Job management software for plumbers: a UK guide

Last updated: August 2026

It is twenty to ten on a Tuesday in January. There is water coming through a kitchen ceiling in one postcode and a boiler service booked for one o’clock in another. You can take the leak or keep the service. What you cannot easily do, with your arm inside somebody else’s airing cupboard, is work out who else is expecting you today and tell them before they find out for themselves.

That morning is the real specification. A plumbing and heating business is not short of tools. It is short of one place where the booking, the photographs, the commissioning record and the invoice all describe the same job at the same address.

Two trades, one van, and one register

“Plumber” and “heating engineer” are not the same job, and the difference is the most important structural fact about this trade. A plumber works on water: pipework, taps, bathrooms, cylinders, leaks and drainage inside the property line. A heating engineer works on the heat source, usually a gas boiler, and to touch gas at all the business must be on the Gas Safe Register. Most one van firms do both, and a significant minority of plumbers are not gas registered at all and refer the boiler work out.

Four business shapes turn up repeatedly: the one van sole trader, which is the overwhelming majority; the two to four engineer family firm, the size at which scheduling stops fitting in one person’s head; the five to fifteen engineer firm with an office person and a service book; and the gas registered subcontractor whose customers are really account managers.

Work still arrives by phone. A householder with water coming through a ceiling does not fill in a web form, so the job arrives as an interruption, from somebody stressed, and the only record of it is whatever the person who answered wrote down.

The winter runs the business

Seasonality here is sharp and asymmetric, because the peak is a breakdown peak rather than an install peak. Boilers fail when they are worked hardest and when condensate pipes freeze. A national repair operator reported increases of up to 278% in emergency boiler callouts during cold and snowy weather. You cannot hire for a fortnight of frozen condensate.

September and October are the service rush. Summer is install season, done when nobody is desperate for heat. So the business has to hold two modes: in summer, quoting, deposits and lead times; in winter, triage, callout pricing and the ability to move twelve booked jobs in one morning.

The cost of that morning is not the rescheduling. It is the communication. A customer who took a morning off work and got no call is a one star review and a lost repeat customer, and that repeat customer was the annual service and the eventual boiler replacement.

April is the mirror image. The phone stops, and the firm without a booked service base has nothing scheduled. Every annual service and inhibitor check recorded during the winter is a booking for the following summer. The weekly grid itself is covered in job scheduling for a small team.

Gas Safe, and the classification that no longer exists

Regulation 3 of the Gas Safety (Installation and Use) Regulations 1998 says nobody may carry out work on a gas fitting unless competent and a member of a class approved by HSE, which in practice means Gas Safe registration.

The distinction that marks an insider: registration is held by the business, and competence is held by the engineer, per appliance category. An ID card lists the categories the engineer has been assessed in: CENWAT for central heating and water heaters, CKR for cookers, HTR for fires and heaters. A registered business does not mean everyone in the van may work on everything.

On site, unsafe situations are classified under IGEM/G/11, currently Edition 2. There are two classifications: Immediately Dangerous and At Risk. “Not to Current Standards” has been removed as an unsafe classification, so an article listing three current classifications is describing a document that no longer says that. The customer signs a Warning or Advice Notice, and that signed notice is your evidence years later that you told them.

Separately, HSE sets out what has to be reported under RIDDOR 2013 regulation 11, within 14 days, and in Northern Ireland the report goes to HSENI on form NI2508G2. It is per job compliance that starts on a doorstep and has to be finished within a fortnight.

Notifying the work, and where the rules stop being English

Installing a heat producing appliance is notifiable building work in England and Wales. A registered business in the relevant competent person scheme self certifies and notifies through the scheme, normally within 30 days of completion, and the householder receives a Building Regulations certificate. The GOV.UK list of authorised schemes is canonical.

Boiler Plus, in force since 6 April 2018 through the Domestic Building Services Compliance Guide under Approved Document L, applies in England only. It requires a minimum ErP efficiency of 92%, time and temperature control where none is present and working, and for combi boilers one of four additional measures: flue gas heat recovery, weather compensation, load compensation, or smart controls with automation and optimisation.

Scotland runs on building warrants instead: the local authority acts as verifier, grants a warrant before work and accepts a completion certificate after. Northern Ireland administers building control through its 11 district councils with technical booklets of its own.

An unvented hot water storage system over 15 litres is notifiable under Part G in England and Wales and needs a G3 aligned qualification. And Regulation 5 of the Water Supply (Water Fittings) Regulations 1999 requires advance notice to the water undertaker, and consent, before certain installations. Approved contractor status through WaterSafe removes that delay from the customer’s project.

The warranty is three acts of record keeping

This is a revenue argument rather than a compliance one. Every boiler you install carries three obligations that are not really the householder’s.

The Benchmark checklist, run by the HHIC, is bound into the appliance documentation and completed and signed on site. Failing to complete it invalidates the manufacturer’s warranty. The boiler must also be registered with the manufacturer within 30 days: Baxi’s published terms state that if the warranty is not registered in time, the checklist is not completed, or an annual service is not carried out, the warranty reverts to the standard one year. And the annual service must be recorded on the Benchmark Service Interval Record and left with the householder.

BS 7593:2019 adds more. Clean the system, dose with inhibitor, fit a permanent in line filter, check inhibitor levels annually, and re dose or have the system water tested every five years.

So a ten year warranty sold at the point of quote is conditional on three separate acts of record keeping, two of which recur every year for a decade. When a claim is refused in year seven, the customer blames the installer, not the manufacturer, and the installer’s defence is a piece of paper filled in seven years ago. Read the same list the other way and it is a diary: every one of those obligations is a chargeable visit you are entitled to book, and mostly do not.

Parts, merchant runs and the second visit

A plumbing van is a rolling stock room and every job is a bet on whether the right part is in it. Merchant runs are unbilled time, several times a week.

Manufacturer parts are the harder problem. A specific PCB, fan or diverter valve is often not a merchant stock item, so it is ordered and the customer is without heat until it lands. That creates the two visit job: diagnose, order, return. It needs a part number, a supplier order reference, an ETA, a rebooking and a customer who has been told what is happening, all attached to the same job across a gap of days. On a fixed price job, the second visit is pure loss, so the record that prevents a third one pays for itself.

Mixed VAT rates, CIS, and paperwork as a legal position

Pricing runs on four models at once: callout plus labour, at a reported £60 to £120 often including the first hour; hourly, around £40 to £70; day rate, averaging £368; and fixed price, which is where the money and the risk both sit.

VAT is where a heating job gets awkward. Under VAT Notice 708/6, installation of qualifying energy saving materials is zero rated from 1 May 2023 to 31 March 2027. Gas boilers do not qualify; boiler controls, thermostats and mechanical or electronic valves do. That is a mixed rate invoice: the boiler at 20% and the smart thermostat fitted the same afternoon at 0%.

Plumbing and heating installation is inside the Construction Industry Scheme, and a firm is commonly on both sides of it in the same month, which is the subject of CIS invoicing for subcontractors. The VAT domestic reverse charge sits alongside it and never touches ordinary domestic work, because a householder is an end user. Making Tax Digital for Income Tax is live since 6 April 2026 for sole traders and landlords with qualifying income over £50,000.

A quote agreed in a customer’s kitchen is an off premises contract, and the Consumer Contracts Regulations 2013 give the consumer 14 days to cancel without giving a reason. Cancel on day thirteen where the required cancellation information was never given, and the customer pays nothing for work already done. Statutory late payment interest applies to business to business transactions only, which leaves deposits, written terms and, eventually, chasing an unpaid invoice.

What plumbing firms actually run on

Ask ten plumbers and you get three answers: a notepad and a phone, a general small business tool that was never built for site work, or a trades specific job app. The first works until there are two of you. The second breaks in a predictable place: it can raise an invoice, but it has nowhere to put the site address that is not the billing address, the boiler you worked on, the photograph of the leak, or the gas certificate.

That gap bites harder in this trade than most, because so much plumbing work is for landlords, agents and managed properties, where the person paying is not the person letting you in. A tool that assumes one address per customer has you retyping, and retyping is how the wrong property ends up on an invoice.

So judge a candidate against your worst week rather than a quiet Tuesday. Take a real emergency callout: the phone goes at eight, the site is somewhere you have never been, the customer is a tenant, the bill goes to an agent, you need a part you do not carry, and you are back on Thursday. Run that whole shape through it and count three things: how often you retyped something, how often you had to leave the app to send a message, and what ended up in your head because there was nowhere to put it.

How Dispatch helps

Dispatch is built for the way a plumbing week actually runs: booked work interrupted by emergencies, and a second visit waiting on a part.

Awaiting parts is a real status with the date the part is due back, and overdue ones surface on the dashboard, so the two visit job stops living in your head. Book onto a week calendar, drag it when an emergency lands, and the customer gets told automatically when a visit moves. Send a private link and the customer describes the fault with photographs before you drive out, then keep talking on a two way thread shared by WhatsApp or text.

On site, the completion report captures the write up and photographs before the job closes. Benchmark scans, gas certificates and RAMS attach to the job and stay for its life, so the warranty paperwork is still there in year eight when it matters. Recurring visits, switched on in Settings, book the annual service without anyone remembering.

Then quote, invoice and take card payment from the phone, into your own Stripe account, with overdue invoices chasing themselves at 3, 10 and 21 days.

What it will not do: produce the gas certificate itself, which comes from your own software and attaches to the job as a document; track van stock; or run without a connection, which is worth knowing before a plant room.

Every feature is on every plan, the caps are on seats and templates only, and everything runs in the UK. Start on the free plan and put a real callout through it.