At this time, very high broadband network, especially FTTH (Fiber To The Home) deployment, is a major challenge for operators. One of the main issues is the terminal part of the network with the introduction of optical fibre cables into building up to the apartment with technical difficulties but also administrative ones. This document deals with the solutions which could be deployed to try to answer to building owners, operators and customers needs. This document refers to the single mode optical cabling in new and existing buildings. The first part of the section explains the main constraints of a common optical infrastructure for several operators, offering FTTH services to customers in the same building. Then the paper describes possible cabling solutions which could be deployed in buildings.