The body of man was found earlier this morning (Thursday) after a fire broke out in a three storey house in Bellings Road.
The alarm was raised at about 2.30am and the fire spread to an adjoining terraced property, causing extensive damage to the second floor of each house.
Six fire appliances attended the scene in total, and four of them remain there ensuring the properties are damped down and secure.
It is believed the deceased man found in the house lived alone.
A joint investigation is currently being carried out by fire investigation officers and scene of crime officers from the police to try and establish the cause of the fire.
Speaking at the scene, Haverhill Fire Station commander, Paul Goodman, said: “When we arrived the dormer window at the back and dormer window at the front had fire coming out of them, so the whole of the second floor was involved in fire.
“This rapidly spread to the property next door and then we had six appliances attending. We sent four and our control, realising the scale of the incident from the calls that were coming in, sent for an additional pump.
“We made it six appliances in all to stop it spreading to the adjacent property, which we managed to do.
“We went in to search and extinguish the fire and unfortunately came across the occupant. Nobody else was involved in the incident.
“There were about ten people evacuated from adjacent properties by the fire crews in really difficult conditions for them.
“The roof was collapsing about them and they had someone to find so it was an incredibly challenging situation for the teams in there and they did a great job in preventing the fire from spreading.”