Last updated: 15 October 2026
Most businesses in England can switch business water supplier, and the process is simpler than many expect. You change the company that bills you and handles your account, not the pipes or the water itself. This guide explains who can switch, what you need, the steps, how long it takes and the problems that most often slow a switch down.
Can my business switch water supplier?
If your premises are in England and mainly used for business, you can almost certainly switch. Rules differ across the UK, so where your premises sit decides what choice you have.
The business water market in England opened on 1 April 2017, giving more than 1.2 million businesses, charities and public sector bodies a choice of retailer, according to gov.uk. Scotland went first: WICS, the Scottish regulator, says all non-household and public sector customers there have been able to choose their retailer since 1 April 2008.
| Where your premises are | Can you switch? | What the official source says |
|---|---|---|
| England | Yes, for most non-household premises | Most businesses, charities and public sector bodies can choose (Open Water) |
| Wales | Only very large users | Water only, if premises use more than 50 million litres a year; wastewater cannot be switched (Open Water) |
| Scotland | Yes | All non-household customers since 1 April 2008; more than 150,000 are eligible (WICS) |
| Northern Ireland | No | You cannot choose your own supplier; Northern Ireland Water supplies you (gov.uk) |
If your premises already have a water retailer, you are likely to be eligible. If they do not, Open Water says it depends on whether the premises are mainly used for business. If a retailer says you are not eligible and you disagree, you can ask Ofwat for a formal decision.
What do you actually switch?
You switch the retailer, not the network. The retailer is the company that bills you, reads your meter, answers your queries and handles complaints.
In England and Wales, the regional water companies stay as wholesalers. Open Water explains that they keep supplying water, treating wastewater and maintaining the pipes, while retailers buy those wholesale services and sell them to you with their own service on top. Scotland works the same way, with Scottish Water as the wholesaler and licensed providers serving customers.
What stays the same when you switch?
Your water supply, the pipes and the water quality stay exactly as they are. Open Water’s switching FAQs say the wholesaler does not change and your service will not be interrupted.
Emergencies are still fixed by the wholesaler, because it owns and runs the network. In England, the Consumer Council for Water (CCW) says your retailer is your main point of contact during an incident, though you may hear from the wholesaler directly. In Scotland, Scottish Water asks businesses to contact it directly about issues like bursts, leaks, water quality and sewer flooding.
What do you need before you switch?
You need a recent bill and a clear picture of how much water you use. Having these ready makes quotes more accurate and stops the switch stalling.
- Your latest water bill. It shows your current retailer, payment method, charges and annual use (Open Water).
- Your SPID (supply point ID). This is on your bill and is 13 digits long. You may have one SPID for water and another for wastewater (Open Water FAQs).
- Recent meter readings. A current read helps retailers quote on real use rather than estimates.
- Account and business details. Your account number, the legal name of the business, the premises address and how the premises are used.
- Your current contract terms. The end date and any notice or exit terms.
You do not strictly need your SPID to switch, but Open Water says giving it helps. If you cannot find your bill or have just moved in, any retailer can tell you who your premises are registered to.
How do you switch business water supplier, step by step?
Switching follows the same basic order for most businesses. The steps below follow the process set out by Open Water, the Ofwat owned service for business customers in England.
- Check your eligibility. Confirm your premises can switch using the table above or the Open Water eligibility guide.
- Gather your bill and use. Note your annual water use, SPIDs, payment method and current charges.
- Decide what to switch. You can switch water supply, wastewater, or both.
- Ask your current retailer first. It may improve your deal before you shop around.
- Compare retailers. Look at prices, contract terms and service, not just the headline rate. Open Water suggests checking complaints data from CCW and performance data from MOSL, the market operator.
- Agree a deal. The new retailer confirms you are eligible and answers your contract questions.
- Let the new retailer start the switch. Your chosen retailer starts the process and submits the transfer.
- Pay the final bill. Your old retailer sends a final bill for any remaining charges, and your new retailer bills you from then on.
If you have switched energy before, the order will feel familiar. Our guide to switching business energy supplier covers the electricity and gas side.
How long does a business water switch take?
In England, a switch should take no more than one month once you decide to go ahead, according to Open Water. The switch date you agree can be between 6 and 20 business days after the new retailer submits the transfer application (Open Water FAQs).
Micro-businesses, meaning those with fewer than 10 employees, get a seven calendar day cooling-off period. The Open Water FAQs say the transfer cannot be submitted until that period ends, and cancelling during it costs nothing. There is no charge to switch.
In Scotland, the Central Market Agency manages registration and switching. Your chosen licensed provider can tell you how long it expects your switch to take.
What contract and exit terms should you check?
Read the terms before you agree, because water contracts vary between retailers. A lower rate is less useful if the exit terms or service levels do not suit you.
Questions worth asking:
- How long is the contract, and when exactly does it end?
- How much notice must you give, and is there a fee to leave early?
- Which charges are fixed, and which can change during the contract?
- Is the deal for water, wastewater or both?
- How often will the meter be read, and how are estimated bills handled?
- What happens when the contract ends if you do nothing?
Contracts can be agreed orally or in writing. For micro-businesses on an oral agreement, the Open Water FAQs say the retailer must send you the key information and terms in writing and record your acceptance.
What are deemed or default terms?
Deemed or default terms are what you pay when you have no agreed contract. This often happens when you move into new premises, or when you never chose a deal after the market opened.
If you are on a default tariff, Open Water says your retailer must tell you about contracts that may suit you better. It also says businesses that have not switched or changed deal since April 2017 keep price protection if they stay put. That protection does not mean the deal is the best one for you, so it is still worth comparing.
The same habit that helps with energy helps here. SEFE Energy advises reviewing renewals early and speaking to your supplier or broker in good time, rather than drifting onto out-of-contract terms.
Can large water users supply themselves?
Yes. Businesses with several premises or high water use can apply to Ofwat for a self-supply licence, which lets them buy wholesale services directly and act as their own retailer.
Open Water lists the possible benefits as lower retail costs, less admin, consolidated billing and full control of your own usage data. You apply using the WSSL form on the Ofwat website. It takes time and resource to run, so it suits a small number of large organisations rather than most businesses.
What problems can slow a switch down?
Most delays come from missing or wrong information on the account. Fixing these before you start saves time.
- Debt or disputes on the account. Your old retailer still sends a final bill. Settle it, or raise any dispute in writing, so it does not follow you after the switch.
- Wrong premises or business details. Eligibility depends on how the premises are used, so check the address, business name and premises use on your account are correct.
- Unread or estimated meters. For metered premises, MOSL says the incoming retailer must arrange a transfer read for the outgoing retailer. Keeping your meter accessible helps the final bill reflect real use.
- Missing SPIDs. If you have water and wastewater SPIDs, make sure both are included if you want to move both services.
- Cold callers. Open Water advises checking that any caller claiming to be a retailer appears on the official list with the same name and contact details.
If something goes wrong, complain to your retailer in writing first. The Open Water FAQs say the retailer should give a full response within 10 working days or make an automatic £20 payment, and CCW may help if you cannot resolve it.
What makes up a business water bill?
A business water bill combines wholesale charges from the regional water company with the retailer’s own charges for billing and service. That is why switching retailer can change your bill while the supply stays the same.
The main parts are usually water supply and wastewater, and the amounts depend on your use, your region and your contract, so prices vary. For a full breakdown of each charge and how VAT applies, read business water rates explained.
How can a broker like Utility Market Watch help?
A broker does the comparing and paperwork for you. At Utility Market Watch we compare business water deals from our panel of retailers, check the contract terms and handle the switch with the new retailer.
We can also check your current bills through our free UMW Health Check, which looks for billing errors and missed discounts. As Open Water notes, some intermediaries charge for their services, so always ask any broker how they are paid.
Frequently asked questions
Does it cost anything to switch business water supplier?
No. Open Water’s switching FAQs say there is no cost to switch. Check your current contract for any early exit terms before you leave.
Will my water be cut off during the switch?
No. Your service will not be interrupted, because the wholesaler keeps running the network. Only the company that bills you changes.
Where do I find my SPID?
Your SPID is on your latest water bill and is 13 digits long. You may have separate SPIDs for water and wastewater. If you cannot find it, any retailer can look up your premises.
What if a retailer says my premises are not eligible?
The Open Water eligibility guide gives an indication only, not a final decision. If you disagree with a retailer’s decision, you can ask Ofwat to make a formal decision.
Can businesses in Wales switch water supplier?
Only if the premises use more than 50 million litres of water a year, and only for water supply. Wastewater cannot be switched in Wales, according to Open Water.
Can I switch in Northern Ireland?
No. Gov.uk says businesses in Northern Ireland cannot choose their supplier, and water is supplied by Northern Ireland Water.
Can I switch water and energy at the same time?
Yes. They are separate contracts with separate switches, but a broker can review both together. See our guide to switching business energy supplier for the energy side.
Can I change my mind after agreeing a switch?
Micro-businesses get a seven calendar day cooling-off period and can cancel at no cost during it. Open Water also says you can stop a switch at any time without giving a reason, so speak to the new retailer as soon as possible.
Get a quote
If you want to switch business water supplier or check you are on the right deal, request a quote and we will compare options for your premises. You can also call us on 03333 601010, Monday to Friday, 9am to 5pm, or contact us online.