EMB ERJ 145 ER/LR
Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument; Flight Crew Multiengine
Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Clearance; Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural Weight And Balance; Flight Deck / Cabin / Aircraft Event Smoke / Fire / Fumes / Odor
Air Traffic Control Provided Assistance; Aircraft Equipment Problem Dissipated; Flight Crew Overcame Equipment Problem; Flight Crew Requested ATC Assistance / Clarification; Flight Crew Returned To Departure Airport; General Flight Cancelled / Delayed; General Maintenance Action
Aircraft
During climb out; Pilot Monitoring noticed a smell in the flight deck.  Pilot Flying and Pilot Monitoring described the smell as a musty metallic smell.  Upon contact with ZZZ Departure; LAV SMOKE master warning was presented on EICAS. Pilot Monitoring ran QRH. The crew established contact with flight attendant who advised that the cabin smelled like burning plastic and no smoke was observed in the lavatory. After discussion between Pilot Flying and Pilot Monitoring; it was agreed the safest course of action was to turn to ZZZ in a timely manner. The crew performed the normal checklist as well as the overweight landing QRH procedure after determining our approximate landing weight. The airplane landed safely and was visually inspected by the airport fire command.  No abnormalities were noted and the aircraft taxied back to the gate; followed by fire command as a precaution.  Passengers deplaned normally at the gate.
Air carrier Captain reported a fume event during initial climb accompanied by a LAV SMOKE EICAS message. Flight crew executed a safe air return.