Home battery storage quotes: checked against real UK prices
Before you sign for a home battery, see what batteries actually cost, what one would save in your electricity region, and whether the price in front of you is fair. When you are ready, send a quote request and we reply by email.
The official median installed price for MCS-certified home batteries fitted between April 2025 and March 2026 was £1,300 per kWh under 6 kWh, £890 per kWh for 6 to 11 kWh and £630 per kWh for larger batteries. In this site's model a 10 kWh battery added to 4 kWp of solar saves £379 to £455 a year on Octopus Flux depending on region, but only £141 to £181 on a flat tariff. The tariff decides whether a battery pays.
Why battery storage quotes for the same home differ by thousands
Two quotes for "a 10 kWh battery" can be thousands of pounds apart and both be honest, because they are not quoting the same thing. The headline capacity, the inverter, the backup hardware and where the battery can legally go all move the price. These are the lines to compare before the total:
| What differs | Why it changes the price | What to ask for in writing |
|---|---|---|
| Usable vs nominal kWh | Batteries keep a reserve, so usable capacity is lower than the number on the box. E.ON Next's entry battery, for example, is 5.12 kWh with 4.6 kWh usable. | Usable capacity in kWh, and price divided by it |
| Inverter power and coupling | A battery added to existing panels usually needs its own inverter (AC-coupled); a new system can share a hybrid inverter (DC-coupled). | Inverter kW, and whether a new inverter is included |
| Backup in a power cut | Backup needs extra hardware. Tesla lists Powerwall 3 at £5,000 without its Backup Gateway 2 and £5,975 with it, before installation and VAT. | What stays on in a cut, and the hardware that does it |
| Where it will go | PAS 63100 rules out bedrooms, escape routes, lofts and some cellars; indoor rooms need 30-minute fire separation and ventilation to outside. Longer cable runs and enclosures cost more. | The location, and a PAS 63100 statement on the certificate |
| Brand and warranty | Warranties run from 10 years at 70% capacity to 15 years or 6,000 cycles, with conditions such as an internet connection or an approved installer. | Years, % capacity retained, throughput cap, conditions |
| Who fits it | MCS certification (standard MIS 3012) and a consumer code such as RECC or HIES cost the installer money and protect you. | MCS number, consumer code and how your deposit is protected |
The quote comparison checklist turns this into a list you can hold an installer to, and the home battery cost guide has the published prices by size and brand.
Got a quote? Check it against your usage and the official median
Choose your region, your usage and the battery you have been offered. The checker models the saving on the tariff you would use and compares your price per kWh with the DESNZ median for batteries of that size. It runs in your browser; nothing is sent.
Your home
Modelled result
Rates: Octopus Energy, 26 September 2026, including VAT. Solar yield: PVGIS for London. A model, not a quote: see how it works.
The same battery earns different amounts in different regions
Electricity prices, time-of-use rates and solar yield all vary across Great Britain's fourteen electricity regions. Running this site's model for the same home in each one (3,000 kWh a year, 4 kWp of solar, a 10 kWh battery on Octopus Flux) puts a difference of about £76 a year between the best and worst regions:
| Electricity region | Flux spread | With solar, Flux | No solar, Agile |
|---|---|---|---|
| Merseyside and North Wales | 21.4p | £455 | £317 |
| South East England | 20.6p | £435 | £287 |
| Eastern England | 20.4p | £427 | £307 |
| South West England | 20.4p | £425 | £250 |
| South Wales | 20.4p | £422 | £277 |
| Southern England | 20.4p | £421 | £308 |
| North West England | 20.2p | £417 | £300 |
| London | 20.4p | £414 | £335 |
| North Scotland | 20.5p | £407 | £222 |
| West Midlands | 19.6p | £390 | £276 |
| East Midlands | 19.4p | £386 | £297 |
| North East England | 19.5p | £385 | £272 |
| Yorkshire | 19.5p | £379 | £303 |
| South Scotland | 20.0p | £379 | £291 |
The gap is mostly the evening peak rate and how much solar surplus there is to store. See your region's page for its network operator, power-cut record and funding rules.
What home batteries cost to install in 2026
Median for a battery under 6 kWh
16,270 MCS-certified installations, April 2025 to March 2026 (was £1,080 the year before)
Median for a battery of 6 to 11 kWh
14,457 MCS-certified installations, April 2025 to March 2026 (was £910 the year before)
Median for a battery of 11 kWh or more
12,176 MCS-certified installations, April 2025 to March 2026 (was £590 the year before)
Those are official medians across every MCS-registered installation in existing homes, including battery, installation, connection and VAT where it applied, and excluding solar panels. Large suppliers publish "from" prices below the median for their standard packages:
| Published by | What | Price | Date |
|---|---|---|---|
| Octopus Energy | Battery only, about 5 kWh (a Fox ESS EVO 5 or one Enphase IQ Battery 5P) | from £3,947 | April 2026 prices |
| Octopus Energy | Battery only, about 10 kWh (one Fox ESS EVO 10 or two Enphase IQ Battery 5P) | from £5,336 | April 2026 prices |
| Octopus Energy | Battery only, Tesla Powerwall 3 (13.5 kWh) | from £7,999 | April 2026 prices |
| Octopus Energy | Extra 13.5 kWh Tesla Expansion Pack, fitted with the Powerwall 3 | £3,773 | April 2026 prices |
| Octopus Energy | Same Expansion Pack added to an existing Powerwall 3 later | £5,909 | April 2026 prices |
| E.ON Next | Home battery on its own (5.12 kWh, 4.6 kWh usable) | from £3,995 | checked 27 September 2026 |
The full cost guide covers sizes, brands and the extras that push a quote up, and solar panels and battery cost covers the combined packages.
Which kind of home battery are you pricing?
Solar panels and a battery
Fitting both at once shares scaffolding, an inverter and a visit.
Solar battery storage →A battery for panels you have
Retrofit usually means an AC-coupled battery with its own inverter.
Adding a battery →A battery with no solar
Charge at the overnight rate, use it at the daytime rate.
Battery without solar →Backup in power cuts
Only with the right hardware, and rarely the whole house by default.
Home battery backup →The batteries you are most likely to be quoted
Tesla Powerwall 3
13.5 kWh with a built-in solar inverter. Tesla lists £5,000 to £5,975 before VAT and installation.
UK price and warranty →Fox ESS
Modular LFP batteries with 10 or 12-year warranties depending on the range.
Fox ESS models →Enphase IQ Battery 5P
AC-coupled 5 kWh modules with a 15-year or 6,000-cycle warranty.
Enphase details →GivEnergy, after administration
What the April 2026 administration means for owners' warranties and app.
The GivEnergy update →Best home battery in the UK
Tesla, Fox ESS and Sunsynk compared on the numbers that matter.
The comparison →Compare every model
Usable capacity, power, warranty and published prices side by side.
Battery comparison →When a home battery does not pay
A battery earns only on the gap between the price it charges at and the price it saves or sells at. Where that gap is small, or there is little to shift, the payback runs past the warranty. It is usually a poor buy if:
- You would stay on a flat tariff. With solar it then only stores surplus in summer: £141 to £181 a year for a 10 kWh battery in the model, against a median installed price in the thousands.
- You use little electricity after dark. In this site's model a home using 2,000 kWh a year uses about 3.3 kWh a day outside daylight hours, so even a 5 kWh battery would rarely empty.
- You are offered more capacity than you can cycle. In the model, going from 13.5 to 20 kWh adds far less saving than the first 10 kWh, because the extra rarely empties.
- Nowhere suitable to put it. If PAS 63100 rules out every indoor location and there is no outside wall or garage, the cost of making a space compliant can sink the numbers.
- The quote is well above the median and the installer cannot say what the extra buys.
The home battery myths page takes on the most common claims in sales pitches, and the worth-it guide works through the maths.
On Octopus Flux in London a battery buys at 15.29p between 2am and 5am and saves 35.66p between 4pm and 7pm: about 18.7p per kWh after losses, every day it cycles. The question a quote has to answer is how many of those kWh your home can shift in a year, and whether that repays the price inside the warranty.
Installed home batteries carry 0% VAT until 31 March 2027, then 5% (HMRC VAT Notice 708/6). The government's Warm Homes Loan Scheme (launched 27 October 2026) lowers lenders' rates on loans of up to £15,000 for a battery; some loans are interest-free, not all. It is a loan, not a grant, and needs an MCS-certified installer; we are not a lender or credit broker. Grants, VAT and loans explained.
44,033 MCS-certified batteries were fitted in existing UK homes between April 2025 and March 2026, up 82% on the year before (DESNZ). That is official installation data, not reviews: this site publishes none.
Battery storage quotes from an energy supplier or a local installer
Most battery storage quotes come from one of two places: an energy supplier that installs batteries at published prices, or an independent installer that prices each home after a survey. Neither is cheaper by default. Three suppliers publish installed prices for the same Tesla Powerwall 3 within £204 of each other, so the difference between them is in the terms rather than the headline:
| What they publish | Octopus Energy | E.ON Next | EDF |
|---|---|---|---|
| Tesla Powerwall 3, installed | £7,999 | From £7,795 | From £7,995 |
| Entry battery, installed | £3,947 for a Fox ESS EVO 5 or an Enphase IQ Battery 5P | £3,995 for a Sunsynk Elite, 4.6 kWh usable | £3,995 for a Sunsynk battery with an inverter, £2,495 without |
| Survey and fitting | A remote survey form, or a surveyor's visit if you cannot complete it; Octopus confirms the price after | A full survey of the home to choose the battery's location | Fitted by Contact Solar, a Which? Trusted Trader |
| Paying | A £500 non-refundable deposit when you sign, then pay in full after installation or take a fixed-term loan | Finance example: £998.75 deposit on £3,995, 7.9% APR over 120 months, £5,291.15 in total | Not stated on its battery page |
| Tariff link | Intelligent Octopus Flux is currently open only to customers who bought solar panels and a battery from Octopus | £150 off a battery-only order for existing customers | An export tariff for battery buyers paying 18p per kWh |
A supplier's figure is a "from" price for a standard job, and the survey can move it: a long cable run, fire-rated work for an indoor location under PAS 63100 or a consumer unit upgrade all add cost. An independent MCS-certified installer prices those things from the start, can usually offer more brands and backup options, and is often the only route for an unusual home. Installer prices also vary more, which is what the quote checker above is for.
How many to get. Two or three written quotes for the same specification, plus one supplier's published price, is usually enough to show where a fair price sits. Ask every installer to quote the same usable kWh, inverter power and backup, then compare each price per usable kWh with the official median for that size.
Your right to cancel. A contract you agree at home, online or over the phone normally gives you 14 days to cancel under the Consumer Contracts Regulations 2013. If you ask for the installation to start inside those 14 days, you can be charged for the work already done. Get the cancellation and deposit terms in writing with the quote. Once you accept one, the home battery installation timeline sets out what happens next, week by week.
From a price you can trust to a battery on the wall
Check your numbers
Run the quote checker with your yearly use from your bill. It tells you roughly what size makes sense and what a fair price per kWh looks like.
Ask for quotes
We reply by email. Ask every installer you speak to for a written, itemised quote: usable kWh, inverter kW, backup, location, warranty and the full price.
Compare line by line
Put each price through the checker. A quote well above the median needs a reason; a quote well below it needs checking.
Survey and network notification
The installer surveys the site and notifies your network operator: within 28 days of commissioning for a small system under G98, or by applying before installation under G99.
Installation and paperwork
You should receive an MCS certificate, the electrical certificate with a PAS 63100 statement, and the warranty registration. No obligation applies at any earlier step.
No obligation at any point. Your details are used only to reply to you. RECC members cannot take a deposit above 25% of the price, and HIES protects deposits up to 25% or £5,000, whichever is lower.
Home battery storage in your region
Each regional page lists its network operator, the published tariff rates, PVGIS solar yield for its towns and cities, Ofgem's power-cut record and the funding rules that apply there.
Home battery storage quotes: questions
How much does home battery storage cost in the UK?
The official median for MCS-certified batteries fitted in existing homes between April 2025 and March 2026 was £1,300 per kWh for batteries under 6 kWh, £890 per kWh for 6 to 11 kWh and £630 per kWh above that (DESNZ). Published prices from large suppliers start lower: Octopus lists a 10 kWh battery-only installation from £5,336. The cost guide breaks it down by size and brand.
How do I get battery storage quotes?
Use the form on this page. We reply by email, so you can check any written prices you are offered. Before you accept one, check it with the quote checker above and the line-by-line checklist.
How many battery storage quotes should I get?
Two or three written quotes is usually enough, provided they price the same thing: the same usable kWh, inverter power, backup and location. Add one energy supplier's published price as a reference (Octopus lists a 10 kWh battery from £5,336 installed) and the official median for the size, and an outlier stands out quickly.
Are energy supplier battery prices cheaper than installer quotes?
Sometimes, for a standard job. Octopus, E.ON Next and EDF publish installed prices from £3,947 to £3,995 for an entry battery and from £7,795 to £7,999 for a Tesla Powerwall 3, all below the official median per kWh. They offer fewer brands, and the survey can change the price. The supplier battery comparison sets the four suppliers side by side, including British Gas. An independent installer may be the better quote for a battery added to unusual existing equipment, whole-home backup or a difficult location.
Is a home battery worth it without solar panels?
It can be, if you can use a time-of-use tariff. Octopus Flux needs solar panels, so a battery-only home is more likely to use Agile Octopus: in this site's model a 10 kWh battery on Agile saves £222 to £335 a year for a home using 3,000 kWh, depending on region. Homes with an electric car can do better on an overnight EV tariff. See battery without solar.
Is there a grant for home batteries?
There is no national home battery grant. Installed home batteries carry 0% VAT until 31 March 2027 (then 5%), the Warm Homes Loan Scheme offers loans of up to £15,000 for a battery, and some councils fund batteries alongside solar for eligible low-income homes through the Warm Homes: Local Grant. What exists, and what does not.
What size home battery do I need?
Size it to the electricity you use outside daylight hours, plus any overnight tariff charging, not to the biggest unit on offer. Most homes that use 2,700 to 4,000 kWh a year are well served by 5 to 13.5 kWh. The sizing guide shows how to work it out from your bill.
Where can a home battery be installed?
PAS 63100, the BSI fire-safety specification for batteries in homes, prefers outdoors and rules out bedrooms, escape routes such as hallways and landings, lofts and roof voids, and cellars without outside access. Garages and suitable utility rooms are usually possible. PAS 63100 explained.
Will a battery keep my power on in a power cut?
Only if the installation includes backup hardware, such as an emergency power socket or a backup gateway, and many do not by default. Ask what the quote includes. How home battery backup works.
Who runs this site?
SEO Dons Ltd, an independent publisher. It is not an installer and holds no trade accreditation. If you ask for quotes, the publisher replies to you by email. About the site.
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