Solar Panel Installation Quote UK: 2026 Cost Guide
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Quick Answer
A good UK solar panel installation quote should state the total system size in kWp, the number and exact model of panels, inverter specification, estimated annual generation, scaffolding and electrical work, monitoring, warranties, certification, payment terms and full installed price. It should also make exclusions clear. Energy Saving Trust and the Renewable Energy Consumer Code recommend getting at least three quotes. In 2026, an average 4.5kWp home solar system costs about £7,600 according to Energy Saving Trust, although roof complexity, equipment choice, system size and battery storage can move the price significantly.
Solar Panel Installation Quote UK: What It Should Include and How to Compare Prices in 2026
Getting a solar panel installation quote should give you far more than one total price. A useful quote should show what system is proposed, what it is expected to generate, what work is included, and which warranties and protections apply.
That matters because two similar-looking quotes can describe very different systems. One may include scaffolding and electrical work, while another leaves them as extras. Panel output, inverter type, roof access and battery storage can also change the final cost.
For a current benchmark, Energy Saving Trust says an average home solar system is around 4.5kWp and costs about £7,600 to install. Your own price may be higher or lower, so treat national figures as a sense-check rather than a substitute for a property-specific survey.
By the end of this guide, you will know what to expect from a solar quote, how to compare installers fairly and which questions to ask before signing.
Ready to compare your options? Compare solar panel installation quotes from installers covering your area.
How Much Should a Solar Panel Installation Quote Be?
There is no single correct price for every UK home. Energy Saving Trust currently gives about £7,600 as the typical cost of a 4.5kWp domestic solar PV system. The final quotation should reflect your roof and electricity use.
Costs can rise if the roof is difficult to access, needs complex scaffolding or requires remedial work. Larger systems and premium equipment cost more. A battery, optimisers, bird protection, EV charger or consumer-unit work can also increase the total.
Qualifying residential solar installations are currently zero-rated for VAT across the UK until 31 March 2027. Under current legislation, the rate is due to return to 5% from 1 April 2027 unless the rules change. Check the latest GOV.UK VAT guidance for energy-saving materials before relying on the tax treatment in a quotation.
Do not judge value from the headline figure alone. A lower quote that excludes scaffolding or electrical upgrades may ultimately cost more than a higher all-inclusive quote.
What Should a Solar Panel Installation Quote Include?
A quotation should make it possible to understand exactly what you are buying.
| Quote item | What to look for | Why it matters |
|---|---|---|
| Solar array | Panel make, model, quantity, wattage and total kWp | Panel count alone does not show total capacity |
| Inverter | Make, model, rating, warranty and monitoring | Affects system design and future battery options |
| Generation estimate | Expected annual output in kWh and assumptions | Lets you compare likely production |
| Installation scope | Mounting, scaffolding, cabling, electrical work and commissioning | Prevents essential work becoming a surprise extra |
| Warranties | Product, performance, inverter and workmanship cover | Clarifies responsibility if faults arise |
| Certification and grid work | MCS status and DNO process | Important for compliance and export-payment eligibility |
| Price and payments | Total price, VAT treatment, deposit, stages and exclusions | Shows your real financial commitment |
The Renewable Energy Consumer Code’s consumer guidance advises consumers to obtain at least three quotations and to get a written, all-inclusive breakdown with a performance estimate specific to the property before signing.
Why Do Solar Panel Quotes Vary?
The main reason is that installers may not be quoting the same job.
System size
A quote should show capacity in kilowatts peak, or kWp. Comparing only panel numbers can mislead because individual panel wattages differ.
Roof and access
A simple pitched roof is usually easier to price than one with dormers, fragile coverings, several elevations or difficult scaffold access. If roof condition is uncertain, part of the price may remain subject to survey.
Panel, inverter and battery choice
Higher-efficiency panels can help when roof space is limited, but they may cost more. Inverter design also affects price and future battery options. If a battery is included, compare usable capacity, power output, warranty and whether backup operation is part of the package.
For equipment comparisons, see Get Free Quote’s guide to the best solar panels for UK homes.
How to Compare Solar Panel Quotes Fairly
Put each quotation on the same basis before comparing the bottom line.
| Comparison point | Quote A | Quote B | Quote C |
|---|---|---|---|
| Total solar capacity (kWp) | |||
| Expected annual generation (kWh) | |||
| Panel make/model | |||
| Inverter make/model | |||
| Battery usable capacity, if any | |||
| Scaffolding included? | |||
| Electrical upgrades included? | |||
| MCS-certified installation? | |||
| Workmanship warranty | |||
| Total installed price | |||
| Exclusions or provisional costs |
If one installer predicts much more generation from a similar-sized array, ask why. Orientation, shading, roof pitch and location should be reflected in the estimate.
Likewise, ask why one installer proposes a much larger system. More capacity is not automatically better if the roof, grid connection or household usage does not justify it.
Get a Survey Before Treating the Price as Final
Online estimates are useful for budgeting, but a final quote should be based on enough information to confirm the design.
A proper assessment considers roof dimensions, orientation, pitch, shading, condition, access, cable routes and existing electrical equipment. Read the Get Free Quote solar panel installation survey guide before the visit so you know what the installer should check.
If the survey changes the design or price, ask for the revised scope in writing. Do not rely on a verbal assurance that an excluded item “should be fine”.
Check the Installer as Carefully as the Equipment
Energy Saving Trust recommends obtaining three quotes from MCS-certified installers. Suitable certification also matters when applying for Smart Export Guarantee payments.
Check the installer’s current status through the MCS installer directory rather than relying only on a logo. You can also review consumer-code membership and the protections applying to deposits and workmanship warranties.
RECC advises consumers not to pay more than 25% of the contract price upfront and to make sure advance payments are protected.
For more help with credentials, use Get Free Quote’s UK solar panel installers guide.
Solar Quote Red Flags
Be cautious if a proposal gives you only a package name and total price. You should be able to identify the exact panel and inverter models, system capacity and work included.
Question savings claims that do not show annual generation, electricity-price assumptions, self-consumption or export assumptions. Savings are estimates, not guarantees.
Pressure to sign immediately is another warning sign. RECC specifically cautions consumers about pressure selling and discounts offered for signing on the day.
Also look for vague exclusions such as “scaffolding extra”, “electrical work TBC” or “subject to DNO” without an explanation of what could change.
Export Payments and Future Upgrades
The Smart Export Guarantee explained by Ofgem requires participating electricity suppliers to pay eligible small generators for exported electricity. Rates, contract lengths and other terms can vary between suppliers, so no single export rate should be treated as guaranteed for the life of the system.
Ask whether the proposed installation includes the metering and certification needed to apply for an export tariff.
If you may buy an EV, install a heat pump or add battery storage later, say so before the design is finalised. The inverter choice, cable routes and available capacity can affect how easy future upgrades are.
Questions to Ask Before Accepting a Quote
Before signing, ask the installer to confirm:
What is the total system size in kWp?
Which exact panel and inverter models are included?
What annual generation is forecast, and on what assumptions?
Is scaffolding included?
Are electrical upgrades likely?
Who handles the DNO process?
What warranties apply?
Is the installation MCS-certified?
What deposit is required and how is it protected?
Which costs could change after the survey?
Is battery storage included or optional?
What documentation will I receive at handover?
A clear installer should be able to answer these questions in writing.
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Energy Saving Trust currently puts an average 4.5kWp domestic solar installation at around £7,600. Your actual quote can vary with system size, roof access, equipment and extra electrical work.
Aim for at least three. Both Energy Saving Trust and RECC recommend comparing three quotations rather than relying on a single proposal.
It should identify the panels, inverter, total kWp, predicted generation, installation work, scaffolding, electrical work, warranties, certification, price, payment schedule and exclusions.
The quote should state clearly whether scaffolding is included. Never assume it is part of the headline price.
Qualifying installations are zero-rated until 31 March 2027 under current UK rules. They are scheduled to move to the reduced 5% rate from 1 April 2027 unless legislation changes.
kWp means kilowatts peak. It describes the rated maximum capacity of the solar array under standard test conditions.
Yes. A useful proposal should show estimated annual generation in kWh and explain the assumptions used for the calculation.
Energy Saving Trust recommends obtaining quotes from MCS-certified installers. Suitable certification is also relevant when demonstrating eligibility for SEG export payments.
The Smart Export Guarantee, or SEG, enables eligible small-scale generators to receive payments for electricity exported to the grid. Participating suppliers set their own rates and contract terms.
Yes, particularly if the survey reveals roof, access or electrical issues that could not be confirmed remotely. Any revised price or scope should be provided in writing.
RECC advises consumers not to pay more than 25% of the contract value upfront and to check how the payment is protected.
Not automatically. Compare system capacity, equipment, predicted generation, included work, warranties and exclusions before judging value.
That depends on your usage pattern, tariffs, budget and future plans. Compare a solar-only quotation with a solar-and-battery proposal so you can see the additional cost separately.
Often, yes. Tell the installer in advance because inverter choice, electrical design and cable routes can affect how straightforward a later retrofit will be.
There is no universal validity period. The installer should state an expiry date or explain how long the quoted equipment and price are guaranteed.
Conclusion
The safest way to assess a solar panel installation quote is to compare the full design, scope and protections rather than the cheapest headline price.
Use Energy Saving Trust’s current £7,600 average for a 4.5kWp system as a benchmark, then focus on your property. Compare at least three detailed quotes, check MCS status, examine generation assumptions and make sure scaffolding, electrical work, warranties and exclusions are clear.
Get Free Quote helps homeowners understand their options and compare quotations. Visit the Get Free Quote home page to start exploring your options.
