UPDATE 4.15PM: Buderim resident Kristie Symes knew it wasn't a false fire alarm once she saw smoke coming from her building's basement.

Detectives are treating a car fire in Mrs Symes' Starling St apartment building as suspicious, working with the Queensland Fire and Emergency Services to determine its cause.

Mrs Symes and her mother Diana Sheehy were among those who evacuated about 4.15am today.

The source of the smoke was a dark-coloured Nissan sedan parked in the basement carpark.

"The alarm started going off and telling us to go downstairs," Mrs Symes said.

"It has happened a few times before hand but it was just false alarms so everybody sort of took their time going down.

"Nobody got dressed because we just assumed we would be back up in our rooms in a few minutes but then when we were down here for a little while we started seeing smoke coming out of the vents that are above the basement.

"Then we realised we weren't going back to bed any time soon."

Mrs Sheehy estimated about 100 people were evacuated.

"Everyone was really good about it," Mrs Sheehy said.

"They all just did what they were told and we all just waited and then went back to our rooms."

Residents were given the all clear to return to their units about 6.30am.

EARLIER: POLICE are awaiting a fire investigator to arrive at the scene of a suspicious blaze under a Buderim unit complex this morning.

Sunshine Coast district duty officer Senior Sergeant Matt Campbell said it was being investigated to see whether or not a fire in a sedan located in a basement car park had been deliberately lit.

Sen Sgt Campbell said one of the complex residents had smelled smoke and reported the fire before smoke alarms went off this morning.

He said those actions had helped greatly in minimising the damage.

"They (fire fighters) were able to put it out before it took hold of the vehicle," Sen Sgt Campbell

"Where it's located is a really contained environment so it could have really got going."

The Criminal Investigation Branch is investigating.

INITIAL REPORT: FIRE investigators are in Buderim this morning after a vehicle fire at an apartment block in Starling St. 

Large amounts of smoke issued from the scene. 

Residents evacuated while the fire was being extinguished.

A 000 call at 4.15am reported the fire being in the rubbish room at the complex but when crews arrived they found a vehicle in flames. 

Four crews worked in breathing apparatus and had the fire put out by 5am. 

No one was injured in the fire.

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