Best Card Machine for Plumbers UK 2026

Plumbers bill on the road, often after a job that ran long or cost more in parts than expected. The final invoice amount shifts at the last minute, so you need a card reader that handles variable totals quickly, works reliably without a broadband connection, and settles funds fast enough to cover the next trade account order.

Mobile Connectivity and Same-Day Billing at the Customer's Door

Almost every plumbing job ends at someone's kitchen or bathroom, not at your own premises. You have no landline, no guaranteed Wi-Fi, and no till system. Your card reader has to connect through 4G or 5G on its own SIM or pair reliably with your phone's hotspot. Readers that depend on Bluetooth alone and then struggle if the phone moves a room away create an awkward moment in front of a customer who has just watched you fix their boiler.

Same-day or next-day billing matters too. Many plumbers buy parts on a trade account and settle it at the end of the week. The faster card payments land in your bank, the less you rely on short-term credit. Dojo settles funds to most UK business bank accounts by 10am the next business day. Square typically settles within one to two business days. Both are meaningfully faster than some traditional merchant account providers, which can take three to five days.

Fee Comparison: Best Options for Plumbers

Our Top Pick for Plumbers: Dojo

Dojo's 1.2% blended rate is the lowest published flat rate among widely available UK card readers for businesses under £100,000 in annual card turnover. On a typical plumbing week of ten jobs averaging £200 each, that's £2,000 processed. Dojo costs you £24 in fees. Square or Zettle at 1.75% costs £35 for the same volume. That difference of £11 per week adds up to around £572 a year, which is a reasonable chunk of a van service or a set of power tools.

The next-day settlement is the other reason Dojo suits plumbers specifically. Funds arrive by 10am the following business day in most cases. If you complete a £400 boiler repair on a Thursday afternoon, the money is in your account Friday morning before you head to the trade counter. Dojo's card reader also operates on its own 4G SIM, so you are not relying on a customer's Wi-Fi or burning through your phone's data allowance on every payment.

The honest caveat is that Dojo requires a monthly subscription contract and you'll need to contact them for a quote rather than signing up instantly online. If you do fewer than five or six card transactions a month, the fixed monthly cost may outweigh the fee saving over Square or SumUp pay-as-you-go. Read the full Dojo card machine review before committing.

Runner-Up Options

Square: Best for Plumbers Who Want Zero Monthly Commitment

Square costs nothing each month and the card reader is £19 as a one-off purchase. For a plumber who has just gone self-employed, works part-time, or takes a lot of cash in winter when domestic call-outs slow down, a zero-commitment setup removes financial risk. The 1.75% per transaction rate is higher than Dojo, but if your monthly card volume is under £1,000 there is no fixed cost eating into quiet months. Square also lets you send digital receipts and invoices from the same app, which is useful for emailing quotes or billing a landlord who isn't on site. Read the full Square card machine review for hardware options and setup details.

SumUp: Best if Your Monthly Card Volume Is Above £2,100

SumUp's standard pay-as-you-go rate of 1.69% is marginally cheaper than Square or Zettle. Sign up for SumUp One at £19 per month and the rate drops to 0.99% per transaction. That plan breaks even against the free tier at roughly £2,100 in monthly card sales, so if you're a busy sole trader or running a small team of plumbers and processing closer to £3,000 to £5,000 per month by card, SumUp One works out cheaper than every other option in this comparison. The hardware is small enough to fit in a tool bag without adding bulk. Read the full SumUp card reader review to compare hardware models.