Fire surveys undertaken by two surveyors. Where a risk is very large and shared by two or more insurers (coinsurance), the lead insurer undertakes the survey but may involve the insurer holding the next largest proportion. One insurer may survey the building and the other surveys the contents. It may also occur where a fire surveyor is accompanied by a specialist surveyor (e.g. sprinkler leakage specialist). In other instances, the company surveyor may be accompanied by the broker’s surveyor.