UK insurers paid out £1.2 billion in weather-related property claims in 2025, and the average flood payout to a homeowner came to £30,000. For someone with solar panels, a heat pump, or a straw-bale extension, the question isn’t just whether you’re insured — it’s whether your policy actually covers the things that make your home greener.
Disclosure: Some links on this page are affiliate links. If you make a purchase through them, Britwealth may earn a commission at no extra cost to you. We only include products and services that are relevant to the topic.
This article is general information only and does not constitute professional advice. For your specific situation, consult a qualified professional.
Standard home insurance policies weren’t written with green upgrades in mind. Solar panels, heat pumps, and battery storage systems each change the rebuild cost of a property and introduce new risks a standard policy might not cover. The research shows that specialist and ethical insurers are often a better fit for eco homes — and the price difference is smaller than many people assume. Here’s what you actually need to know.
Key Takeaways and What “Buildings Insurance” Covers for Eco Homes
If you own or are building an eco home, the first distinction to understand is between buildings insurance and contents insurance. Buildings insurance covers the structure — walls, roof, floors, fitted fixtures, and permanent installations like solar panels that are fixed to the roof. Contents insurance covers your belongings. Most eco upgrades count as part of the building, so they fall under buildings cover. But the moment you install something that changes the rebuild cost or introduces a new risk (like battery storage), your existing policy may no longer be valid unless you’ve told your insurer.
What I tend to notice is that people install green technology with the best intentions but treat insurance as an afterthought. My first move would always be to check whether the insurer even accepts non-standard construction before getting a quote, not after installation.
What Eco Upgrades Actually Cost to Insure — Premiums and Rebuild Values
Every eco upgrade changes two numbers: the annual premium you pay and the rebuild cost your insurer uses to calculate cover. The table below shows the typical range based on provider data.
→ Scroll right to see all columns
| Eco Upgrade | Annual Premium Impact | Rebuild Cost Increase |
|---|---|---|
| Solar PV panels | £25 – £65 (+3%–8%) | 5% – 15% |
| Air-source heat pump | £10 – £80 | 2% – 5% |
| Ground-source heat pump | Not separately specified | 8% – 12% |
| Battery storage (over 5 kWh) | May be excluded from contents | 3% – 8% |
| Double / triple glazing | Minimal | 1% – 3% |
| Loft insulation | None | 0% – 1% |
For context, the average UK home insurance premium sits between £200 and £400 a year. Adding solar panels at the top end of the range (£65) pushes that to roughly £265–£465 — a manageable increase compared with the risk of a claim being denied because the upgrade was never declared. What matters most is whether the installer is MCS-certified: insurers may offer smaller premium increases for certified installations.
That 10% figure means that for every £300 you pay in premiums, £30 goes directly to environmental projects. It’s not a discount — it’s a redirect. If aligning your spending with your values matters, that’s a concrete number to weigh against a cheaper standard policy that may not cover your heat pump at all.
Mistakes That Leave Green Homeowners Underinsured
Assuming standard cover includes solar panels and heat pumps
A standard buildings policy typically covers the structure — but “structure” is defined differently by different insurers. Some treat solar panels as fixtures (covered), others as “improvements” that need separate endorsement. The research shows that specialist insurers like Naturesave cover solar panels and biomass boilers as standard, while many high-street providers require a specific add-on. The practical step: ask your insurer directly whether each installed system is covered under the buildings sum, and get the answer in writing.
Not updating the rebuild cost after installing green technology
Solar PV can add 5% to 15% to the rebuild cost of a property. Ground-source heat pumps add 8% to 12%. If your buildings insurance is based on the pre-upgrade rebuild value, you’re underinsured by thousands of pounds. After a total loss, the insurer pays out based on the rebuild cost you declared — not the actual cost. The fix: recalculate your rebuild cost using the BCIS rebuild calculator or ask your insurer to reassess after each upgrade.
Leaving a property unoccupied for more than 30 days without telling the insurer
Eco homes under construction, or empty while you wait for a heat pump installation, can trigger a policy exclusion. Most standard policies cap unoccupied periods at 30 to 60 days. If you’re building a self-build eco home and the site is unoccupied for weeks, a standard policy may not pay out for theft, vandalism, or storm damage during that period. Specialist builders’ insurance or unoccupied property insurance is needed — and it must be arranged before the unoccupied period begins.
Choosing the cheapest policy without checking exclusions on green features
A budget policy might save £50 a year but exclude cover for “non-standard construction” or “alternative energy systems.” If your heat pump or biomass boiler fails or is damaged, you’re paying the full replacement cost. The research shows that ethical insurers like Ecclesiastical (a Which? Best Buy) and Arma Karma (which donates 25% of its share of revenue to charity) are competitively priced while explicitly covering eco features. Comparing policies on coverage details rather than price alone is the only way to avoid this gap.
How to Get the Right Cover for Your Eco Home
Step 1: Notify your insurer before installation begins
Tell your insurer in writing what you’re planning to install, with what materials, and who is doing the installation. Keep a copy of the notification and a confirmation reply. If the installer is MCS-certified, mention that — it can reduce the premium increase. For ground-mounted solar panels, ask whether they need separate buildings or contents cover.
Step 2: Choose a provider that understands eco homes
Not all insurers are built the same. Naturesave, ETA (via a partnership model), Ecclesiastical, and Arma Karma all have track records with eco and non-standard properties. Naturesave covers straw bale, hempcrete, and self-build homes as standard. ETA lets you offset the carbon impact of your policy for a small monthly fee. Ecclesiastical has donated over £200 million to charities and holds a Which? Best Buy rating for buildings and contents. The premium difference between these and a standard provider is often narrower than expected — especially once you factor in what a standard policy might exclude.
Step 3: Check the policy covers flood, storm, and subsidence explicitly
With weather-related claims at £1.2 billion in 2025, flood and storm cover are no longer optional extras for most UK homes. The Flood Re scheme helps keep premiums affordable for homes built before 2009 in flood-risk areas. But if your eco home is in a flood zone and your policy doesn’t include flood cover, you’re self-insuring against a £30,000 average claim. Verify that flood, storm, and subsidence are listed as covered perils in the policy wording — not just assumed.
Future-proofing: what to watch for in 2026 and beyond
The Financial Conduct Authority’s pricing reforms now prevent insurers from charging loyal customers more than new customers for equivalent cover. That makes annual policy reviews genuinely useful. On the horizon: more insurers are expected to introduce specific “green home” policies with bundled cover for solar, battery storage, and heat pumps, as adoption of these technologies rises. If you’re planning a major retrofit, check whether your current provider plans to offer a dedicated green product before switching — you may be able to negotiate a better deal by staying.
Frequently Asked Questions About Eco Home Insurance
Do I need to tell my insurer about loft insulation? ▾
What if my battery storage is over 5 kWh? ▾
Is ethical home insurance more expensive? ▾
Does Flood Re cover eco homes? ▾
What happens if I don’t notify my insurer about solar panels? ▾
Can I insure a straw-bale home with a standard insurer? ▾
Where the Insurance Industry Is Heading on Green Homes
The £1.2 billion in weather-related claims is not a one-off. Insurers are repricing flood and storm risk every year, and homes with certified green upgrades are increasingly seen as lower-risk — better insulated, more resilient, and less prone to certain types of damage. Specialist providers are already ahead of the curve, but the big shift will come when standard insurers start offering dedicated green-home policies as a mainstream product. Until then, the responsibility sits with the homeowner: notify in writing, check the rebuild cost, and choose a provider that treats your eco features as assets, not exceptions.
Remember: this article is general information only. For advice on your specific situation, speak to a qualified professional.
If this was useful, you might also want to read Is Your UK Property Insurance Actually Protecting You From These Hidden Risks?.
Sources and Further Reading
Understanding Property Maintenance Insurance for UK Homes — A closer look at how maintenance obligations interact with your insurance cover, including what happens when wear and tear is mistaken for damage.
Hidden Property Traps That Can Void Your Insurance — Common policy pitfalls every homeowner should know, from unoccupied periods to undisclosed renovations.
Good With Money (2026). Top 4 Ethical and Eco Home Insurers. 🔗
Axiom Eco Homes (2026). Eco Upgrades Home Insurance Impact. 🔗
WS Insurance (2026). The Complete Guide to Home Insurance in the UK. 🔗
The London Report (2026). Home Insurance UK. 🔗
