What Is HIES? Understanding Solar Panel Consumer Protection
HIES is a UK consumer protection scheme designed to help homeowners make informed decisions when purchasing solar panels and other renewable energy systems. If you are comparing solar panel installers, understanding what HIES membership offers can help you assess the protection available before signing a contract.
HIES stands for Home Insulation & Energy Systems Quality Assured Contractors Scheme. Its focus is consumer protection rather than simply the technical design or installation of a solar PV system.
Depending on the scheme rules and the protection applicable to your contract, HIES membership can provide access to safeguards such as deposit protection, insurance-backed guarantees and independent dispute resolution.
For homeowners, the important question is not just whether an installer belongs to a recognised scheme, but exactly what protection applies to their installation, payments and workmanship.
In this guide, we explain what HIES is, how the scheme works, what an insurance-backed guarantee covers and what to check before choosing a HIES member solar installer.
How Does the HIES Scheme Work?
The HIES scheme is designed to provide consumer protection when homeowners purchase eligible renewable energy and home improvement installations from participating members.
Rather than focusing solely on the equipment being installed, the scheme considers the customer experience, contractual arrangements and the protections available if something goes wrong.
When comparing HIES member solar panel installers, homeowners should look at the following areas:
- Consumer code: The standards and rules that members must follow when dealing with customers, including sales practices and contract transparency.
- Deposit protection: Whether money paid before installation is covered, and the applicable limits, exclusions and protection period.
- Insurance-backed guarantees: Whether qualifying workmanship guarantees are supported by an insurance policy if the installer ceases trading.
- Complaints and dispute resolution: The process available if a problem cannot be resolved directly with the installer.
- Customer support: The advice and assistance available if you have questions about your contract or installation.
HIES membership should be considered alongside other checks, including MCS certification, electrical qualifications, written warranties and the installer’s track record.
Before signing a contract, ask the installer to explain which protections apply to your particular installation and request copies of the relevant terms and certificates.
How Does HIES Protect Homeowners?
Choosing a HIES registered solar panel installers means you’re protected throughout the entire buying journey.
Deposit Protection
One of the biggest concerns when purchasing solar panels is paying a deposit before work begins. HIES provides protection for qualifying deposits, giving homeowners reassurance that their money is safeguarded should unexpected circumstances arise.
Alternative Dispute Resolution
Although reputable installers rarely experience disputes, HIES provides an independent dispute resolution service if problems cannot be resolved directly. This gives homeowners confidence that there is an impartial process available without immediately resorting to expensive legal action.
Strict Code of Conduct
Insurance Backed Guarantees
A quality solar panel warranty should last many years. If an installer ceases trading during the guarantee periods, an insurance backed guarantee may continue to provide protection for qualifying workmanship warranties. This offers reassurance that your investment remains protected beyond the installer’s trading lifetime.
Every HIES member agrees to follow a comprehensive consumer code covering:
- Honest marketing
- Transparent pricing
- Professional conduct
- Fair contracts
- Accurate technical advice
- Customer care
This helps ensure homeowners receive clear, trustworthy information before making a purchasing decision.
What Is a HIES Insurance-Backed Guarantee?
An insurance-backed guarantee (IBG) is designed to provide additional protection for eligible workmanship guarantees if the installer ceases trading and can no longer honour its obligations.
This is particularly relevant when buying solar panels because the installation may remain in place for decades, long after the original installation company has stopped operating.
However, an insurance-backed guarantee is not the same as a manufacturer’s product warranty or a performance warranty.
- Workmanship guarantee: Covers qualifying defects relating to the installation, subject to its terms.
- Solar panel product warranty: Covers specified manufacturing defects under the manufacturer’s warranty conditions.
- Solar panel performance warranty: Sets out the manufacturer’s guaranteed minimum performance over a defined period.
An insurance-backed guarantee does not automatically extend every warranty or cover every possible fault. Its protection depends on the policy wording, the underlying guarantee, eligibility requirements and any exclusions.
Before committing to a solar installation, ask your installer:
- Is an insurance-backed guarantee included in my quotation?
- Which workmanship guarantee does it support?
- When does the insurance cover begin, and how long does it last?
- What exclusions, claim conditions and limits apply?
- Will I receive a certificate confirming the cover?
Always retain your contract, workmanship guarantee and insurance-backed guarantee documentation. These documents will help you understand what protection is available if you need to make a claim in the future.
HIES vs MCS – What’s the Difference?
Many homeowners mistakenly believe HIES and MCS are the same accreditation. They actually perform very different roles.
| HIES | MCS |
| Consumer protection | Technical certification |
| Deposit protection | Installation standards |
| Insurance backed guarantees | Product standards |
| Dispute resolution | Required for Smart Export Guarantee |
| Consumer code | System performance assurance |
The best solar companies often hold both accreditations because they demonstrate excellence in different areas. At SolarTherm UK, we believe homeowners deserve both technical quality and comprehensive consumer protection.
Why MCS Still Matters
While HIES protects the customer, MCS protects the quality of the installation. An MCS certified installation demonstrates that:
- Products meet recognised industry standards
- Installers follow approved installation methods
- Systems are correctly designed
- Performance calculations follow recognised methodologies
Perhaps most importantly, MCS certification is generation required if you want to receive payments through the Smart Export Guarantee (SEG). Without MCS certification, many electricity suppliers will not allow homeowners to export surplus electricity back to the grid for payment. This is why choosing an MCS certified solar panel installer is essential.
What Makes a Trustworthy Solar Company?
Not all solar companies offer the same level of expertise or customer protection. When comparing quotations, homeowners should look beyond price and consider:
- Industry Accreditations: look for installers who hold recognised certifications including MCS certification, HIES membership, NICEIC certification and EPVS membership. These demonstrate commitment to quality, safety and consumer protection.
- Experience: an experienced installer will understand roof types, electrical regulations, battery storage, local planning requirements, DNO applications and long term system performance. Experience helps avoid costly mistakes and ensures your system performs efficiently for many years.
- Clear Warranties: ask every installer exactly what is covered by their solar panel warranty. A typical installation may include separate warranties for solar panels, inverter, battery storage and workmanship. Understanding these differences helps avoid confusion later.
- Transparent Quotations: professional installers should provide quotations that clearly explain equipment specifications, expected generation, installation costs, warranty information and aftercare support. Avoid companies that rely on pressure selling tactics or unrealistic savings claims.
Why Consumer Protection is More Important Than Ever
The UK solar market continues to grow rapidly. While this is great news for homeowners, it has also led to an increase in new installers entering the market. Most provide excellent service, but choosing an installer based purely on the cheapest quotation can sometimes prove costly.
Consumer protection schemes such as HIES help raise standards across the industry by requiring members to follow strict rules that prioritise customer satisfaction.
Why Homeowners Across the South East Choose SolarTherm UK
At SolarTherm UK, we understand that installing solar panels is a long term investment. That’s why we focus on delivering both technical excellence and outstanding customer care.
Homeowners across Essex, Kent, Suffolk, Hertfordshire and the wider South East and East Anglia choose SolarTherm UK because we offer:
- Experienced solar design specialists
- High quality solar PV systems
- MCS certified installations
- NICEIC approved electrical work
- HIES consumer protection
- Clear, transparent quotations
- Comprehensive aftercare support
Our goal isn’t simply to install solar panels – it is to build systems that deliver reliable performance and long term value while ensuring every customer feels confident throughout the process.
Why Expertise and Trust Matter
At SolarTherm UK, we don’t believe in generic advice copied from manufacturers. Our guidance is based on real world installation experience across thousands of residential properties throughout the South East and East Anglia.
Our team regularly advises homeowners on:
- Choosing the right solar PV system
- Understanding solar panel warranty options
- Comparing reputable solar companies
- Selecting trusted solar panel installers
- Navigating MCS certification and consumer protection schemes
By combining technical expertise with recognised industry accreditations, we help homeowners make informed decisions backed by professional knowledge and practical experience.
Conclusion
Choosing solar panels isn’t just about finding the cheapest quote. It’s about selecting an installer that offers quality workmanship, recognised technical standards and strong consumer protection.
By choosing HIES and MCS certified solar panel installers, homeowners benefit from higher installation standards, greater financial protection and long term peace of mind.
At SolarTherm UK, we’re proud to provide both exceptional installations and the reassurance that comes from recognised industry accreditations – helping homeowners across Essex, Kent, Suffolk, Hertfordshire and the wider South East and East Anglia invest in solar with confidence.
Contact SolarTherm UK today for a free, no obligation quote and design, tailored to your property, usage and future energy needs. No hard sell, just honest, expert advice – and the time you need to make an informed decision.
Your home. Your energy. Your future.
Frequently Asked Questions
HIES stands for Home Insulation & Energy Systems Quality Assured Contractors Scheme, a UK consumer protection organisation for renewable energy installations.
No. HIES focuses on consumer protection, while MCS certifies the technical quality of products and installations. Together they provide comprehensive reassurance for homeowners.
HIES can provide insurance-backed guarantees for qualifying workmanship warranties if your installer ceases trading, subject to the terms of the scheme.
Yes. Choosing HIES-accredited installers provides additional consumer protection, transparent contracts and access to dispute resolution alongside professional installation standards.
SolarTherm UK combines technical expertise, recognised industry accreditations, transparent advice and high-quality workmanship to deliver reliable solar installations for homeowners across Kent, Essex, Suffolk, Hertfordshire, East Anglia and the wider South East.
The HIES consumer code sets out standards that participating members must follow when dealing with consumers. It relates to areas such as fair sales practices, transparent contracts and customer service. If you are considering a HIES member solar installer, ask for details of the applicable code and how to raise a complaint if a problem arises.
HIES-related insurance-backed guarantees may provide protection for eligible workmanship guarantees, subject to the applicable scheme rules and insurance policy. They are not a blanket guarantee covering every component or fault in a solar PV system. Always check the certificate, policy terms, exclusions and duration of cover before signing your contract.
