Residential solar in South Wales
A typical 4 kWp rooftop system in Swansea generates around 3,800 kWh per year based on the 950 kWh/kWp yield for SA postcodes. At 30p/kWh grid import and a blended self-consumption of 40%, the in-bill saving sits at roughly £460 per year, with an additional £230 from Smart Export Guarantee payments at 15p for the 2,280 kWh exported.
Residential solar pricing
- Installed cost: £7,500 to £9,500 — includes panels and inverter, fully installed and commissioned
- Battery storage: separate add-on, typically £3,500 to £4,500 for a 5 kWh unit (priced on survey)
- Payback period: approximately 4.5 years on current grid import rates and SEG export tariffs
Request a fixed-price residential solar quote
What is included
- Structural roof survey and pre-install inspection
- Scaffolding and all safety works
- SolarEdge string inverter with panel-level optimisers
- Trina Vertex or JA Solar DeepBlue panels
- DC and AC isolation, surge protection, earthing upgrades if needed
- G98 DNO notification and MCS certification
- SEG application support for your chosen supplier
- Monitoring app setup and full handover pack
Standards
- BS 7671 18th Edition Amendment 2
- MCS 3002:2025 product and installation requirements
- IET Code of Practice for Electrical Energy Storage Systems
- Part P Building Regulations
Smart Export Guarantee
SEG rates in 2025-26 sit at around 3 to 7p/kWh on open tariffs and 15 to 25p/kWh on tied tariffs where you use the supplier for both import and export. Octopus Outgoing, British Gas Export and Earn Plus and E.ON Next Export Exclusive currently lead on tied rates. We help you compare live rates at commissioning.
Our process
- 1Site survey
A named FLD engineer visits your site, measures the roof or installation zone, inspects the incoming supply and verifies load, structural integrity and orientation. For commercial sites we run a full discovery including half-hourly consumption data where available.
- 2Design and proposal
We produce a scaled layout, generation model using PVGIS data, financial model with simple and post-tax payback, DNO G99 or G98 notification pack where relevant, and a fixed-price quotation. Every proposal names the exact panels, inverters and mounting system.
- 3DNO and planning
We handle NGED G99 Type A applications for commercial systems, G98 notifications for domestic, and any permitted development confirmation or full planning submissions required for listed buildings or conservation areas.
- 4Install and commission
FLD directly-employed engineers install under a single NICEIC Approved Contractor sign-off. Commissioning includes BS 7671 testing, SolarEdge monitoring portal setup, MCS certification where applicable, and handover of all documentation.
- 5Aftercare
Insurance-backed NICEIC warranty, 25-to-30-year panel performance warranty from the tier-1 manufacturer, 12-year SolarEdge inverter warranty, and ongoing O and M support including remote performance monitoring.
152 kW Parc Dewi Sant NHS, Carmarthen — FLD installation
Recent FLD installation — view all project photos
Standards we work to
- BS 7671
- MCS 3002:2025
- Part P
- G98
- IET CoP for EES
Equipment and components
- SolarEdge
- Trina Vertex
- JA Solar