Rebuild Cost Versus Market Value for Buildings Insurance: A property can have two very different values.
One reflects what a buyer may pay for it.
The other reflects what rebuilding it could cost after serious damage.
Buildings insurance is usually concerned with the second figure.
Confusing market value with rebuild cost can lead to inaccurate cover. Therefore, homeowners should understand what each figure represents.
Rebuild Cost and Market Value
- Market value is the expected sale value of a property.
- Rebuild cost estimates the expense of reconstructing the building.
- Buildings insurance normally uses the rebuild cost.
- The rebuild cost can be lower or higher than the market value.
- Land value is not normally included in the rebuild figure.
- Professional fees and site clearance may form part of the calculation.
- Listed and unusual buildings may need specialist assessments.
- Major improvements can change the required level of cover.
- The figure should be reviewed regularly.
What Is a Property’s Market Value?
Market value is the amount a buyer may reasonably pay for a property.
It can be influenced by:
- Location
- Local demand
- School catchment areas
- Transport connections
- Plot size
- Property condition
- Number of bedrooms
- Nearby amenities
- Economic conditions
- Comparable sales
Market value includes the attraction and scarcity of the location.
Two similar houses can have different market values because they stand in different areas.
However, their reconstruction costs could be similar.
What Is the Rebuild Cost?
The rebuild cost estimates how much it could cost to reconstruct the insured building after severe damage.
It is sometimes called:
- Reinstatement value
- Rebuilding cost
- Reinstatement cost
- Buildings sum insured
The calculation is not limited to construction materials.
It may also include:
- Demolition
- Removing damaged materials
- Clearing the site
- Labour
- Building materials
- Architects’ fees
- Surveyors’ fees
- Structural engineers
- Planning costs
- Building regulation requirements
- Reconnecting services
- VAT where applicable
The exact policy basis should be checked.
Why Is Market Value Not Used?
Buildings insurance protects the structure rather than the land or location.
The ground usually remains after an insured event.
Therefore, the policy does not generally need to replace the land’s market value.
A home worth £600,000 does not automatically cost £600,000 to rebuild.
Likewise, a remote or unusually constructed home could cost more to rebuild than its market value.
Market price and reconstruction cost answer different questions.
Market value asks: What might someone pay to own this property?
Rebuild cost asks: What might it cost to reconstruct the insured building?
Can the Rebuild Cost Be Higher Than the Market Value?
Yes.
This may happen where a property:
- Has non-standard construction
- Uses specialist materials
- Is listed
- Has protected architectural features
- Is difficult to access
- Requires specialist trades
- Has extensive outbuildings
- Must comply with complex planning conditions
- Stands in an area with lower property prices
A modest market price does not always mean a low reconstruction cost.
Can the Rebuild Cost Be Lower Than the Market Value?
Yes.
Properties in expensive areas may have market values greatly influenced by land and location.
A standard home in a high-demand area could have a market value above its rebuild estimate.
This is one reason the purchase price should not be copied into an insurance application without checking.
Where Can You Find the Rebuild Cost?
A rebuild estimate may appear in:
- A mortgage valuation
- A homebuyer report
- A building survey
- A previous insurance schedule
- A professional reinstatement assessment
- An insurer’s calculation
Check when the figure was prepared.
An old assessment may not reflect current building costs, alterations or professional fees.
The mortgage valuation should also be read carefully. Some reports may not provide a detailed reinstatement assessment.
What Can Change the Rebuild Cost?
The required amount can change over time.
Relevant changes may include:
- Building an extension
- Converting a loft
- Converting a garage
- Adding an outbuilding
- Installing a new fitted kitchen
- Adding specialist bathrooms
- Changing the roof
- Creating a basement
- Installing solar panels
- Adding permanent accessibility features
- Changing construction materials
- Inflation in labour and materials
Tell the insurer about significant changes before work begins.
Large building projects can create risks that ordinary home insurance does not cover.
Why Can Renovations Affect Buildings Insurance?
Renovations can affect both the property’s value and the insurer’s risk.
Building work may involve:
- Exposed structures
- Temporary roofing
- Open walls
- Contractors on site
- Unoccupied rooms
- Disabled security systems
- Stored building materials
- Structural alterations
A standard policy may restrict or exclude some building work.
You may need confirmation from the insurer or specialist renovation cover.
The finished improvements may also increase the rebuild cost.
Our guide to remortgaging for home improvements explains the wider borrowing considerations when financing property work.
What Is Underinsurance?
Underinsurance occurs when the insured amount is lower than the value that should have been declared.
This can leave a shortfall following a claim.
Some policies contain an average clause. This can allow an insurer to reduce a claim proportionately when the property is underinsured.
For example, suppose a building should be insured for £400,000. However, the declared figure is only £300,000.
The home would be insured for 75% of the required amount.
Depending on the policy, an eligible claim could also be reduced to reflect that percentage.
The actual treatment depends on the insurer’s terms and the circumstances.
What Is Overinsurance?
Overinsurance means selecting a sum above the realistic reconstruction cost.
It does not normally mean that the insurer will pay the entire insured amount after a claim.
Insurance is generally intended to place the policyholder back in the insured position, subject to the policy terms.
A higher figure may also produce a higher premium without providing a matching benefit.
The objective is not the largest possible number. It is an accurate and supportable estimate.
What Are Bedroom-Rated Policies?
Some buildings policies do not ask the customer to set a precise rebuild amount.
Instead, the insurer may offer a standard maximum limit based on the property’s number of bedrooms.
This can reduce the risk of an incorrect manual estimate.
However, the maximum limit should still be checked.
A standard limit may not suit:
- Listed buildings
- Large properties
- Thatched homes
- Non-standard construction
- Properties with extensive outbuildings
- Homes containing specialist architectural features
The application questions must still be answered accurately.
What About Leasehold Properties?
The freeholder, landlord or managing agent often arranges buildings insurance for the entire block.
The insured value is usually calculated for the whole structure rather than one flat.
Leaseholders should check:
- The block’s total buildings sum insured
- How often the value is assessed
- Whether professional fees are included
- The policy excess
- Whether improvements inside the flat are covered
- How claims are reported
- Whether alternative accommodation is included
Do not rely solely on the service-charge amount. It does not explain the complete policy.
Does Contents Insurance Use Rebuild Cost?
No.
Contents insurance normally uses the replacement value of the belongings covered by the policy.
These may include:
- Furniture
- Clothing
- Appliances
- Technology
- Jewellery
- Carpets
- Curtains
- Freestanding kitchen equipment
- Personal possessions
Contents should generally be valued according to the policy’s replacement basis.
This is separate from the cost of rebuilding the property.
Connect Mortgages provides a wider explanation of these distinctions in its Buildings and Contents Insurance guide.
How Often Should the Rebuild Figure Be Reviewed?
Review the figure:
- At each renewal
- After major building work
- After purchasing an extension
- Following a loft or garage conversion
- When an older assessment appears inaccurate
- After substantial changes in construction costs
- When buying a listed property
- When the insurer requests a new assessment
Some policies include index linking. This may adjust the insured amount in response to construction-cost changes.
However, index linking does not correct an inaccurate starting figure.
Flood Risk and Rebuild Costs
Flood risk does not directly determine the rebuild estimate. However, it may affect policy terms, premium and availability.
Homeowners in England can use the official GOV.UK long-term flood-risk service.
The service provides information about an area’s risk from rivers, the sea, surface water, reservoirs and groundwater.
It does not predict whether an individual building will flood.
Tell the insurer about previous flooding and answer all risk questions accurately.
When Might a Professional Assessment Be Appropriate?
A professional reinstatement assessment may be useful where:
- The property is listed
- Construction is unusual
- The previous figure is old
- The property is very large
- Specialist finishes are present
- Access is difficult
- Several outbuildings exist
- Major alterations have taken place
- The insurer requests an assessment
A suitably qualified surveyor can examine the building and prepare a more detailed estimate.
Rebuild Cost Checklist
Before accepting a buildings insurance figure, check:
- Does it exclude the land value?
- Does it include the main house?
- Are garages and outbuildings included?
- Are permanent fixtures covered?
- Are demolition and clearance included?
- Are professional fees included?
- Does it reflect current construction?
- Have recent improvements been considered?
- Is the property listed or unusual?
- Is the assessment recent?
- Does the insurer use a fixed maximum limit?
- Does index linking apply?
Keep records supporting the figure.
These may help when reviewing the policy or making a claim.
Accurate Cover Begins With the Right Measure
Market value describes ownership in the property market.
Rebuild cost describes the potential task of reconstruction.
The two values can move differently because they measure different things.
Therefore, buildings cover should not be selected from the purchase price alone.
Check the survey, understand the policy basis and review the amount after significant property changes.
For a wider explanation of home cover, visit our buildings and contents insurance page.
Frequently Asked Questions
Is rebuild cost the same as market value?
No. Market value reflects what a buyer may pay. Rebuild cost estimates the expense of reconstructing the insured building.
Is the mortgage balance the correct insurance amount?
Not necessarily. The mortgage balance does not calculate demolition, labour, materials or professional rebuilding costs.
Can I use the figure from an old survey?
It may provide a starting point. However, check its date and whether the property has changed since the assessment.
Does the rebuild value include land?
The land value is not normally included because the land usually remains after damage.
Will my insurer automatically increase the amount?
Some policies use index linking. However, this may not correct an inaccurate original figure or reflect undeclared alterations.
Should extensions be reported to the insurer?
Yes. An extension can change both the rebuild value and the property’s risk during construction.
