Answer: Choose a UK solar installer by comparing a roof-specific design, itemized price, certification, contract protection and aftercare. Sunsave, Octopus and Heatable offer different purchasing and service routes, but a brand name or review score does not establish the best fit for your home. Confirm postcode coverage, the contracting company and the documents needed by your chosen export-payment supplier before signing.
Choose a shortlist that can serve your postcode and demonstrate how its offer fits your roof, electricity use and purchasing preference. Then compare written designs and contracts. A table of company names is useful for starting that process; it cannot establish that one installer is best for every household.
SurgePV publishes this guide and sells solar software. Provider information and official sources were checked on September 30, 2026. The comparison below uses vendor-reported offers, not firsthand installation testing, independently verified customer scores or a ranked league table.
UK Solar Installer Offers to Compare
| Provider | Documented route | What to confirm in your quote |
|---|---|---|
| Sunsave Plus | No-upfront-cost finance, ownership from day one and a service guarantee | Total payments, loan and service terms, eligibility and early-settlement consequences |
| Octopus | Postcode-led estimate followed by a tailored solar quote; export-tariff support | Actual availability, equipment, installation scope and applicable tariff requirements |
| Heatable | Online solar quoting with a stated five-year insurance-backed installation warranty | Final access/scaffolding price, legal installer and the applicable warranty policy |
| Local installer | A separate option to investigate using the same brief | Documentary evidence for its proposed design, contract and service offer |
The first three rows summarize the providers’ own published information. They are examples to evaluate, not endorsements or evidence that an omitted company is unsuitable. Verify the offer again before signing because equipment, coverage and terms can change.
Sunsave Plus: Compare the Credit and Service Contract
Sunsave Plus states that the homeowner owns the system from day one. Its offer combines finance with monitoring and maintenance, rather than a roof lease. The published guarantee runs for twenty years, subject to its terms.
Its representative example lists 240 monthly payments of £69, totaling £16,560. That is a particular finance example, not a cash installation price or a nationwide cost benchmark. Read the quote’s split between credit and service fees, interest, eligibility and exclusions. The page states that full loan settlement ends the guarantee; ask how settlement and a house sale affect your actual agreement.
Octopus: Check the Postcode, Design and Tariff Together
Octopus’s solar page starts with postcode availability and estimated cost, followed by a tailored quote. It describes installation and export-tariff support.
Ask for your proposed equipment, battery operating strategy and complete installation scope in writing. If the offer references a battery tariff, verify its current compatibility and eligibility separately. The company’s general energy-service reviews cannot establish the quality of your local solar installation team. Confirm the relevant warranty documents rather than importing a duration from an old comparison article.
Heatable: Resolve Access Costs Before Comparing Prices
Heatable’s solar page advertises a five-year insurance-backed installation warranty. Its access-cost wording needs a written clarification: an installation section lists scaffolding, while its ### Who are the best solar panel installers in the UK?
The best fit depends on your roof, location, purchasing route and service requirements. This guide compares documented offers from Sunsave, Octopus and Heatable alongside checks you can apply to local installers. It does not assign unsupported rankings or treat general energy-company reviews as evidence of solar installation quality.
Is MCS certification essential for a UK solar installer?
Verify certification for the actual company and installation. Ofgem guidance for solar PV up to 50 kW recognizes MCS and potentially equivalent certification; ask your chosen SEG supplier which evidence it accepts. Certification does not by itself establish the VAT treatment, export-payment approval or suitability of a particular roof design.
How much does a 4 kW solar system cost in the UK?
Obtain itemized quotes for your roof and specified equipment. Compare scaffolding, electrical work, battery scope, permissions, commissioning and tax treatment. A promotional starting price or financing example is not a verified nationwide installed-system average. Compare cash price and total finance payments separately.
What warranties should a UK solar installer offer?
Separate workmanship, module product, module performance, inverter and battery warranties. Ask who handles claims and pays for access, labor, shipping and replacement. A long performance warranty is not equivalent to comprehensive installation cover; read exclusions, transferability and the arrangements if the installer stops trading.
How many quotes should I get for solar panels?
As a practical comparison exercise, request three written quotes using the same design brief where providers are available. Align equipment, capacity, modeled production, access and aftercare before comparing price. Three is an editorial buying suggestion, not a legal requirement or proof of a fixed percentage saving.
Can a solar installer ask for a deposit above 25 percent?
Check the contract and the applicable consumer code. RECC limits its members’ deposits to 25 percent and applies separate conditions to later advance payments. Do not apply that specific rule automatically to every protection scheme, or mistake a compliant deposit for proof that a company and its cover have been independently verified.
Does the Smart Export Guarantee cover the whole UK?
SEG is a Great Britain scheme for eligible metered exports; do not assume its rules apply to Northern Ireland. Your export-payment supplier can differ from your import supplier. Installation completion alone does not start payments: confirm the supplier’s certification, metering, application and contract requirements.
Should I choose a local or national solar installer?
Compare the named contracting company, people responsible for survey and installation, written service coverage and aftercare terms. Ask who will attend a fault and how you will escalate a complaint. National size and local proximity do not automatically prove faster service, better design or stronger warranty protection. says the online quote excludes scaffolding until access has been assessed.
Ask which figure is preliminary and obtain the final price with scaffolding, roof access and any exclusions identified. Read the actual insurance-backed policy for eligibility and claims. A warranty advertised for another service, such as boiler installation, should not be applied to a solar contract.
Give Every Installer the Same Design Brief
Include your postcode, roof photographs or survey information, electricity bills and any available interval consumption data. Explain expected changes such as an EV, heat pump or different working hours. Specify whether the objective is lower annual electricity costs, export income, backup or a combination.
Request a proposal that separates these quantities:
| Item | Why the distinction matters |
|---|---|
| Module DC capacity in kWp | Different from inverter AC power and annual electricity production |
| Annual production in kWh | A modeled estimate with weather, shading and loss assumptions |
| Household self-consumption | The share used onsite, requiring a consumption profile or stated assumption |
| Grid exports | Electricity exported, rather than all electricity generated |
| Battery usable energy and power | Different measures of duration and the load the system can support |
| Backup functionality | Requires the actual operating mode, supported circuits and electrical arrangements |
A battery in the equipment list is not enough to establish that the house stays powered during a grid outage. Ask which circuits operate, what happens when stored energy is exhausted and what the proposed equipment supports.
The installer should explain the roof layout, shading assessment, equipment choices and estimated losses. If two offers use different consumption assumptions, equipment or roof areas, their projected savings are not a like-for-like comparison. The design should also identify any roof, structural, electrical, planning or connection issues requiring further assessment.
Verify the Company and Certification
Record the exact contracting company, registered address, certification identity and the technology covered. Check the current official register and ensure the name matches the proposal. Logos and an old review article are not evidence that a particular legal entity has current certification for your installation.
Ofgem’s generator guidance linked from its current SEG guidance page says solar PV installations up to 50 kW need suitable installer and installation certification. It recognizes MCS and potentially equivalent schemes; the chosen supplier should explain which documents it accepts. The guidance also specifies metered exports, a meter capable of half-hourly measurements and an export MPAN.
Confirm this route before agreeing to a certification alternative. Do not assume a provider’s logo automatically proves acceptance by every export-payment supplier. Our MCS certification guide explains the separate documentation workflow.
Separate VAT Eligibility From Certification
HMRC Notice 708/6 describes zero-rated eligible installations of energy-saving materials in residential accommodation and relevant charitable buildings through March 31, 2027, with a scheduled return to the reduced rate from April 1. Eligibility depends on the supply and circumstances, not simply possession of an MCS certificate.
Installation with materials supplied by the installer differs from a goods-only purchase. Ask the contractor to state the basis for the invoice’s VAT treatment, particularly where the quote includes additional works. Verify the rules again for the actual supply date rather than assuming every solar-related purchase is zero-rated.
Check Deposits, Protection and Payment Milestones
The RECC consumer code limits its members’ deposits to 25% of the total contract price. Later advance payments have separate conditions: deposits plus advances must not exceed 60%, and advances are restricted to the specified period before agreed goods delivery. The code also sets a minimum two-year workmanship guarantee for its members.
These are RECC-member rules, not a universal description of every protection scheme. Ask the company to identify the code and cover that apply, provide protection documentation and explain the actual payment milestones. Check who protects the money, what events trigger a claim and how cover applies if the installer stops trading.
Do not transfer funds based only on a telephone promise. Keep the signed scope, final price, payment schedule and confirmation of any agreed changes together.
Compare Warranties by What They Cover
Create a separate row for installation workmanship, panel product defects, panel performance, inverter and battery cover. A panel performance warranty does not automatically cover a roof leak, failed inverter or the labor needed to replace a module.
For each warranty, record:
- The party responsible for accepting and resolving the claim.
- Duration, exclusions and any maintenance or monitoring requirements.
- Whether access, scaffolding, labor, shipping and disposal are included.
- Transfer conditions if you sell the property.
- The fallback arrangement if the installation company ceases trading.
Ask for a written fault-reporting process and the service area. A national brand is not proof of faster attendance; a local address is not proof of stronger financial protection. Assess the arrangements offered for your property.
Confirm the Export-Payment Handoff
The Smart Export Guarantee generator page describes payments for eligible exports in Great Britain. Your export supplier can differ from your import supplier, and suppliers set their own offers within the scheme’s requirements. Northern Ireland needs a separate check of the relevant local arrangements.
Before installation, agree who handles the certification documents, connection paperwork, export metering and supplier application. Ask when each item will be delivered and which steps remain your responsibility. A completed installation is not automatically an accepted export-payment contract.
Compare export terms with import charges and your expected operating pattern. A higher headline export rate is not necessarily the lowest overall electricity cost, especially where eligibility depends on other products or tariffs.
A Quote-Comparison Record You Can Copy
| Check | Quote A | Quote B | Quote C |
|---|---|---|---|
| Contracting company and postcode availability | |||
| Survey findings and unresolved roof issues | |||
| Exact modules, inverter, battery and proposed layout | |||
| Modeled production, shading and consumption assumptions | |||
| Final price, access costs, exclusions and VAT basis | |||
| Cash price versus total finance and service payments | |||
| Certification and chosen export supplier’s evidence | |||
| Connection, commissioning and handover responsibilities | |||
| Deposit, payment milestones and consumer protection | |||
| Warranty boundaries and fault-response process |
Request three written quotes where feasible, using the same brief. This is a practical comparison suggestion, not a rule that guarantees a particular saving. Resolve blank or conflicting fields before choosing an installer.
For solar professionals preparing proposals, keep survey findings and production assumptions visible alongside the commercial offer. Evaluate solar proposal software against that workflow; book a SurgePV demonstration if you want to assess how it fits your team.
Frequently Asked Questions
Who are the best solar panel installers in the UK?
The best fit depends on your roof, location, purchasing route and service requirements. This guide compares documented offers from Sunsave, Octopus and Heatable alongside checks you can apply to local installers. It does not assign unsupported rankings or treat general energy-company reviews as evidence of solar installation quality.
Is MCS certification essential for a UK solar installer?
Verify certification for the actual company and installation. Ofgem guidance for solar PV up to 50 kW recognizes MCS and potentially equivalent certification; ask your chosen SEG supplier which evidence it accepts. Certification does not by itself establish the VAT treatment, export-payment approval or suitability of a particular roof design.
How much does a 4 kW solar system cost in the UK?
Obtain itemized quotes for your roof and specified equipment. Compare scaffolding, electrical work, battery scope, permissions, commissioning and tax treatment. A promotional starting price or financing example is not a verified nationwide installed-system average. Compare cash price and total finance payments separately.
What warranties should a UK solar installer offer?
Separate workmanship, module product, module performance, inverter and battery warranties. Ask who handles claims and pays for access, labor, shipping and replacement. A long performance warranty is not equivalent to comprehensive installation cover; read exclusions, transferability and the arrangements if the installer stops trading.
How many quotes should I get for solar panels?
As a practical comparison exercise, request three written quotes using the same design brief where providers are available. Align equipment, capacity, modeled production, access and aftercare before comparing price. Three is an editorial buying suggestion, not a legal requirement or proof of a fixed percentage saving.
Can a solar installer ask for a deposit above 25 percent?
Check the contract and the applicable consumer code. RECC limits its members’ deposits to 25 percent and applies separate conditions to later advance payments. Do not apply that specific rule automatically to every protection scheme, or mistake a compliant deposit for proof that a company and its cover have been independently verified.
Does the Smart Export Guarantee cover the whole UK?
SEG is a Great Britain scheme for eligible metered exports; do not assume its rules apply to Northern Ireland. Your export-payment supplier can differ from your import supplier. Installation completion alone does not start payments: confirm the supplier’s certification, metering, application and contract requirements.
Should I choose a local or national solar installer?
Compare the named contracting company, people responsible for survey and installation, written service coverage and aftercare terms. Ask who will attend a fault and how you will escalate a complaint. National size and local proximity do not automatically prove faster service, better design or stronger warranty protection.
Where this fits
This article is part of SurgePV's Solar Installation hub, which works through the topic from first principles to the decisions a project team actually has to make.
