Best Solar Design Software UK: 2026 Guide

The solar design software UK installers can rely on must do more than draw panels on a roof. The 2026 UK solar market is shaped by the Smart Export Guarantee, the MCS certification scheme, BS 7671 18th Edition Amendment 3, and G98 or G99 grid connection rules. Residential installs have climbed past 240,000 a year, ECO4 and the Great British Insulation Scheme are pushing more low income homes onto solar plus battery, and commercial rooftop is accelerating on warehouses and schools. Most popular design platforms were built for the United States and miss these UK specifics. This guide compares the leading options and shows how SurgePV handles UK workflows from site capture to signed proposal.

What UK Installers Need

A UK design workflow is different from a US one in five concrete ways.

BS 7671 18th Edition Amendment 3. The current wiring regulations include updated guidance for solar PV systems, surge protective devices, and arc fault detection where appropriate. A platform that prompts string voltage limits, isolation requirements, and DC cable derating against BS 7671 saves hours of cross referencing.

G98 and G99 grid connection. Any inverter connected to a UK Distribution Network Operator needs either a G98 notification for small single phase systems or a G99 application for larger or three phase systems. The DNO expects a clear single line diagram, inverter protection settings, and export capacity figures.

MCS scheme certification. The Microgeneration Certification Scheme is the route to consumer protection and to most domestic incentive eligibility. MCS umbrella schemes need installer numbers, datasheet references, generation estimates, and standard consumer code wording.

SEG and legacy FiT tariffs. The Smart Export Guarantee replaced the Feed in Tariff for new installs in 2020. Licensed suppliers publish export rates that range from around 3p to 15p per kWh. Designers need to model export income against self consumption assumptions, often with a battery in the loop.

ECO4 and Great British Insulation Scheme. Many domestic solar installs in 2026 are being bundled with insulation work under ECO4 obligations. Software that can carry mixed measures and produce a clear homeowner proposal supports retrofit one stop shops.

US-first tools rarely cover all five.

Why US-First Tools Underperform in the UK

Aurora Solar is the dominant US design platform. The engineering is strong and the AI design tools are mature. However, Aurora ships NEC code defaults, US utility rate plans, and proposal templates focused on net metering and PPA financing. UK users have to override most of those defaults and rebuild SEG logic in spreadsheets. Aurora has no native BS 7671 references and no MCS proposal template.

HelioScope is the engineer favourite for utility scale yield analysis. The shading model and SAM based yield engine are credible. HelioScope is a pure engineering tool, with no proposal output, no UK tariff modelling, and no contact management. A UK installer needs at least three more pieces of software around it to close a deal.

OpenSolar has more UK presence than the others. It is free at entry level, which appeals to smaller installers. The trade off is that OpenSolar relies on advertising and partner referrals for revenue, the bankable yield reporting is shallow compared to dedicated tools, and the code library does not match a BS 7671 first workflow. For an installer who wants premium proposals and an audit trail for finance partners, OpenSolar can feel thin.

Solargraf comes from the Enphase ecosystem and is biased toward US microinverter projects.

The result is that UK installers stitch together design, proposal, and compliance work across three or four tools and a folder of spreadsheets.

How SurgePV Handles UK Workflows

SurgePV is a cloud platform built to compress that stack into one workspace. The relevant features for the UK are these.

AI 3D from satellite. AI 3D roof modeling builds a metric accurate model of a pitched or flat roof from a postcode lookup. There is no drone flight or LIDAR purchase required for most domestic jobs.

Module-level shading. Every plan ships an 8,760-hour shade analysis that models obstruction losses on every panel for every hour of the year. Dormers, chimneys, parapets, and neighbouring rooftops are all considered.

BS 7671 code library. The single line diagram view references BS 7671 18th Edition Amendment 3 alongside the IET Code of Practice for grid connected PV. Designers see string voltage and cable derating prompts as they configure the system.

SEG tariff and yield reporting. The financial engine produces a bankable yield report with P50, P75, and P90 scenarios. Designers enter the homeowner SEG export rate and self consumption assumption, and SurgePV outputs year by year income alongside payback and IRR.

Branded MCS-ready proposals. A branded solar proposal carries MCS installer numbers, datasheets, generation forecast, CO2 saving, and standard wording. Proposals are available in nine languages, useful for installers serving multilingual customers across Greater London, the Midlands, and Scotland.

Clara AI. Clara AI acts as a design assistant, suggesting layouts and answering questions about regulation references in natural language.

Designed for independent contractors. SurgePV is shaped as solar design software for installers rather than for finance platforms or hardware OEMs, so the workflow stays focused on getting a UK installer from enquiry to signature quickly. Sister platform QuickEstimate handles fast lead capture for the same teams.

Solar Design Software for UK Comparison Table

The table is intentionally focused on UK relevant capability, not raw feature count.

UK Pricing for Solar Installers

SurgePV pricing is published in US dollars and billed annually. Converted at recent rates the headline figures look like this.

• Individual plan. $1,899 per user per year, roughly £1,500. Full feature set including BS 7671 library, SEG modelling, AI 3D, Clara AI, and bankable yield reports.
• 3-User Team plan. $1,499 per seat per year, roughly £1,180. Shared panel and inverter libraries, shared client list.
• 5-User Team plan. $1,299 per seat per year, roughly £1,025. Best value for a growing installer with a design team and field surveyors.

Aurora Solar in 2026 lands between £1,500 and £2,450 per seat per year depending on the tier required to unlock AI 3D and shading. HelioScope is around £1,500 per seat per year and only covers the engineering layer. OpenSolar starts free, however the paid tier needed for premium proposal and CRM features moves the cost toward £600 per seat. Solargraf is quoted on request and is usually bundled with hardware commitments.

For a five person UK installer, the difference between SurgePV at £5,125 a year and Aurora at £10,000 a year is enough to fund another field surveyor or a small van. The full solar design software pricing comparison breaks down the same math for every platform on the market.

Real Workflow: 4 kW Residential Project With SEG Income Calculation

The full sequence takes a trained UK designer about twenty five minutes. The same job in a stack of US-first software and spreadsheets typically takes a morning.

The customer-facing half of this decision, meaning proposal generation, financing presentation and e-signature, is covered in our best solar proposal software UK comparison.

Design is one layer. For how simulation, proposal, compliance and CRM fit around it, see the full solar software stack for the UK.

Who Should Choose Each Tool for UK Solar Design

• Independent UK installers doing both domestic and light commercial. SurgePV is the best fit. Single price, BS 7671 and SEG built in, branded MCS-ready proposals.
• Engineering consultancies on utility scale UK projects. HelioScope alongside SurgePV is reasonable. HelioScope for deep yield analytics, SurgePV for proposal and compliance pack.
• Large national installers already invested in Aurora. SurgePV is worth piloting on a UK regional team to compare seat cost and SEG workflow against Aurora overrides.
• Brand new installer with very limited budget. OpenSolar free tier covers basic design, then move to SurgePV once volume justifies premium proposals.
• Solargraf users locked to a hardware ecosystem. Migration to SurgePV opens up multi brand inverter and panel selection.