Below are links to the most recent versions of the Approved Documents for the fourteen technical "Parts" of the Building Regulautions' requirements. Parts B, K and M are typically the only parts relevant to mezzanine floor construction.

Part A
Approved Document A - Structure (2004 edition)

Part B
Approved Document B - Fire safety (2000 edition consolidated with 2000 and 2002 amendments)

Part C
Approved Document C - Site preparation and resistance to contaminates and moisture (2004 edition)

Part D
Approved Document D - Toxic substances (1992 edition)

Part E
Approved Document E - Resistance to the passage of sound (2003 edition)

Part F
Approved Document F - Ventilation (2006 edition)

Part G
Approved document G - Hygiene (1992 edition)

Part H
Approved document H - drainage and waste disposal (2002 edition)

Part J
Approved document J - Heat producing appliances (1992 edition) 

Part K
Approved document K - Protection from falling collision and impact (1998 edition)

Part L - Buildings other than dwellings
Approved Document L2A: Conservation of fuel and power (New buildings other than dwellings) (2006 edition)

Approved Document L2B: Conservation of fuel and power (Existing buildings other than dwellings) (2006 edition) 
 
Part M
Approved document M - Access to and Use of Buildings (2004 edition)

Part N
Approved document N - Glazing (1998 edition)

Part P
Approved document P - Electrical safety (2006 edition)

All approved document content is  © Crown copyright 2006