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Part L1 divides into five separate criteria to be met, noting that some of the criteria are interdependent with each other:
Criterion 1 – Achieving the TER
Criterion 2 – Limits on Design Flexibility
Criterion 3 – Limiting the Effects of Solar Gains in summer
Criterion 4 – Quality of Construction and Commissioning
Criterion 5 – Providing Information (for the building operator)
Criterion one requires the proposed dwelling to be modelled and simulated
using an accredited software tool to evaluate the carbon emission from
a “notional dwelling”, of the same geometry and function as
the actual dwelling. An improvement factor is then applied to establish
a target emission rate (TER) against which the actual design Dwelling Emission
Rate (DER) must equal or better. To fulfil the requirements of this
assessment, HRS utilise Elmhurst software. Assessments are carried
out by consultants who are registered as “competent persons”.
SAP
- Required Information Check Sheet (PDF Download)

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