Glaziers cut, supply, fit and repair glass in homes, commercial premises and public buildings. Work may include replacing cracked or broken panes, fitting mirrors and splashbacks, installing glass doors and partitions, and glazing shopfronts or internal windows. They can advise on suitable glass for a particular location, including toughened or laminated safety glass where appropriate, as well as decorative, patterned or obscure glass for privacy. Double glazing businesses supply and install windows and doors made with two panes of glass separated by a sealed gap, often within uPVC, timber or aluminium frames. Services commonly include measuring openings, removing old units, fitting new frames and glass, and replacing failed sealed units where condensation has formed between the panes. Some businesses also repair hinges, handles, locks, seals and other window hardware, or install secondary glazing.