Our accreditation and software providers have provided us with an update regarding Part L 2021, we have included the details below for you-

This statement has been supplied by both BRE and Government:

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In preparation for the implementation of Part L 2021 for England later this month, BRE are managing rigorous approval processes which requires all software providers to calculate and match results for a number of standard test cases test cases provided by BRE. The test cases have seen some delays and corrections, and therefore to ensure SAP software is ready for 15th June the approval process has now been changed.

BRE has now provided three batches of test cases prioritised to cover the majority of technologies expected to be used in new homes. The technologies the three batches cover include:

Batch 1: 

• Building fabric (walls, roofs, floors, windows etc.)
• Boilers (mains gas, LPG, electric, oil)
• FGHRS
• Secondary room heaters
• Instantaneous WWHRS
• Solar heating (hot water only)
• Natural ventilation with intermittent extract fans
• Centralised MEV
• Decentralised MEV
• Balanced ventilation with heat recovery (MVHR)
• PV (without battery or diverter)
• Air conditioning

Batch 2:

• Electric heat pumps
• Electric immersion
• PV with battery
• PV with diverter
• Wind turbine

Batch 3:

• Community heating (not from PCDB)
• Balanced ventilation without heat recovery

Validation for the remaining technologies (below) will follow

• Storage WWHRS
• Solar heating (space and water heating)
• Community heating from PCDB
• Positive input ventilation
• Anything else not mentioned above

BEIS and DLUHC have authorised SAP software products for limited release to users when at least batch one is approved by BRE. Where SAP software is not yet approved for a batch, the technologies within that batch should not be used for completing SAP assessments or compliance calculations under SAP 10.2.

When Design SAP 10 is ready for release we will confirm which batches we are approved for and Government envisage that full capability, for all software providers, will be available no later than 31st July 2022.