Approved Document L2A (2006 edition)
Conservation of fuel and power in new Buildings other than dwellings
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The new document now establishes a single compliance route based on Target Carbon Dioxide emission rates. The new regulations require the submission of a checklist that demonstrates that compliance has been met against 5 defined criteria.
1. The Building Emission Rate (BER) is not greater than the Target Emissions Rate (TER).
2. The Performance of the building fabric and the heating, hot water and fixed lighting systems should be no worse than design limits.
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3. Those parts of the building that are not provided with comfort cooling systems have appropriate passive control measures to limit solar gains.
4. The performance of the building, as built, is consistent with the BER.
5. The necessary provisions for energy efficient operation of the building are put in place
The Carbon emissions calculation methodology required when generating the BER, TER and the compliance checklist is defined in Simplified Building Energy Model (SBEM). Local authorities are authorised to accept calculations from persons registered with BRE Certification Ltd or other persons deemed by Building Control Bodies as suitably competent. BRE Ltd have produced, on behalf of the ODPM, a freeware software package with a basic interface called iSBEM which is obtainable from the National Calculation Methodology web site.
Commercial software companies such as BuildDesk may provide their own interfaces with SBEM. BuildDesk has taken this opportunity to launch an approved and more user-friendly interface for SBEM called Carbon Checker, read more. There is also an option to develop more complex detailed simulation model calculation tools (DSMs). The current list of Government approved software for Part L2A of the Building Regulations is available at the National Calculation Methodology web site.
If you are not looking for an Approved software tool, BuildDesk is also able to offer a SBEM calculation and consultancy service using our own in-house Competent Persons, read more.
BR443 Conventions for U-value Calculations (2006 edition)
One of the second tier documents referred to in the new Part L document, is the new BR 443 Conventions for U-value calculations (2006 Edition).
For information on the 2006 edition of the BR 443 Conventions for U-value Calculations, click here.
For information on our updated BuildDesk U 3.2 software, click here.
For Building Regulations (England & Wales) applying prior to 6th April 2006, click here.
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