We all know how important it is to make sure we lock the door when we leave the house, but it seems a lot of us still succumb to forgetfulness - even though it might cost us dearly.
A new survey by the Association of British Insurers (ABI) has found that almost a third of us leave doors and windows open when we go out, giving thieves ample opportunity to enter our home.
One in four of us also admit to having no contents insurance.
To help us protect our homes better, the ABI has now published a guide containing advice on home insurance and common insurance problems, for example when we go on a holiday and leave our homes unoccupied.
Nick Starling, Director of General Insurance at the ABI said: "Common mistakes, such as leaving doors unlocked and windows open, could invite thieves, putting your possessions at risk.
"And with one in four households without contents insurance, homeowners could be left footing a big bill to replace valuables.
"Following sensible security measures and ensuring your property and its contents are adequately covered are the wise steps people should follow to protect their homes."