House builders are required to get adequate insurance and guarantees on what they are building whether it is through the NHBC or through a company such as Zurich Municipal. Structural calculation, assembly drawings and details are supplied by Taylor Lane for submission to the Local Authority by the client or the client’s representative. N.H.B.C. HB353B Certificate/Engineers Structural Certificates are provided by Taylor Lane. The structural drawings and engineering for building control approval for the structural shell are generally completed by Taylor Lane approximately 2 weeks before the delivery of the frame. The client or client’s Architect makes the main application before work on site begins to get conditional approval or similar by stating that the timber frame structural shell is by specialist manufacturer. The timber frame drawings and engineering are then sent to be added to the application once completed.