What is a healthy building?

A healthy building consists of many factors. In terms of air quality, good ventilation such as a mechanical ventilation and heat recovery system combined with a breathable construction will help to moderate humidity and provide clean filtered fresh air, preventing condensation and mould. Selecting materials that do not emit volatile organic compounds (VOCs) or other harmful chemicals is crucial, and natural materials are always encouraged. Some materials, such as sheep wool insulation and earth and clay plasters, will help to reduce airborne contaminants. Airtight construction will enhance comfort by reducing draughts and external pollutants. Natural daylight is another important factor in a healthy building, as is the creation of views, especially of green spaces and vegetation which help with mental wellbeing.