What an Auditor Checks, Room by Room

An auditor moves through a home room by room because each room has a different fabric, heating, ventilation and use profile, and a whole-home average would hide the rooms that cause problems. Living rooms reveal heating and comfort, bedrooms reveal overnight temperature and ventilation, kitchens and bathrooms reveal moisture and extract ventilation, and halls, lofts and basements reveal fabric, air leakage and system routes that other rooms hide.

The auditor records, in each room, external walls and glazing, heating emitters and controls, ventilation features, signs of damp, condensation or mould, and any fixed lighting or appliances relevant to energy. That structured record lets the report link a problem, such as a cold bedroom, to a cause, such as an uninsulated wall or a missing radiator valve, rather than to a general statement about the house.

In living rooms, the auditor checks the main heating emitter, its size relative to the room and its controls, glazing type and draughts, and cold surfaces such as external walls or bay windows. A living room that cannot hold temperature despite a large radiator may point to fabric loss, air leakage or a control problem, and the auditor will test which explanation fits by checking the fabric and system together.

In bedrooms, attention shifts to overnight conditions: heating schedules, radiator valves, window ventilation, and condensation on windows or walls in the morning. A bedroom kept cool overnight for sleeping comfort is normal, but a bedroom that is damp, mouldy or impossible to warm for evening use signals a fabric or ventilation issue. The auditor distinguishes preference from problem by asking how the room is used and what temperatures occupants expect.

In kitchens, check extract ventilation: does the cooker hood or fan vent outside, does it work, and is it used during cooking. In bathrooms, check extract fans, window ventilation, and signs of condensation or mould on walls and ceilings. Kitchens and bathrooms generate most household moisture, so their ventilation determines whether moisture is removed or spreads to colder rooms.

In halls, lofts and basements, check fabric and routes: loft insulation depth and coverage, hatch insulation and draught-proofing, pipe and cable penetrations, and basement or underfloor ventilation. Those spaces are rarely lived in but often leak the most air and hide the most fabric defects, so an auditor spends disproportionate time there relative to their floor area.

In the UK, room-by-room audit practice follows retrofit and assessment standards that emphasise fabric, ventilation and moisture together, with particular attention to traditional construction in older homes. An auditor in a Victorian terrace will check solid walls, chimney breasts and suspended floors differently from an auditor in a modern flat with communal heating and mechanical ventilation.

In EU member states, room-by-room practice varies with national audit methods, some of which emphasise thermal calculation room by room for heating sizing, while others emphasise overall building performance. A householder abroad should ask what room-level data the national audit produces, especially if heating replacement is planned, because room heat loss figures are essential for correct sizing.

One room-by-room mistake is focusing only on the worst room. A cold bedroom may be caused by a loft defect above it, a heating imbalance across the system, or a draught from the hall below, and fixing the bedroom alone without checking those routes can waste money. Auditors check rooms in sequence precisely to trace causes across rooms, and householders should follow that logic when acting on a report.

Another mistake is ignoring rooms little used. A spare bedroom kept cold and closed, a utility room with no heating, or a conservatory heated in winter can each affect moisture, heating load and comfort in adjacent rooms. An audit should include every room, including unused ones, because energy and moisture move between rooms regardless of how they are used.

Keep the auditor's room-by-room notes, with photographs where provided, alongside your own problem list. Compare the two: rooms where auditor findings and your experience agree are priorities with strong evidence, while rooms where they differ deserve a follow-up question, such as a different season or a specific test.

Ask the auditor, room by room, what the main finding is, what causes it, and what measure would address it without creating a moisture or ventilation problem elsewhere. That room-by-room questioning turns a general report into a specific plan, and it helps you judge whether recommendations fit the rooms you actually live in.