It started at the 60-hectare facility near Heathrow on 1 July and the 17-strong existing landscaping team transferred to Q&S under the TUPE regulations.
Q&S' managing director Sue Payne said: "It’s a fabulous win for us. Stockley Park Estate Management Limited, have a reputation for demanding the very best standards from their service partners, so we are delighted that they have recognised our industry-leading and award-winning reputation for customer satisfaction, provision of the highest standards of quality of service and biodiversity management.
"Our pro-active onsite landscape and biodiversity management practise ensures that the service we provide is tailored and precisely targeted, which is an important factor in today's economic climate. "We are extremely proud of Q&S' role going forward in working alongside Stockley Park Estate Management Limited on enhancing the biodiversity on site and raising the quality of the overall experience to everyone who works or visits Stockley Park, and excited to be part of the evolution of the Park at this exciting time."
Stockley Park estates director Pieter Borchardt said that the quality and maintenance of the parkland was hugely important to Stockley Park’s status as a premier business park.
Q&S was established in 2000 and predominately manages corporate and private sector grounds maintenance contracts.