This is one customer's measured result, shared anonymously. The figure below is the headline outcome the contractor reported; the breakdown later in this article explains how a saving of that size comes together.
The situation, before DuoApp
Like a lot of growing contractors, the business had outrun its tools. Several live sites were being run on a patchwork of spreadsheets, WhatsApp groups and paper. Operatives jotted hours on paper or fired them over by message; back in the office, staff re-keyed those timesheets into a spreadsheet, then again into payroll and again into valuations.
Approvals were a chase. Variations were agreed verbally on site and, often as not, never made it onto an invoice. Retention and CIS deductions were tracked by hand, so the numbers drifted and money quietly went uncollected. Certificates and insurance documents lived in inboxes, and nobody was quite sure which version was current.
The knock-on effect was cashflow. Because valuations and invoices were slow to assemble - and slow to reconcile against what was actually agreed - applications went out late, queries took days to answer, and cash that should have been in the bank sat in someone's to-do pile instead.
What changed
The contractor moved the whole loop onto one platform. Projects and tasks gave every site a single source of truth. Timesheets were captured against the job rather than re-typed, so the same hours flowed straight through to costing and payroll without a second round of data entry.
Variations and sign-offs ran through smart approvals, so what was agreed on site was logged the moment it happened. CIS-ready auto-invoicing built applications and invoices from the live project data, with deductions calculated correctly the first time. Retention and deductions were tracked automatically against each subcontractor, and document compliance kept certificates and insurances in one place with expiry reminders.
None of this is glamorous on its own. Added together, it removed a large slice of weekly admin and closed the gaps that had been quietly costing the business money.
Where the £4,000+ a week comes from
The headline figure is the outcome the contractor measured across a typical week. It isn't a single line item - it's the combined effect of less admin, faster billing and fewer avoidable losses. Here is roughly how a saving of that size breaks down. These are the contractor's own estimates of the main contributing sources, not separately audited sub-metrics.
| Where it comes from | Per week |
|---|---|
| Office admin hours no longer spent re-keying timesheets, valuations and applications | £1,150 |
| Faster, more accurate invoicing & improved cashflow (less time chasing, fewer disputed lines) | £900 |
| Previously-missed variations now captured and billed | £850 |
| Retention & CIS deductions tracked and recovered correctly | £600 |
| Fewer costly errors and re-work from out-of-date or duplicated information | £300 |
| Less double data entry across payroll, costing and reporting | £250 |
| Total recovered each week | £4,050 |
The largest single contributor is simply time: hours that used to go on shuffling the same numbers between systems now go into the work. The rest is money that was already owed to the business but was slipping through the cracks before everything sat in one place.
"We didn't expect a headline number - we just wanted the admin under control. Once the timesheets, approvals and invoicing were in one place, we could see what we'd been losing. Getting variations and retention right alone more than paid for it."— Commercial Director, Kent-based M&E contractor
Could you see similar results?
Honestly: maybe, maybe not. This is one customer's experience, and their numbers reflect their size, their mix of work and how fully their team took to the platform. A smaller firm with less admin to begin with would see a smaller figure; a larger one with messier processes might see more.
What tends to hold true across customers is the shape of the saving rather than the exact amount - less re-keying, tighter billing, and fewer things falling through the cracks. The size of the prize depends on how much of that you're carrying today and how completely you switch over.