Data has been collected on a monthly basis from Residential Commencement Notices, received by all of the 37 Building Control Authorities. This series started in January 2004 Local Authorities or builders carrying out work on behalf of a local authority are not required to submit Commencement Notices provided that the work in being carried out in that local authority's administrative area. Data for the remainder of 2014 and onwards can be found on the website - it is not directly comparable with this dataset. The most current data is published on these sheets. Previously published data may be subject to revision. Any change from the originally published data will be highlighted by a comment on the cell in question. These comments will be maintained for at least a year after the date of the value change.