The Green Guide - BRE

BRE is an independent and impartial, research-based consultancy, testing and training organisation, offering expertise in every aspect of the built environment and associated industries. They help clients create better, safer and more sustainable products, buildings, communities and businesses.

Jewson recognises the importance of an independently verified system of assessing the 'sustainability' of different products and specifications. The most comprehensive system is currently published online by the BRE (Building Research Establishment).

The environmental rankings are based on Life Cycle Assessments (LCA), using BRE's Environmental Profiles Methodology 2008.

Materials and components are arranged on an elemental basis so that designers and specifiers can compare and select from comparable systems or materials as they compile their specification. The elements covered are:

  • External walls
  • Internal walls and partitions
  • Roofs
  • Ground floors
  • Upper floors
  • Windows
  • Insulation
  • Landscaping
  • Floor finishes

Ratings for floor finishes, windows and insulation are assessed in isolation without any other materials within the specification; the rating therefore directly refers to the product.

Across these building element categories the Green Guide provides an extensive, but not exhaustive, catalogue of building specifications covering most common building materials.


Green Guide Ratings

The ratings referred to in this Jewson guide are all A+ and A ratings with information about alternative specifications. Please consult the Green Guide Online for more information.

Access to the Green Guide Online is free, but requires users to register prior to use at

Please note that generic ratings published in the Green Guide are not specific to any one proprietary product and it is important that their use does not convey that impression. A product could be used in a number of different specifications, which could each achieve different ratings.


Embodied Impact on Materials

For the embodied impacts of materials the Code for Sustainable Homes uses the Green Guide as the means to rate materials for credits. The Green Guide is based on life cycle assessments that look at the whole life cycle of materials from extraction (cradle) to end of life (grave), including an option to look at future uses, i.e. recyclability (cradle-to-cradle).

"It's great to see Jewson playing their part in taking sustainable materials forward, guiding their customers through the many new and different types of materials now available." - Victoria Blake, Associate Director for BRE Global.