The remaining parts of the building had suffered heat, smoke and water damage.
Firefighters could not immediately determine a cause.
A police spokesperson said a police investigation into the fire was ongoing.
“A scene examination was conducted.”
A local resident who knows the occupants, who requested to not be named, told Hawke’s Bay Today the family “lost everything” in the fire.
“The lady who was occupying the house is an amazing asset to our community.
“She gives back to our rangatahi, which shows through the support that has wrapped around her and her whānau to ensure they recover as best as they can in this tragic situation.”
Police said anyone who was in the area of the fire on Thursday morning and saw any suspicious activity, or have any information that may assist police with their investigation should contact police on 105, or online https://www.police.govt.nz/use-105 using update report and reference file number: 230921/9934.
“Alternatively, you can report any information anonymously via Crime Stoppers on 0800 555 111.” — Hawke’s Bay Today