London's Premier Loft Conversion Specialists

Transform Your
Unused Space Into Something
Extraordinary

Bespoke, architecturally considered loft conversions across London. Fixed prices. No surprises. Exceptional results — guaranteed.

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15+ Years of
Excellence

Stunning loft conversion interior by Prime Loft

About Prime Loft

London's Most Trusted
Loft Conversion Specialists

Prime Loft is a specialist loft conversion company delivering premium-quality transformations across London. Part of the Prime Construction Group, we combine architectural expertise with precision craftsmanship to create spaces that genuinely add lasting value to your home.

We manage every aspect of your project in-house — from initial survey and design through to building regulations approval and final handover — with a single, transparent fixed price.

Free no-obligation survey & fully itemised quotation

All planning, design & structural engineering included

Fixed price — absolutely no hidden extras, ever

10-year structural warranty on every single project

One dedicated project manager from start to finish

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Our Services

Every Type of Loft Conversion
Expertly Delivered

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Dormer Loft Conversion

A box-shaped extension to your roof creating a full-height room with maximum usable floor space. The most versatile option for most London homes.

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Period Homes

Mansard Loft Conversion

A near-vertical rear wall that maximises headroom and floor space — the signature choice for London period terraces and conservation areas.

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Semi-Detached

Hip to Gable Conversion

Extend the hipped end of your roof outward to create a dramatically larger loft space — ideal for semi-detached and end-of-terrace properties.

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Maximum Space

L-Shaped Dormer

Two dormers forming an L-shape — one of the largest conversions possible, making full use of the roof over both the main house and back addition.

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Best Value

Velux / Roof Light

The most cost-effective entry point — Velux windows installed into the existing roofline, flooding your loft with natural light and creating usable space.

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Extensions

Rear Extensions

Single and double-storey rear extensions built to the same exacting standards by the same trusted Prime Loft team you already know.

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Our Process

How We Deliver
Your Dream Loft

A transparent, fully managed process from your very first enquiry right through to final handover — you're always in the picture, always in control.

Free Survey

We visit your home, assess feasibility, and take precise measurements. No obligation whatsoever.

Fixed Quote

A fully itemised fixed-price quotation covering all works. What you see is what you pay — guaranteed.

Design & Planning

Our architects draw up your plans. We handle all planning submissions and building regulations approval.

Build

Our expert in-house team works efficiently on site, typically completing your conversion in 6–10 weeks.

Handover

We sign off all certifications, issue your 10-year warranty and hand over your stunning new space.

Why Prime Loft

The Prime Difference

We're not the cheapest option in London — we're the best value. Here's exactly why hundreds of homeowners choose Prime Loft.

Fixed Price Guarantee

Your quote is your final price. We never add surprise costs, hidden extras, or mid-project variations. Ever.

10-Year Structural Warranty

Every single Prime Loft conversion is backed by a full decade of structural warranty — giving you complete peace of mind.

Dedicated Project Manager

One expert point of contact from start to finish. Always available, always accountable, always on your side.

All In-House Expertise

Architecture, structural engineering, planning and build — all handled by our own expert teams under one roof.

Client Reviews

What Our Clients Say

★★★★★

From initial survey right through to handover the Prime Loft team were professional, responsive, and delivered exactly what they promised. Our new master bedroom with en-suite has completely transformed our home and added serious value.

Sarah & James T.

Clapham, South London

★★★★★

I was nervous about the whole process but my project manager kept me fully informed every single step of the way. The fixed price meant no nasty surprises and the quality of finish is genuinely outstanding. Cannot recommend highly enough.

Michael R.

Islington, North London

★★★★★

The L-shaped dormer gave us two extra rooms and incredible natural light throughout. Prime Loft handled planning permission without any fuss whatsoever — finished exactly on time and right on budget. Brilliant company.

Priya & Arjun S.

Tooting, South London

Transform Your
Unused Space Into Something
Extraordinary

London's Most Trusted
Loft Conversion Specialists