At approximately 5.20pm on Saturday, crews were called to a house fire on Mitchell Avenue in Singleton Heights.

It is reported that a woman detected smoke from one bedroom before opening the door and discovering the entire room to be on fire.

Neighbors assisted in extinguishing the fire, resulting in a quick extinguish prior to emergency services arriving.

Fire and Rescue NSW station 444 checked and cleared hot spots for an hour and a half.

Unfortunately the house was extensively damaged.

As soon as crews were finished with the house fire, they were called to a grass fire at 6.40pm.

The grass fire was approximately 20m x 20m below Civic Park along the river bank and is being treated as suspicious.

Crews spent roughly 15 minutes extinguishing the surrounding area.

The cause of the fire is under investigation.

Following the grass fire, crews were called to a false AFA (Automatic Fire Alarm) at 7.10pm at Singleton Army Base.

After returning from the Army Base, Fire and Rescue NSW Station 444 then attended a house fire at Ravensworth at 7.35pm.

Soon discovering it to be the heritage-listed historical school house, the building had already lost half of the roof and was deemed unsafe for emergency services to enter.

Firefighters defensively fought the fire from outside as the brick walls were a falling hazard.

Seven fire trucks were at the scene including Darlington Rural Fire Brigade and Edinglassie Rural Fire Brigade who assisted Fire and Rescue NSW station 444 Singleton and together worked for more than an hour to bring the blaze under control.

The heritage-listed building had no occupation and no power, resulting in the fire being treated as suspicious.

The cause of the blaze is now under investigation.