Solar Panel Installation Costs UK — System Sizes, Payback Periods and Quoting Guide (2026)

The UK Solar Market in 2026

Solar PV is the UK's fastest-growing renewable sector. The government's net-zero commitments, combined with electricity prices sitting around 28p/kWh on the standard tariff, have made payback calculations far more attractive than they were five years ago. The Feed-in Tariff (FiT) closed to new applicants in 2019, but the Smart Export Guarantee that replaced it has matured — most big energy suppliers now offer export tariffs, and some specialist suppliers pay 15p/kWh or more for surplus electricity exported to the grid.

For installers, the market is competitive but well-rewarded. MCS accreditation is the entry ticket: without it, your customers cannot access SEG payments, and savvy homeowners know this. Getting accredited costs £2,000–£5,000 per year for a small company, but it unlocks a customer base that actively filters out non-MCS installers when searching online.

Solar Panel Installation Costs by System Size

Prices below are fully installed — panels, inverter, mounting rails, AC/DC cabling, generation meter, commissioning, DNO notification and MCS certificate. Scaffolding is included where a pitched roof requires it. VAT on domestic solar is currently 0%.

Battery Storage: Cost and Which Systems Are Popular

Battery storage is increasingly sold alongside solar PV rather than as an afterthought. Customers who work from home or have an EV see the biggest benefit — they can store excess daytime generation and use it in the evening when grid electricity is most expensive. Adding a battery also reduces what the customer exports at low SEG tariffs.

A 5–10kWh battery typically costs £2,500–£5,000 installed, depending on brand and capacity. The three brands your customers are most likely to ask about:

Adding battery storage pushes the payback period out — from 8–12 years for solar-only to 10–15 years for a solar-plus-battery system. However, as electricity prices continue to rise, the economics improve over time and many customers prioritise energy independence over pure payback speed.

Smart Export Guarantee: What Your Customers Will Earn

The Smart Export Guarantee replaced the Feed-in Tariff for new installations from January 2020. Unlike FiT, there is no fixed government rate — each licensed energy supplier sets their own export tariff, and they must offer at least one SEG tariff to their customers. In practice, tariffs in 2026 range from about 5p/kWh on some standard deals up to 15p/kWh with specialist suppliers like Octopus Energy's Outgoing Octopus tariff.

For your customers to claim SEG, the installation must be by an MCS-accredited company, and the system must be MCS-certificated. This is non-negotiable — it is your most important credential when competing for solar work. Customers increasingly check the MCS installer database before shortlisting quotes.

At 10p/kWh export rate and assuming 50% of generated electricity is exported (a rough rule of thumb for homes without battery storage), a 4kW system generating 3,400 kWh/year would earn the customer around £170/year in SEG payments — on top of the electricity bill savings from self-consumed power.

Annual Savings and Payback Periods

At the current standard electricity rate of around 28p/kWh, a typical 3–4kW system saves a household £400–£700 per year on their electricity bill, depending on how much of the solar generation they consume directly (self-consumption rate). Homes where occupants are in during the day — remote workers, retirees, families with young children — achieve higher self-consumption rates and therefore higher savings.

These figures assume electricity stays at roughly 28p/kWh. If prices rise further — as many analysts expect — payback periods shorten materially. A system installed in 2026 typically carries a 25-year panel performance warranty and a 10–12 year inverter warranty, so the economics beyond payback are almost pure saving.

MCS Accreditation and DNO Notification Requirements

MCS (Microgeneration Certification Scheme) accreditation is the cornerstone of the UK solar installation industry. Without it, your customer cannot register for the Smart Export Guarantee. Accreditation costs an installer £2,000–£5,000 per year for a small company, covering the scheme membership, audit, and quality management requirements. It is a genuine barrier to entry and differentiator — make sure it is prominent in your quotes and marketing.

DNO (Distribution Network Operator) notification is a separate requirement governed by Engineering Recommendations G98 and G99:

• G98 — applies to systems up to 3.68kW per phase (single phase). You must notify the DNO within 28 days of commissioning. No prior approval needed.
• G99 — applies to systems above 3.68kW per phase. You must apply for approval before installation. The DNO has 45 working days to respond. Factor this into project timelines.

Getting the G99 application wrong or missing it entirely is a red flag that experienced customers will spot. Always complete DNO paperwork and include the confirmation reference in your handover pack.

Roof Suitability and Planning Permission

Not every roof is suitable for solar, and being honest about this in the survey builds trust. The key factors to assess:

• Orientation: South-facing at 30–45° pitch is optimal, producing around 20% more energy than east/west-facing panels. East and west are acceptable — many installers now use east/west split arrays on large roofs to spread generation through the day. North-facing is generally not viable for domestic solar.
• Shading: Even partial shading on one panel can reduce output across a string. Carry out a shading assessment — use a SunEye tool or software like PVsyst. Where shading is unavoidable, panel-level optimisers (Tigo, SolarEdge) mitigate the impact significantly.
• Roof condition: Check for damaged or missing tiles, weak rafters, and any signs of rot or movement before mounting. A structural issue discovered after installation is a costly problem for both parties.
• Planning permission: Solar panels on a domestic roof are generally permitted development in England, Scotland and Wales — no planning application needed. Exceptions include listed buildings and properties in designated conservation areas, where you'll need listed building consent or planning permission. Always check before proceeding.

EV Charger Integration and Solar Diversion

The combination of solar and an EV is one of the strongest upsells available to solar installers in 2026. A homeowner with both can dramatically increase self-consumption by charging their car from surplus solar generation rather than from the grid.

Smart EV chargers with solar diversion capability — the Zappi by myenergi and the Ohme Home Pro are the most widely installed — monitor the solar inverter output and ramp up or down the charging rate to match what is being generated. This means excess solar that would otherwise be exported at 5–10p/kWh is instead used to charge the car at an effective rate of 28p/kWh (the cost of grid electricity avoided). For a customer driving 8,000 miles a year, this can save an additional £300–£600 annually.

If you are already MCS-accredited for solar, consider adding OZEV-authorised EV charger installation to your scope of work. The combined solar-plus-charger quote is a strong proposition that competitors offering only one technology cannot match.

How to Structure Your Solar Quote

Solar quotes have more technical detail than most trade jobs, and customers spend time comparing them. A well-structured quote signals professionalism and builds the confidence needed to get a signature. Here is what to include:

• kWp capacity and panel count: State the system size in kilowatt-peak, the panel brand and model, and the number of panels. Customers increasingly research panel efficiency ratings.
• All-in price vs. itemised breakdown: Show a total installed price, but break out the major components — panels, inverter, battery (if applicable), mounting system, electrical work and commissioning. This helps customers understand what they are paying for and reduces price objections.
• Estimated annual generation: Use MCS-compliant generation estimates based on postcode, pitch and orientation. Tools like PVCalc or the MCS product eligibility database give defensible figures.
• Projected savings and payback: Include estimated annual electricity bill saving and SEG income. Use realistic assumptions and document them — avoid inflated savings claims, which are a leading cause of customer disputes and negative reviews.
• Handover pack and monitoring app: Confirm what the customer will receive on completion — MCS certificate, DNO notification confirmation, warranty documents, inverter monitoring app setup, and grid export meter registration. Setting this expectation upfront differentiates you from budget operators.

Red Flags to Warn Customers About

Part of building trust with a new customer is helping them understand what separates a reputable installer from a poor one. Homeowners are increasingly research-savvy — being the installer who flags these issues positions you as the trustworthy choice:

• Non-MCS installers: A customer cannot claim SEG payments if their installer is not MCS-accredited. This is a significant financial loss over the system's lifetime. Competitors quoting significantly below market rate are often either non-MCS or using substandard panels.
• No DNO notification: Skipping the DNO process is not just non-compliant — it can create problems with insurance and future property sales. Any competent installer handles this as standard.
• Unrealistic savings claims: Quotes that promise a 5-year payback on a £9,000 system, or that assume electricity prices will double every two years, are misleading. Use conservative, documented assumptions.
• No site survey: Any reputable installer conducts a physical or detailed remote roof survey before quoting. A quote produced from just a postcode and a phone call is not worth the paper it is written on.

How Trade2Base Helps Solar Companies Win Better Leads

Solar is a high-value, high-competition sector. Most solar companies are advertising across multiple channels simultaneously — Google Ads, Checkatrade, word-of-mouth referrals, leaflet drops, social media. The problem is that not all channels produce the same quality of lead. A lead from a Google search for "solar panel installer near me" behaves very differently from a lead generated by a referral from a satisfied customer.

Trade2Base tracks where every enquiry comes from and links it through to whether it converted into a booked job, a completed installation, and the value of that job. Over time, you get a clear picture of which marketing channels are genuinely producing your best solar customers — not just the most enquiries, but the ones who book, who do not haggle excessively, and who refer others.

For solar companies spending £1,000–£3,000/month on Google Ads alone, knowing whether that spend is producing a 3x or a 10x return is the difference between a tight margin business and a profitable one. Trade2Base gives you that visibility without requiring a dedicated marketing team to run the analysis.