WhatsApp invoicing for gas engineers
Issue a CP12 invoice from the landing strip before you've packed the analyser. Wedge turns one WhatsApp message into a Gas Safe-branded invoice with a Stripe link — and we only take 1% when your customer pays, capped at £50 per invoice.
Wedge
Invoice INV-014 for £350 sent to Dave Smith. ✉️Wedge
Dave Smith paid £350 for INV-014. 💰Only pay when you get paid. 1% per invoice, capped at £50.
WhatsApp invoicing for gas engineers
Issue a CP12 invoice from the landing strip before you've packed the analyser. Wedge turns one WhatsApp message into a Gas Safe-branded invoice with a Stripe link — and we only take 1% when your customer pays, capped at £50 per invoice.
Only pay when you get paid. 1% per invoice, capped at £50.
Wedge
Invoice INV-014 for £350 sent to Dave Smith. ✉️Wedge
Dave Smith paid £350 for INV-014. 💰Send a message
Text Wedge on WhatsApp with the job details, customer name, and amount.
Message
We handle the rest
Wedge creates a professional invoice and emails it to your customer with a payment link.
From: invoices@wedge.uk
Invoice INV-014 from Mike's Tiling
Mike's Tiling
mike@example.com
INV-014
8 Mar 2026
Bill to
Dave Smith
Secure payment powered by Stripe
Get paid
Your customer pays online. You get a WhatsApp notification when the money lands.
Message
Everything you need to get paid
-WhatsApp-native
No app to install. Just message Wedge on WhatsApp like you would a mate.
-AI-powered parsing
Tell us who to invoice and how much. We figure out the rest.
-Professional invoices
Clean, branded PDF invoices sent straight to your customer via WhatsApp.
-Stripe payments
Your customers pay online by card. Money lands in your bank account.
-Automatic reminders
We chase late payers so you don't have to. Polite but persistent.
-VAT support
VAT-registered? We calculate and show VAT on every invoice automatically.
-MTD-ready records
Every invoice, expense and mileage entry stored digitally as it happens. CSV export for FreeAgent, Xero, QuickBooks or Sage.
-WhatsApp-native
No app to install. Just message Wedge on WhatsApp like you would a mate.
-AI-powered parsing
Tell us who to invoice and how much. We figure out the rest.
-Professional invoices
Clean, branded PDF invoices sent straight to your customer via WhatsApp.
-Stripe payments
Your customers pay online by card. Money lands in your bank account.
-Automatic reminders
We chase late payers so you don't have to. Polite but persistent.
-VAT support
VAT-registered? We calculate and show VAT on every invoice automatically.
-MTD-ready records
Every invoice, expense and mileage entry stored digitally as it happens. CSV export for FreeAgent, Xero, QuickBooks or Sage.
Boiler swap plus annual service for a landlord portfolio
You're servicing a portfolio of 8 rental flats for a landlord — annual gas safety checks (CP12s) on each, plus a full boiler replacement on flat 3 where the old combi has finally given up. Quote: £80 per CP12 × 8 = £640, plus £2,400 for the boiler swap including parts and a power flush. Total £3,040. Message Wedge: "Invoice James Patel £640 for 8 annual gas safety checks plus £2,400 for boiler replacement at 3 Marsh Court." Wedge generates one invoice with both line items, your Gas Safe registration number in the header, sends it via WhatsApp with a card payment link, and chases on day five. James pays £3,040; £3,009.60 lands in your account — £30.40 fee, well under the £50 cap. No monthly subscription. If next month is quieter, you only pay 1% on the jobs you actually invoice.
Wedge for gas engineers across the UK
Dedicated pages for gas engineers working in each city — with local context on day rates, CIS prevalence, and the specifics of invoicing for the gas engineers market in your area.
Free forever. 1% only when your customer pays — capped at £50 per invoice.
No subscription, no setup fee, no card-on-file fee. We only earn when you actually get paid.
Free forever. No monthly fee.
- Unlimited invoices & quotes
- Expense tracking
- WhatsApp notifications
- Stripe payment links
- Automatic reminders
- Professional PDF invoices
- VAT support
See the math
Type any invoice amount. Toggle the payment method to compare.
Bank-transfer invoices remain free — we only charge when the customer pays by card or Open Banking.
Frequently asked questions
Does my Gas Safe registration number appear on every invoice?+
Yes. Add your Gas Safe registration once at sign-up and it appears in the header of every invoice, quote, and CP12 you send. Landlords and letting agents look for it — legally required on any gas work documentation.
Can I invoice for CP12 landlord gas safety certificates?+
Yes. Mention CP12 in your message — e.g. "Invoice Sarah £80 for annual CP12 at 14 Oak Road" — and Wedge generates the invoice with the right reference and your Gas Safe number. Send the actual certificate as a follow-up WhatsApp message in the same thread.
How do I invoice for boiler installations with parts and labour split?+
Tell Wedge in plain English: "£900 boiler, £150 magnetic filter, £120 power flush, £600 labour, plus 20% VAT if registered." The AI breaks it into separate line items so the customer sees exactly what they're paying for. Useful for warranty claims later.
Can I send job reports alongside an invoice?+
Yes — once the invoice is sent, follow up in the same WhatsApp thread with photos of the work or the CP12 PDF. Customers like having the invoice, photos, and certificate in one place. Wedge stores the conversation against the job.
I work as a subcontractor for a main heating company — how does CIS work?+
Mention CIS when you message Wedge ("CIS deduction at 20%") and the invoice shows the gross, the 20% labour-only deduction, and the net amount due. The contractor pays you the net; HMRC reporting stays your responsibility.
How do I bill for annual service plans?+
Send the customer their yearly invoice via WhatsApp when the service is due. For ongoing maintenance contracts where you bill monthly, just message Wedge each month — same flow, no setup.
Ready to stop chasing invoices?
Join tradespeople across the UK who get paid faster with Wedge.
WedgeWhatsApp invoicing for UK tradespeople. 1% per paid invoice (max £50) — no subscription.