The ventilation system required depends on the design and airtightness performance of the completed home.

Modern highly airtight homes require a properly designed ventilation strategy to provide fresh air, remove moisture and maintain good indoor air quality.

Many low-energy self-builds therefore incorporate Mechanical Ventilation with Heat Recovery (MVHR), which extracts stale air while recovering heat that would otherwise be lost.

Your ventilation system should be designed as part of the overall energy strategy for the house.