The repair, restoration and building works at Eastcote House Gardens will begin on Monday, August 11.
The work in the historic gardens in High Road Eastcote, is funded by Hillingdon Council and the Heritage Lottery Fund (HLF).
The gardens, now owned by the council but maintained by volunteer group the Friends of Eastcote House Gardens (FEHG), were once the grounds of Eastcote House.
The first recorded mention of a house on the site is a cottage called Hopkyttes in 1494.
People living in Eastcote, local schools and scouts groups mucked in to see what they could discover in the grounds of the old house.
Last year, Eastcote House Gardens was given a grant of £1.3million by the HLF to restore the remaining Tudor buildings on the site , the stables, dovecote and walled garden.
The work is due to finish in March 2015 and the car park in the gardens will be closed to all vehicles for an indefinite period while builders are on site.
Lesley Crowcroft, chairman of the Friends group, said: "We are sorry for any inconvenience caused, but eventually we will have a fantastic community centre for all to enjoy."
The gardens will continue to be open to the public, but there will be some restrictions for access to parts of the gardens at certain times during the work.
Information about areas of restricted access and restrictions to car parking will be posted around the Gardens and on the FEHG website .
Pedestrian access to the gardens will not be affected and although the FEHG will not be able to hold any public events during the restoration work, the groups gardening sessions will continue as usual.
"We look forward to 2015 and welcoming everyone to our Summer Picnic and the next Archaeological dig," Mrs Crowcroft said.