Solar Panels for New Build Homes in Cardiff

If you are building a new home in Cardiff or buying a new build property, installing solar panels from day one is one of the smartest decisions you can make. Not only does it future-proof your home against rising energy costs, but it is also increasingly required by building regulations.

Building Regulations and Part L Compliance

Under the updated Part L building regulations, new homes in Wales must demonstrate a 31% reduction in carbon emissions compared to previous standards. Solar panels are one of the most cost-effective ways to achieve this. Many Cardiff developers are now including solar as standard on new builds, but the quality and sizing of these systems varies significantly.

If you are a self-builder or working with a smaller developer, you have more control over the solar system specification. We recommend sizing the system based on your anticipated energy usage rather than just meeting the minimum regulatory requirement. A properly sized system will save you far more money over the lifetime of the home.

Why Install Solar During Construction?

Cost Savings:Installing solar during construction is typically 10–20% cheaper than retrofitting. Scaffolding is already in place, roof access is easier, and electrical infrastructure can be designed around the solar system from the start.

Aesthetics:Integrated solar panels (built into the roof rather than mounted on top) create a sleek, modern look that many new build buyers prefer. We can advise on in-roof vs on-roof systems for your specific design.

Future-Proofing:New builds in Cardiff are designed to last 60+ years. Installing solar from day one means you benefit from decades of savings. Adding battery storage and EV charging infrastructure during construction is even more cost-effective.

Higher Property Value:Energy Performance Certificate (EPC) ratings significantly affect property values. A new build with solar typically achieves an A or B rating, making it more attractive to buyers and potentially commanding a premium price.

Smart Home Integration:New builds can incorporate smart energy management systems from the outset. We can integrate solar generation data with your home automation system, optimising when appliances run and when batteries charge.

What Size System for a New Build in Cardiff?

The ideal system size depends on your home's floor area, expected occupancy and energy usage. For a typical 3–4 bedroom new build in Cardiff, we recommend:

3-bedroom semi-detached: 3.5–4kW solar system. Estimated generation: 3,000–3,500 kWh/year. Annual savings: £600–£900.

4-bedroom detached: 5–6kW solar system + 5–10kWh battery. Estimated generation: 4,500–5,500 kWh/year. Annual savings: £1,000–£1,500.

5-bedroom+ or large detached: 6–8kW solar system + 10kWh+ battery. Estimated generation: 5,500–7,500 kWh/year. Annual savings: £1,200–£2,000.

All estimates include SEG export income and assume 50–70% self-consumption with battery storage.

New Build Developments in Cardiff We Work With

GL Solar works with developers and self-builders across Cardiff's new build developments, including Pontprennau, St Mellons, Creigiau, and the growing number of infill sites across the city. We can install on:

Standard pitched roof new builds (tile, slate or synthetic slate)

Flat roof modern designs with specialist mounting systems

In-roof integrated solar (flush with roofline)

Homes with dormers, Velux windows and complex roof shapes

Apartment blocks with shared roof space and individual metering

Planning a New Build in Cardiff?

Speak to GL Solar early in your project. We can advise on roof design, electrical infrastructure and system sizing to ensure your new home is optimised for solar from the ground up.

Call 07908 472187 Get a Free Quote