Document Approval Workflow App Cost in London (2026)

The verdict in three sentences

A document approval workflow app costs 9,000 to 23,000 EUR (about £7,800 to £19,800) when built by a nearshore team, and ships in about 10 weeks. With three-level approval chains, electronic signature and automatic reminders, a purchase order that used to wait 5 days is approved in 1 day. Budget depends mainly on the number of document types, threshold rules and integration with your accounting software. A comparable build from a London agency is often quoted at 2 to 3 times that amount.

What you get for each budget

In many companies, a purchase order, purchase request or expense claim still moves by email attachment and printed sign-off: requester, then department head, then CFO, then CEO. If one of them is travelling, everything stops.

Payment is usually split in 3 installments (40%, 30%, 30%). Amounts cover analysis of existing approval chains, development, acceptance testing and approver training.

Example 3-level chain and time savings

The principle: threshold rules automatically decide who must sign. A 450 EUR purchase order does not go up to the CEO, a 38,000 EUR commitment does.

Every signature is timestamped and recorded with the approver's identity. In the UK, the Electronic Communications Act 2000 and UK eIDAS recognise electronic signatures, so paper can be dropped for most internal documents. For high-stakes contracts, a qualified signature provider can be plugged in for roughly 0.80 to 3 EUR per signature.

What makes the project succeed

Map the real approval chains before writing a line of code, since the official chain often differs from practice. Make the app usable on smartphones, because executives often approve from their phone between meetings. Build delegation in from day one: without it, one absent approver recreates exactly the bottleneck you set out to remove.

Mini case study

Sophie, CFO of a distribution company in London, handles 250 purchase orders a month, each waiting 5 days on average for signatures. The delays cause stock-outs and rush purchases, with an estimated 3% premium on 91,000 EUR of monthly purchasing, or 2,730 EUR. Internal printing, scanning and chasing cost another 380 EUR a month. She picks the Standard package at 15,200 EUR. Approval time falls to 1 day, rush purchases drop 70% (saving 1,910 EUR) and the manual chasing disappears. Monthly gain: 2,290 EUR, minus 150 EUR hosting, or 2,140 EUR net. The project pays back in just over 7 months.

FAQ

Is an electronic signature legally valid in the UK?

Yes, the Electronic Communications Act 2000 and UK eIDAS give it legal effect. For internal documents, a timestamped signature with an audit trail is enough in the vast majority of cases.

Can executives approve from their phone?

Yes, the app is mobile-first and works on slow connections. An approval takes under 30 seconds, notification included.

Can the app connect to our accounting software?

Yes, with Xero, Sage, QuickBooks, Odoo or any ERP that has an API or export. The connector usually costs 2,300 to 4,600 EUR depending on the software.

What if an approver does not respond?

An automatic reminder goes out after 24 hours by email and SMS, then the document moves to the named deputy. No order stays blocked for more than 48 hours.

How long does team training take?

Half a day for requesters and 1 hour for approvers is enough. Most companies drop the paper chain within 2 to 3 weeks.

Let's scope your project. Describe your document types, approval thresholds and monthly volume: we will price your app between 9,000 and 23,000 EUR with a 10-week plan. Detailed quote within 48 h. WhatsApp +221 77 596 93 33.