Last year, Scotsdales owner David Rayner offered land and support to get a new facility built after the centre had been unable to find a suitable location to relocate its services. Staff have helped raise money for the project through fundraising events.
Other members of the community, including plasterers, plumbers and scaffolders, have offered their services for free, with many of the volunteers either cancer sufferers or survivors.
A representative said the centre still needed to raise about £300,000 but it was expected that would be achieved through fund-raising events and contributions.
The Cambridge Cancer Help Centre offers support to cancer patients, families and friends by teaching methods of relaxation, providing counselling and non-medical advice, and offering various complementary therapies.
Cambridge Cancer Help Centre co-ordinator Ann Dingly said: "It has been amazing watching the community rally around and help us get the centre built and established. We are very grateful to Scotsdales as without them we would not have been able to relocate and expand."