What nobody tells you about insurance and house value when you fit solar panels

Panels are a buildings improvement, even if nobody calls them that

A home policy covers two worlds: the buildings element, which is the structure and everything permanently fixed to it, and the contents, which is what sits inside and would move house with you. Panels anchored to the roof, with their mounting structure, wiring and inverter, form part of the buildings element just like a kitchen refit or a glazed terrace: they are an improvement that raises the insured value of the building.

If you do not notify the insurer, the buildings sum insured declared on the policy falls short of what actually needs protecting. The industry has a name for that: underinsurance. And it has a consequence: after a loss, the adjuster can apply the average clause and the insurer may pay out only part of the damage, in the same proportion by which the house was underinsured. It is an avoidable upset, and one phone call avoids it.

How to notify your insurer: one call and very little paperwork

The process is simple. You call or write to your broker or insurer, explain that a rooftop self-consumption photovoltaic system has been installed, and ask for it to be recorded on the policy as a buildings improvement, updating the sum insured. Most companies handle it with a policy endorsement.

Ask for written confirmation and keep that endorsement together with the rest of the installation's documentation. The day it is needed, having the paper to hand saves arguments.

• The date the installation was commissioned.
• The cost of the installation, with its invoice.
• Installed power and a basic description: rooftop panels, inverter and protections.
• Confirmation that it is anchored to the building, not ground-mounted.
• A copy of the electrical installation certificate if the company asks for it.

Will my premium go up much?

It is the first question everyone asks, and the honest answer is qualitative: in practice, it rarely adds anything worth mentioning. The capital a domestic installation adds is small compared with the total value of a home, and insurers are used to taking it on as just another improvement to the building.

What matters is not that adjustment but its opposite: the cost of not making it. An installation that does not appear on the policy is an installation that, come a claim, sits in no man's land. If the premium ever moved more than seems reasonable at annual renewal, you can always compare other companies, with the installation declared from day one.

Who covers what: insurer, manufacturer and statutory guarantee

Three distinct layers of protection sit around an installation, and mixing them up is a source of misunderstandings. Each one answers for different things, and to different parties.

An example makes the split clear: if a hailstorm cracks a panel's glass, that is a matter for the home insurance. If a panel loses performance abnormally because of a factory defect, the manufacturer answers under its warranty terms. And if the inverter fails a year after commissioning, or a workmanship defect appears, the statutory conformity guarantee obliges the company that sold and installed the system to put it right.

• Home insurance: sudden external damage to the installation as part of the buildings element: hail, wind, lightning, fire or theft of wiring, according to the cover taken out.
• Manufacturer's warranty: product defects and abnormal performance loss, on each brand's written terms.
• Statutory conformity guarantee: 3 years against the company that sells and installs, covering both original defects and workmanship faults.

Hail, wind and lightning: what actually happens in this comarca

Anyone living between Xàtiva and Navarrés knows the summer script: late-afternoon storms, the occasional hailstorm and spells of strong westerly wind. Photovoltaic modules are tested against impact and against wind and snow loads, and a properly calculated mounting structure is sized for the specific site, not with generic values. Local experience says hail capable of damaging a panel is an infrequent event, but it does exist, and that is precisely what the policy is for.

With lightning, the usual risk is not a direct strike, which is rare, but the power surge that travels along the grid after a storm. That is where the installation's own protections work first and, as a second line, the electrical damage cover on the home policy. It is worth checking that this cover is in place and with what limits, because not all policies include it in the same way.

If it is not legalised, the claim gets complicated

After a loss, the adjuster asks for papers: the electrical installation certificate, proof of self-consumption registration, the responsible declaration filed with the town hall. An installation that has not been legalised opens the door to arguments over whether the damage is covered, drags out the claim, and leaves the owner in a weak position at exactly the moment they need the opposite. Legalisation is not administrative decoration: it is the difference between claiming with papers and claiming with words.

Those same papers are also the gateway to everything else: to surplus compensation with your supplier and to the deductions available to those who meet the requirements, such as the state income tax deduction of 40% on a base of up to 7,500 euros (RDL 2/2026, until 31-12-2026, with before and after energy certificates registered within the deadline) and the Valencian regional deduction of 40% on a base of 8,800 euros, conditional on self-consumption registration and the IVACE certificate. A complete file is not empty bureaucracy: it is money, and it is peace of mind.

What panels do for your house's value

A house with self-consumption costs less to run every month, and a buyer understands that instantly. On a typical domestic bill, grid tolls and charges account for around 40% of the total: the share of energy you produce at home stops being paid in full to the supplier, and the bill you show when selling is simply lower. Add to that the energy performance certificate, which improves its rating with the installation, and which is a document every buyer will see without fail.

We are not going to give you a revaluation percentage, because it depends on each house, each street and each moment of the market, and any specific figure would be an invention. What can be said is this: between two identical houses in Canals or Ontinyent, the one with a legalised installation, live warranties and lower running costs holds its ground in a negotiation better than the one with none of that. The value is in the paperwork and the bill, not in the brochure.

The day you sell: the papers that pass to the buyer

The installation transfers with the house, and its documentation should travel with it. Handing over a tidy file builds trust, avoids last-minute discounts in the negotiation, and lets the buyer carry on using the surplus compensation and the warranties without starting from scratch.

The buyer thus inherits an installation with a history and proper follow-up, not an unknown bolted to the roof. And the seller closes the deal with no loose ends, which is the best way to close any deal.

• The electrical installation certificate and the project or technical report.
• Proof of self-consumption registration.
• The responsible declaration or works licence filed with the town hall.
• Invoices and manufacturer warranties for panels, inverter and mounting structure.
• The surplus compensation contract, for the change of ownership.
• Access to the monitoring platform and the equipment manuals.

Frequently asked questions