"They have started work on the traffic lights at Marmion Avenue and the two new ovals," Two Rocks Yanchep Residents� Association (TRYRA) president Peter Wimsett said.
He said work had started on a community room at the changerooms at Oldham Park, with the playground removed.
The City of Wanneroo is responsible for the three projects, which include installing traffic signals at the intersection of Marmion Avenue, Lagoon Drive and Peony Boulevard.
That project and the nearby 100sq m addition to the existing Oldham Park facilities were prompted by community campaigns by TRYRA and the Yanchep Red Hawks Football Club for better infrastructure.
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Earthworks for the Yanchep playing fields started this year after the City and developer Yanchep Beach Joint Venture finalised the deed of agreement.
The football club began calls for more sports facilities in 2010 and the City started negotiations with YBJV on the project.