Chimney builders construct, repair and alter chimneys and related masonry in homes and other buildings. Their work may include building new chimney stacks or chimney breasts, rebuilding unstable or weather-damaged sections, repointing brickwork and replacing damaged bricks or stone. Some also carry out chimney removals or alterations when a fireplace or heating system is changed, with structural support considered where parts of a chimney are taken out. Typical services include inspecting visible masonry, repairing mortar joints, fitting or replacing chimney pots and cowls, and making good the roof junction around a stack, sometimes in coordination with a roofing contractor. Depending on the job, builders may work on flues or liners, or arrange for a suitable specialist to do so. Customers can expect advice on the scope of repairs, materials and access requirements; larger or structural alterations may need building control approval or input from a structural engineer.