Buying a new build in Cardiff? Whether you're in Pontprennau, St Mellons, Pentwyn, Trowbridge or any of the other growing new-build estates across the city, one question comes up more and more: “Should I add solar panels to my new home?”
The short answer is almost always yes — but the timing matters. Here's everything Cardiff new-build homeowners need to know in 2025.
Why New Builds Are Ideal for Solar
When Should You Install Solar on a New Cardiff Build?
The most cost-effective time to install solar on a new build is within the first 1–3 years of moving in. There are three main options:
Some Cardiff developers — particularly on larger estates — offer solar panels as a standard or optional extra when you buy. If your developer offers this, the cost is typically lower than retrofitting. However, developer solar is often undersized (2–3kW) and may not include battery storage. Ask GL Solar to review any developer solar proposal before committing.
If your developer doesn't include solar, you can arrange installation after exchange of contracts but before your move-in date. The advantage is starting to generate from day one. You'll need the developer's permission for roof access, and we manage this process for Cardiff new-build clients.
The most common approach — install solar in your first year or two. The roof is still in pristine condition, the installation is clean and efficient, and you start saving immediately. There's no benefit to waiting beyond the first couple of years.
The Future Homes Standard & Cardiff New Builds
Wales introduced new building regulations in 2022 requiring new homes to produce 75% less carbon than older builds. From 2025, the Future Homes Standard tightens this further, with many Welsh new-build developers now including solar panels, air source heat pumps or high-performance insulation as standard to meet compliance.
If your new Cardiff home doesn't include solar as standard under the Future Homes Standard, it likely includes other low-carbon technology instead. Adding solar is still an excellent investment in these homes — particularly if combined with the battery storage and EV charging infrastructure that many new Cardiff buyers are requesting.
New Build Solar Stats for Cardiff
Get a Free Quote for Your New Cardiff Build
GL Solar installs solar panels on new builds across all Cardiff postcode areas — Pontprennau, St Mellons, Trowbridge, Pentwyn, Llanishen and more. Free survey within 48 hours, full MCS certification, 0% VAT.