Solid wall insulation is a construction technique and retrofitting solution designed to enhance the energy efficiency of buildings, especially those with solid walls, which lack a cavity between inner and outer layers. This insulation method involves adding an insulating layer to either the interior or exterior surface of the solid walls, significantly improving a building's thermal performance.

Improved Thermal Efficiency: Solid wall insulation helps reduce heat loss through the walls of a building, thereby improving its thermal efficiency. This means that in cold weather, the interior remains warmer, and in hot weather, it stays cooler, creating a more comfortable living environment. Solid wall insulation can also act as a sound barrier, reducing the transmission of noise from outside or neighboring properties. This is particularly beneficial for homes in noisy urban areas or near busy streets.