Tesla Powerwall 3 Cost in the UK: What You'll Pay Installed

Fully installed Tesla Powerwall 3 prices published by the five UK installers we checked run from £7,000, the lowest figure (Stratford Energy, and Glow Green's FAQ), to £12,000, the highest (EnergyPlus's quote range and iHeat's overall range). Installed prices generally cover the 13.5 kWh battery and labour, and sometimes a gateway. These are installers' own published prices, not independent quotes, and we checked them in October 2026.

Five installers publish fully installed prices between £7,000 and £12,000. The table lists each figure as printed, with what it includes and any VAT detail. The prices are not like-for-like: some include a gateway, some say nothing about VAT, and Glow Green's page gives two different figures. Ranges reflect different homes, locations and amounts of installation work.

Four installers list a unit-only price, from £6,495 to £8,925, mostly without saying how VAT is treated. The Eco Experts gives a March 2026 list price of £5,000 excluding VAT, and about £7,995 elsewhere on its page. Installation and any gateway are extra, so these are not comparable with installed prices.

Sources name it differently: a Gateway, a Backup Gateway or a Backup Gateway 2. Published figures run from £500 to £1,170, some quoted installed and some as an add-on. No UK source we found lists a Backup Switch price, so ask for the gateway and any Backup Switch as separate lines in your quote.

Two installers state what an expansion pack adds: around £4,700 installed, and £5,000–£5,500. Other sites show whole-system prices that already include one, such as a 27 kWh system installed from £12,545. The figures cover different things, so ask whether a quote for extra capacity includes installation and the gateway.

Installers say the final price depends on wiring, location and how complex the job is, with higher prices in London and the South East. Whether a gateway is included, whether you add extra capacity or solar panels, and whether it is a battery-only retrofit also change the total. Treat published prices as a starting point, not a quote.

GOV.UK's VAT rates guidance, updated 10 July 2026, lists electrical storage batteries installed in residential accommodation at 0% until 31 March 2027. VAT Notice 708/6 says the 5% reduced rate applies to installations of energy-saving materials from 1 April 2027. Check current rules and ask each installer how VAT is shown in your quote.

GivEnergy and Enphase publish UK prices for their batteries, while Sungrow and EcoFlow list capacity and warranty but not prices. The published figures are kit or module prices, not installed totals, so they cannot be compared directly with the installed Powerwall 3 prices above. Capacity and warranty are the fairer comparison.

It depends on how much electricity you use in the evening, whether you have solar panels, your tariff and what you pay upfront. We have not included savings or payback figures on this page because we could not source them independently. Our home battery guide explains how sizing and tariffs fit together.

Ask for an itemised written quote that lists the Powerwall 3, the gateway by name, any Backup Switch, installation and any expansion pack as separate lines. Ask whether VAT is included and what the price assumes about your wiring and location. Comparing a few quotes on the same basis is easier than comparing headline prices.

We read each UK installer page in October 2026 and recorded every figure as printed, with its date. We did not estimate or fill gaps. Where one page gave two figures for the same thing (Glow Green, Heatable, The Eco Experts), we show both and say where each appears. Every source here has a commercial interest.