Winter weather often makes it difficult for builders to get on with the job. In very severe winters, sites can be at a standstill for weeks on end. Even in less severe weather, building operations are more difficult and working hours are bound to be reduced. Frost, rain and high winds can also play havoc with newly built work unless proper precautions are taken. Some of these problems can be reduced by advance planning, good preparation of the site, care of stored materials and protection of completed work. This Guide gives some tips and advice from BRE on how to keep interruptions to building to a minimum during winter weather, how to protect materials, and when it is vital to stop work.