The contractor has reached financial close on a £27m development in White City for West London LIFT, Notting Hill Home Ownership; and Hammersmith & Fulham Primary Care Trust.
The White City scheme will feature a new health and social care centre, 170 mixed tenure apartments and further community facilities.
The Partnerships business has also won three new major affordable housing developments for established housing association clients.
The first involves a 60-home mixed tenure project in the Aylesbury Estate area of South London for London and Quadrant, valued at £8.1m.
The second is the St Edmunds Terrace development in North London for The Guinness Partnership, which features a mix of 64 affordable homes and private sale homes worth £10.4m in total.
The third comprises the Three Colts Lane scheme in Tower Hamlets, which will see 67 mixed tenure homes provided for Peabody with a contract value of £10.7m.
Galliford Try Chief Executive Greg Fitzgerald said: “We are delighted at the success of our Partnerships brand in winning these significant contracts within the Greater London area.
“The track record of the business goes before it and we look forward to working with our partners to develop the high quality public buildings and affordable housing that these communities are asking for.”