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St Austell Bay Windows and St Austell Bay Plastics

Replacement Roofs & Warm Roofs in St Austell & All of Cornwall

01726 816906
Design Your Conservatory

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    Transform Your Conservatory with a Warm Roof Replacement

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    If your conservatory is too hot in summer, too cold in winter and barely used as a result — a SupaLite tiled warm roof replacement could completely transform it. By replacing your existing polycarbonate or glass roof with a fully insulated solid tiled roof, we can turn a cold, unusable space into a comfortable, year-round room that feels like a natural extension of your home. St Austell Bay Windows and St Austell Bay Plastics installs warm roof replacement systems across St Austell and all of Cornwall — including Truro, Bodmin, Falmouth, Fowey, Lostwithiel, Newquay, Padstow, Liskeard and St Mawes. Every installation is carried out by our own in-house team, with no sub-contractors, no call centres and no hard sell. Just honest advice and quality workmanship backed by our up to 10-year insurance-backed guarantee. In most cases your existing conservatory frame can support a warm roof without needing to replace the entire structure — making a warm roof one of the most cost-effective ways to extend the usable living space in your home. Our team will assess your conservatory during a free home survey and advise you on the best solution for your property.

    The SupaLite tiled warm roof system is the UK's most popular conservatory roof replacement. Using a lightweight steel and aluminium frame with a fully insulated roof deck and real roof tiles to match your home, SupaLite transforms your conservatory into a thermally efficient, comfortable room usable all year round. Available in a wide range of tile colours and profiles to suit any property across St Austell and all of Cornwall.
    Unlike a glass or polycarbonate roof, the SupaLite system incorporates high-performance insulation within the roof build-up, achieving U-values that meet or exceed current building regulation requirements. This eliminates the extreme temperature swings associated with traditional conservatory roofs — keeping your room warm in winter and cool in summer without additional heating or air conditioning.
    The SupaLite frame is significantly lighter than a traditional tiled roof — typically around a third of the weight — meaning in most cases your existing conservatory walls and frame can support the new warm roof without any structural modifications. Our team will confirm this during your free home survey.
    A SupaLite warm roof installation includes a choice of internal ceiling finishes — a smooth plastered finish, a vaulted ceiling following the roofline, or an optional Velux skylight or roof lantern to retain natural light while keeping the full thermal benefits of the warm roof. Our team will guide you through the options during your free survey.

    Frequently Asked Questions

    A SupaLite warm roof replaces your existing conservatory roof — whether polycarbonate or glass — with a lightweight, fully insulated tiled roof system. The SupaLite frame is made from aluminium and steel and sits directly onto your existing conservatory walls. High-performance insulation is built into the roof deck, and real roof tiles are fixed on top to match your home. The result is a fully insulated, weatherproof room that can be used comfortably all year round.
    In most cases, replacing an existing conservatory roof with a warm roof falls under permitted development and does not require full planning permission. However, building regulations approval is typically required to confirm thermal performance compliance. If your property is listed or in a conservation area, additional restrictions may apply. Our team will advise you fully on the permissions required during your free home survey.
    In the majority of cases, yes. The SupaLite system is specifically designed to be lightweight — typically around a third of the weight of a traditional tiled roof — so most standard uPVC and aluminium conservatory frames can support it without structural modifications. Our team will assess your existing conservatory during the free survey and confirm whether any additional work is required before installation begins.
    Warm roof replacement prices vary depending on the size of your conservatory, the tile specification, internal ceiling finish and any additional glazing options such as Velux windows or roof lanterns. As a guide, a typical warm roof replacement starts from around £6,000 fully installed. Contact us for a free no-obligation survey and accurate quote tailored to your property across St Austell and all of Cornwall.
    Finance Available

    Finance Your Conservatory

    New conservatories and warm roof replacements — make your dream extension affordable with flexible finance options.

    • New builds & warm roof upgrades
    • Fully insulated, built to last
    • Free home survey & quote
    • Family-run Cornwall installers
    Apply for Conservatory Finance
    Finance available on conservatories
    Why Choose Us

    Why St Austell Homeowners Choose Us

    Year-Round Comfort
    Unlike glass or polycarbonate roofs, a SupaLite warm roof eliminates the extreme temperature swings of a conservatory — keeping it warm in winter and cool in summer, so it finally gets used all year round.
    Lightweight — No Structural Changes Needed
    The SupaLite frame is significantly lighter than a traditional tiled roof, meaning in most cases your existing conservatory walls can support it without any structural work.
    Matches Your Home's Roof Tiles
    Available in a wide range of tile colours and profiles to complement your property — from traditional Cornish stone cottages to modern new-build homes.
    up to 10-year guarantee & Full Compliance
    Every warm roof replacement is backed by our up to 10-year insurance-backed guarantee, with all work fully compliant with current building regulations.

    Our Process

    Step 1 - Free Home Survey
    Step 2 - Your Personal Quote
    Step 3 - Final Survey
    Step 4 - Products Are Manufactured
    Step 5 - Professional Installation
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    Areas We Cover

    Covering St Austell & All Surrounding Towns

    Truro
    Bodmin
    Lostwithiel
    Newquay
    Padstow
    Liskeard
    Falmouth
    St Mawes
    Fowey