Yes. Most policies state that you are responsible to notify the insurer (via your insurance broker) within 30 days of starting work on any improvement, extension or addition to your dwelling. This is important to ensure that the replacement value of your home is sufficient in the event of loss or damage, as this may affect the guaranteed replacement cost provision in your policy. If you've made changes to your property, please call an OTIP service representative to discuss the impact on your insurance policy.