Emergency services were called to a fire at West Street around 8am on Saturday morning to find a single-storey cottage well alight.

"We initially had two vehicles attend the scene, and crews proceeded to get to work in order to control the fire," Fire and Rescue NSW Bathurst station officer Sandy Collins said.

"On arrival, we ascertained all four occupants had been evacuated, but they expressed concern about the welfare of their pets.

"Firefighters conducted a search and rescue of the property for the pets and, unfortunately, one pet was found deceased."

The fire was brought under control within half an hour, and was fully extinguished by 10.00am, with 75 per cent of the house damaged.

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Ambulance crews were called to the scene to treat occupants and firefighters for smoke inhalation, with two occupants transferred to hospital for further treatment.

The occupants were discharged hours later.

Mr Collins said approximately 20 firefighters were required to bring the blaze under control, including a Hazmat unit.

"We were able to knock down the fire quickly, but it did get into the roof, so we had to spend some time taking off roofing sheets to ensure the fire was eradicated," he said.

"Several firefighters in breathing apparatus made entry and we had a crew on the roof."

When firefighters arrived at the scene, the front bedroom of the property was visibly alight, and had spread to other areas of the residence.

"The whole front of the home was enveloped in fire on arrival, including the front porch," Mr Collins said.

"There was a deep-seated fire in one of the bedrooms that had entered the roof, so we had to remove sheeting iron to fully extinguish the fire."

"The Hazmat van provided us with refreshments and rehabilitation, and assisted us with air monitoring."

Essential Energy also attended to disconnect supply to the house.

Police and Fire Rescue NSW are still investigating the cause of the blaze.