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The 3-5-7 rule is a standardised sampling guideline rooted in the Asbestos Hazard Emergency Response Act (AHERA) — originally a United States federal regulation, but widely adopted as an international best-practice framework. It dictates the minimum number of bulk samples that must be collected from any suspect asbestos-containing surfacing material, based on the total area of the homogeneous zone being tested.

Discovering a material you suspect is asbestos in your home can be alarming. However, in the UK, the presence of asbestos is common in properties built or refurbished before the year 2000. The key to safety is not panic, but knowledge.