Invoices from the phone
Raise the invoice on site. Add VAT when you charge it, and a CIS deduction when the contractor takes one. Email the PDF, then mark it paid when the money lands.
Site Books by GCB Group · on the App Store
Send the invoice before you leave the job.
Bookkeeping for UK trades, subcontractors, and small construction firms. Quotes, expenses, CIS, and a tax pot — on the iPhone already in your pocket.
- Try it
- 1 month free
- Pro Monthly
- £9.99
- Pro Annual
- £99.99
- Where
- iPhone app
SiteBooks
YouNew Invoice
Add Expense
Estimate
Money In
£4,280
Money Out
£640
CIS
£736
Tax Est.
£980
Safe to Spend
£1,920
Recent Invoices
View All
INV-009Hargreaves Contractors
£1,472SENT
INV-008Riverside Joinery
£890PAID
QTE-014
DRAFTNorthside Build
Issued6 Nov 2026
Valid until6 Dec 2026
Line items
Kitchen rewire1 × £1,840.00 (HOURS)
£1,840
- Subtotal
- £1,840.00
- VAT (20%)
- £368.00
- Total
- £2,208.00
Send to client
INV-009
SENTHargreaves Contractors
Labour invoice · emailed today
First fix labour1 × £1,840.00 (HOURS)
£1,840
- Subtotal
- £1,840.00
- CIS deduction (20%)
- −£368.00
- Amount due
- £1,472.00
Mark as paid
Expenses
Total: £480.00
AllMaterialsFuelPPE
Timber merchantMaterials
£240.00
Van dieselFuel
£160.00
Site bootsPPE
£80.00
Snap the receipt. Check the supplier, amount, and VAT before you file it.
Sample job. Figures are illustrative.
The honest bit
What are the books actually costing you?
Tap the week that sounds like yours. Site Books answers with what the iPhone app does today.
Site Books
The records can exist before anyone has to rebuild them.
A lot of that quarterly bill is someone typing up jobs you already finished. Site Books keeps the invoice, the receipt, and the CIS deduction while you are still on site, and puts a tax estimate next to them. Pro is £9.99 a month or £99.99 a year in the iOS app. You set money aside from the estimate. Filing with HMRC stays with you or your accountant.
What are you paying?
Drag this to the quarterly bill for someone else to sort the books. Site Books Pro Annual is £99.99 in the app.
£250/ quarter
£100£1,000
That bill, over a year£1,000
Site Books Pro Annual£99.99
£900.01 stays in the business instead of paying that yearly tidy-up.
This compares your figure with Site Books Pro Annual, an Apple in-app purchase. It is not a quote for accountancy and it is not tax advice. Site Books keeps estimates and records. It does not submit returns to HMRC. Plenty of firms still want an accountant at year-end — they just do not need one to reconstruct the month.
On the tools
A working day, with the books already done
Four beats. Same phone. Nothing waits until Sunday.
07:12
Quote the job
Kitchen rewire, priced in the van. Labour as a line, VAT on top, PDF emailed before the first fix. The number you said out loud is the number on the quote.
Quote total
£2,208
£1,840 labour + VAT
In the app
The jobs the phone actually does
The same screens as Site Books on iPhone. Unlimited invoices and quotes, on Pro.
Expenses and receipts
Snap the receipt and check the date, supplier, amount, and VAT it reads. File it under materials, tools, fuel, travel, PPE, or subbies.
CIS, kept as you go
Deductions show on the invoice and in a ledger: contractor, rate, and amount. 20% or 30%, without rebuilding the month from bank lines.
Tax pot and Safe to Spend
A running estimate from the income and expenses you have logged, and a figure for what is safe to spend once that pot is set aside. Estimates for you — filing stays with you.
Quotes that become invoices
Price the job with line items and VAT, send the PDF, and when it is accepted turn it into a draft invoice without retyping the lines.
Clients on the document
Keep the people you work for, including the email the invoice needs. Your business name and logo show on the quotes and invoices.
Built for site work
Vans, scaffolds, and the kitchen table
Ordinary days on the tools. These are the moments Site Books is for — not quotes from customers we invented.
01 · Driveway
The invoice goes before you do
Consumer unit finished at half four. The quote is already on the phone. Turn it into an invoice, show the CIS deduction if the main contractor takes one, and email the PDF while the tools go back in the van.
02 · Merchant
The receipt never lives in a jacket
Timber, screws, the fuel stop on the way home. Photograph it when it is handed over. Materials, tools, fuel, and PPE stay in categories, with the VAT noted, ready for when someone asks.
03 · Friday
CIS is a ledger, not a memory
20% on one job, 30% on another, a contractor who will “send the statement”. The ledger holds what was deducted, on which job, at which rate. You stop reconstructing it from the bank.
Pricing
Two prices. Both inside the iPhone app.
Pro is an Apple in-app purchase. One month free, then the plan you pick. Cancel anytime in your App Store account settings.
Pro Monthly
£9.99
per month
Billed every month through Apple
Pro Annual
Best value£99.99
per year
£19.89 less than £119.88 on monthly
- Unlimited invoices and quotes
- Expense tracking with receipt scanning
- CIS deduction management
- Live tax estimates and Safe to Spend
- Your payment details on the invoice
1 month free, then £9.99 a month or £99.99 a year. Bought in the iOS app through Apple. Site Books does not take card payments in the app, and it does not file to HMRC. Tax figures are estimates so you can set money aside.
Site Books by GCB Group
The books, in your pocket.
Download it on the App Store. One month free, then £9.99 a month or £99.99 a year, through Apple.
