0208 123 4567 info@primeloft.co.uk ★★★★★ 5.0 · Trustpilot
Client Portal Free Brochure Enquire Now →
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.

Get Your Free Quote → View Our Work
500+
Conversions Completed
15+
Years Experience
5.0★
Trustpilot Rating
10yr
Structural Warranty
5-Star Trustpilot Rating
Fixed-Price Contracts
10-Year Structural Warranty
Dedicated Project Manager
500+ Homes Transformed
15+ Years of
Excellence
Premium loft conversion interior by Prime Loft London En-suite bathroom loft detail
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
Learn More About Us
What We Build

Every Type of Loft Conversion

View All Types →
Dormer loft conversion London
Most Popular

Dormer Conversion

Full-height rooms, maximum floor space. The most versatile London conversion.

Learn More →
Mansard loft conversion London
Period Homes

Mansard Conversion

Near-vertical walls, flat roof. The signature of London's finest period terraces.

Learn More →
Hip to Gable loft conversion London
Semi-Detached

Hip to Gable Conversion

Squares off the sloping hip end — the natural choice for Edwardian semis.

Learn More →
L-Shaped Dormer loft conversion London
Two Rooms

L-Shaped Dormer

Two bedrooms and a bathroom from one project. The Victorian terrace transformation.

Learn More →
Velux loft conversion London
Best Value

Velux Conversion

Flush roof windows, no roofline change. From £18,000 — maximum value, minimum cost.

Learn More →
All loft conversion types London
View All

All Conversion Types

Mansion blocks, trussed roofs, roof terraces, new builds — we do them all.

Learn More →
Our Work

Recent Transformations

View Full Gallery →
Master Bedroom Suite — Islington
Master Bedroom Suite
Islington, N1
Dormer Bedroom — Clapham
Dormer Bedroom
Clapham, SW4
Velux Study — Chiswick
Velux Study
Chiswick, W4
En-Suite Bathroom — Hackney
En-Suite Bathroom
Hackney, E8
L-Shaped Dormer — Balham
L-Shaped Dormer
Balham, SW12
Home Office — Richmond
Home Office
Richmond, TW9
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.

01

Free Survey

An experienced surveyor visits your home — evenings and weekends available. We assess your roof, measure the space, check planning constraints, and identify the best conversion option for your property.

02

Fixed-Price Quote

Within days you receive a fully itemised fixed-price quotation. No ballpark figures — the exact price you'll pay, including architecture, structural engineering, all planning applications, full build, and 10-year warranty.

03

Design & Approvals

Our architects draw up your plans. We manage all planning and Building Regulations applications on your behalf. Your dedicated project manager is assigned and coordinates every stage.

04

The Build

Our specialist team starts on site. Most loft conversions take 6–10 weeks. Daily site visits from your project manager. You're always kept in the picture.

05

Handover

Full snagging inspection with you before we leave. Building Regulations Completion Certificate and 10-year structural warranty issued on handover day.

Full Process Guide →
Ready to Start?

Book Your Free Survey & Fixed-Price Quote

No obligation. No pressure. A clear, honest picture of what's possible in your home — and exactly what it will cost.

Our Guarantees
Fixed price — not a penny more
10-year structural warranty
In-house architects & engineers
Dedicated project manager
Building Regs & planning managed
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. Guaranteed.

The price we quote is the price you pay — written into your contract. No variation orders mid-build, no extras at handover. This commitment is absolute, not aspirational.

Your Dedicated Project Manager

Every Prime Loft client has a single named project manager from survey to handover. On site daily. Available by phone throughout. You are never left wondering what is happening.

In-House Architecture & Engineering

We do not outsource design or structural engineering. Our in-house architects and engineers produce every drawing and calculation — ensuring design quality and structural integrity from the outset.

10-Year Structural Warranty

Every Prime Loft conversion comes with a fully backed 10-year structural warranty — the same protection as a new build home. Your investment is protected long after we leave site.

On Time, Every Time

We provide a full week-by-week construction programme before work begins. Completion dates are commitments, not estimates — and our track record across 500+ London projects demonstrates this.

5.0 Trustpilot Rating

Hundreds of verified five-star reviews from homeowners across London. The best evidence of quality is what our clients say after the job is done — not what we say before we start.

Where We Work

Loft Conversions Across All of London

All Areas →
North London
Islington · Barnet · Haringey
South London
Clapham · Dulwich · Brixton
East London
Hackney · Walthamstow · Bow
West London
Chiswick · Richmond · Ealing
Central London
Chelsea · Kensington · Notting Hill
Islington
Loft Conversions
Highgate
Loft Conversions
Clapham
Loft Conversions
Brixton
Loft Conversions
Hackney
Loft Conversions
Walthamstow
Loft Conversions
Chiswick
Loft Conversions
Richmond
Loft Conversions
Notting Hill
Loft Conversions
Chelsea
Loft Conversions
Kensington
Loft Conversions
Muswell Hill
Loft Conversions
What Our Clients Say

5.0 Stars on Trustpilot — Every Review Verified

★★★★★

“From survey to handover, the process was completely transparent. The fixed price didn't budge — exactly what we needed. The new bedroom suite has transformed our home.”

Sarah T. — Islington
★★★★★

“We got three quotes. Prime Loft weren't the cheapest but they were the clearest — the project manager was on site every day and we always knew what was happening.”

James & Claire R. — Clapham
★★★★★

“Turned our three-bedroom terrace into five bedrooms. The L-shaped dormer was done in eight weeks. Incredibly professional from start to finish.”

Mohammed A. — Walthamstow
Read All Reviews →
2025 Price Guide

How Much Does a Loft Conversion Cost?

We publish our prices honestly and openly. Here are our current ranges for London — all inclusive of architecture, planning, structural engineering and build.

Velux / Roof Lightfrom £18,000
Dormer Conversionfrom £36,000
L-Shaped Dormerfrom £42,000
Hip to Gablefrom £44,000
Mansard Conversionfrom £52,000
Full Cost Guide →
No Estimates. No Guesswork.

Get Your Exact Fixed Price Today

The only way to get an accurate, fixed price is a free home survey. Our surveyor visits, assesses your property, and provides a fully itemised fixed-price quotation. No obligation.

Book Free Survey → or call 0208 123 4567
Ready to Start?

Get Your Free Survey & Fixed-Price Quote Today

No obligation. No pressure. A clear, honest picture of what's possible in your home — and exactly what it will cost.

Book a Free Survey → ☎ 0208 123 4567
Call Us Get Free Quote