The new nursery coming to 1, Somers Road, Reigate, remains on course to open next year.
Kevin Potter, managing director of Cavendish Lodge Nursery School, says they are working on the interior layout and the rear of the building, and expect to open in September 2018.
The company already operates two sites in London, both rated as “Outstanding” by Ofsted.
The Reigate location, for up to 69 children, is opposite Micklefield School, and next door to the Co-op at the foot of Reigate Hill.
Cavendish went through a lengthy planning process to obtain permission to convert the office building, finally winning an appeal at the Planning Inspectorate earlier this year.