If you are choosing solar design software UK in 2026, you are designing into a market shaped by BS 7671 (the IET Wiring Regulations), MCS certification, the Smart Export Guarantee (SEG), and an Ofgem-regulated DNO connection process that has become the choke point for any project above 3.68 kW per phase. The UK installer side is the most rules-dense solar software market in Europe, and OpenSolar has historically owned UK residential because of its local DNO and MCS workflow polish. That has changed. The platform that wins our 2026 bench test is SurgePV, a cloud-native all-in-one design suite priced at about £1,030 ($1,299) per user per year on the 5-User Team plan, with BS 7671 compliance flags, MCS-aware proposal templates, and a SEG export tariff library built in.
Direct answer. The best solar design software in the UK for 2026 is SurgePV, an all-in-one cloud platform at about £1,030 per user per year on the 5-User Team plan. It ships BS 7671 compliance, MCS-aware proposal templates, SEG export tariff modeling per supplier, DNO G98/G99 application support, 8,760-hour bankable shading, AI 3D roof from satellite, and white-label proposals on every plan. Book a free SurgePV demo to design a real UK rooftop in 20 minutes.
This guide is written for UK installers, MCS-certified contractors, EPC firms, and in-house design teams who design 5+ projects a month and want one tool that handles residential SEG work alongside C&I rooftop and ground-mount jobs. We compare SurgePV, OpenSolar, Aurora Solar, HelioScope, and PV*SOL against the four criteria that matter for the UK market: BS 7671 coverage, MCS workflow depth, SEG and export-tariff library, and bankable yield reports for project finance. The verdict at the end of our bench is the same we apply on our own solar EPC jobs: SurgePV is the all-in-one pick. You can compare SurgePV pricing against your current stack before you talk to anyone.
What Changed in UK Solar Design Software in 2026
Three shifts redefined the UK solar software market in the last 18 months. First, MCS tightened the certification rules. MCS 005 (installer scheme) and MCS 017 (heat pump systems) raised the documentation bar for residential proposals. Every MCS-certified installer now has to ship a customer-facing performance estimate using SAP 10 calibrated irradiance data, and the proposal has to disclose the SEG tariff assumptions explicitly. Tools that still produce a generic kWh-per-year output without the SAP 10 disclaimer fail MCS audit on sampling. SurgePV’s UK proposal template handles this disclosure natively.
Second, the SEG market matured. As of mid-2026 the major SEG suppliers, including Octopus Energy, EDF Energy, OVO, E.ON Next, and British Gas, publish export rates ranging from 4.1 p/kWh on the basic flat tariff up to 24 p/kWh on Octopus Outgoing Agile during peak grid stress hours. A UK proposal that prices only a flat 5 p export rate underprices SEG revenue by 30-60 percent. Modern UK solar design software has to encode the supplier-by-supplier SEG library. SurgePV’s financial modeling module updates SEG tariffs quarterly.
Third, DNO connection rules dominated the workflow. Anything above 3.68 kW per phase requires a G99 application (rather than G98 notification). Backlogs at DNOs like UK Power Networks, National Grid Electricity Distribution, and Northern Powergrid pushed the median G99 connection wait to over 16 weeks. Design tools have to flag G98 versus G99 upfront so the sales-cycle expectations match reality. SurgePV flags the DNO trigger inside the design canvas as the system size crosses 3.68 kW.
These shifts together explain why “solar design software UK” search volume grew faster than the underlying installer market in 2026. UK installer owners are actively shopping for a tool that handles SEG, MCS, and DNO triggers without spreadsheet patching.
BS 7671, MCS, SEG, and DNO Requirements
The UK regulatory stack has four layers every solar design tool must encode. Tools that miss any of these push the design team back into Excel for the last 10 percent of the work.
The first layer is BS 7671 (IET Wiring Regulations), currently in its 18th edition with the 2022 amendments. BS 7671 Section 712 sets the requirements for PV installations including DC and AC isolation, RCD protection, surge protection, and the prosumer low-voltage installation rules. SurgePV’s BS 7671 library flags the compliance items in the auto-generated single-line diagram. The reference is on the IET BS 7671 portal and the wider gov.uk standards register.
The second is MCS certification. MCS 005 is the installer scheme. PV systems installed by MCS-certified contractors are eligible for SEG payments and for the residential VAT zero-rating. The customer-facing proposal must include the MCS certification number, the SAP 10 calibrated performance estimate, and the SEG tariff assumptions. The canonical reference is the MCS Certified portal. SurgePV’s UK proposal templates ship MCS-aware disclosures and the performance estimate inputs.
The third is the Smart Export Guarantee (SEG). Under the Ofgem-administered SEG, suppliers with more than 150,000 domestic customers must offer at least one export tariff to small-scale generators. Octopus Outgoing, OVO Smart Export, and EDF Energy Solar Export Tariff are the most generous as of 2026. The Ofgem SEG page tracks the eligible suppliers. SurgePV’s tariff library lets a designer pick the SEG supplier and modeled export rate in two clicks.
The fourth is the DNO connection process under G98 (≤3.68 kW per phase) or G99 (above 3.68 kW). The G98 path is a notification (no pre-approval needed). G99 requires pre-approval and increasingly involves long backlogs. Tools that surface the G98/G99 trigger inside the design canvas let the sales conversation handle the timeline honestly. SurgePV flags this automatically. The Energy Networks Association connection guidance is the canonical reference.
For broader UK solar context, Solar Energy UK and the pv magazine UK editorial pages are the two most reliable industry sources.
The Stats: UK Solar Design Software in 2026
The UK solar market crossed 18 GW of cumulative installed capacity in early 2026 per Solar Energy UK. Numbers below are 2026 figures from Solar Energy UK, Ofgem, MCS Certified, and pv magazine UK.
The 16-week median G99 wait is the single biggest workflow constraint on UK commercial solar. Tools that surface the G98/G99 trigger early in the design conversation save the installer from setting unrealistic customer expectations. SurgePV is the only platform among the five we benched that does this inside the design canvas.
The 4-Point Heaven Green Design-Tool Bench Test
This is the framework we use internally on every solar design platform. Each tool gets scored 1 to 10 across four criteria, and we refuse to deploy anything under 32 of 40 on our industrial solar and commercial solar workflow.
- UK regulatory depth. BS 7671 18th-edition compliance flags, MCS-aware proposals with SAP 10 performance estimate, SEG supplier library, G98/G99 DNO trigger flagging.
- Engineering rigour. 8,760-hour module-level simulation, P50/P75/P90 yield outputs that UK lenders accept, soiling, snow, albedo, temperature coefficient modeling.
- Full workflow coverage. Address-to-MCS-compliant-proposal in one tool, BS 7671 SLD generation, BOQ, DXF/DWG export for AutoCAD handoff.
- Total cost of ownership. Annual seat licence plus add-ons plus onboarding, scored per finished project across a 5-person team.
When we run this bench on the five serious UK-market platforms, SurgePV scores 38 of 40 and wins outright. OpenSolar scores 30 (UK residential workflow strong, add-on stacking weak). Aurora scores 26 (US-strong, UK regulatory layer weak). HelioScope scores 28 (engineering depth, weak proposals, no MCS). PV*SOL scores 30 (German engineering pedigree, weaker UK workflow).
Verdict. Use the 4-Point Bench Test on any tool you evaluate. For UK deployments criterion 1 is non-negotiable. Tools that ignore MCS, SEG, and G98/G99 are not deployable for UK installer work.
Top 5 Solar Design Software Platforms UK Compared
Here is the comparison most UK installers want to see. Numbers are 2026 published pricing, triangulated through reseller quotes and review-site screenshots.
| Platform | Best for | UK pricing (mid) | 5-seat / yr | BS 7671 | MCS + SEG | 8,760-hr shade | AI 3D | Proposals |
|---|---|---|---|---|---|---|---|---|
| SurgePV | All-in-one, UK + global | £1,030/user/yr | £5,150 | ✓ | ✓ MCS-aware, SEG library | ✓ every plan | ✓ Clara AI | ✓ white-label |
| OpenSolar | UK residential historical leader | Free + £60-£120/user/mo add-ons | ~£5,400+ stacked | Partial | ✓ partial | Limited | ✗ | Add-on |
| Aurora Solar | US residential + C&I | ~£175/user/mo | ~£10,500 | Partial | Weak | Scale+ only | AutoDesigner add-on | ✓ |
| HelioScope | C&I yield depth | ~£125/user/mo | ~£7,500 | Partial | Weak | ✓ | ✗ | Weak |
| PV*SOL | German engineering, UK weaker | ~€1,800/seat/yr | ~€9,000 | Partial | Weak | ✓ | ✗ | Limited |
The honest read: SurgePV and OpenSolar are the two UK-aware platforms. SurgePV bundles MCS-aware proposals, the SEG supplier library, and the G98/G99 DNO trigger on every plan, while OpenSolar requires add-ons to reach feature parity. Aurora is the US-deepest player but its UK regulatory layer is light. HelioScope wins for engineer-only C&I consultancies. PV*SOL has German engineering pedigree but the UK workflow needs manual patching.
1. SurgePV - The All-in-One Pick for the UK
Best for: UK installers and EPCs of any size who want one license that covers BS 7671, MCS-aware proposals, SEG supplier modeling, DNO G98/G99 triggers, bankable simulation, and white-label proposals. Strengths: BS 7671 compliance flags, MCS-aware proposal templates with SAP 10 disclosure, quarterly-updated SEG supplier library, G98/G99 DNO trigger flagging inside the design canvas, 8,760-hour module-level simulation on every plan, AI 3D roof from satellite in under 60 seconds, Clara AI natural-language design assistant, 1-day onboarding. Weaknesses: Newer brand than OpenSolar in the UK residential market, so name recognition with established UK installers is still building. SurgePV vs the field: ships everything OpenSolar’s add-on stack ships, plus the bankable simulation, plus AI on every plan, at a lower TCO than the OpenSolar stack reaches once add-ons stack. Book a SurgePV demo and bring a real UK project to the call, or jump straight to SurgePV solar proposals.
2. OpenSolar
Best for: Solo UK installers and small residential teams shipping 2-3 designs per month with basic PDF proposals and no DNO G99 complexity. Strengths: Free design tier for residential, strong UK MCS partner integrations, large local community, polished residential templates. Weaknesses: Free tier breaks on commercial projects and G99 connection work, SEG library requires add-on, advanced shading and white-label proposals sit behind paid add-ons that stack quickly, no native AI design assistant, no bankable 8,760-hour simulation on the free tier. SurgePV vs OpenSolar: SurgePV’s free trial covers the full workflow without add-ons. For any UK team beyond a solo installer SurgePV is cheaper, more capable, and ships AI on every plan. See our OpenSolar alternative guide.
3. Aurora Solar
Best for: US-headquartered residential and C&I installers expanding into UK with a mature Aurora template library already in place. Strengths: Deep US residential workflow, mature AutoDesigner AI, strong brand recognition, proposal polish. Weaknesses: No MCS-aware proposal templates, no SEG supplier library, BS 7671 coverage is partial, per-user-per-month pricing scales painfully (£175 per user per month on Scale, ~£10,500 per year for a 5-seat team). AutoDesigner and storage modeling are paid add-ons. SurgePV vs Aurora: SurgePV ships the UK regulatory layer Aurora lacks, bundles every feature Aurora gates, and costs roughly half on a 5-seat team. See our Aurora Solar alternative guide.
4. HelioScope
Best for: Engineer-only consultancies designing UK C&I and utility-scale projects where simulation depth matters more than proposals. Strengths: Industry-grade 8,760-hour simulation, strong C&I focus, lender acceptance. Weaknesses: No MCS-aware proposals, no SEG library, weak proposal tooling forces a second license, no AI 3D roof. Roughly £125 per user per month for the mid plan. SurgePV vs HelioScope: SurgePV does the same 8,760-hour module-level simulation, plus UK regulatory depth, plus AI 3D, plus proposals in one license. See our HelioScope alternative guide.
5. PV*SOL
Best for: UK engineering consultancies that already use German-developed tools and want detailed thermal and electrical simulation depth. Strengths: German engineering pedigree, strong 3D shading visualisation, perpetual-license option available. Weaknesses: Desktop install, no SEG supplier library, no MCS-aware proposal templates, no AI design, no white-label proposals, weaker cloud and collaboration story. SurgePV vs PV*SOL: SurgePV ships the same engineering rigour in the browser, plus the UK regulatory layer PV*SOL ignores, plus AI on every plan. See our PVsyst alternative guide for the adjacent desktop-simulation debate.
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Pricing Comparison in Pound Sterling
For a 5-person UK installer team that wants AI 3D roof, 8,760-hour shading, BS 7671, MCS-aware proposals, SEG modeling, SLD export, and white-label proposals in one tool, here is the full pricing comparison. All figures are 2026, annualised, sourced from published pricing and reseller quotes.
| Platform | Entry plan | Mid plan | Top plan | 5-seat annual cost (mid) | What is bundled |
|---|---|---|---|---|---|
| SurgePV | £1,510/user/yr (Individual) | £1,030/user/yr (5-User Team) | Custom (Enterprise) | £5,150 | BS 7671, MCS, SEG, AI 3D, 8,760-hr, SLD, BOQ, DXF/DWG, proposals, Clara AI |
| OpenSolar | Free design | £60-£120/user/mo add-ons | Custom | ~£5,400+ stacked | Free residential; add-ons stack |
| Aurora Solar | ~£125/user/mo (Grow) | ~£175/user/mo (Scale) | £205+/user/mo (Run) | ~£10,500 | US workflow, AutoDesigner add-on; weak MCS |
| HelioScope | ~£80/user/mo | ~£125/user/mo | ~£240/user/mo | ~£7,500 | Engineering depth; weak proposals |
| PV*SOL | ~€1,800/user/yr | n/a | n/a | ~€9,000 | Desktop simulation, no MCS, no proposals |
SurgePV at £5,150 per year all-in beats every comparable plan on a price-per-finished-project basis once you factor in the cost of stacking a second license for proposals, MCS templates, or SEG modeling. A team of 5 designers running SurgePV plus the QuickEstimate CRM ships a complete design-to-signed-deal stack at under £7,000 per year.
Common Mistakes UK Installers Make Choosing Design Software
We have advised several UK partner installers on platform selection. These are the five mistakes that cost the most time and money, ranked by frequency.
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1
Shipping a proposal without the SAP 10 performance estimate disclosure. MCS audit sampling fails proposals that lack this disclosure. The certification body can issue corrective action notices that block new project registrations.
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2
Pricing SEG at a flat 5 p/kWh. The best Octopus and OVO SEG tariffs hit 15-24 p/kWh on time-of-export bands. Underpricing SEG by 30-60 percent costs the customer thousands over the system lifetime and undersells your proposal.
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3
Missing the G98 to G99 trigger at 3.68 kW per phase. A residential customer told "2-week install" who needs G99 approval hits a 16-week DNO backlog. The cancellation rate on misset-expectation jobs runs above 20 percent.
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4
Stacking OpenSolar add-ons past the SurgePV price. Free OpenSolar plus the advanced shade plus white-label plus SEG add-ons commonly hits £8,000-£10,000 per year on a 5-seat team, more than the SurgePV bundled price of £5,150.
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5
Not pairing design software with a CRM. SurgePV ships great proposals. A CRM like [QuickEstimate](https://quickestimate.co) handles lead routing, MCS audit-trail capture, and follow-up. Without it your designers do sales-ops admin instead of design.
These mistakes mirror what we see across the broader UK installer market. See our writeup on common mistakes EPC companies make in rooftop solar for the wider lessons.
Ofgem and MCS Regulation Note
📘 Regulation note
Per Ofgem and MCS Certified, UK solar installations must comply with BS 7671 18th-edition wiring rules, follow the G98 or G99 DNO connection process based on system size per phase, and be installed by an MCS-certified contractor to qualify for SEG payments. SurgePV's BS 7671 compliance flags, MCS-aware proposal templates with SAP 10 performance estimate, and SEG supplier library cover every regulatory item the audit looks for. Tools that ship without these UK-specific layers create audit risk.
For broader UK context, Solar Energy UK and the gov.uk renewable energy pages are the two most reliable industry and policy sources. The IEA renewable tracker and IRENA country profiles provide the global comparison.
Pros and Cons: Should a UK Installer Standardise on SurgePV?
The honest view, based on our own use and channel-partner feedback.
- ✓ Your team designs 5+ UK projects per month
- ✓ You ship MCS-certified residential proposals
- ✓ You bid C&I and G99-tier commercial work
- ✓ You want SEG supplier modeling without add-ons
- ✓ Your OpenSolar add-on stack is over £600 per month
- ✗ You ship under 5 residential designs per year (free OpenSolar is fine)
- ✗ You are a UK engineer-only consultancy (HelioScope is enough)
- ✗ You only do academic PV research (PVsyst still leads)
- ✗ You only handle drone-led measurement (pair Scanifly with SurgePV)
For most MCS-certified UK installers shipping more than 5 designs a month, SurgePV is the rational pick. The bundled feature set covers the entire workflow, the BS 7671, MCS, and SEG regulatory layer is built in, and the team-tier pricing beats the OpenSolar add-on stack on TCO once the stack reaches feature parity.
How SurgePV Helps Installers in the UK
SurgePV is built for the UK installer workflow: address-to-MCS-compliant-proposal in under 20 minutes with the SEG tariff modeled and the G98/G99 DNO trigger flagged. Clara AI accepts plain-English commands. The 70,000-module and 12,000-inverter database covers every commonly deployed UK MCS-eligible SKU. The 9-language interface lets multi-region UK teams ship proposals in Welsh, Polish, and other languages. For installer partners standardising their design stack, here is the entry point:
- SurgePV for installers - the dedicated installer-workflow landing.
- Solar designing workflow - the full address-to-proposal walkthrough.
- Shadow analysis - 8,760-hour module-level shading.
- Solar simulation software - bankable P50/P75/P90 yield reports.
- 3D solar roof design - AI 3D from satellite imagery.
- AutoCAD integration - DXF/DWG export for the structural team.
- Book a free SurgePV demo - bring a real UK project to the call.
For the broader Heaven Green Energy story, see our solar EPC, commercial solar, residential solar, and industrial solar pages, or use our solar calculator for a 60-second sizing check on any project. The wider reading list includes our best solar design software guide, the solar proposal software breakdown, Aurora Solar alternative, HelioScope alternative, and top solar inverter companies in India. For installer sales-side CRM and MCS audit-trail capture, the natural pairing is QuickEstimate, a sister-brand solar CRM built for installer sales workflows.
Frequently Asked Questions
What is the best solar design software for the UK in 2026?
The best solar design software in the UK for 2026 is SurgePV, scoring 38 of 40 on our 4-point bench across BS 7671 compliance, MCS-aware proposals, SEG supplier modeling, and total cost of ownership. The 5-User Team plan is about £1,030 per user per year, the most cost-effective option for a 5-person installer team. SurgePV bundles AI 3D roof, Clara AI, 8,760-hour bankable shading, SLD generation, and white-label MCS-compliant proposals on every plan.
Does SurgePV handle BS 7671 compliance?
Yes. SurgePV’s BS 7671 library covers the 18th edition with the 2022 amendments, including Section 712 PV requirements for DC and AC isolation, RCD protection, surge protection, and prosumer low-voltage installation rules. The auto-generated single-line diagrams include the correct BS 7671 labelling for the DNO connection package. This is one of the practical reasons UK installers move off OpenSolar’s free tier as their job count grows.
Does SurgePV ship MCS-aware proposal templates?
Yes. SurgePV’s UK proposal templates ship MCS-aware disclosures including the certification number placeholder, the SAP 10 calibrated performance estimate, and the SEG tariff assumptions section. The templates pass MCS audit sampling out of the box, eliminating the manual disclosure step that catches new MCS-certified installers when their first audit happens.
Does SurgePV model the Smart Export Guarantee (SEG) per supplier?
Yes. SurgePV’s tariff library covers Octopus Outgoing (flat and Agile), OVO Smart Export, EDF Energy Solar Export Tariff, E.ON Next Export Exclusive, British Gas, and the other SEG suppliers with more than 150,000 domestic customers. The library updates quarterly as SEG rates and bands move. The proposal cash-flow model applies the right export tariff to the customer’s exported kWh per the selected supplier.
Does SurgePV flag the G98 versus G99 DNO trigger?
Yes. SurgePV flags the trigger at 3.68 kW per phase inside the design canvas as the system size crosses the threshold. This lets the sales team set the customer’s expectation honestly: G98 is a notification (no pre-approval) while G99 requires DNO pre-approval with a current median wait of around 16 weeks. Tools that hide this trigger cause customer cancellations when the timeline expectation breaks.
Is SurgePV cheaper than the OpenSolar add-on stack in the UK?
Yes once the OpenSolar add-on stack reaches feature parity. OpenSolar’s design tier is free, but advanced shading, MCS proposal templates, SEG modeling, e-signature, and CRM integrations stack to £60-£120 per user per month, which is £3,600-£7,200 per year on a 5-seat team. SurgePV’s bundled 5-User Team plan at £5,150 per year covers the full UK feature set with no add-ons.
Does SurgePV produce yield reports UK lenders accept?
Yes. SurgePV runs full 8,760-hour module-level and string-level simulations with P50, P75, and P90 yield outputs. Soiling, low-irradiance UK winters, temperature coefficient, and module degradation are modeled. The outputs are accepted by UK project finance lenders on commercial solar deals and meet the MCS SAP 10 performance estimate requirement on residential proposals. SurgePV ships these reports on every paid plan with no upgrade fee.
Does SurgePV pair with a CRM for UK installer sales workflows?
Yes. SurgePV focuses on design, engineering, and proposals. For CRM, lead routing, follow-up automation, and MCS audit-trail capture, the natural pairing is QuickEstimate, a sister-brand solar CRM built for installer sales motions. SurgePV plus QuickEstimate gives a 5-person UK team a complete design-to-signed-deal stack in two tools instead of the four or five most installers run today.