For a block of flats should SBEM be used for the common areas (corridors and reception)?

Each flat is a separate dwelling and must be assessed using SAP (the relevant guidance is in ADL1A). However, the common areas in the flats are not classified as dwellings. As stated in ADL1A paragraph 14, the appropriate approach to compliance depends on whether the common areas are heated or unheated.

If the common areas are heated, the guidance in ADL2 should be applied using SBEM. When defining an envelope element between the common area and a flat, the flat should be classed as a "conditioned adjoining space". If the common areas are unheated, reasonable provision would be to provide fabric elements that meet the fabric standards set out in paragraphs 33 to 36 of ADL1A.

A new activity will be added to the activity database in a future version of iSBEM for these areas. For now, please select Building type 'Hotel' and activity 'Circulation area (corridors and stairways)'. This activity has no DHW demand associated with it.

It is still necessary to assign a DHW generator to these ...

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