The verdict in three sentences
When a procurement group manages 900 suppliers through email and spreadsheets, the real cost is not the missing tool, it is the time spent chasing expired documents and the legal risk of a non-compliant supplier. A custom supplier portal with document upload, expiry checks and automatic reminders costs 30,000 to 56,000 GBP in 2026, plus about 7,000 GBP for the ERP connection, over 4 to 5 months. The target saving is 2 days per week of checks for the procurement team, close to 100 days a year.
What the portal must check: the document list
The procurement director of a London buying group must be able to prove, at any moment, that every approved supplier is compliant. Insurance certificates, Modern Slavery Act statements for larger suppliers, health and safety policies and bank details all have their own renewal rhythm. In practice, across 900 suppliers, dozens of documents expire every week.
| Document | Renewal frequency | Automatable check | Portal action |
|---|---|---|---|
| Companies House record | Checked at onboarding and yearly | Company number, status | Alert if status changes |
| Public and employer's liability insurance | Yearly | End date, cover amount | Buyer alert at D-30 |
| Modern Slavery Act statement | Yearly if turnover above 36 M GBP | Presence, publication date | Automatic reminder |
| Health and safety policy | Yearly | Version, date | Reminder at D-15 |
| Bank details | On every change | Sort code, account, dual approval | Anti-fraud check before payment |
| Price agreements | Yearly or half-yearly | Version, effective date | Buyer approval workflow |
| Certifications (ISO, Cyber Essentials) | Variable | End date | Supplier score updated |
The sensitive point is bank details: mandate fraud, where a fake email asks to change a supplier's account, remains one of the costliest scams for procurement teams. The portal enforces dual approval and a logged phone confirmation before any change.
Features and 2026 budget
The scope has three building blocks: the supplier space (registration, uploads, updates), the buyer back office (approval, scoring, search) and automation (reminders, blocking, ERP sync).
| Block | Features | 2026 range (GBP, ex VAT) |
|---|---|---|
| Supplier space | Registration, questionnaire, uploads, multiple contacts | 7,700 to 13,000 |
| Buyer back office | Approval, statuses, search by spend category | 6,900 to 12,000 |
| Compliance engine | Expiry dates, reminders, blocking, history | 6,000 to 11,200 |
| Supplier scoring | Quality, lead time, ESG scores, dashboard | 4,300 to 8,600 |
| Security and UK GDPR | SSO, audit log, UK hosting | 2,600 to 6,000 |
| Testing and training | Tests, migration of 900 records, buyer training | 2,500 to 5,200 |
| ERP connection | Create and update vendors, statuses | about 7,000 |
Total: 30,000 to 56,000 GBP without ERP, 37,000 to 63,000 GBP with it. Maintenance and hosting then run 500 to 1,000 GBP per month depending on service level. Off-the-shelf supplier management platforms start around 1,300 to 3,500 GBP per month at this volume, with less flexibility on the group's own business rules.
Project timeline over 4 to 5 months
Month one is discovery: document list per supplier category, blocking rules, buyer roles. Months two and three cover building the supplier space and back office. Month four is dedicated to the ERP connection and migrating existing data. The final month is testing and a phased launch: 100 pilot suppliers, then the full panel in waves of 200.
Mini case study
Sarah, procurement director of a buying group in London, manages 4 buyers and 1 assistant who spends much of her time checking documents. In total, the team spends 2 days a week on checks and reminders, about 96 days a year. At an average loaded cost of 330 GBP per day, that is 31,700 GBP a year.
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Sarah picks a 45,000 GBP portal including the ERP connection, plus 780 GBP per month of maintenance. If the portal removes 80 % of manual checks, savings reach 25,400 GBP a year, against 9,360 GBP of maintenance. The net gain of 16,000 GBP a year pays back the investment in just under 3 years, before counting the reduced legal and mandate fraud risk, which remains the strongest argument for the board.
FAQ
How much does a custom supplier portal cost in 2026?
For a group managing about 900 suppliers, budget 30,000 to 56,000 GBP as a ballpark, plus about 7,000 GBP for the ERP connection. Maintenance then runs 500 to 1,000 GBP per month.
What timeline should we plan?
The project usually takes 4 to 5 months, including 1 month of discovery and 1 month of testing. Rollout to 900 suppliers happens in waves of 100 to 200 to keep support load manageable.
Can the portal automatically validate an insurance certificate?
It checks the end date and cover amount entered by the supplier, then a buyer confirms against the uploaded certificate. The supplier status switches to "blocked" automatically on the expiry date.
Should we choose an off-the-shelf platform instead?
A SaaS platform costs 1,300 to 3,500 GBP per month at this volume and deploys faster. Custom development makes sense when onboarding rules, scoring or the ERP connection are specific to the group.
How do we get suppliers to adopt the portal?
A registration flow under 15 minutes, automatic reminders and a clear rule ("no purchase order without a complete file") usually reach 85 to 90 % adoption within 3 months.
Let's scope your project. Share your document list and supplier count: we will price the portal, the ERP connection and the phased rollout plan. 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.
