Skip to content
Data Provider: Welsh Government National Statistics Percentage of dwellings which are free from hazards

Percentage of dwellings which are free from Category 1 Housing Health and Safety Rating Systems (HHSRS) hazards

Breakdown 1
Click here to sortPercentage of dwellingsClick here to sortLower Confidence Interval (%)Click here to sortUpper Confidence Interval (%)
[Collapse]All tenures828184
All tenuresOwner-occupied817883
Private rented767281
Social Housing939195
[Collapse]All ages828184
All agespre 1919666270
1919 to 1944797385
1945 to 1964868290
1965 to 1980868389
Post 1980959397
[Collapse]All types828184
All typesEnd terrace807585
Mid terrace777381
Semi detached868389



Energy performance and the presence of hazards in dwellings

Last update

February 2019 February 2019

Next update


Publishing organisation

Welsh Government

Source 1

Welsh Housing Conditions Survey 2017-18

Contact email


National Statistics

Lowest level of geographical disaggregation


Geographical coverage


Languages covered

English and Welsh

Data licensing

You may use and re-use this data free of charge in any format or medium, under the terms of the Open Government License - see


Housing. Conditions. Survey. Wellbeing. Efficiency. SAP. HHSRS.

General description

The Welsh Housing Conditions Survey (WHCS) collects information about the condition and energy efficiency of all types of housing in Wales. These are the first set of housing conditions results for Wales since the last survey in 2008.
Key data gathered in the WHCS includes information about energy efficiency, cost of repair, the Welsh Housing Quality Standard (WHQS), fuel poverty and the Housing Health and Safety Rating System (HHSRS). For full details of the topics included in the survey please see the survey form, available on the WHCS website.
Data from the WHCS underpin two of the 46 National Well-being Indicators for Wales, specifically homes free from hazards (Indicator 31) and homes with adequate energy efficiency (Indicator 33).
For further information, please see Weblinks.

Data collection and calculation

WHCS fieldwork ran from August 2017 to April 2018. Property inspections were carried out by qualified surveyors, who performed visual assessments of the interior and exterior of properties. For full details of the topics included in the survey please see the survey form, available on the WHCS website.
A sample of addresses was drawn from eligible households taking part in the National Survey for Wales 2017-18. A total of 2,549 full WHCS surveys were achieved across the 22 local authorities in Wales, which enables national level estimates.
Like any figures based on a survey, these results are subject to margins of error. The margins of error (“confidence intervals”) are shown for each result. These give a range within which the true value is likely to fall.

The results of the WHCS are weighted to compensate for unequal selection probabilities and differential non-response (e.g. to ensure that the tenure distribution of the final dataset matches that of the Welsh population).

Energy efficiency of dwellings:
The Standard Assessment Procedure (SAP) is the methodology used by the Government to assess and compare the energy and environmental performance of dwellings.
SAP works by assessing how much energy a dwelling will consume, when delivering a defined level of comfort and service provision. The assessment is based on standardised assumptions for occupancy and behaviour. This enables a like-for-like comparison of dwelling performance. The ratings are expressed on a scale between 1 and 100, where 100 represents no energy cost.
The ‘SAP 2012’ methodology was used in the Welsh Housing Conditions Survey 2017-18. (see the Glossary on the WHCS webpage.)
Housing Health and Safety Rating System:
The Housing Health and Safety Rating System (HHSRS) is a risk-based evaluation tool to help local authorities identify and protect against potential risks, and hazards, to health and safety from any deficiencies identified in dwellings. It is used to determine whether residential premises are safe to live in, or whether a hazard exists that may cause harm to the health and safety of a potential occupant.
The System assesses 29 types of housing hazard and provides a rating for each one. Those which score high on the scale (and are therefore the greatest risk) are called category 1 hazards – if, after a local authority inspection, a dwelling contains a category 1 hazard the local authority has a duty to take the appropriate enforcement action. Those that fall lower down the scale and pose a lesser risk are called category 2 hazards – when these occur the local authority may take enforcement action.
Full details of the measurement and modelling of these hazards can be found in the WHCS Technical Report on the WHCS webpage. Detailed analysis of the WHCS assessment of HHSRS is planned for publication in early 2019.
For further information, please see the statistical first release and supporting documents. Please see the National Indicators for Wales technical document for information relating to the national indicators. These can be found under Weblinks.

Frequency of publication

Every five years

Data reference periods


Users, uses and context

Please find this information in the related statistical publication, as per the given weblink.

Rounding applied


Revisions information


Statistical quality

Please find this information in the related statistical publication, as per the given weblink.