Part L 2013 in a nutshell

At a launch at the BRE in Watford yesterday, further details on Part L (which will come into effect in England on 6 April 2014) were released.  So what does this mean?

  • A 6% uplift to CO2 targets across the build mix for domestic
  • A 9% uplift on aggregate for non-domestic with no mandatory target
  • There will be a new mandatory Target Fabric Energy Efficiency rate (TFEE) – TFEE assesses passive measures, i.e. insulation and air tightness
  • The fuel factor retained at current levels
  • The Approved Documents and appendices will be available week commencing 21st October
  • There will be minor changes only for existing buildings (for clarification only)
  • Beta versions of SAP and SBEM will be available from 5 November.  These will be non-compliant versions for use and testing by interested groups – constructive feedback requested
  • There is a new website for innovative technologies or products

However, transitional arrangements are covered under the Building Act which means that construction sites which start on one property before April 2014 could still be built to 2010 standards right into 2015

Values for recipe compliant solutions were noted as:

External walls 0.18 W/m2.K
Floors 0.13 W/m2.K
Roofs 0.13 W/m2.K
Air tightness 5m³/m²/hr @ 50 Pa
Doors/windows 1.4 W/m2.K

Elemental backstops remain unchanged from 2010 Regs.