Emergency services received triple zero calls for help just before 2pm after witnesses noticed a house was alight at Greta, north west of Newcastle.

Two Fire and Rescue NSW (FRNSW) teams from Greta and Rutherford were tasked to the single-level home on The Barracks Close but backup was quickly called in.

By about 2.45pm on April 15, half-a-dozen fire trucks from FRNSW and the Rural Fire Service (RFS) were actively fighting the fire and protecting surrounding properties.

A FRNSW spokesperson confirmed the homeowner had managed to evacuate safely by themselves before emergency services arrived.

The spokesperson said the fire was contained to one side of the building but breached the ceiling line.

Firefighters were set up on each side of the property and were battling the blaze from inside.

Fire protection lines were put in place to stop the flames spreading to neighbouring homes.

The FRNSW spokesperson confirmed the fire had been extinguished by Monday evening and it's understood more than half of the home suffered smoke and heat damage.

The cause of the fire had not yet been confirmed.