Extent of the Inspection

To undertake an RdSAP survey, the energy assessor measures and visually inspects the dwelling, recording various factors, such as: room layouts, construction methods, amounts of insulation, glazing, lighting, plus heating and hot water systems and their controls. The assessor will also try to determine the date of construction of the building and any extensions or alterations.

The survey is not destructive and no testing or sampling is undertaken. All heating, hot water and lighting systems will be assumed to be working correctly.

When a factor cannot be accurately determined from inspection, the assessor will make appropriate assumptions and may rely on written documentary evidence, such as receipts and guarantees, but the assessor is not permitted to accept hearsay evidence not backed up with some form of written proof.

Access Difficulties

The energy assessor will try to inspect all parts of the dwelling both internally and externally, but health and safety considerations may restrict the inspection, particularly in areas such as cellars and roof spaces where the size and location of access hatches and the lack of light or headroom may render such areas unsafe.

If an assessor is unable to access all parts of the dwelling, appropriate assumptions are made based on the property’s age, construction and type.