What can invalidate your home insurance?
What can invalidate house insurance?
How to Avoid Invalidating Your House Insurance
Understanding what can invalidate house insurance is essential for every homeowner. Small mistakes or overlooked details can lead to denied claims when you need support most.
If your home incurs damage or your property is stolen, home insurance can cover you in a time of need. However, in some circumstances, your home and contents insurance policy may not cover your claim depending on certain factors. Below we will break down what situations could invalidate your house insurance.

Which circumstances invalidate home insurance?
There are several instances where your home insurance may be invalid, these include:
- Not locking your doors and windows
- Leaving your property empty or unoccupied – Leaving your home unoccupied for long periods is a key example of what can invalidate house insurance
- Undervaluing the contents of your home
- Building work or renovations
Need to check your home insurance policy?
Make sure you’re not at risk – speak to CDC Insurance today for clear guidance on how to avoid invalidated house insurance.
Call us on 01843 861251 or email us at enquiries@cdc-insurance.co.uk
Invalidate Home Insurance: Not locking your doors or windows
It’s quite common for most people to step out and accidentally overlook the locking of windows. However, it’s often vital to verify this each time you leave your property. With the majority of insurance providers, merely closing your doors and windows isn’t sufficient while you’re away. Ensuring that all doors and windows are locked is key to not invalidating your insurance policy.

Leaving your property empty or unoccupied
Going away on holiday isn’t going to invalidate your home insurance, most insurance providers take holidays into account. We advise that if you are going to be away from home for 30 days or more, you should let your insurer know.
If your home is going to be unoccupied for periods longer than 30 days, if you are relocating for work or have had to move into respite care following injury or illness for example, then ask us about Unoccupied Property insurance which will provide you with the cover you need while the home is not lived in.
Invalidate Home Insurance: Undervaluing the contents of your home
It is tempting to guess the value of the contents of your home when applying for a home insurance policy, but it could cost you a lot when it invalidates your claim.
The average house in the UK has a contents replacement value of £45,000 so it is best if you can be as accurate as you can. You should calculate the ‘as new’ cost of replacing your contents, not the current estimate based on the age or wear and tear of your items as in the event of a claim your contents will be replaced as new.

Building work or renovations
Many people across the UK are choosing to renovate their homes instead of moving, this includes improvements like extensions or loft conversions. When you carry out work on your home that could introduce new risks or increase the cost of rebuilding, you need to let your insurance provider know before work begins.
Renovations could affect your contents too. If your property has easier access for thieves such as scaffolding around the exterior, this could be cause for your policy provider to invalidate your claim if this hasn’t been declared to them in advance.
Invalidate Home Insurance: Your security measures
Upon obtaining home insurance, you’ll be queried about the property’s architecture and the security arrangements you’ve implemented. The responses you provide will determine your premium. Therefore, it’s crucial to inform your insurer if any changes occur.
Even something like changing your front door could invalidate your insurance. If your door has been replaced, the type of lock you have may have changed as well and may not be up to the same standard as declared on the policy.
10 Common Mistakes That Could Invalidate House Insurance
1. Neglecting property maintenance
Home insurance is based on a mutual understanding between you and your insurer. Failing to carry out routine upkeep, such as fixing leaks, replacing damaged roofing, or clearing gutters, ould be seen as negligence. Poor maintenance may lead to a rejected claim and can invalidate house insurance.
2. Not informing your insurer about renovations
Major changes like a loft conversion, kitchen refit, or rear extension can affect your policy. While redecorating doesn’t usually need to be reported, structural alterations should always be declared in advance to avoid complications with cover.
3. Running a business from home without declaring it
If you start operating a business from your home, beyond occasional remote working, you may require a commercial policy. Not informing your insurer could leave you without proper protection and potentially invalidate your house insurance.
4. Leaving your property unoccupied for too long
Most policies limit how long your home can be vacant, typically to 30 days. If you’re planning an extended absence, such as travelling or leaving the property between tenants, you must let your insurer know. Failing to do so could void your policy.
5. Failing to secure your home properly
If a break-in occurs and it’s discovered that doors were left unlocked or spare keys were hidden in obvious places, your claim may be denied. Installing appropriate locks and ensuring windows and doors are secure is essential.
6. Subletting without the right cover
Renting out your property, whether short-term lets or house swaps, can affect your insurance. Some insurers offer cover for this, but many require a specific landlord or holiday let policy. Unapproved subletting can invalidate house insurance.
7. Causing intentional damage
Most policies exclude deliberate damage caused by the homeowner or anyone living in the home. Attempting to claim for such damage is considered fraud and will almost certainly invalidate your cover.
8. Not being upfront about previous claims
When applying for or renewing your policy, it’s crucial to disclose any past claims. Omitting this information or being dishonest could lead to a refusal to pay out or cancellation of your policy.
9. Misrepresenting the value of your belongings
Overstating the worth of your possessions during a claim is viewed as fraud. On the flip side, undervaluing them can leave you underinsured. Accurate valuations help ensure your cover is fit for purpose and your claim runs smoothly.
10. Failing to update your policy when things change
Whether you’ve bought new tech, welcomed a new family member, or renovated your space, always update your policy accordingly. Keeping your cover in line with your lifestyle helps prevent problems that could invalidate house insurance in the future.
Summary: Top tips for making sure your house insurance doesn’t become invalid
- Be Honest: Declare all facts accurately and update the insurer on major changes; like lodgers, pets, structural work, or renovations.
- Maintain Security: Lock up properly, install approved locks and alarms, and avoid hiding keys outside.
- Look After the Home: Perform regular upkeep, fix faults promptly, and hire registered professionals for specialised jobs.
- Manage Vacancy Properly: Notify your insurer if you’ll be away for more than 30–60 days; consider unoccupied cover if empty longer.
- Claim Responsibly: Don’t inflate valuations; report incidents swiftly and correctly to both police and insurer.
- Review Regularly: At renewal time, check your policy against current usage, renovations, and possessions so it remains suitable for your needs.
Why This Matters
Invalidated claims often result in hefty out-of-pocket bills and long-term consequences; including difficulty finding insurance later.
Do you need a new home insurance policy?
Want to make sure you’re not at risk? Speak to CDC Insurance today and get clear guidance on what can invalidate house insurance—and how to avoid it
Get in touch with the CDC Team below for advice and guidance:
T: 01843 861251
Read our other articles
- Travel Insurance
- Management Liability Insurance
- Let Property Insurance
- Home Insurance
- General
- Fleet Insurance
- Construction Sector Insurance
- Car Insurance
5 Types Of Insurance Every High Street Business Should Consider
If you’re considering becoming a landlord, you’ve probably asked yourself: are rental properties worth it? The answer isn’t always straightforward, as letting out property comes with both rewards and responsibilities.
Are Rental Properties Worth It? A Guide For Landlords
If you’re considering becoming a landlord, you’ve probably asked yourself: are rental properties worth it? The answer isn’t always straightforward, as letting out property comes with both rewards and responsibilities.


