Warm Roof Conversion
Eliminate condensation and slash heating bills — upgrade to a modern warm roof system.
- Eliminates condensation and damp problems
- Meets current Building Regulations for insulation
- Fixed pricing — no hidden costs
Cold Flat Roofs Cause Condensation
Most older flat roofs are "cold roof" constructions — the insulation sits between or below the joists, leaving the deck and covering exposed to temperature extremes. In winter, warm moist air from the room below meets the cold underside of the deck and condenses. Over time, this causes timber rot, mould growth, stained ceilings and damaged insulation — even when the roof covering itself is perfectly watertight.
A warm roof conversion solves this by placing rigid insulation boards above the deck, keeping the entire roof structure warm and dry. Radiant Roofing carries out warm roof conversions across Kent, Sussex and Surrey, combining the insulation upgrade with a new flat roof covering to give you a fully compliant, energy-efficient roof in one project.
How It Works
Roof Assessment
We inspect your existing flat roof, check the timber structure and calculate the insulation depth needed to meet Building Regulations.
Fixed Quote
You receive a detailed quote covering strip-out, insulation, new covering and all finishing details — no hidden extras.
Warm Roof Build-Up
We strip the old covering, install rigid insulation above the deck, add new OSB board and lay your chosen flat roof system on top.
Guarantee
Your warm roof conversion is backed by our workmanship guarantee plus manufacturer warranties on insulation and covering materials.
Roof Assessment
We inspect your existing flat roof, check the timber structure and calculate the insulation depth needed to meet Building Regulations.
Fixed Quote
You receive a detailed quote covering strip-out, insulation, new covering and all finishing details — no hidden extras.
Warm Roof Build-Up
We strip the old covering, install rigid insulation above the deck, add new OSB board and lay your chosen flat roof system on top.
Guarantee
Your warm roof conversion is backed by our workmanship guarantee plus manufacturer warranties on insulation and covering materials.
What Our Warm Roof Conversion Includes
We convert cold flat roofs to fully insulated warm roof systems in a single project. The work meets current Building Regulations and can be combined with any flat roof covering system.
What Does a Warm Roof Conversion Cost?
Typical price range
£2500 – £8000
VAT may apply depending on the project
Factors that affect the price:
- 1Roof area and required insulation depth
- 2Condition of existing deck and timber structure
- 3Covering system chosen (EPDM, GRP or felt)
- 4Whether tapered insulation is needed for drainage
A warm roof conversion costs more than a simple re-cover, but it eliminates condensation problems, meets current insulation standards and can significantly reduce your heating bills. We provide a fixed quote after survey.
What Our Customers Say
Verified Google ReviewsJane S.
Kent
They were very friendly, professional and polite and left the site immaculate at the end of the day. I would thoroughly recommend them to others. The work was carried out to a very high standard.
Peter B.
East Sussex
Excellent work, highly recommended! Very knowledgeable, by far the best roofing company we have ever used and super nice guys.
Sarah M.
Surrey
Radiant Roofing completed our roof repair quickly and professionally. Great communication throughout and a fantastic result.
Frequently Asked Questions
A warm roof conversion typically costs between £2,500 and £8,000 for a standard domestic flat roof. The price depends on roof size, the insulation depth required and the covering system chosen. While it costs more than a simple re-cover, the energy savings and elimination of condensation problems make it excellent value over the life of the roof.
In a cold roof, the insulation sits below or between the joists, leaving the deck and covering cold. Warm moist air from the room condenses on the cold deck, causing damp and rot. In a warm roof, the insulation sits above the deck, keeping the entire structure warm and eliminating condensation risk. Warm roofs are now the recommended approach for all flat roof constructions.
Yes, slightly. The rigid insulation boards and new covering add between 100mm and 150mm to the overall roof height. In most cases this is not noticeable and does not cause any issues. We check upstand heights, door thresholds and neighbouring boundaries during the survey to ensure everything works.
We cover Kent, East Sussex, West Sussex and Surrey. Our teams regularly carry out warm roof conversions in Tunbridge Wells, Crowborough, Sevenoaks, Tonbridge, Uckfield, Haywards Heath, East Grinstead and surrounding areas.
If the work involves replacing more than 25% of the roof covering, Building Regulations require the insulation to meet current thermal performance standards. A warm roof conversion is the most straightforward way to achieve this. We can handle the Building Control application and arrange sign-off as part of the project.
Contact Us!
Get in touch with us!
Looking for a free quote? Just fill in the form below, and we'll take care of the rest!
Contact Information:
Mobile (24/7): 07753 165 005
Landline (Office Hours): 01892 356 967
Email: contact@radiantroofing.co.uk
Head Office:
Address:
Alpha House
Crowborough Hill
Crowborough
TN6 2EG
Opening Hours:
Monday to Friday: 7:30 am – 6:00 pm
Saturday: 7:30 am – 12:00 pm
Sunday: Closed (mobile still available)
Our Mobile and Email is available 24/7
