The specialist contractor has built 46 new independent living apartments spread over three buildings at Charters Village in East Grinstead.
The project, which includes cottages spread around a village green, was handed over in October 2016.
Other communal facilities include a lounge, bar, restaurant/bistro, shop, library, conservatory and meeting rooms in the clubhouse in Charters Towers.
James Player, Construction Director at Castleoak, said: "As market specialists, we're working closely with Charters' operator Retirement Villages to deliver high quality retirement housing.
"Our close partnership means we are continually refining the build specification to deliver the very best."
(LM)
