In flats and maisonettes the risk is often in the parts nobody owns individually: service risers, ducting, communal cupboards and ceiling voids, where insulating board and lagging were widely used. Inside a flat, textured coatings and floor tiles are the common ones. That matters in Newcastle upon Tyne because flats and maisonettes are the largest group there, 37.5% of 141,750 properties, and around 81.6% of the stock predates the 1999 asbestos ban. The next largest group is semi-detached houses at 25.3%, usually with a garage or outbuilding of its own to check. The largest group was built between 1900 and 1939. Property from this period was built before asbestos use peaked, so where asbestos is present it usually arrived with later work: post-war repairs, added textured coatings, new outbuilding roofs and heating upgrades. That later work is common enough in housing of this age that it still needs checking before anything is disturbed. By period, 12% were built before 1900, 23.2% between 1919 and 1939 and 18.3% since 2000. None of that tells you whether a particular property contains asbestos; only a survey or a laboratory test can.