Compare Solar Panel Quotes UK: 2026 Buyer's Guide
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Quick answer:
When comparing solar panel quotes, first check whether each installer is proposing the same size and type of system. Compare the array capacity in kWp, panel and inverter models, estimated annual generation, battery specification, scaffolding, electrical work, warranties and certification. Then compare the total installed price rather than the panel price alone. Ask installers to explain any major difference in predicted generation or savings. For domestic installations, also check MCS credentials where relevant, payment terms, deposit protection and who handles electricity-network paperwork. The cheapest quotation is not necessarily the best-value installation.
Compare Solar Panel Quotes UK: How to Choose the Right Quote in 2026
Comparing solar panel quotes is about much more than finding the lowest price. Two installers can quote for the same house yet propose systems with different panel capacities, inverters, warranties, generation estimates and installation work.
That means a £6,000 quote is not automatically better value than one costing £7,000.
To compare solar panel quotes properly, you need to put each proposal on the same basis. Check the total system size, equipment specification, estimated annual generation, installation scope, warranties and payment terms before looking at the final figure.
This guide explains exactly what UK homeowners should compare before choosing an installer.
If you are still gathering prices, you can start with Get Free Quote and request comparable quotations before making a decision.
What should you compare in a solar panel quote?
Start by creating a simple side-by-side comparison.
| What to compare | What the quote should show | What to ask |
|---|---|---|
| Solar array | Panel number, wattage and total kWp | Are all quotes offering similar capacity? |
| Panels | Manufacturer and exact model | What product and performance warranties apply? |
| Inverter | Make, model and rated output | Why is this inverter suitable for the array? |
| Generation | Estimated annual kWh | What roof, shading and loss assumptions were used? |
| Battery | Brand, model and usable capacity | Is battery storage included or optional? |
| Installation | Mounting, scaffolding and electrical work | What could generate an additional charge? |
| Certification | Relevant installer and system documentation | Who provides the MCS certificate and DNO paperwork? |
| Warranty | Product, inverter and workmanship cover | Who handles a claim if something fails? |
| Price | Full installed price | Is everything required to commission the system included? |
A detailed proposal makes comparison much easier. The MCS Customer Commitment says certified installers should provide clear written quotations, transparent pricing and realistic performance estimates before customers enter a contract.
For a deeper breakdown of individual quotation documents, see the solar panel installation quote guide.
Compare system size before comparing price
The first number to find is the system’s total capacity in kilowatt peak, or kWp.
For example:
10 × 430W panels = 4.3kWp
12 × 450W panels = 5.4kWp
14 × 450W panels = 6.3kWp
A larger system will usually cost more, so comparing headline prices without checking kWp can be misleading.
Suppose Installer A quotes £6,200 for 4kWp while Installer B quotes £7,000 for 5kWp. Installer A appears cheaper, but Installer B is proposing substantially more generating capacity.
Price per kWp can therefore be a useful first comparison:
Total installed cost ÷ system capacity = approximate cost per kWp
However, do not use this number on its own. Roof complexity, panel quality, inverter design, scaffolding and electrical upgrades all affect cost.
Check the panels and inverter
Two systems with identical capacity can contain very different equipment.
Ask for the exact manufacturer and model of every major component rather than descriptions such as “premium panels” or “Tier 1 panels”.
For solar panels, compare:
wattage
product warranty
performance warranty
efficiency
degradation guarantees
manufacturer support
If you are comparing equipment options, the best-value solar panels UK guide can help you judge whether paying more for a particular panel specification makes sense.
The inverter deserves equal attention. It converts the panels’ direct-current electricity into alternating current your home can use.
Quotes may contain a standard string inverter, hybrid inverter, microinverters or power optimisers. These are not automatically better or worse than one another. Their suitability depends on your roof layout, shading, battery plans and system design.
Ask each installer to explain why the proposed inverter suits your property.
Compare estimated generation, not just installed capacity
Every quotation should include an estimate of how much electricity the system could generate.
Compare the figure in kilowatt-hours per year, or kWh.
If two installers propose almost identical arrays but one predicts dramatically higher generation, ask why.
Differences may result from assumptions about:
roof orientation
roof pitch
local solar irradiation
shading
system losses
inverter performance
panel layout
A higher estimate is not automatically a better system.
MCS guidance requires certified installers to provide realistic system-performance estimates and warns consumers against making decisions purely from projected financial benefits or particular energy tariffs.
The Energy Saving Trust also provides a solar energy calculator that can give homeowners an independent reference point before discussing figures with an installer.
Check exactly what the installed price includes
A useful solar quote should make clear what you will actually receive for the final price.
Look for mounting equipment, scaffolding, inverter installation, electrical protection, monitoring equipment, commissioning and relevant certification.
Also check whether the installer expects additional charges for:
consumer-unit upgrades
difficult roof access
roof repairs
bird protection
cable-routing complications
additional scaffolding
export-limitation equipment
Unexpected extras can quickly turn the cheapest initial quotation into the more expensive installation.
For qualifying installations, HMRC currently applies 0% VAT to installed solar panels in residential accommodation until 31 March 2027. Current guidance states that the reduced 5% rate is due to apply from 1 April 2027.
Check that every quote has treated VAT consistently, especially if your proposed installation date approaches that change.
Compare batteries separately
Battery storage can make quotations particularly difficult to compare.
A quote described as “solar plus battery” tells you very little without the battery specification.
Check:
usable capacity in kWh
maximum charge and discharge power
warranty period
cycle or throughput conditions
backup capability
compatible inverter
monitoring system
Ask for a solar-only price and a solar-plus-battery price where possible. This makes the additional cost of storage clear.
It also lets you decide whether the battery provides enough benefit for your household rather than accepting it as part of a package.
Check MCS credentials and consumer protection
Where MCS certification applies, verify the actual company carrying out or taking responsibility for the installation.
The MCS-certified solar installers guide explains this process in more detail.
MCS describes itself as the UK’s quality mark for small-scale renewable technologies and requires certified installers to follow its Customer Commitment. Among other requirements, this covers clear quotations, appropriate system information, transparent pricing, deposit arrangements and handover documentation.
Your quote should also explain who handles any required notification or approval from your Distribution Network Operator, or DNO.
Do not assume this work is included simply because the proposal says “fully installed”.
Compare warranties carefully
A quotation stating “25-year warranty” may sound reassuring, but several different warranties can apply to one solar system.
These can include:
solar panel product warranty
panel performance warranty
inverter warranty
battery warranty
workmanship warranty
insurance-backed protection
Check who provides each warranty and what happens if either the installer or manufacturer stops trading.
Also check whether servicing, online registration or other conditions are required to maintain cover.
How much should solar panel quotes cost?
There is no single correct price because every property and system differs.
The Energy Saving Trust currently gives a typical home solar PV installation cost of around £7,600. Actual quotations can be higher or lower depending on system capacity, equipment, roof access and additional work.
| Factor | Likely effect on quotation |
|---|---|
| Larger solar array | Higher upfront cost but greater generating capacity |
| Premium panels | Usually increases equipment cost |
| Battery storage | Adds substantial equipment and installation cost |
| Complex roof | Can increase labour and mounting costs |
| Significant shading | May change system design and equipment choice |
| Electrical upgrades | Can add to installation cost |
| Difficult access | Can increase scaffolding or labour costs |
For that reason, a national “average price” should only be used as a sense check. A survey and written specification are needed for meaningful comparison.
How to compare solar panel quotes step by step
1. Get several written quotations.
Three comparable proposals will usually give you a much clearer view of the market than accepting the first price.
2. Put every system on the same basis.
Write down the kWp, panel models, inverter, battery capacity and annual-generation estimate.
3. Identify missing items.
Ask whether scaffolding, electrical upgrades, network applications and certification are included.
4. Compare performance assumptions.
Question unusually high generation or savings projections.
5. Review warranties.
Separate panel, inverter, battery and workmanship protection.
6. Check the installer.
Confirm company details, relevant certification and who will actually carry out the work.
7. Read payment terms.
MCS says deposits taken by certified installers should be reasonable, justified and part of an agreed payment schedule, with customers told how the deposit is protected.
8. Compare lifetime value rather than the lowest price.
Consider system output, equipment quality, warranties, installer support and overall cost together.
What about export payments?
If you export surplus solar electricity, you may qualify for a Smart Export Guarantee tariff.
Ofgem explains that participating suppliers determine their own SEG rates, contract lengths and terms, although eligible tariffs must pay more than zero. Homeowners can shop around and do not necessarily need to use their existing electricity supplier.
This matters when comparing quotations that include projected savings.
An installer may model future export income using a particular tariff. Treat that as an assumption, not a guaranteed return, because tariffs can change.
Solar panel quote red flags
Be cautious if a proposal:
does not identify panel or inverter models
gives savings without showing generation assumptions
omits important installation costs
uses vague warranty wording
pressures you to sign immediately
cannot explain unusually high generation figures
leaves responsibility for DNO or certification unclear
asks you to rely primarily on projected financial returns
A professional proposal should make it easier to understand your purchase, not harder.
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Getting around three written quotations is a practical starting point. It gives you enough information to identify unusually high or low prices and compare different system designs.
Not automatically. Compare system capacity, equipment, estimated generation, installation scope, warranties and installer credentials alongside price.
It should clearly identify the system size, panels, inverter, estimated performance, installation work, price, payment terms and applicable warranties.
Compare total capacity in kWp, expected annual generation in kWh and the total installed price. Price per kWp can provide an additional sense check.
Differences can come from system size, equipment brands, roof complexity, scaffolding, electrical work, battery storage, installer overheads and system design.
Kilowatt peak, or kWp, measures the rated maximum capacity of a solar array under standard test conditions.
Yes. A useful quotation should explain estimated annual electricity generation and the assumptions used to calculate it.
Treat them as projections rather than guarantees. Electricity prices, export tariffs, weather and your household electricity use can all change.
Qualifying installed solar panels in residential accommodation currently benefit from 0% VAT. HMRC states the temporary zero rate runs until 31 March 2027 under current guidance.
The quotation should make clear whether scaffolding is included. If it is excluded, ask for the expected additional cost before comparing prices.
Yes. Compare usable capacity, power, warranty, backup capability and additional installed cost rather than treating all batteries as equivalent.
An MCS-certified installer is a business certified under the Microgeneration Certification Scheme for relevant low-carbon technologies. MCS also sets consumer-protection requirements for participating installers.
It is a manufacturer's commitment regarding how much of the panel's original rated performance it should retain over a stated period. It is different from the product warranty.
Eligible systems in Great Britain may receive export payments through the Smart Export Guarantee. Rates and terms vary between participating suppliers.
Sign only when you understand the specification, final price, payment terms, performance estimate, warranties, installation responsibilities and cancellation terms.
Which solar panel quote should you choose?
The right quote is the one that offers the most suitable complete system for your home at a reasonable price.
Do not judge quotations on cost alone.
Make sure you understand what is being installed, how much electricity it is expected to generate, which work is included, who is responsible for the installation and what protection you receive afterwards.
Once the proposals are genuinely like-for-like, price becomes far more meaningful.
If you are ready to gather comparable options, you can compare solar panel installation quotes and review the specification, cost and warranty before deciding whether to proceed.
