Firefighters are tackling a blaze involving three houses.
Five fire engines and an aerial platform were sent to Waunfawr, near Caernarfon, Gwynedd, after being called at about 10:30 GMT on Sunday.
There are no reports of any injuries, said North Wales Fire and Rescue Service.
The A4085 road is closed as firefighters from Caernarfon, Bangor, Harlech and Conwy tackle the blaze at Stad Glyn Afon.