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IoT is the abbreviation for Internet of Things, so being "enabled" or "compatible" means appliances or systems in the home that are connected to the internet and controlled remotely, usually with a smartphone. Examples include refrigerators that can identify what food needs to be purchased and heating systems that can be adjusted from offsite. Also called "smart home" devices.

Material used for filling a trench or the excavation around a foundation wall.

A device that uses a refrigerant system to heat a building in the winter by absorbing heat from the exterior air. In the summer it does the reverse, drawing heat from the building to cool it. The ability of air source heat pumps to provide necessary heat declines as the outside temperature drops, so a back-up heat source is often required.

The ability of a home's building envelope to resist air leakage and therefore an indication of energy efficiency.

Sometimes called housewrap, these impermeable materials go on the exterior of a building under wood, vinyl siding or other finishing materials to prevent air and water infiltration. Commonly used products include Tyvek.

A house, amenity or product that's designed for access or use by people with disabilities. Also known as barrier-free or universal design.