Considering solar panels for a property? The installation process and considerations differ significantly depending on whether you're incorporating them into a new build or retrofitting onto an existing structure. While both approaches lead to sustainable energy generation, installing solar during the construction phase offers unique advantages.
Advantage 1: Seamless Integration
New Build: Integrating solar panels during construction allows for optimal placement and aesthetic integration. Wiring can be hidden within walls, mounting systems can be incorporated into the roof structure before tiling, and options like Building Integrated Photovoltaics (BIPV) – solar tiles or slates – become feasible, offering a sleek, unobtrusive look. The system can be designed holistically with the house's architecture.
Retrofit: Installation involves working around the existing structure. Wiring often needs to be run externally or through existing conduits, potentially impacting aesthetics. Mounting systems are installed on top of the existing roof covering. While BIPV is possible in retrofits, it's usually more complex and costly than during new construction.
Advantage 2: Cost Efficiency
New Build: Significant cost savings can be achieved. Scaffolding erected for general construction can be utilised for solar installation, saving on separate access costs. Roofing and electrical work can be coordinated, reducing labour time. Integrating solar costs into the overall build mortgage can also offer favourable financing compared to separate solar loans.
Retrofit: Separate scaffolding is often required, adding a substantial cost. Installation requires careful work around existing roofing and electrical systems, which can sometimes be more time-consuming. Financing is typically handled through separate loans or upfront payment.
Advantage 3: Design Optimisation
New Build: Architects and builders can design the roof specifically for solar from the start – optimising pitch, orientation, and minimising shading from vents or chimneys to maximise energy generation potential. Structural considerations for the weight of the panels can be factored into the initial roof design.
Retrofit: Installers must work with the existing roof's characteristics. While experienced installers can optimise placement on existing roofs, they are constrained by the pre-existing orientation, pitch, and potential shading issues. A structural survey may be needed to ensure the roof can handle the additional load.
"Planning for solar during the design phase of a new build unlocks potential for cost savings and system optimisation that simply isn't possible with retrofitting."
Considerations for Both
Regardless of the approach, some factors remain constant:
- System Sizing: Accurately estimating energy needs is crucial for both new and existing homes.
- Component Quality: Choosing high-quality panels, inverters, and mounting systems is vital for longevity and performance.
- Installer Expertise: Using certified and experienced installers (like us!) is paramount for a safe and effective installation.
- Permissions: While new builds integrate this into broader planning, retrofits might require specific planning permissions depending on the property and location (though many installations fall under permitted development).
Conclusion
While retrofitting solar panels is an excellent way to make existing homes more sustainable, integrating solar during new construction offers distinct advantages in terms of cost, aesthetics, and potential for system optimisation. By planning for solar from day one, developers and self-builders can ensure their properties are energy-efficient, cost-effective to run, and future-proofed from the moment the keys are handed over.