The verdict in three sentences
For a London wholesaler supplying 350 retailers with rice, cooking oil and sugar, a custom order management web app costs £35,000 to £70,000 (about 41,000 to 82,000 EUR) depending on scope, with a 3-month delivery. The non-negotiable feature is offline mode: field reps must take an order in a basement shop in Tottenham or a cash-and-carry with no signal, then sync later. The fastest payback comes not from order entry but from credit control, which typically cuts overdue debt by around 30 % within two quarters.
What the app must cover, and at what price
Phone calls and spreadsheets work while the owner knows every customer. Past 200 active accounts, errors pile up: wrong quantities, forgotten discounts, deliveries made to a shop already owing £8,000. The app replaces this with a single database: catalogue, volume price tiers, orders, deliveries, payments and customer balances.
| Module | Scope | Indicative 2026 budget |
|---|---|---|
| Catalogue and volume pricing | 25 and 50 kg sacks, drums, cases, tiered prices | £5,000 to £9,000 |
| Offline field rep app (PWA) | Order entry without signal, automatic sync | £10,000 to £20,000 |
| Credit control | Credit limits, automated reminders, hold above limit | £6,000 to £11,000 |
| Deliveries and dispatch notes | Routes, signature on phone, proof of delivery | £4,000 to £9,000 |
| Card and bank payment matching | Open Banking or card payments reconciled automatically | £4,000 to £8,000 |
| Owner dashboard | Sales by product, rep, postcode, gross margin | £6,000 to £13,000 |
| Total | Depending on modules and users | £35,000 to £70,000 |
A minimal version (catalogue, offline orders, credit control) sits around £35,000. The full version with deliveries, payment matching and a detailed dashboard approaches £70,000.
Offline mode: how it really works
The app is a PWA (an installable web app on Android or iOS). The catalogue, prices and each customer's balance are stored on the rep's phone. The rep enters the order, the phone saves it locally and sends it as soon as 4G or depot wifi returns. Conflicts (two orders on the same stock) are resolved by the server, which flags stock-outs to the rep.
| Criterion | Phone and spreadsheet | Off-the-shelf wholesale software | Custom offline app |
|---|---|---|---|
| Upfront cost | £0 | £3,000 to £10,000 setup | £35,000 to £70,000 |
| Monthly cost | Owner's time | £400 to £1,500 in licences | £1,200 support plan |
| Order entry without signal | Yes (paper) | Rarely | Yes, with sync |
| Volume pricing per customer | From memory | Partial | Full, by tier and account |
| Automatic credit hold | No | Sometimes | Yes, at the set limit |
| Payment reconciliation | Manual | Partial | Automatic |
| Time to go live | Immediate | 4 to 8 weeks | 3 months |
Off-the-shelf software remains a fair option under 100 accounts. Beyond that, weak offline support and rigid credit rules make it a poor fit for a busy wholesale operation.
Timeline and running costs
The project runs in three phases: scoping and mock-ups (3 weeks), development and testing with two pilot reps (8 weeks), rollout and training (2 weeks). A support plan around £1,200 per month covers hosting, security updates, daily backups and a few hours of fixes. Budget 10 to 15 % of the initial cost per year for new features (new product lines, a second depot).
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David, managing director of a food wholesaler in north London, turns over £9 million a year. Customer debt averages £700,000, of which £90,000 is written off annually. He invests £55,000 in the app and pays £14,400 a year in support. With automatic credit holds and reminders, bad debt falls 30 %, recovering £27,000 a year. Entry errors and forgotten discounts, estimated at 0.5 % of revenue, are halved: another £22,500. Annual gain: £49,500, against £69,400 in first-year cost. After support costs, net gain is about £35,100 a year: the investment pays back around month 19.
FAQ
How much does a wholesale order management app cost in London?
Expect £35,000 to £70,000 in 2026 depending on modules. A core build with offline orders and credit control starts around £35,000.
Does the app work without internet?
Yes, reps enter orders without signal and sync happens automatically when the connection returns. The catalogue and customer balances refresh at each sync, usually several times a day.
How long does it take to go live?
About 3 months: 3 weeks of scoping, 8 weeks of development with pilots, 2 weeks of rollout. The first reps can use it from week 9.
What phones do field reps need?
Any recent mid-range Android or iPhone, from about £150, works. The app takes under 50 MB.
What does the £1,200 monthly support plan include?
Hosting, daily backups, security patches and a block of support hours. New features are quoted separately, typically 10 to 15 % of the initial budget per year.
Let's scope your project. Send us your number of accounts, reps and depots and we will return a scope, an indicative budget and a realistic timeline. Detailed quote within 48 h. WhatsApp +221 77 596 93 33.
Mohamed Bah
Fondateur, Kolonell
Passionate about digital and entrepreneurship in Africa, Mohamed has been helping Sénégalese businesses with their digital transformation since 2020. Founder of Kolonell, he believes every SME deserves a professional and accessible online présence.
