costin keeps your enquiries, quotes, jobs, orders, labour and invoices in one place, so you can see where the money is going while there's still time to do something about it. Built by a builder, for builders.
Register for early access See what it doesEverything a small building firm juggles on paper, in spreadsheets and in its head, in one place.
Log every lead, send a quote on your own letterhead, and see when the customer has opened it and accepted it.
Materials, labour, subcontractors and extras against the price agreed — estimated and actual side by side, with a colour to tell you at a glance.
Raise purchase orders, email them to the supplier as a PDF, and match their invoices back to the order and the job.
Drop in the month's emailed invoices. costin reads the invoice number, date and amount, and stops the same invoice being paid twice.
Who was on which job each day, what they're owed, and CIS payment and deduction statements for your subbies.
Price extra work, send it to the customer to approve, and see what it actually cost you.
Invoice from the quote, including the domestic reverse charge and zero-rated work, and track what's still owed.
The weather, what happened and photos from site, each day. Turn a week of it into a progress update on your letterhead for the customer — with a private link and a note of when they opened it.
Drop in fuel receipts and bills, and see each quarter's income and costs in HMRC's own categories — the figures Making Tax Digital asks for, ready for you or your accountant.
Connect your accounts and send sales invoices, customers, supplier bills and suppliers across in a click. When a customer pays, costin sees it.
Site managers log what's happening without seeing prices or wages. Every login is named, so you know who did what.
costin was built by people who run building jobs, after years of spreadsheets and an old database that only one person understood. Everything in it is there because it was needed on a real job.
Every firm gets its own separate copy of costin with its own database — your jobs, customers and prices are never stored alongside anyone else’s. We only use your data to run costin for you, and we don’t look at it unless you ask us to help with something. If you leave, you take it with you.
We're opening costin to a small number of UK building firms first. Send us your name, your firm and roughly how many people would use it, and we'll be in touch.
Email us to registerOr write to hello@costin.app. We only use your details to reply and to tell you about early access — see our privacy policy.