That Draught Isn't Coming From Where You Think

A standard UK letterbox can let in as much cold air as an open window left ajar. We compare the best brush and flap draught excluders to seal it properly.

Most homeowners spend money sealing windows and doors and completely overlook the letterbox — a rectangular hole cut straight through the front door with, in a lot of older homes, nothing but a thin metal flap covering it. Letterbox draught excluder brushes fit over the opening and block airflow while still letting post through easily. We've compared six options across brush-style, flap-style, and combined designs.