Get the price agreed before you open the door.
Locked out at 11pm? Send a written price, have them accept it on their own phone, then start work — and invoice before you have packed the van.
14 days free. Unlimited quotes & invoicing. No card needed.
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14 days free. Full access. No card needed.
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One of these wins the work.
Same job, same price, same tradesperson. One went out as a text message. The other went out as a link.
How most trades quote
"Hi mate yeah the consumer unit swap is about 950 all in, thats the new board the bonding and the certificate. Let me know cheers Dave"
The same job with Larzo
It's your quote, not ours.
Your logo, your company details, your Gas Safe or NICEIC badge — set up once and on every quote automatically. Customers can't tell you don't have an office behind you.
Signed, and settled.
Your terms and a signature block go out with every quote, so what was agreed is written down before the work starts — not argued about after it. When they sign, we lock that exact version: their name, the date, the photos. So if anyone ever says "that's not what I signed for" — you've got it, right there.
Your badges, on every quote, automatically
NICEIC · Gas Safe · CHAS · TrustMark, and 18 more.
Open the full quote →Exactly what your customer receives.
Your quote, in about two minutes.
Three taps on your phone — that's the whole job.
- 1
Tell it the job
Type or talk through what needs doing — the trade, the work, the materials.
On site? Hit the mic and speak it.
- 2
We write it up
Larzo writes a professional description of works, adds your prices and your logo.
- 3
Send one link on WhatsApp
Tap send. Your customer gets a proper quote before you've left the driveway — and that same link later becomes the invoice and the way they pay you.
The job carries on without you.
You quoted it and they accepted. Everything from here — the invoice, the chasing, the receipts, the year-end paperwork — happens on the link your customer already has.
Straight away
Your phone buzzes the second they decide.
Accepted or declined, you know before you've finished the next job. No checking emails, no chasing. Works on iPhone and Android with nothing to download.
Invoice
One tap turns the quote into an invoice.
Bank details, due date, invoice number, all filled in. Or bill a job straight off without a quote at all. It lands on the link they already have.
Getting paid
The link chases the money so you don't have to.
It always shows what's been paid, what's still owed, and how to pay. Take a deposit, a stage payment, the balance — it updates itself. You never re-send and you never have to ask.
Your books
Snap the receipt. Bin the paper.
Larzo reads the vendor, the amount, the VAT and the date, and files it alongside your invoices so you can see what you're actually making on a job. Every month your accountant gets the lot — invoices, expenses, receipts, what you've been paid, what's outstanding, VAT totals, PDFs and CSVs attached. You're copied in, so you always know what went.
Trades pay an accountant £50–150 a month to chase invoices and sort receipts.
Larzo does that part automatically for £24 a month — and does your quotes, invoices and expenses as well.
Making Tax Digital
From April 2026, Making Tax Digital for Income Tax applies to sole traders and landlords earning over £50,000, with lower thresholds to follow. Larzo keeps the digital records it requires. It doesn't file to HMRC — your accountant still does that. What it means for you →
"A mate of mine, a sparky, told me he spends every Sunday night typing up quotes instead of being with his kids — and half his customers still went elsewhere because his quotes looked scrappy. That did my head in. So I built Larzo so you can rattle out a proper quote in two minutes and get your evenings back. I'm not a faceless app company — message support and it's me you'll get, and I'm in it for the long haul."
Sal Zahedi · Founder
"Sent 7 quotes in one day. Would’ve taken me all week before."
"Really useful and dead easy to use — fast, and the quotes look proper professional."
"I mostly just invoice straight off, no messing about with a quote first. And I can actually see who’s paid and who hasn’t, instead of chasing people for weeks."
Fourteen days free, then £24 a month.
The trial is full Pro with everything unlocked, and we don't ask for a card up front, so there's nothing to remember to cancel. £240 a year if you pay annually. Cancel whenever you like.
What Pro includes
- Unlimited quotes and invoicing
- One link for the quote, the invoice and getting paid
- Legally binding e-signature on every acceptance
- Receipt scanning and expense tracking
- Monthly, quarterly and yearly financial reports
- Automated accountant reports, MTD-ready
- Professional branded PDFs with your accreditation badges
- T&Cs and Trustpilot QR codes
VAT, sort codes, payment terms — all handled properly. Not a US app bodged for the UK. Made here, for here.
Free for 14 days.
Unlimited quotes and invoicing. No card needed.
Already have an account?
Larzo also works for:
Common questions from locksmiths
Can I get the price agreed before I start drilling?
Yes. Send the quote from your phone before you touch the door — the customer opens a link, types their name and taps accept. It takes them under a minute, and you have a written agreement before any work starts.
What if the customer later says they never agreed the price?
Every acceptance records the name they typed, the date and time, and the device and IP address it came from. That is a basic electronic signature under the Electronic Communications Act 2000, stored against the job — so the agreement exists in writing rather than in two conflicting memories.
Can I charge a call-out and then price the rest once I have seen the door?
Yes. Add the call-out as its own line, then add the lock, the labour or anything else as separate lines once you know what the job actually is. The customer sees the breakdown rather than one number.
Can I add my MLA membership to quotes?
Yes — Master Locksmiths Association is one of the accreditations you can add in settings, and it then appears on every quote and invoice PDF automatically.
Can I do the whole job — quote, signature, invoice — in one visit?
That is the normal way to use it on a lockout. Quote on arrival, get it accepted, do the work, convert the quote to an invoice and send it before you leave. The customer gets one link that becomes their invoice and payment page.
Is it Making Tax Digital ready?
Yes, for your record-keeping. Larzo keeps your invoiced income and VAT as digital records and emails quarterly summaries to your accountant. Larzo is not HMRC-recognised filing software — your accountant submits to HMRC.