With electricity prices remaining unpredictable as we move into 2026, more homeowners and businesses across the South East are investing in solar panels to take control of their energy costs.
However, the performance of your solar PV system depends just as much on the installer as it does on the equipment itself. Choosing the right company ensures your system is compliant, correctly sized for your property and designed to maximise long term savings.
In this guide, you’ll learn why research and due diligence matter, key warning signs to avoid, what the installation process should look like and how to compare quotes properly.
Understand Your Solar Panel Options First
Before contacting installers, it’s important to understand the basics of solar PV technology. There are different types of solar panels (such as monocrystalline and polycrystalline), varying efficiency ratings and different inverter systems. Some properties in the South East – particularly in coastal or exposed areas – may require specific mounting solutions due to wind loading or roof design.
Consider available roof space and your roof orientation and pitch. Check if there’s any shading issues from nearby trees and buildings, trim back any trees you can before your install, to prevent unnecessary specialist system costs (microinverters or power optimised systems that are used for properties experiencing mild shading).
Decide the type of system you want – solar PV only or solar PV and battery storage. Having a baseline understanding allows you to assess whether an installer is recommending a system that genuinely suits your property – rather than oversizing or undersizing it.
Choose a Local Installer
Working with a regional installer offers clear advantages. A South East based solar company will understand local planning considerations and grid connection processes with your local DNO. Choosing local means knowledge of weather patterns and property styles.
Local installers can also respond faster for surveys, scaffolding and post-installation support. If anything needs adjusting or servicing, you’re not waiting on a national call centre.
When researching installers:
- Search using “solar installers near me”
- Ask neighbours or local businesses for recommendations
- Review recent local installations
- Check Trustpilot and Google Reviews
- Check Companies House to see how long they have been in business
Always Get Multiple Quotes (And Don’t Necessarily Go With The Cheapest)
You should obtain at least three quotes before committing. Each quote should clearly outline:
- System size (kWp)
- Panel and inverter brand
- Estimated annual generation (kWh)
- Total cost breakdown
- Warranty details
- Installation timeframe
Avoid focusing solely on the lowest price. In solar, quality of installation directly affects output and longevity. Slightly higher upfront investment often delivers better long term return on investment (ROI).
Verify Certifications and Credentials
In the UK, installer accreditation is essential to ensure your system is being installed by a qualified and experienced installer.
Ensure your chosen company is registered under the Microgeneration Certification Scheme (MCS) as a minimum, MCS certification ensures you qualify for the Smart Export Guarantee (SEG), allowing you to be paid for any surplus electricity you export to the grid. RECC (Renewable Energy Consumer Code) or HIES (Home Insulation and Energy Systems Quality Assured Contractors Scheme) membership is also good for your installer to have as this further guarantees a high standard of installation.
Installers who are members of EPVS (Energy Performance Verification Scheme) have their performance and return on investment estimates verified by an independent third party for accuracy before you receive them, meaning your quote is not over-inflated and your system should perform as estimated in your quote.
Check Reviews and Local Reputation
Independent reviews give insight into real world performance. Look at Google Reviews, Trustpilot and social media feedback. Paying close attention to what is said about installation quality, communication standards, aftercare and responsiveness and how complaints are handled.
Consistent praise for workmanship and support is a strong indicator of reliability. Repeated complaints about delays or poor communication should raise concerns.
Compare Warranty Coverage
Solar is a long term investment – warranties matter. Most systems include:
- Product warranty (typically 10-25 years)
- Performance warranty (typically 25 years guaranteeing output retention)
- Workmanship warranty (this varies installer to installer)
- Inverter warranty (typically 5-10 years)
- Battery warranty (typically 5-10 years)
A reputable installer should clearly explain what is covered, who underwrites each warranty and how claims are handled. Look out for installers who have HIES back warranty protection as an added insurance for your investment.
Check Grant and Finance Options
Some households may qualify for government backed schemes such as ECO4 (which is ending in March 2026). Eligibility is typically income or benefit dependent and you apply through your energy supplier.
If grants are not available, you may explore solar finance plans, Green Energy Loans or installer backed payment plans. Always calculate total cost including interest when comparing finance products.
Confirm Compliance and Quality Control
Your installer should explain:
- Electrical certification procedures
- DNO application process
- Building Regulations compliance
- Final handover documentation
Ask whether installations are internally audited. A structured quality assurance process indicates professionalism.
Ask Detailed Questions
A professional installer should welcome technical questions. Clarify installation timeline and scaffolding arrangements. Ask who is responsible for applying for grid approval and completing relevant paperwork. Ensure your system is compatible for battery storage in the future if you’re not installing at the same time. Ask about ongoing support and maintenance. Clear, transparent communication is a hallmark of a reputable company.
Common Red Flags to Avoid
Be cautious if you encounter:
Unrealistic Pricing
Significantly lower quotes may indicate inferior components, rushed installation or additional costs further down the line.
High Pressure Sales Tactics
You should never feel rushed into signing a contract.
Overstated Savings Claims
Savings will depend on usage patters, system size and tariff structure. Choose an installer that is an EPVS member to ensure your estimates are accurate.
Lack of Certification
No MCS, RECC or HIES membership is a serious warning sign.
Large Upfront Payment Demands
Reasonable deposits are standard, but excessive upfront fees are concerning. MCS guidelines state no more than 25% of the total cost should be paid upfront.
What to Expect From a Professional Local Installation
While processes will vary between companies, a structured installation journey should include:
- Initial consultation and quotation
- On site technical survey
- DNO application submission
- Agreed installation date
- Scaffolding erection (typically 1-2 days prior)
- Installation (typically 1-2 days)
- Testing, commissioning and certification
- Handover documentation and monitoring setup
A competent team will work efficiently while prioritising safety and system optimisation.
The Bottom Line
Choosing a solar installer in the South East requires more than comparing prices. You should evaluate credentials, experience, reputation and long term support capability.
A properly installed solar PV system should operate reliably for 30 years or more. Taking time to choose the right installer protects your investment and ensures your system delivers the financial and environmental returns you expect.
If you’re considering solar panels in the South East, 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.
FAQs
How long does installation take?
Most residential systems are completed within 1–2 working days.
How much do solar panels cost in the South East?
Costs vary depending on system size, roof complexity and battery inclusion. A tailored quote provides accurate figures.
Do I need planning permission?
In most cases, solar panels fall under permitted development. Exceptions may apply for listed buildings or conservation areas.
Can I install solar panels myself?
DIY installation is not recommended and will not qualify for MCS certification or SEG payments.
How do I know if my roof is suitable?
A technical survey will assess orientation, structure, shading and available space
Do solar panels require maintenance?
Solar systems require minimal maintenance, though periodic inspection and inverter checks are advised.
