Ventilation in Homes: Key Findings from a National Survey

The Survey

The study surveyed 1,861 homes across Great Britain using a questionnaire administered by YouGov. The questionnaire collected data on household demographics, dwelling characteristics, ventilation systems, and occupants' behaviours and perceptions regarding IAQ​)​. This large-scale approach aimed to fill the gap in existing data on ventilation provision in British homes, particularly given the lack of prior studies at this scale.

Key Findings

One of the most striking findings from the survey is that 71% of homes did not have ventilation provisions that met the current building standards​​. These standards, which require mechanical ventilation in kitchens and bathrooms and trickle vents for background ventilation, are crucial for maintaining good IAQ.

Despite the importance of these standards, compliance was notably low, especially in older homes. Only 22% of homes built before 1991 had the required ventilation provisions, compared to a higher, yet still inadequate, 59% compliance rate in homes built after the standards were introduced​​.

Moreover, the survey revealed that only 11% of respondents had both mechanical ventilation and trickle vents, along with receiving advice on how to use their ventilation systems effectively. This lack of knowledge and proper usage exacerbates the problem of poor IAQ, as occupants may not utilise the systems effectively even when they are present​​.

Health Implications

The study underscored the significant health risks associated with inadequate ventilation. Approximately 22% of respondents reported mould or damp issues in their homes, which are often linked to insufficient ventilation​​. The health impacts of mould and damp can be severe, including exacerbating asthma and other respiratory conditions.

The death of a young child, Awab Ishak in England in 2022, attributed to a lack of ventilation, has heightened public awareness and led to new government guidelines for landlords to address ventilation issues​​. This tragic incident and the subsequent media coverage highlight the urgent need for improved ventilation standards and practices.

Energy Efficiency and Climate Considerations

Ventilation also intersects with energy efficiency and climate change concerns. Proper ventilation helps remove pollutants and moisture but can also lead to heat loss, accounting for up to 50% of heat loss in well-insulated buildings​. This creates a conflict between maintaining good IAQ and reducing energy consumption and carbon emissions. The study emphasises the need for policies that balance these factors, ensuring that homes are both healthy and energy-efficient​.

Policy Recommendations

Based on the findings, the authors recommend several policy actions:

1. Develop policies to ensure suitable ventilation in existing homes, including regular inspections and maintenance.

2. Enhance Energy Performance Certificates (EPC) to report on ventilation and its health implications.

3. Mandate ventilation standards in the refurbishment and retrofitting of homes to protect against health risks.

4. Ensure that new homes comply with current ventilation regulations.

The study calls for further research to reduce uncertainties in modelling ventilation behaviour and its impact on IAQ and health. Detailed empirical investigations into the actual performance of ventilation systems in occupied homes are necessary to inform effective policies and interventions​​.

This national survey by Van Rooyen and Sharpe highlights a critical gap in ventilation provision in British homes and its implications for public health and energy efficiency. The findings advocate for comprehensive policies and standards to ensure that all homes are adequately ventilated, safe, healthy, and energy-efficient. Addressing these issues is essential for improving the living conditions of millions of residents and achieving broader environmental goals​

Simon Jones

Air Quality Matters