Raise an invoice for a job and send it — in one place.
Worksum is Pixrweb's invoicing app for construction and trades firms. It keeps your clients, jobs and invoices together, handles the construction billing rules — CIS, VAT reverse charge and retention — and emails invoices to clients without leaving the page. It also receives supplier invoices, reads and checks them automatically, and files them in a searchable inbox both teams can reach. No training. No setup project. Worksum is in beta and we're onboarding early firms.
Invoices that get construction right.
Most tools stop at net and VAT. Worksum understands how the trade actually gets paid — so CIS, the VAT reverse charge and retention are worked out and on the invoice before it goes out.
- CIS deducted from the labour element
- VAT reverse charge with the HMRC wording
- Retention withheld and tracked per job
Everything a busy office needs — nothing it doesn't.
Worksum replaces spreadsheets, re-keyed figures and PDFs chased around inboxes with one calm workspace built for the way construction actually invoices.
Every invoice linked to a job
Clients, jobs and invoices live together — so you always know which invoice belongs to which job, and what each job has billed.
Send it from one place
Email a clean, branded invoice straight to the client — your letterhead, VAT number and bank details on it — without leaving the page.
CIS, reverse charge & retention
CIS deducted from the labour element, VAT domestic reverse charge with the right HMRC wording, and retention withheld per job. Worked out for you.
Totals you can trust
Net, VAT and deductions are calculated from the lines, so figures can't drift or get mis-keyed. The amount due is always right.
Your whole team
Add your office and site staff on one plan, with owner / admin / member roles. Everyone works from the same clients, jobs and invoices.
Sign in with Microsoft 365
Use the work account your firm already has — no new passwords to manage. Email registration is there too if you'd rather.
Your invoice inbox — outstanding, overdue, retention held and paid, at a glance.
From job to paid invoice.
Four taps, all in one place — no double entry, no separate email, no spreadsheet surgery.
Pick the client & job
Choose an existing client and the job you're billing — or add them in seconds. The invoice stays linked to the work.
Build & check
Add your lines; net, VAT, CIS, reverse charge and retention tot up live. Invoice numbers and dates are filled in for you.
Send & get paid
Email it to the client from the same screen, then track outstanding, overdue, retention held and paid at a glance.
Raising an invoice — pick the client and job, add your lines, done. Under a minute.
And the invoices coming in, too.
Suppliers email their invoices to one address. Worksum reads each one, checks the maths, catches duplicates, and files it in a searchable inbox your commercial and accounts teams both reach — no re-keying, no chasing PDFs around inboxes.
- Received by email or upload — nothing for suppliers to learn
- Read automatically: supplier, number, PO, net, VAT, total
- Maths checked and duplicate invoices caught before they're paid
- Clean ones auto-cleared; only the exceptions need a person
- One searchable record both teams can pull up in seconds
The billing rules a QS actually needs — handled.
Most invoicing tools stop at net and VAT. Worksum understands how construction gets paid, so the figures are right before the invoice goes out.
- CIS deducted from the labour element (20% / 30%)
- VAT domestic reverse charge with HMRC wording
- Retention withheld and tracked per job
- Labour vs materials split on every line
- Amount due = subtotal − retention − CIS
- Outstanding, overdue & retention held at a glance
Worksum is in beta — built by Pixrweb. Tell us about your firm and we'll get you set up with early access.
Got something to build?
Tell us about the project. We'll come back within one working day with honest thoughts on scope, timeline and budget — no hard sell.