
Why Loft BOX
A general builder fits a loft between other jobs. We do nothing else — which is how we can put a fixed price on it, finish in weeks and stand behind the structure for ten years.
What homeowners say
“Absolutely fantastic service from Loft Box. The team was professional, efficient, and delivered exactly what they promised. Our loft conversion exceeded all expectations and the quality of work is outstanding.”
“From initial consultation to project completion, Loft Box provided exceptional service. The attention to detail and craftsmanship is remarkable. Highly recommend for anyone considering a loft conversion.”
“Outstanding work and customer service. The team was punctual, clean, and respectful throughout the entire process. Our new loft space has transformed our home completely. Thank you Loft Box.”
“Professional, reliable, and skilled team. The loft conversion was completed on time and within budget. The quality of materials and workmanship is excellent. Would definitely use Loft Box again.”
“Incredible transformation of our loft space! The team at Loft Box made the entire process smooth and stress-free. Excellent communication throughout and the final result is beyond our expectations.”
Good questions
Seven quick questions. A real fixed-price figure. No email needed to see it.