Book Green Nursery, formerly called Addison Pre-School, was established by a charitable trust deed by constitution and registered with the Charity Commission on 22 March 1993.

The charity was incorporated on 27 March 2009 as a company limited by guarantee and registered with the Charity Commission on 8 June 2011 to take over activities from the un-incorporated charity (charity registration number 1018982).

Today Brook Green Nursery is an affordable charity nursery that follows the Pre-school Learning Alliance and Pre-school Constitution 2005 guidelines. The name was changed from Addison Pre-school Limited to Brook Green Nursery Limited on 18 May 2015.

The governing documents are the Memorandum and Articles of Association. Trustees are recruited and appointed via personal contacts or recommendation and may be parents of children attending the pre-school. Being a small charity, there is no formal organisational structure but the charity has a Chairperson, a Treasurer, a Secretary and Trustees, who all provide valuable input.

The manager, staff and some parent volunteers also help run the charity.
Brook Green Nursery has grown from two full-time and two part-time staff to four full-time and two part-time staff.