Three men wearing balaclavas were seen leaving the home in Reeves Way, Eastfield, at around 1.50pm on Wednesday, November 17.
They left the scene in a black Audi A3 in possession of £10,000 worth of jewellery and £8,000 cash from a safe.
DS Justin Parr said: "Other than the fact the offenders were men wearing balaclavas, we do not have a description of them - however I am urging anyone with information to get in touch."
Anyone with information about the incident, or who may have seen suspicious activity in the area at the time, is urged to contact police online or use the online web chat function and quote incident 240 of November 17. Those who do not have access to the internet can call 101.