Is Your Home Suitable for Solar Panels?

Roof Condition

Solar panels are designed to stay on your roof for 25–30 years, so your roof needs to be in solid condition before installation. That doesn't mean it needs to be brand new — but if you're expecting to re-roof within the next decade, it's better to do that first. Factoring in the full cost of a solar installation means accounting for any roof repairs upfront.

Your installer will check for:

• Broken or missing slates or tiles
• Signs of sagging, rot, or damp in the roof structure
• Adequate felt and flashing condition
• General structural integrity of the timber rafters

Structural Requirements

A common concern is weight. Each solar panel weighs approximately 20 kg, plus the mounting rails add a few kilograms per panel. For a typical 10-panel system, that's roughly 220–250 kg spread across a large section of roof.

For context, this is significantly less than the weight of a standard concrete roof tile per square metre. The vast majority of Irish houses — whether built in the 1970s or the 2020s — can support solar panels without any structural modifications.

Situations where extra checks are needed:

• Older cottages with non-standard roof construction
• Roofs with visible sagging or compromised timbers
• Flat roof conversions or extensions with lightweight structures

If there's any doubt, your installer can arrange a structural engineer's assessment. This is rare — most homes sail through.

Roof Orientation and Shade

Orientation is one of the biggest factors in how much electricity your panels will generate. Here's how different roof directions compare:

Shade matters too. Trees, chimneys, neighbouring buildings, or dormer windows that cast shadows across your roof for a significant part of the day will reduce output. A few hours of partial shade in the morning or late afternoon is normal and manageable — heavy shade across the middle of the day is a problem. See our guide to solar output across the seasons for more on how orientation and shade affect generation.

Scaffolding and Access

Installers need safe access to your roof, which almost always means scaffolding. This is a standard part of every itemised quote (typically €300–€600), but a few things can make access more complicated or expensive:

• Conservatories, extensions, or lean-tos blocking access below the installation side
• Narrow side passages between semi-detached houses
• Steep or uneven ground around the property
• Third-storey or attic-conversion roofs requiring taller scaffolding

None of these are deal-breakers — they just affect the scaffolding cost and logistics. Your installer will assess access during the site survey.

Electrical Panel Capacity

Your home's electrical distribution board (fuse board) needs a spare circuit for the solar inverter connection. Most modern consumer units have room, but older boards — particularly those with rewireable fuses — may need an upgrade.

A Registered Electrical Contractor (REC) will check this as part of the installation process. If an upgrade is needed, it's typically included in the quote. In some cases, this might be flagged as a separate cost of €200–€500, but it's relatively uncommon.

If your home has already had electrical work done recently (heat pump, EV charger, extension), your board is very likely in good shape. Adding a solar battery later may require additional capacity, so it's worth mentioning your future plans during the site survey.

Planning Permission

Since the 2022 rule changes, most Irish homes are exempt from planning permission for rooftop solar panels. The exemption conditions are straightforward:

• Panels must not project more than 15 cm from the roof surface
• Panels must not exceed 50% of the roof area on any single slope
• Panels must not extend above the highest point of the roof

Standard flush-mounted panel installations meet all three conditions easily. Your installer will provide an exemption compliance letter that confirms the installation meets planning rules — useful for future property sales.

Quick Suitability Checklist

Run through these quickly. If you can tick most of them, your home is very likely a good candidate for solar:

• Roof in good condition — no major repairs needed in the next 10 years
• South, east, or west-facing roof (or a combination)
• Minimal heavy shading during the middle of the day
• Reasonable scaffolding access to the installation side
• Home built and occupied before 2021 (for the SEAI grant)
• Electricity bill high enough to justify the investment (typically €1,200+/year) — try our savings calculator

If you're unsure about any of these, don't worry — a site survey from a qualified installer will give you a definitive answer. And it's free with any reputable company.

Find Out for Certain

The quickest way to know if your home is suitable is to speak with a qualified installer. Our team of advisors can connect you with a trusted SEAI-registered professional who'll carry out a free site survey and give you a straight answer.