26/08/2026
Critical lighting is one of those building terms most homeowners won't come across until they're well into a renovation.
It describes what happens when light hits a wall or ceiling at a shallow angle, making even very small variations in the surface much more noticeable.
Large windows, skylights and certain types of artificial lighting can all create critical lighting conditions - particularly on long, uninterrupted walls and ceilings.
It's something worth considering during the design and planning stage because there are ways to reduce its impact. The direction plasterboard is installed, the level of plaster finish specified and the positioning of lighting can all make a difference.
It doesn't necessarily mean avoiding large windows or changing a design you love. It's simply about understanding how light will interact with the finished surfaces and planning accordingly.
Like many parts of a renovation, it's much easier to consider these details before construction begins than try to address them afterwards.