Approved Document F: Ventilation in New Build Homes
Plain English guidance on ventilation, extract fans, background ventilation and airflow in new build homes.
Approved Document F gives guidance on ventilation requirements. For new build homeowners, ventilation can affect comfort, condensation, moisture control, odours and air quality.
Why ventilation matters in a new build home
Ventilation helps remove moisture, odours and stale air from the home. It is particularly important in areas such as kitchens, bathrooms, utility rooms and rooms where background ventilation or extract ventilation is provided.
Homeowners may notice issues such as extract fans not working, trickle vents missing or closed, poor airflow, condensation, unusual noise, staining or ventilation controls that are unclear.
Common ventilation issues homeowners may notice
Extract fans
Fans in bathrooms, kitchens, en suites or utility rooms should be checked for operation, noise, damage, controls and whether they appear to be extracting air.
Background ventilation
Trickle vents or background ventilators should be checked for damage, poor fitting, missing parts, blocked openings or unclear operation.
Condensation concerns
Condensation, staining or signs of moisture should be recorded clearly, especially where ventilation may not appear to be working as expected.
Airflow and grilles
Grilles, terminals and vents should be checked for visible damage, obstruction, poor fitting, missing covers or incomplete installation.
Controls and isolation
Switches, controls, boost functions and isolators should be checked where visible so homeowners understand how the system is intended to operate.
Noise or poor operation
Fans or ventilation systems may appear noisy, weak, intermittent, poorly installed or not operating when expected.
Where Approved Document F may be relevant
Approved Document F may be relevant when considering ventilation, extract systems, background ventilation and airflow in new build homes. It is part of the Building Regulations guidance for Wales.
This article is a plain English overview for homeowners. It is not Building Control approval, legal advice or a full technical assessment.
Where snagging fits in
A professional snagging inspection records visible defects, damage, incomplete work, poor finishes and workmanship concerns.
A snagging inspection is not the same as Building Control approval and does not replace decisions made by Building Control, warranty providers or other relevant bodies.
Where a visible ventilation issue may relate to Building Regulations guidance, warranty standards, safety, workmanship or manufacturer guidance, it can be recorded clearly so the homeowner has evidence to raise with the developer or relevant party.
Key takeaway
Ventilation issues should be recorded clearly with photographs, locations and descriptions. Approved Document F may be relevant to ventilation and airflow, but homeowners should keep the difference clear between snagging evidence, Building Control approval and warranty provider decisions.