Reinstatement Cost (Insurance) Valuation Guide

Most homeowners with buildings insurance have a sum insured on their policy. But do you know how that figure was arrived at, and whether it accurately reflects the cost of rebuilding your property from scratch? Under-insurance is more common than many people realise.

A property insurance valuation - more formally a Reinstatement Cost Assessment - is the professional way to establish the right sum insured and give you confidence your buildings cover is adequate.

What Is a Reinstatement Cost Assessment?

A Reinstatement Cost Assessment (RCA) is a formal calculation of how much it would cost to rebuild your property from the ground up if it were completely destroyed. It is not the market value - it is a construction cost figure covering labour, materials, professional fees, demolition and compliance with current building regulations. It is carried out by a qualified surveyor.

Reinstatement Cost vs Market Value

Market value reflects what a buyer would pay, taking account of location, demand and land value. Reinstatement cost reflects the actual cost of rebuilding the structure, regardless of land value. The two rarely match, and using market value as a proxy for insurance is not reliable.

What Does Under-Insurance Mean in Practice?

If your sum insured is lower than the true reinstatement cost, you are under-insured. In a major claim, insurers may apply the principle of average - if your property would cost 300,000 to rebuild but you're insured for 200,000, the insurer may reduce a valid claim by a third, leaving you to fund the shortfall.

Industry figures consistently suggest a significant proportion of UK homes are under-insured, partly because sums are set at purchase and not updated as construction costs rise.

Who Needs a Reinstatement Cost Assessment?

An RCA is particularly important for properties with unusual or non-standard construction (timber frame, solid stone, listed features), older properties with period materials, extended or altered properties, properties not reviewed for several years, and leasehold properties where you manage or question the building insurance.

What Does a Reinstatement Cost Assessment Include?

A professional RCA includes an inspection to assess size, construction type, condition and features affecting rebuild cost. The surveyor measures the gross external area and applies current professional cost data to produce a calculated reinstatement figure, presented in a report suitable for submission to your insurer.

How Often Should an RCA Be Reviewed?

Professional guidance suggests revisiting a formal RCA every three to five years, or sooner if significant works have been carried out or construction costs have changed materially. Index-linking helps but is no substitute for a properly calculated base figure.

Is It the Same as a Mortgage Valuation?

No. A mortgage valuation establishes open market value for lending; an RCA establishes rebuild cost for insurance. They are different assessments for different purposes and typically produce different figures. A mortgage valuation figure should not be used as your buildings insurance sum insured.

Frequently Asked Questions

Can I use an online rebuilding cost calculator? Online calculators give a rough indication for standard properties but are not reliable for older or non-standard buildings. A professional RCA provides an evidenced, defensible figure.

What happens if I'm found to be under-insured after a claim? Insurers may apply the principle of average, reducing the payment proportionally to the shortfall in cover.

Find Out More from NIVEK

If you'd like to discuss a Reinstatement Cost Assessment for your property, NIVEK Surveying Services can help. We are RICS registered surveyors covering Nottingham, Derby, Leicester, Coventry, Mansfield and the wider East Midlands.