Why Choose a Single Storey Extension?

What we offer…

We are Trade Price – specialists in the Warmer Roof system, and now Single Storey Extensions. We have been around for over 20 years and have sold over 10,000 products. As the manufacturer of all our products, we can provide customers with the very best price on the market as you’re dealing direct with us. From our combined 40,000 sq foot Showroom and Factory based in Frome, Somerset, we manufacture the Single Storey Extension Kits and can have them delivered to your door within 3 weeks. Each kit comes with a step-by-step installation guide for you to follow.

  • Finance options available
  • Quick & easy to build
  • 3 week turnaround
  • 10 year guarantee
  • Visit our showroom
  • Building reg approved

Complete Kit One Supplier

Assembly drawings are supplied with all Extension Kits

Durabase System

Durable steel base system with a stylish brick slip border complete with 100mm floor insulation and 22mm chipboard flooring.

160mm Wall structure

A 6×2” structural grade timber wall section, covered with a 15mm OSB outer skin.

Roof System

Choose either a Pitched Roof or Flat Roof System for your extension made from structural grade timber with a 15mm OSB outer skin.

Premium Insulation

125mm multifoil honeycomb insulation pre fitted into all wall and roof sections for maximum thermal efficiency.

External Cladding

Innovative exterior PVC cladding range that features an authentic embossed wood effect finish complete with all finishing trims.

Wall Finish Kit

Waterproof breather membrane, treated timber battens, DPC, starter trims and fixings.

Insulated Plasterboard (PIR)

52.5mm Insulated Plasterboard for a smooth internal finish ready to be skimmed and decorated.

Roof Tiles or EPDM Rubber

Choose from our range of synthetic slate or Shingle tiles. Firestone Rubber provided with all Flat Roofs.

Soffit and Fascia Board

We have a range of soffit and fascia colour options available to complement your cladding choice.

Windows & Doors

We have a range of contemporary UPVC and aluminium Patio, French or Bi-Fold options in a range of colours. Full height, pocket, and corner return windows are also available.

Rainwater Goods

Stylish double Ogee gutter system.


Keylite Roof Windows, Fixed Roof Glazing Panels, Window Blinds, and much more…..

A few reasons why homeowners love Single Storey Extensions…

Quick Installation

Single Storey Extensions are much quicker than traditional methods, reducing the amount machinery of needed, making you huge savings.

Less mess, less waste

Your Extension arrives in kit form to ensure a stress free installation. This means far less excavation work and waste material to dispose of compared to other methods of construction.


All Extensions come with a 10-year guarantee to give you peace of mind and confidence in the product provided.

What is a WarmerBase?

A durable steel system, all delivered in kit form to ensure a smooth installation with no large amounts of concrete or building materials needed, unlike traditional methods. The steel frame is placed on concrete pads and is fully insulated for maximum thermal efficiency. The Durabase System arrives in sections for easy handling, so even the narrowest sites with difficult access are not a problem. You’re also welcome to come visit our stunning 6,000 sq ft showroom in Somerset to see our range of DIY home extensions up close and personal.

Building Control Approved
Your Warmer Base has been tested and certified by an approved building inspector.