Built for UK fire & security engineers
The fire & security engineer app for invoices, estimates & jobs
Fire alarms, emergency lighting and access control — log compliance certificates and invoice routes. Send invoices from the van, take card payments online and file tax direct to HMRC — without juggling spreadsheets.
No credit card required
Invoice
INV-0042
Castle View Care Home
Everything fire & security engineers need to run the business
fixdd brings invoicing, estimates, jobs, customers and tax into one app — built around the way UK fire & security engineers actually work.
Invoicing for fire & security engineers
Send invoices from the van and get paid online by card.
Learn more →Estimates for fire & security engineers
Polished quotes clients accept online with deposits and stages.
Learn more →Job Management for fire & security engineers
Track every job from first quote through to final payment.
Learn more →Making Tax Digital for fire & security engineers
File VAT and Income Tax direct to HMRC under MTD.
Learn more →CRM for fire & security engineers
Full customer history — invoices, quotes, payments and notes.
Learn more →Invoice on the job — no laptop required
Turn a finished fire & security engineer job into a professional invoice in under a minute. Save labour rates, reuse common line items and send by email or WhatsApp before you've packed up.
- Online card payments built in
- Email open and read tracking
- Send via WhatsApp and other apps
- Mark as paid manually or automatically
Invoice INV-0089 paid
Castle View Care Home paid £240.00 via card
Invoice INV-0090 viewed
Customer opened your invoice 2 min ago
Invoice INV-0085 overdue
Tap to send a payment reminder
Win more work with polished fire & security engineer quotes
Send estimates clients can accept online with a single tap. Take deposits when they say yes, split bigger jobs into stages, and convert accepted quotes to invoices in two taps.
- Online acceptance with e-signature
- Deposit and staged payments
- Convert accepted quotes to invoices instantly
- Beautiful PDF downloads
Estimate
EST-0023
Making Tax Digital — built in for fire & security engineers
Submit VAT returns and Income Tax self-assessment straight to HMRC from the same app you invoice with. No spreadsheets, no separate software.
50k+
Invoices created
£100M+
Invoices processed
12,000+
Estimates sent
98%
Would recommend
Loved by UK fire & security engineers
I used to spend Sunday evenings doing invoices. Now I send them from the van before I've even left the job. fixdd has been a game-changer for me as a fire & security engineer.
Clients love the online quotes — they just tap accept and pay the deposit. I've won more work since switching to fixdd than I did all last year.
Ready to run your fire & security engineer business the easy way?
Join thousands of UK fire & security engineers using fixdd to invoice, quote and get paid. Free to start, no credit card required.
Get started freeNo credit card required