Approved Document ADL1B covers the extension, renovation, change of use, change of energy status and work on controlled fittings and services.
ADL1B gives three routes to compliance:
- Reference Method i.e. use of tables
- Area Weighted average U value method
- Whole dwelling calculation method (using SAP)
In addition, there are a number of rules and requirements which makes ADL1B a complex document, for example: the area of glazing you may have in an extension is limited, the 15 year payback rule for technically difficult element upgrades, etc.
Hibec Ltd are specialists in helping you through the most cost effective route to ADL1B compliance.