The Central Coast's second mosque is set to open amid howls of protest, building investigations and fears of radicalised Muslim elements infiltrating the Gosford group.

Nearly 100 Narara residents have signed a petition opposing the imminent mosque opening at 75 Showground Rd, where Gosford Islamic Society bought the land and existing building approvals for a "place of worship" from the Christian Brethren Church two years ago.

Central Coast Council is now investigating "whether any unauthorised works are being undertaken" there.

Tradies were working on the rundown building when the Express Advocate visited the location on Tuesday. However, a spokesman for the Gosford Islamic Society said plasterers were "just gyprocking" (interior walls).

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