How pricing structure – not just the headline cost – determines what you’ll pay over time

Key takeaway
Two solar installation quotes can show the same total price but behave very differently over time.
The difference isn’t the panels or batteries – it’s where the installer places their profit, and how that affects upgrades and system quality later.

You’ve done the sensible thing. You’ve gathered two solar quotes, read them carefully, and checked that the panels, inverter and battery look broadly comparable. The totals are almost identical, so it’s tempting to assume the choice doesn’t really matter.

But a solar panel quote isn’t just a list of equipment. It’s also a pricing model – and that model only really reveals itself once you start changing the system.

This is something we see regularly with homeowners, particularly once they begin comparing solar installation quotes in detail.

Why the structure of a solar quote matters

In the UK, MCS sets the technical standards for solar installations and certification, but it does not dictate how installers structure their pricing. Each company decides how much detail to show and where to include its profit.

Many solar installers choose to load a significant share of their profit margin into the equipment lines – panels, inverters and batteries – while keeping labour costs looking lean.

This approach allows an installation to appear better value on paper. Customers often feel more comfortable paying for equipment rather than services; it feels like they are getting a better deal – even though the overall cost looks the same.

But when product prices are inflated, every step toward a better system – more panels, more storage, higher-spec equipment – costs more than it needs to. That quietly pushes homeowners toward a reduced specification, not because it’s the right system, but because the margin has already absorbed part of the budget.

Two solar quotes, same total, different structure

Below is a simplified version of a real UK residential system using current market pricing (Feb, 2026) for 10 panels, a hybrid inverter and a 9.5 kWh battery. Both quotes reach the same total system cost, but the money is allocated very differently.

Quote 1 – Transparent structure (0% markup on goods and materials)

Goods subtotal (0% markup): £4,130
Panels, mounting, inverter, battery, protection, cabling, monitoring and delivery priced at true UK market cost.

Services subtotal: £4,450
Installation, battery fit, scaffolding, AC works, commissioning, compliance and certification, priced at honest UK rates.

Total system cost (0% VAT): £8,580

In Quote 1, column B, , the value of skilled labour, system design and compliance work is visible, and the equipment pricing reflects what the hardware actually costs.

Quote 2 – Same total, margin folded into the kit

Shown in column C, the same exact system, the same overall price – but with a 40 percent margin built into the equipment lines and artificially lower labour costs.

Goods subtotal (with markup): £5,765
Services subtotal: £2,815
Total system cost: £8,580

On paper, the total is identical. And it is human nature to want to ‘get a deal’: to pay less for the installation and a greater portion of total spend to go towards hardware.

Both pricing approaches are legal. The difference is how clearly the homeowner can see what they are paying for.

But what happens when you expand the system?

Most residential solar systems evolve after the first survey. A very typical next step is adding more storage and a few extra panels once energy use becomes clearer.

Using the same example above, imagine the homeowner decides to add:

One additional 9.5 kWh battery
Four additional panels

With transparent solar pricing (0% markup on goods)

Every pound of that increase goes directly into additional capacity and performance.

With margin baked into the equipment, the total cost increase is £876 more for the same battery, the same panels and broadly the same work – purely because profit is applied to the hardware.

At the original installation stage, the two solar quotes appeared equivalent. As soon as the system grows, the pricing models diverge quickly.

Why this matters when comparing solar installation quotes

When a large share of cost is hidden inside equipment prices:

Improving the system becomes disproportionately expensive
You end up paying more for products rather than skilled workmanship
Budget that could have gone into performance is absorbed by margin

When goods and services are clearly separated and priced realistically:

Upgrades improve system quality, not installer profit
You stay in control of how your money is spent
You can afford the best system your budget allows, not the one margins force you into

Eva’s Energy’s approach to solar pricing

Eva's Energy Ltd installs solar panels and battery storage to homes across Bromley, Southeast London and Kent borders.

Importantly, and what makes us unique - at Eva’s Energy, panels, inverters, batteries and mounting equipment are passed through at their true underlying cost, with 0 percent markup on goods and materials. Profit is earned transparently through clearly defined services such as system design, installation, testing and compliance.

The practical effect is simple: when you choose to add capacity or upgrade components – now or years later – your additional spend goes into better technology on your roof and in your battery, not into hidden percentages on top of hardware.

The one question worth asking before choosing a solar installer

How much markup do you add to goods and materials?

That single answer will tell you almost everything you need to know about how a quote is structured.