Commercial Solar Installers UK

Why Choosing the Right Commercial Solar Installer Matters More Than Choosing the Cheapest Quote

Commercial solar is a 25-year infrastructure investment. The panels may be identical whether your installer charges £650/kWp or £950/kWp — but the workmanship quality, DNO documentation, warranty support, and O&M response time are not. An incorrectly wired G99 protection relay can cause your system to trip repeatedly. A poorly sealed cable entry point causes water ingress that voids your roof warranty. Missing MCS certification means you cannot register for the Smart Export Guarantee.

The commercial solar sector has no shortage of installers willing to undercut on price by cutting corners on these items. This page explains exactly what to look for, what questions to ask, and why we believe we are the right choice for your project — with the track record to prove it.

What Makes a Good Commercial Solar Installer: The Complete Checklist

Before signing any contract, verify the following:

MCS certification is mandatory — any installer who cannot confirm current MCS status should be eliminated immediately.

Our Commercial Solar Installation Service — What You Get

Every project we undertake covers the full scope from first contact to commissioned system. Nothing is excluded from our quote that a professionally delivered commercial solar installation requires:

1. Free Site Survey and Technical Assessment

Our commercial surveyors visit your site, assess roof structure and orientation, check existing metering and switchgear, evaluate grid connection capacity, and identify any shading, access, or structural constraints. We provide a detailed written proposal within 5 working days.

2. System Design and Electrical Engineering

We produce full electrical schematics, string layout plans, equipment specifications, and yield calculations using PVsyst simulation software. All designs are reviewed by a qualified electrical engineer before submission to the DNO and client.

3. DNO G99 Application and Liaison

We submit the G99 application to your regional DNO (NGED, ENW, Northern Powergrid, SP Distribution, UK Power Networks, SSEN, WPD) on the day of contract signature. We manage all DNO correspondence and resolve any technical queries raised. DNO application fee: included.

4. MCS-Certified Installation

Our installation teams are MCS-certified, NICEIC-registered, and hold current ECS Gold Cards. All on-roof work is completed under a CDM Regulations-compliant method statement. Panels, inverters, and racking are from Tier 1 manufacturers with UK warranties.

5. Commissioning, G99 Witness Testing, and Handover

We commission the system, programme inverter protection relay settings to DNO specification, arrange and attend G99 witness testing with the DNO, and provide full handover documentation including MCS certificate, G99 approval, monitoring credentials, and O&M manual.

Commercial Solar Installers by Region

We install commercial solar across England, Wales, and Scotland. Our regional experience with DNO connection requirements, local planning authorities, and grid constraints ensures faster project delivery with fewer surprises.

G99 timelines from application submission. We submit at contract signature to run in parallel with procurement.

Commercial Solar Installers Scotland — MCS Certified Scottish Projects

Scotland requires additional consideration beyond standard G99 practice. SP Distribution (SP Energy Networks) has specific protection relay requirements and, from January 2026, requires all new grid-connected systems to incorporate Smart Export Functionality (SEF) — a remote disconnection capability. Our Scottish installations are commissioned to SPEN's published technical schedule, and all inverters we specify for Scottish projects are pre-configured for SEF compliance.

Scottish businesses also benefit from Business Energy Scotland (BES) grants of up to £10,000 for SMEs, and Scotland's NPF4 planning framework is the most supportive of renewable energy in the UK. We have completed commercial solar projects in Glasgow, Edinburgh, Aberdeen, Dundee, Stirling, and Inverness — and our team understands the nuances of SPEN's connection process and Scottish planning policy.

Agricultural Solar PV Installer — Farm and Rural Projects

Agricultural solar requires specialist knowledge that general commercial installers often lack: asbestos cement roof procedures, Permitted Development thresholds for agricultural buildings, G99 for rural three-phase supplies with long feeder distances, structural assessment of portal frame and timber frame barns, and integration with grain dryers, milking parlours, and poultry ventilation systems. Our agricultural solar team has installed systems on over 80 farms across England, Wales, and Scotland.

Key agricultural installer requirements — what to check:

• ✓Experience with asbestos cement (ACM) roofs under Control of Asbestos Regulations 2012 — requires licensed contractors and correct disposal routes
• ✓Knowledge of Class A and Class B Permitted Development for agricultural buildings — incorrect PD assessment can cause enforcement action
• ✓G99 experience with rural NGED, SP Distribution, and SSEN connections where feeder lengths are long and voltage profiles are different to urban supplies
• ✓Structural assessment capability for portal frame buildings where roof loads must be verified before installation
• ✓Farm-specific energy load analysis — grain dryers, milking equipment, ventilation fans require careful self-consumption modelling

Case Studies: Recent Commercial Installations

200kWp Manufacturing Facility, East Midlands

A precision components manufacturer installed 200kWp across two factory rooftops in January 2025. The project included NGED East Midlands G99 application (approved 10 weeks), 100kWh LFP battery storage for peak shaving, and ESOS Phase 3 documentation. Year-1 saving: £43,100 at 22p/kWh. Payback after AIA: 2.9 years.

150kWp Logistics Hub, South Wales

A third-party logistics operator installed 150kWp on a flat EPDM warehouse roof near Cardiff in March 2025. East/west ballasted arrays, NGED South Wales G99, no roof penetrations. FLD Electrical installed. Year-1 saving: £29,000. SEG export: £1,200/year.

80kWp Poultry Farm, Yorkshire

An intensive poultry producer installed 80kWp on two broiler sheds via hook-and-clamp racking. ACM replacement on one shed included in scope. Northern Powergrid G99. 93% self-consumption rate (ventilation fans run 18 hours/day). Payback: 3.2 years.

“The G99 process was something I was worried about — I'd heard stories of 6-month delays from other businesses. They submitted ours the day after contract, chased NGED weekly, and we were commissioned in 11 weeks. Really professional.”

How to Get the Most from Your Commercial Solar Installer

Whether you choose us or another MCS-certified company, these steps will protect your investment:

1. Get 3 comparable quotes — ensure all include G99 application, MCS certification, scaffolding, and commissioning. Strip out ambiguity.
2. Ask for the G99 submission date — a good installer submits this on day 1. If they say 'we'll submit when we start installation', they'll add 10 weeks to your timeline.
3. Check the inverter and panel warranties are transferable — if you sell the building, the warranties should follow the asset.
4. Request the MCS certificate number before final payment — this is your entitlement to SEG and your proof of regulatory compliance.
5. Set up monitoring access yourself — don't rely on the installer to tell you if the system underperforms. Register your own account on SMA Sunny Portal, Sungrow iSolarCloud, or equivalent.
6. Retain the commissioning report — this documents the baseline performance and is essential for warranty claims if output degrades beyond the guaranteed minimum.

Frequently Asked Questions