Humberside Fire and Rescue Service rescued three people from their home in Dunvegan Road in the early hours of Saturday.
Around 15 minutes earlier, people in a house in Surbiton Close had to escape a fire which started at the front of the home.
Investigators believe the two fires were started deliberately in wheelie bins.
Around 30 firefighters were called to the blazes, which were less than half a mile apart.
The Fire Service is working with Humberside Police to try and find those responsible for the fires.