Solar Panels During a Renovation in Ireland: What to Do and When

Solar panels fit naturally into a renovation or extension in Ireland, and the cheapest time to plan them is before the roof work starts. If scaffolding is already up and the roof covering is being replaced, adding panels costs less in labour and avoids a second access set-up. The grants work the same way as any other installation: you need SEAI approval before work begins, so the application has to come early, not after the builder has started.

How Does Solar Fit Into an Irish Renovation?

A renovation usually touches the roof, the wiring, the hot press or utility room, and sometimes the driveway. Those are exactly the four places a solar system needs.

• The roof takes the panels, and its age and condition decide whether to re-cover before or after.
• The utility room or garage takes the inverter and, often, the battery.
• The distribution board takes the solar circuit and the charger circuit.
• The driveway or side wall takes the EV charger, if you are adding one.

Getting those decisions into the drawings and the builder's programme is the difference between a tidy install and a retrofit of a retrofit.

Why Should You Plan Solar Before the Roof Work Starts?

Roof access is the single biggest variable in installation cost. A standard residential install takes one to two days once the crew is on site, but scaffolding, safe access and making good around mounts are a large part of the job. If a re-roof is already happening, the marginal cost of adding solar falls.

There is also a technical reason. Panels need a sound, watertight roof beneath them, and mounting rails are fixed to the structure, not just the slates. Putting panels on a roof that is 20 years old means paying for removal and refitting when the roof is eventually replaced. If your renovation includes a new roof covering, the sequence should be roof first, solar second, same scaffold.

The SEAI solar PV grant has one rule that catches people out: you must have grant approval in place before works start, and applications are not accepted for installations already begun. A builder starting a full renovation does not invalidate a solar application on its own, but any solar work started before approval does.

What Grants and VAT Apply in 2026?

At the time of writing October 2026, the supports are:

• Solar PV grant of €700 per kWp up to 2 kWp, then €200 for each additional kWp up to 4 kWp, capped at €1,800.
• Home battery grant of €600 for a battery of 5 kWh or more, which can be claimed with solar in one application or separately later.
• Enhanced grants for homeowners on qualifying Department of Social Protection payments, up to €8,400 for solar and €9,000 with a battery.
• 0% VAT on residential solar PV supply and installation, and on a battery installed at the same time.

The VAT point is worth real money. Before 1 May 2023 the rate was 13.5%, so a 5 kWp system at 0% saves roughly €900 to €1,000 compared with the old rate. A standalone battery installed without solar carries 23% VAT, which is one reason to consider the battery during the renovation rather than years later.

*Figures correct as of October 2026. Grant amounts and VAT treatment are subject to change.*

What Order Should the Work Happen In?

The sequence below works for most Irish renovations, whether the job is a rear extension, an attic conversion or a full retrofit.

*Sequence is a guide only. Your installer and builder will set the actual programme.*

Two details are easy to miss. Your installer must submit the ESB Networks connection form before installation, and that process takes at least four weeks or 20 working days, so it belongs in the programme alongside the builder's dates. And SEAI requires a post-works BER certificate where solar PV is installed, which is simpler to arrange while the assessor can still access the house before the family moves back in.

How Do You Future-Proof for a Battery and an EV Charger?

A renovation is the moment to put in the things that are awkward to add later.

• Run a duct from the distribution board to the parking spot, even if the charger comes in two years.
• Leave space beside the inverter for a battery, with ventilation and a frost-free location.
• Size the solar array for the car you expect, not just today's bill. A 5 kWp system covers most homes and a modest EV mileage.
• Ask for a hybrid inverter if a battery is likely, rather than a string inverter that has to be replaced to add one.
• Keep the EV charger on its own circuit with the right protection, which is cheaper to do during first fix.

WattCharger's solar panel installation service covers the survey, design, grant paperwork and ESB Networks notification, so the solar dates can be agreed with your builder rather than bolted on afterwards.

What Can Go Wrong?

Most renovation solar problems come from timing rather than technology.

• Solar ordered after the roof is finished, so the scaffold comes back for a second time.
• Grant application lodged after the panels are on the roof, which makes the works ineligible.
• A battery specified for a utility room that is later converted, leaving no space.
• An EV charger added at the end, with the cable surface-mounted across a new driveway.
• A BER assessment booked too late, holding up the grant payment.

None of these are expensive to avoid at design stage. All of them are expensive to fix.

Is Solar Worth Adding to a Renovation?

For most Irish homes, yes, especially when the roof is already being worked on. A 5 kWp system typically costs around €6,000 after the grant, and a battery adds roughly €3,500 to €5,500 installed. The system produces for 25 years or more, and the grant is claimed once.

The renovation itself also improves the payback in a less obvious way. Better insulation and a heat pump or an EV increase how much of your own generation you use, and self-consumed units are worth about €0.35 each against about €0.18 to €0.20 for exported units. A well-insulated, all-electric home gets more from the same panels.

Final Thoughts

Solar and a renovation are a natural pairing, but only if the solar is planned before the roof and the wiring are closed up. Apply for grant approval first, put the connection form and the BER in the builder's programme, and decide the battery and charger locations while the walls are still open. Done in that order, the solar is the cheap part of the job. Done late, it is the expensive part.

Ready to Plan Solar Around Your Build?

Send us your drawings or your builder's programme and we will tell you what the roof can take, where the battery and inverter should go, and what grant value you can claim. Book a free consultation with WattCharger and get the solar decision settled before the scaffold goes up. Start with our solar panel page, or read our guide to the SEAI grants if you want the amounts first.