BCMS Commencement Notices — Single Residential Units 2014

A Commencement Notice (CN) is a notification to a Building Control Authority (BCA) that a person intends to carry out either works or a Material Change of Use to which the Building Regulations apply. The notice must be given to the authority not more than 28 days and not less than 14 days before the commencement of works or the change of use. Once validated by the building control authority, works must commence on site within the 28 day period.

In the case of large developments, it is practical to submit a CN for each phase. The number of units scheduled to commence under a specific phase should be recorded in the CN.

Number of single residential units commenced - the total number of one off residential units which are associated with the commencement notices submitted for that month. This figure is included within the total number of residential units commenced.

The Local Government Management Agency (LGMA) operates the Building Control Management System (BCMS). It facilitates CNs to be submitted online. The Department cleans and collates the data before publishing it on a monthly basis.

This data series on commencement notices is available from March 2014. It is broken down by local authority, number of notices for residential development, number of residential units and the number of one-off residential units. More granular data on commencement notices can be found at https://www.localgov.ie/

Data from March to May 2019 has been revised. The figures for those months were originally under-stated due to a data processing error.

开工通知（Commencement Notice，CN）是指向建筑监管当局（Building Control Authority，BCA）提交的正式告知文书，用于申报拟开展建筑工程或适用建筑条例的用途实质性变更。该通知须在工程开工或用途变更实施前14天至28天内提交至监管当局。经建筑监管当局审核通过后，相关工程须在28天内启动现场作业。
针对大型开发项目，按施工阶段分别提交开工通知更为务实。各施工阶段拟开工的住宅单元数量，须在对应开工通知中予以登记。
当月开工独栋住宅单元数量：指当月提交的全部开工通知所关联的独栋住宅单元总数量，该数据包含在当月住宅开工总单元数范畴内。
地方政府管理局（Local Government Management Agency，LGMA）负责运维建筑监管管理系统（Building Control Management System，BCMS），该系统支持开工通知的线上提交。相关部门会对采集到的数据进行清洗与整合后，按月对外发布。
本开工通知数据集的时间跨度始于2014年3月，数据按地方当局、住宅开发开工通知数量、住宅单元总数及独栋住宅单元数量进行分类统计。更细粒度的开工通知相关数据可通过https://www.localgov.ie/查询获取。
2019年3月至5月的相关数据已完成修订。由于当时的数据处理失误，该时段的原始统计数值存在低估情况。