To keep your Building Sum Insured accurate: Get a professional rebuild cost valuation from a qualified surveyor. Use reputable online rebuild calculators for estimates. Review your policy regularly to reflect any property changes or rising construction costs. Include all rebuild-related costs such as demolition, site clearance, professional fees, and VAT if applicable.

If your property is underinsured, any insurance payout you receive may be reduced in proportion to the shortfall. This is due to the "Condition of Average," which means that if you're only insured for half of the actual rebuild cost, any claim may also be paid at only half of its value—potentially leaving you out of pocket.

The Building Sum Insured is the amount for which your property is insured, covering the full cost to rebuild it in the event of total destruction. This includes demolition, debris removal, professional fees, and materials. It’s important that this figure reflects the true rebuild cost—not just the market value—to ensure you’re fully protected.