How Do You Check an Installer Is Really Tesla-Certified in the UK?

Search for a Powerwall quote and you'll find no shortage of companies with the Tesla logo sitting proudly on their homepage. Here's the uncomfortable truth: the badge on its own proves nothing. A logo is an image file — anyone can paste one onto a website, and some firms do exactly that. Certification is real, and it genuinely matters, but the graphic is not the evidence. If you're about to spend five figures on a home battery, it's worth two minutes to verify the claim properly before you sign anything.

First, it helps to be clear about what the claim actually means. A certified Tesla Powerwall installer has been approved by Tesla itself — not by a trade directory, not by a review site, and not by their own marketing department. It's Tesla's list, and Tesla decides who's on it. That's precisely why it's checkable, and precisely why a company that belongs on it will never mind you looking.

There is exactly one authoritative check, and it takes less time than reading a quote: Tesla's own installer locator, on Tesla's own website. Type in your postcode and see who comes up for your area. If a company tells you they're Tesla-certified and they don't appear in the locator for your postcode, that's not a paperwork quirk — it's a question they need to answer before you go any further. Don't take a screenshot on their website as a substitute, and don't take our word for it either. Go to the source.

Why does the distinction matter? Because certification changes real things about your installation, not just the sales pitch. Certified installers are trained on the hardware itself — how a Powerwall is mounted, wired, configured and commissioned is not the same as a generic battery install. The system is commissioned and registered through Tesla's own systems, which is what connects your battery properly to your warranty and the Tesla app. And there's a defined support path: if something needs attention down the line, a certified installer has a route back to Tesla rather than a shrug.

The second test is paperwork, and it separates professionals from the rest faster than any logo. A Powerwall can export power to the grid, which in the UK means it needs G99 approval from your District Network Operator — and that approval should be in place before the battery is installed, not chased afterwards. (The lighter G98 notify-after-connection route only covers small systems up to 3.68kW per phase; a Powerwall install goes through G99.) So ask any installer directly: who files the G99 application with my DNO, and when? The right answer is 'we do, and before your installation'. At South Coast Solar Solutions we handle the G99 application for you ahead of the install date, because that's simply how it should be done.

These checks apply whether you're adding a Powerwall to an existing solar array or fitting battery storage without solar panels — a battery-only retrofit goes through the same G99 process and deserves the same certified hands. The technology is identical; only the wiring around it changes.

The third test is the quote itself. A proper Powerwall quote is itemised, and it answers the questions a survey should have raised. Is scaffolding included if it's needed? Is any consumer-unit work covered, or is that a surprise waiting on install day? Are cable runs specified? Is there provision for expansion if you might add capacity later? For reference, our Powerwall 3 packages start from £12,920 with solar (currently with a £375 Tesla rebate), and a battery-only Powerwall 3 retrofit starts from £7,450 — all 'from' prices, subject to survey, and itemised so you can see what's in them. Whoever you use, insist on the same transparency.

Which brings us to the red flags. Be wary of any installer who pressures you not to bother with the locator check — there is no honest reason to discourage it. Be wary of 'we'll sort the paperwork later': with G99, later is the wrong order, and it can leave you with a battery that isn't properly approved to export. And be wary of one-line quotes. A single figure with no breakdown isn't a simpler quote; it's a quote hiding its gaps.

A short checklist, then, before you commit to anyone: find them on Tesla's installer locator using your own postcode; ask who files the G99 and confirm it happens before install; ask for an itemised quote covering scaffold, consumer-unit work, cable runs and expansion; and ask what the support route is if something goes wrong after commissioning. Four questions, ten minutes, and you'll know more than most buyers ever check.

We'll close the way we opened — honestly. South Coast Solar Solutions is one of the Tesla-certified installers covering the South Coast: we're a family-run, MCS-certified firm based in Portsmouth, working across Hampshire, the Isle of Wight, Dorset, West Sussex, East Sussex and Surrey, with a 5.0 rating from 61 Google reviews and a typical install done in a day. But don't take this article as proof of anything. Put our postcode area into Tesla's locator and check us exactly the way you'd check anyone else. That's the point.

And if you're still weighing up which battery suits your home in the first place, our Home battery storage guide walks through the options before you get anywhere near a quote.