The improvements at the west London park will focus on restoring it to how it would have been in the 1800s, in the time of Pitzhanger Manor architect Sir John Soane.
Contractors from the Surrey-based landscapers will repave pathways to improve access for wheelchairs and buggies, and restore the heritage bridge, stonework and water features.
New grass, Regency species of trees and flowers, Regency-style ornaments and wooden benches are all planned alongside excavations to uncover the original landforms. Ponds will be restored with better habitats created for local wildlife. New playground equipment will also be installed.
Ealing Council leader Julian Bell said: "I'm looking forward to seeing the park's heritage come to life and for it to become a hub of community activity."