WhatsApp invoicing built for gas engineers working across Peterborough and Cambridgeshire. Send a professional invoice from the customer's hallway — 1% per paid invoice, capped at £50, no subscription.
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 built for gas engineers working across Peterborough and Cambridgeshire. Send a professional invoice from the customer's hallway — 1% per paid invoice, capped at £50, no subscription.
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. 💰Peterborough gas engineering runs on heavy CIS subcontract heating demand from the Hampton, Great Haddon, and Cardea residential pipelines — main-contractor first-fix gas pipework, boiler commissioning, and final-fix sign-offs all run on CIS-deducted invoice ledgers with reverse-charge VAT for VAT-registered firms. CP12 demand from the city's private rented sector and the older Park Road conservation area provides the steady residential layer. Boiler swaps typically run £2,100–£3,800 on standard residential work; the A1/A14 logistics-park commercial demand adds occasional commercial heating service contracts. Many independent gas engineers cover Stamford, Spalding, and the wider Fens from a Peterborough base.
Text Wedge on WhatsApp with the job details, customer name, and amount.
Message
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
Your customer pays online. You get a WhatsApp notification when the money lands.
Message
No app to install. Just message Wedge on WhatsApp like you would a mate.
Tell us who to invoice and how much. We figure out the rest.
Clean, branded PDF invoices sent straight to your customer via WhatsApp.
Your customers pay online by card. Money lands in your bank account.
We chase late payers so you don't have to. Polite but persistent.
VAT-registered? We calculate and show VAT on every invoice automatically.
Every invoice, expense and mileage entry stored digitally as it happens. CSV export for FreeAgent, Xero, QuickBooks or Sage.
No app to install. Just message Wedge on WhatsApp like you would a mate.
Tell us who to invoice and how much. We figure out the rest.
Clean, branded PDF invoices sent straight to your customer via WhatsApp.
Your customers pay online by card. Money lands in your bank account.
We chase late payers so you don't have to. Polite but persistent.
VAT-registered? We calculate and show VAT on every invoice automatically.
Every invoice, expense and mileage entry stored digitally as it happens. CSV export for FreeAgent, Xero, QuickBooks or Sage.
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.
Comparing invoicing apps? See Wedge vs TaskDrop for a side-by-side comparison.
No subscription, no setup fee, no card-on-file fee. We only earn when you actually get paid.
Free forever. No monthly fee.
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.
Yes — flag the customer as VAT-registered and the job as CIS reverse-charge when you send. The invoice formats with the correct wording: VAT noted on the invoice rather than charged to the main contractor. Gas Safe registration still prints on every invoice and CP12.
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.
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.
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.
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.
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.
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.
Join tradespeople across the UK who get paid faster with Wedge.
WedgeWhatsApp invoicing for UK tradespeople. 1% per paid invoice (max £50) — no subscription.
