London's premium loft conversion specialists since 2009. 500+ completed projects. In-house architecture, engineering and construction — all under one fixed-price contract.
Prime Loft was founded in 2009 by a team of architects, structural engineers and master builders with a shared conviction: that London loft conversions deserved better. Better design. Better construction. Better transparency. And better value — not just in price, but in what you actually receive.
The loft conversion industry in London had a structural problem. Homeowners navigated a fragmented process — separate architect, separate structural engineer, separate builder — with accountability gaps that widened whenever something went wrong, and prices that grew between quote and completion.
We built Prime Loft on a different model. Architecture, structural engineering, planning and construction all in-house, all coordinated by one named project manager, all delivered to one fixed price. Fifteen years and 500+ completed projects later, that model has earned us a 5.0-star Trustpilot rating and a reputation as the premium specialist in our market.
Six principles that have guided Prime Loft since 2009 and that are embedded in how every member of our team approaches every project.
We have never in our history issued a variation order to a client. The price we quote is the price in your contract. We carry every risk of unforeseen conditions, material changes and programme delays.
If a conversion isn't feasible, or the cost doesn't justify the value gain, we tell you. We'd rather lose a quote than waste your time or your money.
We don't design from templates. Every conversion is designed specifically for your property, your brief and your planning constraints by our own in-house architectural team.
Your named project manager coordinates architecture, engineering, planning and construction — and is your direct contact from survey to handover. Single point of accountability, always.
Your 10-year structural warranty is backed by independent insurance — not just our promise. It's transferable to future buyers of your home.
127 independent reviews. Every client invited. None filtered. The rating is earned across 500+ completed projects and is the most honest measure of what we do.
Unlike most construction companies, Prime Loft employs its core team directly — not as a loose collection of subcontractors. Our architects, structural engineers, planning specialists and project managers work together as an integrated unit on every project.
Our in-house ARB-registered architects design every conversion from scratch. No templates. Every drawing is created for your specific property, brief and planning context.
Our structural engineers calculate every steel beam, every connection and every foundation load — in-house, from day one of design, not as an afterthought at the last minute.
Our planning team has secured approvals in every London borough, including conservation areas, listed buildings and Article 4 Directions. We manage all applications as part of your fixed price.
Every project has a named project manager who is directly contactable throughout — evenings and weekends included. They coordinate all trades and provide weekly written updates.
Our construction teams are directly employed or long-term partners who have worked on hundreds of Prime Loft projects. Consistent people, consistent standards, every time.
We remain your point of contact for 12 months after handover. Your 10-year warranty is backed by an independent insurer — it doesn't depend on us remaining in business.
We complete loft conversions across every part of London — from Victorian terraces in Islington and Hackney to period semis in Richmond and Chiswick, from conservation-area mansards in Chelsea and Kensington to family homes in Balham, Walthamstow and beyond.
| London Area | Key Towns Covered | Most Popular Conversion | Typical Cost From | View Area |
|---|---|---|---|---|
| North London | Islington • Highgate • Muswell Hill • Finchley • Barnet • Crouch End • Wood Green • Hornsey • Tottenham • East Finchley | L-Shaped Dormer | £42,000 | Explore → |
| South London | Clapham • Balham • Brixton • Dulwich • Battersea • Streatham • Tooting • Wandsworth • Vauxhall • Herne Hill | L-Shaped Dormer | £42,000 | Explore → |
| East London | Hackney • Walthamstow • Dalston • Stoke Newington • Bow • Stratford • Wanstead • Leyton • Forest Gate • Clapton | L-Shaped Dormer | £42,000 | Explore → |
| West London | Chiswick • Ealing • Fulham • Richmond • Putney • Twickenham • Kew • Hammersmith • Brentford • Hounslow | Hip to Gable | £44,000 | Explore → |
| Central London | Notting Hill • Kensington • Chelsea • Knightsbridge • Marylebone • Belgravia • Mayfair • Pimlico • Maida Vale • Fitzrovia | Mansard | £90,000 | Explore → |
Yes. We are an integrated design-and-build company. Our architects design your conversion, our structural engineers calculate it, our planning team gets it approved, and our construction team builds it — all under one contract and one fixed price.
Yes — Prime Loft is part of the Prime Construction Group, a family of specialist London residential construction brands. We operate independently with our own dedicated team and focus exclusively on loft conversions and associated works.
Prime Loft was founded in 2009. We have now completed over 500 loft conversions across London and have consistently maintained a 5.0-star rating on Trustpilot.
Yes. We carry £5m public liability insurance, £10m employers liability and £2m professional indemnity. We are members of the FMB, CHAS accredited and TrustMark registered. All accreditation certificates are available on request.
Loft conversions are our primary and core specialism. Through the Prime Construction Group, we also deliver rear extensions, basement conversions and kitchen extensions — but every loft project is treated as our main business, not an afterthought.
Three things: our fixed-price guarantee (we have never issued a variation order), our in-house integrated team (architecture, engineering and building under one roof), and our 10-year structural warranty backed by independent insurance. Most companies offer none of these three. We offer all three on every project.
Book a free survey and meet your dedicated project manager in your own home.
Book Free Survey or call 0208 123 4567Come and see the Prime Loft difference from your very first visit.