Building regulations - the approved documents
The full set of English and Welsh Building Regulations define how each part of a building needs to be constructed or altered - there is no need to upgrade an existing building to the current standards.
However, some aspects may come into play if the use of the building is changed i.e. from a family house to a house of multi-occupancy - generally such changes will need other local authority approval anyway.
The Scottish government have Technical Handbooks which provide guidance on achieving the standards set out in the Building (Scotland) Regulations 2004 - these are available in two volumes, Domestic buildings and Non-domestic buildings.
Building Regulations are completely different from Planning Permission, you need Building Regulations approval even where Planning Permission is not required.
The Local Authority will have a Building Control Office; this office will need to confirm that any new work is done in accordance with the Building Regulations, you will need to pay a fee for their approval and site inspections, but if you do the work without authority/approval, it is a criminal offence and you may have problems selling the property without the appropriate certificate.
The National House Building Council (NHBC) can be employed instead of the Local Authority to inspect/approve the work and provide a 10 year guarantee on the work they approve; however, this isn't a realistic option for the diy'er.
Approved Documents
The most recent versions of the Approved Documents of the Building Regulations are listed below and are available from the Planning Portal for either purchase or download. It will be noted that some of the documents have not been updated for sometime while others have more recent editions - it pays to keep an eye open for updates but any applicable change will be highlighted by the local Building Control Office.
Part A
Approved Document A - Structure
Part B
Approved Document B (Fire
safety)
Part C
Approved Document C - Site
preparation and resistance to contaminates and moisture
Part D
Approved Document D - Toxic
substances
Part E
Approved Document E - Resistance
to the passage of sound
Part F
Approved Document F - Ventilation
Part G
Approved document G - Hygiene
Part H
Approved document H - Drainage
and waste disposal
Part J
Approved document J - Combustion
appliances and fuel storage systems
Part K
Approved document K - Protection
from falling collision and impact
Part L
Approved Document L: Conservation
of fuel and power (New dwellings)
Part M
Approved document M - Access
to and Use of Buildings
Part N
Approved document N - Glazing
Part P
Approved document P - Electrical
safety - Dwellings
Part Q
Approved document Q - Security - Dwellings
Regulation 7
Approved Document for Regulation
7