The Hiscox research showed that 60% had not considered the items they accumulated over the years, items inherited or fluctuations in the value of jewellery, art or antiques.
The shortfall means brokers have an opportunity to speak to high net worth clients to ensure they are regularly taking stock of contents, getting regular valuations and reviewing insurance policies. Homeowners can then find the right insurance cover to suit their needs.
Andrew Cheney, risk and valuation advisor at Hiscox, said: "After a while even the special things in your home can seem like part of the furniture. This means that when it comes to estimating the value of your home contents, it can be easy to forget about items that actually hold reasonable value."