Warm Roofs

Warm Roofs are the perfect way to transform your conservatory or home extension into a comfortable, year‑round living space. With excellent energy efficiency, and a build quality you can trust, a Warm Roof adds both everyday comfort and long‑term value to your home.

A Versatile Roofing Solution for Conservatories, Garden Rooms and Extensions

A Prefix Warm Roof is a solid, insulated roofing system designed to replace a traditional glass or polycarbonate roof on a conservatory, or to be incorporated into a garden room or extension. The result is a space that feels like a true part of your home – not a room that’s only usable a few months of the year.

By significantly reducing heat loss in winter and limiting excessive heat in summer, a warm roof helps maintain a more stable, comfortable temperature all year round.

This improved thermal performance can also support lower energy usage, reduce condensation and outside noise, and create a quieter, more relaxing environment for everyday family life.

Whether you’re upgrading an existing conservatory or planning a new garden room project, a Prefix Warm Roof offers a practical, long‑term solution that combines comfort, efficiency, and a clean, modern finish.

Ideal Budget for a Warm roof: £7,000 – £18,000

A TRUE Warm Roof System

The Prefix Warm Roof system includes a 70mm insulated top panel made from advanced phenolic material, designed to reduce heat loss across the entire roof structure.

By insulating over the roof bars, it helps eliminate thermal bridging, keeping warmth inside during colder months and preventing overheating in summer.

This construction creates a genuine Warm Roof system, delivering excellent energy efficiency with a U‑value of 0.15, fully compliant with current UK building regulations.

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Benefits of a Warm Roof

More comfortable year‑round, keeping the space warmer in winter and cooler in summer
Improves energy efficiency by reducing heat loss
Reduces glare, noise and condensation compared to traditional glazed roofs
Creates a more usable living space that feels like part of the home
Meets UK building regulations for thermal performance
Smart, modern finish inside and out

A warm roof is not just an upgrade – it’s a practical investment in comfort, usability and energy efficiency.

What’s Included in the Investment & Typical Price Guide

A warm roof is a substantial upgrade that transforms how the space performs and feels throughout the year.

The overall cost of a warm roof reflects the quality of materials, the level of insulation, and the work involved, and typically includes:

A fully insulated roofing system designed for year‑round use
Removal of existing roof and professional installation
Roof includes Fascia, Soffits, and Guttering
An internal plastered ceiling, ready for decorating
An external tile or slate finish
Full compliance with UK building regulations
A solution built for long‑term comfort and energy efficiency

Every home is different, but the guide below provides a realistic indication of what most customers invest in a Prefix Warm Roof.

Ideal Budget:

Small to Medium Warm Roof: £7,000 – £12,000

Medium to Large Warm Roof: £12,000 – £18,000

All prices are indicative and subject to a full site survey and final specification. We’re always happy to discuss different options to suit a range of budgets and project requirements.

Extra Costs: Wall Plastering, Electrics, Window Boards, Windows and Doors.

How a Prefix Warm Roof Is Installed

To help you understand how a Prefix Warm Roof system is constructed, this video shows the typical installation process.

Seeing the process step‑by‑step can help clarify what’s involved and what you’re investing in, especially when planning a conservatory upgrade, garden room, or extension.

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Please note: this video is provided by Prefix for illustration purposes only. The installation shown was not carried out by our team and is intended to demonstrate the typical build process of a Prefix Warm Roof system.

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