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Managing Agents Guide to Building Insurance Valuations

Reinstatement cost assessments, day one versus declared value, common underinsurance pitfalls and when to commission a professional valuation.

Guidance NoteApril 2026Insurance
Overview

Getting insurance valuations right

Managing agents have a duty to ensure the buildings they manage are adequately insured. A reinstatement cost assessment carried out by a chartered surveyor is the most reliable way to determine the correct sum insured. Getting it wrong can leave leaseholders exposed to significant financial loss in the event of a claim.

What a reinstatement cost assessment covers

The RCA estimates the cost of completely rebuilding the building, including demolition, site clearance, rebuilding to the current specification, professional fees (typically 12 to 15 percent), and VAT where applicable. It is not the market value. The surveyor inspects the building and calculates the cost based on size, construction type, specification and special features.

Day one vs declared value

Day one value includes an inflation uplift (typically 50 percent) to cover cost increases during the policy and rebuild period. Declared value is the base figure without the uplift, with the insurer applying their own index-linking. Using the wrong figure for the policy type is a common cause of underinsurance.

Common pitfalls

The most common pitfalls are failing to commission a professional RCA at all (relying on online calculators or outdated figures), failing to update after significant building works, confusing day one and declared values, excluding demolition costs or professional fees, and failing to account for special features such as listed building status, basement construction or unusual materials.

FAQ

Frequently asked questions

What is a reinstatement cost assessment?

An estimate of the cost to completely rebuild a building, including demolition, rebuilding, professional fees and VAT. This figure is used as the sum insured on a buildings insurance policy.

What is the difference between day one and declared value?

Day one includes an inflation uplift for the policy and rebuild period. Declared value is the base figure with the insurer applying their own index-linking. Using the wrong figure for the policy type causes underinsurance.

How often should an RCA be updated?

Full assessment every three years with desktop index-linked updates in between. Earlier reassessment after significant works or major construction cost changes.

What happens if the building is underinsured?

The insurer pays only up to the sum insured for a total loss. For partial losses, average clauses may proportionally reduce payouts. The shortfall falls on the building owner or leaseholders.

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