Rebuilding cost is the core driver most homeowners underestimate. A policy has to cover what it actually costs to reconstruct the house today, in current material and labour prices, not what the house last sold for, so renewal premiums climb even on a house with no claims history.
Climate exposure adds a second pressure. Insurers that have paid out more claims tied to severe weather in a region are repricing that risk across the board rather than only for the specific properties that were affected.
A non-renewal or a sharp premium increase is worth flagging to your lawyer or lender before it complicates a sale. Get your hand-reviewed valuation from Joel Dyck.