Building Reinstatement Cost
Your building reinstatement cost, explained.
The single most important figure on your buildings insurance, what it means, how a RICS‑regulated surveyor calculates it, and how to get an accurate one for any UK property.
What it is
The cost to rebuild, not what it’s worth.
A building reinstatement cost is the amount it would take to rebuild a property from the ground up if it were completely destroyed. It has nothing to do with the property’s market value or what you paid for it, land and location are stripped out entirely. What remains is the true cost of construction: labour, materials, professional fees and everything the law now requires you to do when you rebuild.
This figure is what your buildings insurance sum insured should be based on. Get it right and a total loss is fully covered. Get it wrong, usually too low, and you carry a shortfall you may not discover until you claim. Confusing rebuild cost with market value is one of the most common reasons UK buildings end up underinsured.
How it’s calculated
From floor area to final figure.
Step 1
Measure the building
A surveyor establishes the gross internal floor area, construction type, age and any non‑standard features.
Step 2
Apply live cost data
Current BCIS build‑cost rates for the property’s location and type are applied to the measured floor area.
Step 3
Add the essentials
Demolition, professional fees, outbuildings, boundaries and an inflation allowance are added to the base build cost.
Step 4
Produce the figure
A RICS‑regulated, broker‑ready sum insured is documented and ready to present to your insurer at renewal.
Who needs it
Every insured building has one.
Homeowners & landlords
Anyone whose buildings policy needs an accurate sum insured rather than a guess or an old estimate.
Flats & blocks
Freeholders and leaseholders who must insure the whole structure for its true rebuild cost.
Commercial owners
Offices, retail and industrial premises where the rebuild figure drives the premium and the cover.
Brokers & managing agents
Professionals needing a defensible figure to place or renew cover with confidence.
Why it matters
Get the number wrong and your claim shrinks.
Research across the UK insurance market consistently finds that the large majority of buildings are underinsured. It usually happens quietly: a sum insured is set once, then rolled forward year after year while real build costs climb. UK inflation reached a 41‑year high of 11.1% in October 2022 (ITV News), and construction costs climbed with it.
The BCIS Materials Cost Index shows construction material prices up more than 20% since 2020(BCIS). A figure that looked right a couple of renewals ago can now sit well below the true cost of rebuilding, even when nothing about the building itself has changed.
The catch is the condition of average. If you are insured for less than the true reinstatement cost, the insurer can reduce every claim in the same proportion, so a property insured for 80% of its rebuild cost can see even a small claim cut by a fifth. RICS recommends a full reassessment at least every three years, with annual index‑linking in between, so an accurate, regularly reviewed figure is the only reliable protection.
What’s included
More than walls and a roof.
Hover or tap each item for a plain‑English explanation.
- foundationThe full rebuild of the propertyRebuilding the whole structure from the ground up, foundations, walls, roof and floors, to today’s standards, not just patching up damage.
- deleteDemolition and debris removalSafely clearing and disposing of what’s left after a total loss, which has to happen before any rebuilding can begin.
- architectureProfessional and design feesThe architects, engineers and surveyors needed to design and sign off the rebuild, often 10–15% of the total cost.
- gavelBuilding‑regulation complianceMeeting current building regulations, which are usually stricter than when the property was first built.
- fenceOutbuildings and boundariesGarages, sheds, walls, fences and gates that also have to be rebuilt or replaced.
- trending_upInflation over the rebuild periodAn allowance for building costs rising while the claim is settled and the work is carried out.
UK‑wide coverage
An accurate figure, anywhere in the UK.
We establish accurate building reinstatement costs for property across the whole of the UK, from London and the South East to the Midlands, the North, Scotland, Wales and Northern Ireland.
- London
- Manchester
- Birmingham
- Leeds
- Liverpool
- Bristol
- Sheffield
- Newcastle
- Nottingham
- Leicester
- Southampton
- Brighton
- Cardiff
- Edinburgh
- Glasgow
- Belfast
Get your figure
Three ways to establish your reinstatement cost.
Desktop Assessment
A fast, remote RICS figure for standard houses, flats and commercial units anywhere in the UK.
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On‑Site Survey
A full site visit for listed, complex or high‑value buildings where detail matters.
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3‑Year Protection Plan
A full assessment plus three years of BCIS‑indexed annual updates to keep the figure current.
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Frequently Asked Questions.
Common questions about building reinstatement cost and how it is assessed.
What is a building reinstatement cost?
A building reinstatement cost is the total cost of rebuilding a property from scratch if it were destroyed, including demolition, debris removal, professional fees and compliance with current building regulations. It is not the market value or the purchase price, and it is the figure your buildings insurance sum insured should be based on.
How is a building reinstatement cost calculated?
A RICS‑regulated surveyor measures the property’s gross floor area and construction type, then applies current build‑cost rates from live BCIS (Building Cost Information Service) indices. Allowances are added for demolition, professional and design fees, outbuildings, boundaries and inflation over the rebuild period to reach a defensible total.
Is the reinstatement cost the same as the market value?
No. Market value reflects what someone would pay for the property, including the land and location. Reinstatement cost is purely the cost of rebuilding the structure. In many areas the two figures differ significantly, which is why insuring at market value usually leaves a property under‑ or over‑insured.
How often should a building reinstatement cost be reviewed?
RICS guidance is to obtain a full assessment at least every three years and to index‑link the figure annually in between. Build costs move quickly, so a figure that was accurate at the last renewal can drift materially out of date within a year or two.
What happens if my building reinstatement cost is wrong?
If the sum insured is lower than the true rebuild cost, most policies apply a “condition of average” and reduce any claim by the same proportion you are underinsured, even for a small, partial loss. An accurate RICS assessment removes that risk and gives you a figure you can stand behind at renewal.