14 MAY 2026 
6 MIN READ
Why is an accurate rebuild cost important for landlords?
As a landlord in the UK, having an accurate estimate of your property’s rebuild costs is essential for ensuring you have the right level of insurance coverage. This helps protect your property investment in case of damage or disaster.
What is underinsurance?
Underinsurance is when the rebuilding sum insured that you’ve selected is not adequate to rebuild your property following a total loss.
What happens if your property is underinsured?
If something should go wrong, and your building is a complete loss, your insurer will only pay out to the limit of the cover you’ve selected. If it’s a partial loss; the insurer will pay out a reduced amount in line with the amount of your underinsured cover.
For more information on how underinsurance can impact you, read our full underinsurance guide here.
What is a ‘Rebuild Cost Assessment’?
A Rebuild Cost Assessment estimates how much it would cost to rebuild your property from scratch if needed. It helps to ensure your coverage matches the actual rebuilding costs, helping you to avoid being underinsured.
You can use online rebuild cost calculators to help work out estimated costs based on the information you provide.
Please note, while these calculators provide cost as guide, it’s best practice to have your rebuilding sum insured reviewed by a chartered surveyor, periodically.
What is included in a Rebuild Cost Assessment?
Demolition and site clearance:
The costs associated with safely clearing the site.
Rebuilding costs:
The cost of materials, labour, plant, and equipment needed to rebuild the property.
Property specifics:
Details such as the size of the property, whether it’s a listed building, structural considerations and their related costs.
Professional fees:
Expenses for legal, architectural, and engineering services needed for planning, with approvals from the relevant authorities.
Additional costs:
Expenses to meet current regulations and standards, such as accessibility requirements, flood prevention measures, or new building codes.
How often should you reassess your rebuild costs?
There’s no fixed timeline. What works for you depends on your individual property and circumstances.
However, it’s recommended you review and update your rebuild costs intermittently. If you’ve made renovations or significant changes, update your costs immediately to keep everything accurate.
Most property insurers include index linking, which helps account for rising prices over time and ensures your coverage remains accurate. Nonetheless, it’s still recommended that you periodically review your rebuild costs. If there have been significant property changes, such as renovations or upgrades, it’s important to factor these in when reviewing your rebuild costs.
Why is it important to update your costs?
Keeping your costs accurate and up to date ensures, in the event of an incident, you have the right cover in place and don’t incur unexpected costs. Your property is a valuable investment, so having the right level of coverage is essential.
Common mistakes to avoid
Confusing market value with rebuild costs
The old saying, ‘Location, location, location,’ certainly applies here, as the location of your property will have a significant impact on its market value.” However, many landlords mistakenly assume the market value of their property reflects rebuild costs. This isn’t necessarily true, as market value depends on how attractive the property is to buyers, which doesn’t always match the actual cost to rebuild.
Relying on outdated valuations
Neglecting to update costs after making changes or improvements to your property is another common mistake that can lead to inaccurate rebuild costs. Whether you’re adding an extension or upgrading your kitchen or bathroom, these changes can have a significant impact on the overall costs to rebuild.
Underestimating the impact of inflation
It’s essential to review your rebuild costs regularly to account for inflation. Over time, the prices of building materials, labour, and other costs can increase unexpectedly or fluctuate due to market conditions. If your estimates don’t keep pace with these changes, your insurance might not fully cover the cost of rebuilding, leaving you underinsured. Regularly reviewing your rebuild sum insure to ensure it remains accurate.
Protecting your property
Your property is a valuable investment. Having the right coverage can help cover unexpected costs and provide peace of mind. That’s why it’s important to keep your rebuild costs accurate, so your insurance can help protect what matters most.