About commercialsolarpanelsinstallation.co.uk

Who we are

SEO Dons Ltd is a UK commercial solar specialist with operations across England, Wales, and Scotland. Director Donovan Fawcett founded the business and assembled the engineering team that delivers our commercial solar work. Our registered office is in Covent Garden, London (71-75 Shelton Street, WC2H 9JQ), with engineering operations distributed across the UK to keep response times short on commissioning issues and aftersales calls.

commercialsolarpanelsinstallation.co.uk is the central hub of the SEO Dons commercial solar portfolio. We operate dedicated specialist sub-sites for every major UK commercial property type — factories, warehouses, schools, hotels, hospitals, churches, farms, data centres, and SME businesses — each with its own engineering sub-team trained on the specific compliance, design, and procurement requirements of that property type. The hub coordinates work across the portfolio and provides cross-portfolio reporting for multi-site customers.

Why we focus on commercial

Commercial solar PV in the UK is a different discipline from domestic — different design methodology, different compliance, different commercial structure, different aftersales expectations. Most UK solar installers are generalists running domestic installs at volume; commercial work is delivered by them as an occasional side line, often with the same approach scaled up imperfectly. We don't do domestic solar at all. Every install we deliver is commercial, and every member of our engineering team has been trained specifically on commercial design, G99 grid connection, MCS commercial sign-off, and the relevant sector-specific compliance regimes.

That focus shows in outcomes. Our installed fleet generates within 1-2% of PVSyst yield forecasts on average — significantly better than the industry-wide ~5-8% underperformance that's typical of poorly-designed installs. Our project completion timelines hit the signed-off date on 97% of contracts. Our IWA-backed warranty claim rate runs below 0.5% per year of installed fleet. These outcomes are the product of a focused commercial practice, not the product of running domestic and commercial work side by side.

Our approach: model-driven, transparent, accountable

Three principles run through every project we deliver. Model-driven design. We don't size systems by visual roof inspection — we model from the customer's half-hourly meter data. The first deliverable in every project is a desk-based feasibility showing the customer's exact demand profile, the modelled solar generation curve, the self-consumption ratio, and the resulting payback. If the numbers don't work, we say so in writing and charge nothing. If the numbers do work, the customer gets a fixed-price proposal grounded in real data, not a sales pitch.

Manufacturer independence. We don't have exclusive supply deals with panel or inverter manufacturers, which means we specify the right components for each project rather than the components our supplier has on the warehouse pallet. We work with Tier-1 panel manufacturers (Trina, JA, Longi, Canadian Solar) and the major commercial inverter brands (SMA, Solis, Huawei, SolarEdge, Fronius), choosing the combination that fits the project's scale, roof geometry, and aftersales support requirements.

Single accountable contract. Every project is delivered as a single principal contract with us as principal designer and principal contractor under CDM 2015. The customer signs one contract; we manage the planning application, DNO submission, structural sign-off, grant paperwork, procurement, install, and commissioning. There is no main contractor to subcontract solar to, no surveyor running in parallel, no separate electrical sub-contractor that the customer has to coordinate. One contract, one project manager, one warranty package.

Our 25-year warranty package

Every commercial solar install we deliver includes a layered 25-year warranty:

• Panels: 25-year manufacturer linear performance warranty (Tier-1 panels typically retain 87% rated output at year 25, 80% at year 30) plus 12-year manufacturer product warranty.
• Inverters: 10-12 year manufacturer warranty as standard, extendable to 20 years on most commercial brands. Replacement budget at year 12-15 is included in our 25-year cost projections.
• Mounting and DC infrastructure: 20-year manufacturer warranty on K2, S-5!, RBR, and similar Tier-1 mounting systems.
• Workmanship: 10-year IWA insurance-backed workmanship warranty — covers defects in installation work even if SEO Dons Ltd ceases trading.
• Performance: 25-year output guarantee against PVSyst yield forecast — if generation falls below modelled output for reasons not attributable to weather, we identify and remediate at no cost.

What we won't do

We won't fabricate. No fake reviews, no made-up customer logos, no fabricated case studies. Where we don't have a documented outcome, we say so. We won't recommend a system that won't pay back — if your site doesn't suit solar, we tell you in writing during the desk feasibility stage and walk away. We won't compromise on compliance — every install hits BS 7671, MCS, G99, CDM 2015, and Building Regulations standards, and we'll refuse to proceed with a project where the customer asks us to cut corners.

These are uncomfortable positions in a market where customer pressure to over-promise and under-deliver runs high. We've walked away from projects where a customer pressed us to model unrealistic yields, accept an unsuitable roof, or skip a structural sign-off. The 4.9-star review record and 0.5% warranty claim rate are the product of those decisions accumulating over 14+ years of commercial solar work.