Solar Panels and Insurance: What UK Homeowners Need to Declare
Why Your Solar Installation Is an Insurance Matter
When James Whitmore installed 12 panels on his semi-detached house in Warwickshire, he assumed the work was finished once the MCS-certified installer packed up their van.
What he overlooked was a single phone call to his home insurer.
Six months later, a fallen branch cracked three panels during a storm.
His insurer rejected the claim because the installation had never been declared.
The panels were uninsured, and the damage was his to bear alone.
James's situation is far from unique.
Research from the Association of British Insurers suggests that a significant proportion of UK households with solar installations have not adequately updated their home insurance policies.
This is not a niche concern.
With the Smart Export Guarantee creating new financial relationships between households and energy companies, and battery storage systems becoming increasingly common, the insurance landscape for UK solar owners has grown considerably more complex.
This guide sets out exactly what UK homeowners need to declare, why it matters financially, and how to ensure your installation is properly covered without paying over the odds.
Understanding What Insurers Actually Need to Know
Home insurance policies in the UK are designed around the concept of risk.
When you install solar panels, you are altering the structure of your property and introducing equipment that affects both the building itself and the liability profile of your home.
Insurers need to assess several factors that did not exist before your installation.
Declared Equipment and Its Value
Your insurer needs to know that solar panels are present, what type they are, and their approximate value.
This sounds straightforward, but many homeowners are surprised to learn that solar equipment is not automatically covered under standard buildings insurance.
The panels are a permanent fixture that forms part of the structure of your home, which means they should be included in your buildings sum insured.
However, the inverter, battery storage unit, and mounting hardware often fall under different categories.
Key figure: The average domestic solar PV system in the UK costs between £5,000 and £10,000 fully installed, depending on system size and equipment quality.
This value needs to be added to your buildings sum insured to ensure adequate coverage.
You should also consider the cost of reinstallation.
If your panels are damaged and need to be removed before roof repairs can be carried out, some policies do not automatically cover the cost of refitting.
Always check whether your policy includes an allowance for specialist removal and reinstallation of solar equipment.
The MCS Certification Factor
MCS (Microgeneration Certification Scheme) certification is not merely a quality badge for your installation.
Insurers increasingly view it as a risk indicator.
An MCS-certified installation demonstrates that your system has been fitted by a qualified professional to recognised standards, that the equipment meets specific performance criteria, and that the installation complies with relevant electrical safety requirements.
Many insurers offer preferential terms or fewer exclusions for MCS-certified installations.
When you are comparing home insurance quotes, specifying that your installation is MCS-certified can directly affect the premium you are quoted.
You will need your MCS certificate number to declare this, which should have been provided by your installer on completion.
Pro Tip: Keep your MCS certificate and installation documentation in a secure digital location (cloud storage or a dedicated folder).
You will need this reference when changing insurers, making claims, or if you ever sell your property.
Estate agents increasingly ask for evidence of installation certification during conveyancing.
What Specifically Must Be Declared
The declaration requirements can be broken down into several distinct categories.
Getting these right from the outset prevents problems when you come to make a claim.
- System size and output: Declare the rated capacity in kilowatts peak (kWp).
A typical domestic installation ranges from 3kWp to 6kWp.
- Panel type and manufacturer: Monocrystalline, polycrystalline, or thin-film.
Insurers may have views on specific manufacturers based on replacement availability in the UK.
- Installation date: This establishes when the risk was introduced and affects whether retrospective cover applies.
- Installation company and certification: Name of the MCS-certified installer and their certification number.
- Battery storage units: If you have a home battery system such as a Tesla Powerwall, LG Chem, or similar, this must be declared separately as it represents an additional electrical system.
- Inverter type and location: Whether your inverter is string-based or microinverters, and whether it is housed indoors or in a garage.
- Export arrangement: Under the Smart Export Guarantee, you will have a formal export agreement with an energy supplier.
Your insurer may ask about this.
- Planning permission status: Whether the installation required planning permission (most domestic rooftop installations do not, but listed buildings and conservation areas are different).
Important distinction: Failing to declare solar panels is not simply an administrative oversight.
In the event of a claim, an insurer may treat non-declaration as a material fact omission, which can give them grounds to void the policy entirely.
This means you would have no cover at all.
The Role of DNO Approval and G99 Forms
For most domestic solar installations up to 3.68kWp (single-phase) or 11.04kWp (three-phase), the installation can proceed under what is known as an "exception" to the G99 engineering requirements, which your MCS-certified installer will typically handle as part of the standard process.
Larger systems, or those with battery storage that can export power in certain conditions, require formal DNO (Distribution Network Operator) approval via a G99 application.
While this is primarily an electrical safety matter, insurers may ask whether your installation received formal DNO sign-off.
For systems requiring G99 approval, the additional scrutiny from your regional DNO provides an extra layer of documentation that demonstrates the installation meets required standards.
This documentation is worth keeping alongside your MCS certificate.
"I didn't realise that my 6kW system with battery storage actually required DNO notification.
My installer handled it, but when my insurer asked for evidence of approval, I had to go back and find the correspondence.
It would have been far easier to file it all together from the start." — Case study shared on the Solar Trade Association community forum, 2023
Battery Storage: The Overlooked Declaration
Home battery storage systems are increasingly common in UK solar installations, particularly as households seek to maximise self-consumption and take advantage of variable electricity tariffs.
However, batteries introduce specific insurance considerations that many homeowners overlook.
Lithium-ion battery systems carry inherent fire risk, though the probability remains low with properly certified equipment.
Insurers will want to know the capacity of your battery in kilowatt-hours (kWh), the manufacturer, and whether it has been installed by an MCS-certified installer.
Some insurers have specific questions about whether the battery is housed within the property or in an outbuilding, as external installations may attract different terms.
Current market data: According to the Energy Savings Trust, a typical home battery storage system in the UK costs between £3,000 and £8,000 installed.
This figure should be added separately to your home contents insurance as a high-value item, not simply included within your general contents sum.
You should also check whether your battery manufacturer or installer offers their own warranty-backed insurance product.
Some manufacturers provide extended warranty coverage that includes replacement and reinstallation costs, which can supplement but not replace your home insurance declaration.
How Grants and Schemes Interact With Insurance
Several UK government schemes affect the financial and legal context of your solar installation, and understanding these helps you make more informed insurance decisions.
Smart Export Guarantee (SEG)
The Smart Export Guarantee, introduced in 2020, requires larger energy suppliers to pay households for electricity exported to the grid.
This creates a formal financial relationship between you and your energy supplier, and some insurers ask about export arrangements when assessing risk.
A home that generates and exports significant amounts of electricity represents a different profile from one with a small, self-consumption-only system.
ECO4 and the Boiler Upgrade Scheme
The Energy Company Obligation (ECO4) scheme focuses primarily on insulation and heating improvements for fuel-poor and low-income households, while the Boiler Upgrade Scheme provides grants for heat pumps.
While these schemes do not directly cover solar PV installations, homeowners who have received ECO4 measures may have a different energy profile that affects how insurers assess their property.
Similarly, households combining solar with a heat pump installation under the Boiler Upgrade Scheme should declare both systems together, as the electrical load profile of the property will have changed significantly.
VAT Rates on Solar Equipment
Solar panels and associated equipment are currently zero-rated for VAT under the government's energy-saving materials relief.
This affects the declared value of your installation for insurance purposes.
When calculating the sum insured, use the VAT-exclusive price you actually paid, not a retail price that includes VAT.
Your installer should have provided a VAT-compliant invoice that makes this distinction clear.
Premium Impacts: What to Realistically Expect
Adding a solar installation to your home insurance policy will typically increase your premium, but the increase is often modest compared to the total cost of the system.
The exact impact depends on several factors that vary between insurers.
| Installation Type | Typical Insurer Response | Potential Premium Impact |
|---|---|---|
| Rooftop panels, up to 4kWp, MCS-certified | Generally accepted with declaration | Small increase, typically £20–£60/year |
| Panels with battery storage, up to 10kWh | Requires explicit declaration | Moderate increase, £50–£120/year |
| Ground-mounted system | Higher scrutiny; may require specialist cover | Variable; often requires separate policy add-on |
| Non-MCS-certified installation | Many mainstream insurers will not cover | May require specialist or trade insurer |
| Listed building or conservation area installation | Planning confirmation required | Additional admin; premium varies |
These figures are indicative.
The best approach is to get buildings and contents quotes from at least three insurers, specifically mentioning your solar installation, and compare the total premium impact against the declared value of the equipment.
Some insurers offer multi-product discounts if you combine buildings and contents insurance with the same provider.
Pro Tip: When you receive your annual insurance renewal quote, treat it as an opportunity to review your sum insured.
If energy costs have led to increased labour and material costs for roof repairs, or if battery storage prices have risen, your declared equipment value may need upward adjustment.
An underinsured solar installation is just as problematic as an underinsured building.
Real-World Scenarios UK Homeowners Face
Scenario 1: The Storm Damage Claim
A hail storm damages eight panels on a 4kWp system in Sheffield.
The homeowner has declared the installation but has not separately itemised it in the buildings sum insured.
The insurer agrees to cover the panels but calculates the replacement cost based on an average figure that is lower than the actual installed cost, including fitting.
The homeowner faces a shortfall of £1,200.
This scenario is entirely avoidable by ensuring the declared value reflects actual installed cost, not just equipment purchase price.
Scenario 2: The Battery Fire
A lithium battery storage unit develops a fault that results in a small electrical fire in a utility room in Bristol.
The homeowner has declared the solar panels but not the battery.
The insurer accepts the fire damage to the room under buildings insurance but refuses to cover the battery replacement or the damage the fire caused to adjacent panels.
The homeowner contests the decision, arguing the panels were declared.
The insurer's position is that the undisclosed battery was the cause of the incident, making the overall risk profile misrepresented.
Scenario 3: Selling With Solar
A family in Cambridge sells their home eight years after installation.
The property has a legacy Feed-in Tariff arrangement that predates the Smart Export Guarantee.
The buyer surveyor notes the panels but cannot find evidence of adequate insurance or certification.
This delays the sale and requires the seller to produce documentation retroactively.
By keeping a dedicated file from day one, this situation never arises.
Legacy Feed-in Tariff Installations
For homeowners with solar installations that date from the original Feed-in Tariff scheme (which closed to new applicants in March 2019), there are specific record-keeping considerations.
These installations have been generating payments for over a decade in many cases, and the equipment will be aging.
Insurers assessing a property with a legacy FIT installation will want to know the installation date, current condition, and whether any major components such as inverters have been replaced since the original installation.
If you have replaced your inverter (a common maintenance requirement around the 10-year mark for many string inverter systems), this represents a material change that should be declared to your insurer.
A new inverter is a significant electrical addition to your system and can affect both the risk profile and the declared value of your installation.
Planning Permission and EPC Ratings
Most domestic rooftop solar installations in England do not require planning permission under permitted development rights.
However, this changes in specific circumstances: listed buildings, properties in conservation areas, and installations on flat roofs with certain height or positioning criteria may require formal planning consent from your local authority.
Your insurer may ask whether planning permission was required and obtained.
For installations that did require permission, evidence of approval should be filed with your installation documentation.
An unpermitted installation where permission was required could affect both your insurance validity and your ability to sell the property, as conveyancers routinely check planning compliance.
The installation of solar panels also affects your property's Energy Performance Certificate rating.
A well-designed system that reduces electricity bills and carbon emissions can improve your EPC score, which is increasingly relevant for insurers assessing the overall condition and efficiency of a property.
Keep a copy of your post-installation EPC certificate, as this demonstrates the tangible benefit of the installation to future buyers and insurers alike.
A Practical Framework: Your Declaration Checklist
Before you contact your insurer, gather the following information.
Having this to hand makes the declaration process straightforward and ensures nothing is missed.
- MCS certificate and installer details
- Total system capacity in kWp
- Equipment make, model, and serial numbers where available
- Installation date and address of the property
- Invoice showing total installed cost (VAT-exclusive)
- Battery storage capacity in kWh, if applicable
- Inverter type and location
- Smart Export Guarantee supplier name and agreement reference
- Evidence of DNO notification or G99 approval if applicable
- Planning permission reference if required
- EPC certificate before and after installation if available
Action step: Contact your insurer within 14 days of installation completion.
Most insurers allow a grace period for declaration of new installations, but it is far better to declare proactively than to discover a gap in coverage when you need to make a claim.
Common Mistakes and How to Avoid Them
The most frequent errors UK homeowners make are predictable and, more importantly, avoidable with a small amount of systematic attention.
Assuming standard cover is sufficient. Many homeowners read "your home and its fixtures" in a policy summary and assume panels are covered.
They are not, automatically.
Declaration is always required.
Declaring panels but not batteries. Battery storage is frequently treated as a separate item by insurers.
Failing to declare it creates a gap that an insurer can exploit when processing a related claim.
Undervaluing the installation. Setting the declared value at equipment purchase price alone ignores the significant cost of installation labour, scaffolding, electrical work, and commissioning.
Insurers calculate cover on replacement cost, which includes all of these elements.
Not updating the policy after inverter replacement. A new inverter is a material change to your electrical system.
Treat it as a new installation for declaration purposes.
Forgetting to re-declare after switching insurer. Every time you change home insurance provider, you must declare the solar installation afresh.
Do not assume your previous insurer's knowledge transfers automatically.
The Bottom Line
Installing solar panels on your UK home is a sound financial decision that will generate electricity savings for 25 years or more.
Protecting that investment properly takes less than an hour of administrative effort and costs a modest increase in your annual premium.
The cost of getting it wrong — a rejected claim, a voided policy, or a shortfall on a damage settlement — far exceeds the effort of doing it right.
Start with your MCS certificate and your installation invoice.
Call your current insurer with those documents to hand.
Ask specifically what they need to declare the system as adequately covered under your buildings sum insured, and whether battery storage needs a separate declaration.
Get the answer in writing.
File everything together, and review it annually at renewal.
That systematic approach is what separates homeowners who are properly covered from those who discover a gap only when they need help most.