Thieves stole electrical items and jewellery after breaking into a house in Dorothy Road, Kettering, at some point on Friday, September 25.
The offenders forced their way into the back of the house between 8.20am and 3.20pm.
They escaped with a stash of electrical items and jewellery and it is believed they ran off down an alleyway.
The offender is believed to be a white man who wore dark coloured clothing, including a dark woolly hat and had a rucksack on his back.
Witnesses or anyone with information is asked to call police on 101 or Crimestoppers anonymously on 0800 555111.