What to Look for in a Plumber Invoicing App
Before comparing specific apps, it helps to be clear on what a solo self-employed plumber actually needs versus what you can safely ignore.
Must have
- ✓Fast invoice creation on your phone, on site
- ✓Professional PDF output your customer will trust
- ✓UK VAT handling (if you are registered)
- ✓Invoice tracking — paid, unpaid, overdue
- ✓Separate labour and materials line items (for CIS work)
- ✓Digital record storage for HMRC / MTD
Nice to have (but not critical for solos)
- ·Job scheduling and calendar
- ·Multi-staff timesheets
- ·Supplier integrations
- ·Full bookkeeping and bank reconciliation
- ·Gas Safe certificate templates
The most common mistake solo plumbers make is choosing a tool built for a team of ten when they need something that works brilliantly for one person on a phone.
Apps Compared: TraderInvoice, Tradify, Xero, FreeAgent, ServiceM8
Here is an honest assessment of each app from a solo UK plumber's perspective.
TraderInvoice
Our pickFree / £29 / £59 per month
Pros
- ✓Voice-to-invoice in under a minute on any phone
- ✓Trained on plumbing terminology (callout fees, labour, materials, parts)
- ✓Free plan with 5 invoices/month — no credit card
- ✓UK VAT and MTD compliant digital records
- ✓Voice quoting with customer approval links
- ✓No app download required — runs in your phone browser
Cons
- ✗No job scheduling or calendar features
- ✗No supplier integrations
- ✗Not built for plumbing businesses with multiple staff
Verdict: Best for solo UK plumbers who want fast, professional invoicing from their phone.
Tradify
£34 per month per user
Pros
- ✓Full job management: scheduling, quoting, invoicing in one tool
- ✓Gas Safe register integration
- ✓Supplier connections (Wolseley, etc.)
- ✓Timesheet tracking for multiple staff
Cons
- ✗More complex than a solo plumber needs
- ✗No voice invoicing
- ✗Price per user adds up for small teams
Verdict: Excellent if you have staff or sub-contractors, but overkill for a solo tradesperson.
Xero
From £16 per month
Pros
- ✓Market-leading bank reconciliation and bookkeeping
- ✓Strong VAT returns and MTD for ITSA support
- ✓Large ecosystem of accountants familiar with it
- ✓Good reporting and profit tracking
Cons
- ✗Not designed for on-site mobile invoicing
- ✗No voice input or trade-specific features
- ✗Steep learning curve for non-accountancy users
- ✗You will still need an accountant for Self Assessment
Verdict: Great accounting software, not a field invoicing tool. Best used alongside a dedicated invoice app.
FreeAgent
Free with NatWest/Mettle, otherwise £19–£29/month
Pros
- ✓Free if you use NatWest, RBS, or Mettle business banking
- ✓Good Self Assessment and MTD support
- ✓Handles CIS subcontractor records reasonably well
- ✓Time tracking and expense management
Cons
- ✗Invoice creation is desktop-oriented
- ✗No voice input or on-site workflow
- ✗Limited trade-specific features
Verdict: Hard to beat on price if you are a NatWest/Mettle customer. Pair it with a mobile invoicing tool for on-site use.
ServiceM8
Free up to 15 jobs/month, then from £29/month
Pros
- ✓Strong job scheduling and dispatch for teams
- ✓Client management and job history
- ✓Certificate and form templates
- ✓Integrates with Xero and QuickBooks
Cons
- ✗Primarily designed for teams, not solo operators
- ✗No voice invoicing
- ✗More complex setup than a solo plumber needs
Verdict: Strong for growing plumbing businesses. Too much overhead for a one-person operation.
The Best Choice for Solo Self-Employed Plumbers
If you are a one-person plumbing operation — working directly with homeowners, doing emergency call-outs, boiler servicing, bathroom fits, and general plumbing repairs — your invoicing needs are specific and distinct from a larger plumbing business.
You need an invoice on your phone, finished before you leave the job. You need it to look professional. You need to know which customers have not paid. And you need it to take as little time as possible — because admin is not why you went self-employed.
Full accounting platforms like Xero and FreeAgent are powerful, but they solve a different problem — bookkeeping, bank reconciliation, VAT returns — which most sole trader plumbers handle once a year with their accountant. They are not built for the 90 seconds between finishing a job and driving to the next one.
Job management apps like Tradify and ServiceM8 are excellent for plumbing businesses with teams, scheduling needs, and multiple ongoing jobs. For a solo operator, their complexity and price point deliver little additional value over a focused invoicing tool.
Invoice your next job in under a minute
TraderInvoice is free for up to 5 invoices per month. No credit card required. Speak your job details, get a professional invoice, send it before you leave.
Start Free — No Credit CardWhy TraderInvoice Wins for UK Plumbers
TraderInvoice was designed from the ground up for UK self-employed tradespeople — including plumbers. It is the only app in this comparison that uses voice input to generate invoices, understands plumbing-specific terminology, and was built for use from a phone on a job site rather than from a desk.
Voice invoicing that understands plumbing
You speak naturally — callout fee, labour hours, parts, boiler model, Gas Safe cert charge — and TraderInvoice builds a fully itemised, professional invoice. No typing on a tiny screen. No forgetting what you did because you left it until the evening.
Example voice input
“Invoice for Mr Collins at 22 Birchfield Road. Replaced leaking stopcock under kitchen sink. Callout fee eighty pounds. One hour labour at seventy-five per hour. Parts twenty-two pounds fifty. VAT at twenty percent.”
TraderInvoice produces a professional PDF with four itemised lines, correct VAT, and a total — ready to email to your customer.
CIS-ready invoice structure
For plumbers working as CIS subcontractors, TraderInvoice lets you clearly separate labour and materials on every invoice — the key requirement that determines which amount the contractor deducts 20% from. Read our full UK plumber invoicing guide for CIS invoice examples.
Quoting before the job starts
On the Starter plan (£29/month), you can create voice quotes the same way you create invoices. Your customer gets a private link to formally accept, request changes, or decline. When the job is done, one tap converts the accepted quote to an invoice — all line items carry over with no re-entry. This is the single most effective way to prevent end-of-job payment disputes.
See our dedicated guide: Plumber Quote Template UK — What to Include and How to Send It.
Pricing Comparison at a Glance
| App | Starting price | Free tier? | Voice input? |
|---|---|---|---|
| TraderInvoice | Free / £29/mo | Yes — 5 invoices/month | Yes |
| Tradify | £34/mo per user | No | No |
| Xero | £16/mo | No (30-day trial) | No |
| FreeAgent | Free (with NatWest) | Yes (with NatWest) | No |
| ServiceM8 | Free up to 15 jobs/mo | Yes (15 jobs/month) | No |
For a solo UK plumber doing 10–30 jobs a month, TraderInvoice at £29/month on the Starter plan is the most cost-effective option that is actually built for on-site mobile use. Use promo code 04TI26 to get your second month free when you upgrade.
Start with the free plan today
Five invoices per month, forever free. Invoice by voice on your very next job and see whether it fits your workflow before spending anything.
Frequently Asked Questions
What is the best free invoicing app for plumbers in the UK?
- TraderInvoice offers the best free plan for UK plumbers: 5 invoices per month, voice-to-invoice, professional PDF output, and customer management — no credit card required. For plumbers who need unlimited invoices, the Starter plan at £29/month is the best value for solo self-employed tradespeople.
Do I need accounting software or invoicing software as a self-employed plumber?
- Most self-employed plumbers need invoicing software first and foremost — the ability to create professional invoices, track who has paid, and chase overdue amounts. Full accounting software (Xero, FreeAgent, QuickBooks) is more than most sole traders need day-to-day. Use a dedicated invoicing app like TraderInvoice for your day-to-day workflow, and have an accountant handle your Self Assessment at year end.
Is Tradify worth it for a solo plumber in the UK?
- Tradify is a strong choice for plumbing businesses with teams and complex job management needs (scheduling, multiple staff, supplier connections). For a solo self-employed plumber who primarily needs fast, professional invoicing, Tradify's £34/month price and feature complexity is more than necessary. TraderInvoice at £29/month or free is better suited to the solo tradesperson who wants to invoice by voice from their phone.
Can I use Xero or FreeAgent for plumber invoicing?
- Yes, but both are primarily accounting tools rather than trade invoicing apps. Xero and FreeAgent are excellent for bookkeeping, bank reconciliation, VAT returns, and Self Assessment — but neither is designed for on-site mobile invoicing or understands trade-specific terminology. Many plumbers use TraderInvoice for day-to-day invoicing and export records to their accountant who uses Xero or FreeAgent for the annual accounts.
Does TraderInvoice handle CIS invoices for plumbers?
- TraderInvoice lets you separate labour and materials on every invoice, which is the key requirement for CIS invoices. You can clearly itemise labour (subject to CIS deduction) separately from materials (not subject to deduction), making it easy for the contractor to apply the correct deduction.