When crews arrived at the end of Cooksley Road they could see the fire but were unable to drive the engine any further as a vehicle was parked on the corner.
Crews got out of the vehicle and ran hoses down the road before a local resident came and moved the vehicle.
The fire, which is it believed was started deliberately, affected the windows and doors of a property.
An Avon Fire & Rescue Service spokesman said “Fortunately the occupant, a man in his 60s, who was inside the property at the time, was unhurt. Had firefighters been further delayed, the incident could have been much worse.
“Avon Fire & Rescue Service would like to remind drivers to think carefully before parking their vehicles.
“Never double park or park on corners and always leave room for a fire engine to get through in the event of an incident. Fire engines are much larger than standard vehicles and need plenty of room to manoeuvre.”