Right, so you’ve decided to go solar. Brilliant. But now comes the tricky bit – actually finding someone to install the damn things without getting ripped off or landed with a cowboy outfit that disappears after six months.
There’s literally thousands of MCS-certified installers out there. And honestly? A lot of them are perfectly decent. But some are definitely better than others, and that’s what we’re here to sort out.
I’ve spent way too long trawling through reviews, checking accreditations, and comparing what these companies actually offer. Here’s what I reckon are the 10 best solar installers in the UK right now.
How I Picked These Companies
Before we dive in, quick note on my criteria. I looked at:
- Customer reviews on Trustpilot, Google, Which?, etc.
- Accreditations – MCS certification is the bare minimum, but HIES, NAPIT, and others matter too
- Warranties – both product and workmanship
- Panel brands they work with
- How long they’ve been around (too many solar companies go bust)
- Transparency – are they upfront about pricing?
- Geographic coverage
Right, let’s get into it.
1. Project Solar UK
Best for: Long warranties and premium panels
Project Solar’s the big name in UK solar, and for good reason. They’ve installed over 45,000 solar panels since starting in 2011, which is… a lot.
What They Offer
Project Solar provides lifetime warranties on their solar panels and installations, which is basically unheard of in the industry. The catch? It only applies if everything’s installed and maintained properly, and doesn’t cover removal or shipping of faulty panels. Still, it’s a bold promise.
They guarantee baseline output of 85% after 25 years and 80% after 30 years, which takes into account the natural degradation of panels over time.
Panel brands: SunPower Maxeon, Panasonic, AIKO – basically the top-tier stuff. Their own Project Solar Evo Maxima 490W panels are also excellent.
Coverage: Pretty much nationwide, operating from offices in the Northwest and Midlands.
The Downsides
They’re not cheap. You’re paying for premium panels and that lifetime warranty. If budget’s tight, there are more affordable options on this list.
Project Solar has received multiple awards including “Company of the Year” and “European Installer of the Year”, so they know they’re good and price accordingly.
Trustpilot: Around 4.7/5 stars Best for: People who want the absolute best and aren’t too worried about cost
2. Solar4Good
Best for: Customer service and quick turnaround
Solar4Good was only founded in 2020 but has quickly built a reputation for efficient, reliable installations, completing around 1,500 projects annually.
What They Offer
They have an impressive 4.8 stars on Trustpilot with 91% of reviews being five stars. Their customer service team gets mentioned constantly in positive reviews.
Solar4Good offers three customisable residential packages, with prices ranging from £5,500 for 10 panels to over £9,000 for 16 panels and 8.7kWh battery storage.
Panel brands: JA Solar, Jinko, Trina Solar, Qcells, Fox ESS
One thing that stands out – they can turn around quotes to installation in as little as two weeks, which is mad fast compared to most installers.
They also offer a Price Match Guarantee, so if you find a like-for-like quote cheaper elsewhere, they’ll match it.
The Downsides
Being a newer company, Solar4Good doesn’t have a long-term track record. That’s not necessarily a red flag, but when you’re making a 25-year investment, some people prefer companies with more history.
Trustpilot: 4.8/5 stars Best for: People who value excellent customer service and want things sorted quickly
3. Heatable
Best for: Online quotes and transparent pricing
Heatable was launched in 2017 and has a customer rating of 4.8 based on over 7,000 customer reviews.
What They Offer
Here’s what makes Heatable different – they do everything online. No pushy sales reps turning up at your door trying to pressure you into signing on the spot.
They offer online, fixed-price quotes, meaning you can avoid the hard sell and aggressive sales tactics. You answer some questions online and get an instant price. Simple.
Heatable exclusively installs REA Fusion panels with a 25-year warranty, paired with Enphase Microinverters to maximise efficiency.
Accreditations: MCS, Which? Trusted Traders, HIES, NAPIT
Their solar panel system is optimised for low-light conditions, ideal for the UK – which is actually pretty important given our weather.
Heatable differentiates itself by purchasing directly from manufacturers, ensuring competitive pricing without middlemen. That’s why their prices are generally lower than companies using sales reps on commission.
The Downsides
Limited panel choice – you’re getting REA Fusion panels and that’s it. If you specifically want SunPower or another brand, look elsewhere.
They offer a 25-year warranty on panels and a two-year workmanship warranty, which is decent but the workmanship warranty’s shorter than some competitors.
Trustpilot: 4.8/5 stars Best for: People who hate sales pressure and want transparent, fixed pricing
4. Geo Green Power
Best for: Commercial projects and comprehensive renewables
Geo Green Power’s been around for a while and they’ve done some seriously impressive installations.
What They Offer
Geo has installed solar PV systems for major clients including Mercedes Benz, JCB, Savoy Cinemas, and more than a dozen Moto motorway services.
But they’re not just about commercial work. They also serve residential customers across the UK and install battery storage, air source heat pumps, ground source heat pumps and EV chargers.
Geo works with a wider range of solar panels than most rivals, offering panels from Panasonic, JA Solar, Sharp, Hyundai, Suntech and more.
They’ve got a 4.8 Trustpilot score, which is outstanding for a company handling everything from small homes to massive commercial sites.
Oh, and here’s a nice touch – Geo plants a tree for every no-obligation quote it offers.
The Downsides
With such a wide range of services and clients, some people might prefer a company that focuses solely on domestic solar. But their reviews suggest they handle residential work just as well as commercial.
Trustpilot: 4.8/5 stars Best for: People wanting a full renewable energy package, not just solar
5. Octopus Energy
Best for: Brand recognition and existing customers
In just 10 years since its launch, Octopus Energy has grown to become the UK’s largest energy supplier and one of the biggest solar panel installers.
What They Offer
You don’t have to be an Octopus energy supply customer to use them for solar installation, though existing customers might get preferential treatment.
They offer a huge range of panel brands – basically whatever suits your needs and budget.
The big advantage here is that Octopus is a massive, established company that’s not going anywhere. When so many solar installers have gone bust over the years, that stability matters.
Plus, if you’re already an Octopus customer, managing everything through one company is convenient.
The Downsides
Being a massive company, you might not get the personal service you’d get from a smaller installer. Some people prefer the boutique approach.
Reviews are a bit mixed compared to specialist solar companies, though still generally positive.
Best for: Existing Octopus customers or people who value dealing with a well-known brand
6. Sunsave
Best for: Solar subscriptions (no upfront cost)
Sunsave’s a bit different. They’re big on solar subscriptions, which is basically renting your solar system rather than buying it outright.
What They Offer
The subscription model means no upfront costs. You pay monthly and Sunsave handles maintenance and monitoring. After 20 years, you can buy the system for a nominal fee or extend the subscription.
This makes solar accessible to people who can’t afford £6,000-£8,000 upfront but still want to benefit from lower electricity bills.
They use quality panels (Phono Solar, DMEGC Solar, JA Solar) and have solid warranties.
The Downsides
Over 20 years, you’ll pay more than if you’d bought the system outright. It’s convenient but not the most economical option long-term.
Also, if you move house, the subscription gets complicated. You either need to buy out the system or the new owner takes over the subscription.
Best for: People who can’t afford upfront costs but want to start saving on electricity now
7. Joju Solar
Best for: Community projects and ethical focus
Joju pioneered the UK’s first community share-funded solar installation in 2008, so they’ve been at this a long time.
What They Offer
They’ve collaborated with countless schools, councils and community groups, including installing rooftop solar on 14 schools and other community buildings in North Lincolnshire.
Joju’s commitment goes beyond installations – they organise free community events, provide energy advice at local hubs and reinvest project profits into initiatives like improving insulation.
They’ve won prestigious awards including the Alan Clark Award for Community Energy in 2024.
They do residential installations too, and bring the same ethical approach and expertise.
The Downsides
Not the cheapest option, and their focus on community/commercial work means residential customers might sometimes feel like they’re not the main priority.
Best for: People who want an ethical, community-focused installer
8. Effective Home
Best for: Reliability
Effective Home doesn’t have the flashiest website or the most aggressive marketing, but they consistently get great reviews for actually delivering what they promise.
What They Offer
They’re MCS certified, offer competitive pricing, and have a solid track record of installations that work as expected.
Multiple independent reviews have named them as one of the most reliable providers in the UK.
Their customer service is highly rated, and they follow up after installation to make sure everything’s working properly.
The Downsides
Less information available online compared to bigger companies. You’ll need to contact them directly for detailed quotes and specifications.
Best for: People who value reliability over flashy marketing
9. Solar Fast
Best for: Affordability and efficiency
Solar Fast is one of the UK’s fastest-growing solar panel installers, having installed over 47,000 panels.
What They Offer
They prioritise customer experience and affordability, offering flexible financing options.
Their Tier 1 DMEGC Solar panels have an efficiency rate of 22.02%, and they back products with a 30-year performance warranty and a 25-year product warranty.
Those are seriously good specs for the price point they operate at.
The Downsides
Being fast-growing can sometimes mean quality control issues as companies scale up rapidly. That said, their reviews remain strong.
Best for: People wanting good quality at competitive prices
10. Glow Green
Best for: Overall value and flexibility
Glow Green was recognised by The Independent in 2025 as the best solar panel installer in the UK due to industry experience and competitive pricing.
What They Offer
They stand out with their range of high-efficiency solar panels from top brands like Perlight and DMEGC, plus flexible financing options.
The Federation of Master Builders recognised Glow Green specifically for offering the best range of high-efficiency solar panels available on the market.
They’re MCS and NICEIC accredited, which covers both the solar and electrical aspects of installation.
The Downsides
Being recognised as “best overall” sometimes means they’re good at everything but not exceptional at any one thing. If you have specific priorities (like longest warranty or fastest installation), other companies on this list might suit better.
Best for: People wanting a solid all-round choice with good value
Honourable Mentions (Regional Specialists)
Can’t cover every installer, but these regional companies are worth checking if they’re in your area:
- Adept Renewables – Excellent reviews, strong in certain regions
- Spectra Solar – High customer satisfaction
- SW3 Green Energy Services – London and Southeast specialist
- The Solar Co – Good all-rounder
- J Kirby Electrical – Electricians who branched into solar
- Heat Electric Northwest – Obviously Northwest focused
- HSEnergy Group – Solid reputation
Regional installers often have advantages – better local knowledge, faster response times, more competitive pricing because they’ve got lower overheads than national companies.
Red Flags to Watch For
Whatever company you choose, watch out for these warning signs:
High-pressure sales tactics – “This price is only valid today” is rubbish. Walk away.
Prices way below market rate – If it’s £3,000 for a full system, something’s dodgy. Probably non-MCS certified or terrible panels.
No MCS certification – You won’t be eligible for SEG payments without it.
Vague contracts – Everything should be clearly specified in writing.
Poor online presence – In 2025, if a company doesn’t have decent reviews online, that’s suspicious.
Asking for full payment upfront – Normal practice is a deposit then balance on completion.
Companies less than 2-3 years old – Not impossible they’re legit, but solar companies go bust all the time. Newer companies carry more risk.
How to Actually Choose
Here’s my practical advice:
- Get quotes from 3-5 companies minimum – ideally mix of national and local
- Check their Trustpilot and Google reviews – look for patterns, not just overall scores
- Verify MCS certification – you can check on the MCS website
- Ask specific questions:
- What panels and inverters exactly?
- Full warranty terms?
- What happens if you go bust?
- Maintenance included?
- Timeline for installation?
- Compare like-for-like – same system size, same quality panels
- Don’t rush – this is a 25-year investment
- Check the contract carefully – especially warranty terms and what’s included
Final Thoughts
All ten companies on this list are solid choices. They’re all MCS certified, have good reviews, and aren’t going to disappear overnight (probably).
If I had to pick just one? For most people, I’d say Heatable or Solar4Good are your best bets – great customer service, transparent pricing, and solid track records without the premium price tag of Project Solar.
But honestly, the “best” installer depends on what you prioritise:
- Want the absolute best warranty? Project Solar
- Want no upfront cost? Sunsave
- Want ethical focus? Joju
- Want comprehensive renewables? Geo Green Power
- Want transparent online pricing? Heatable
Get multiple quotes, ask loads of questions, and go with whoever makes you feel most confident. Trust your gut – if something feels off about an installer, it probably is.
Good luck with your solar journey. You’re making a smart investment.