There are various guidance documents available for design engineers to refer to during the detailed design within the building environment.

BUILDING RESEARCH ESTABLISHMENT (BRE)
BREEAM Industrial 2006
BREEAM 2006 for Offices
ECO Homes Achieving Excellent Rating
Carbon Dioxide Emissions from non-domestic Buildings: 2000 and beyond
BRE Environmental Policy
BRE Sustainability Report 2006/2007

CIBSE:
CIBSE Guide F: Energy Efficiency on Buildings.
CIBSE TM22: Energy Assessment and Reporting Methodology.
Building Energy Codes - Energy demands and targets for heated, ventilated or air conditioned buildings.
CIBSE TM23: Testing Buildings for Air Leakage.
CIBSE TM25: Understanding Building Integrated Photovoltaics.

CARBON TRUST ENERGY BENCHMARKING TOOLS:
Offices, Sports and Recreation Buildings, Hotels and Government Civil Estate
Industrial Buildings

BUILDING REGULATIONS:

The Energy Performance of Buildings Directive 2002/91/EC
Manual to the Building Regulations
A Guide to Exempt Buildings
Approved Document F
Approved Document G
Approved Document L1A
Approved Document L1B
Approved Document L2A
Approved Document L2B

Web Sites
1. www.cibse.org
2. www.carbontrust.co.uk
3. www.defra.gov.uk
4. www.sustainable-development.gov.uk
5. www.communities.gov.uk