Mandatory & Optional Credits
The Code contains several mandatory elements which must be achieved to gain compliance, plus other non-mandatory elements that help achieve the number of credits required.
The Mandatory Credits:
Credits for reduction in DER/TER.
0% = 0 Credits, 8% = 1 Credit, 16% = 2 Credits,
25% = 3 Credits (level 4), 36% = 4 Credits.
Wat1 (Internal Water Use)
Max. 105 litres/person/day, level 3&4 (3 credits)
Max. 80 litres/person/day, level 5&6 (5 credits)
(NB. 90 litres/person/day = 4 credits).
Mat1 (Environmental Impact of Materials)
Based on BRE Green Guide. Materials used must be rated A+ to D
(for at least 3 of the main construction elements (roof, upper &
ground floors, internal & external walls, glazing).
Sur1 (Surface Water Run-off)
Post-development run-off should be no greater than pre-development.
Was1 (Household Waste)
Adequate storage, both internally and externally
for recycling and non-recycling bins/containers.
(100 litres for 1 bed + 70 litres per extra bedroom)
Hea4 (Lifetime Homes - Level 6 only)
Mandatory for CSH level 6 only, 4 credits available where all
principles of Lifetime Homes, applicable to the dwelling being
assessed, have been complied with.