A UK industrial distributor we spoke to last month was selling £22m annually to 800 trade customers via phone, email, and PDF order forms. Their sales operations team of 6 people spent 60 percent of time on repeat orders that customers could have placed themselves. Two of their newer competitors had launched B2B portals in 2024-2025 and were taking market share. Their MD had £250k budget and 8 months to launch a competitive portal. His question was whether Shopify B2B would handle their contract pricing complexity or if he needed BigCommerce or custom.
That is the B2B e-commerce conversation across UK and US manufacturers and distributors in 2026. B2B buyer expectations have caught up with B2C: they want portal self-service, real-time pricing, reorder history, and mobile access. B2C platforms poorly handle multi-user accounts, contract pricing, approval workflows, and ERP integration. Shopify Plus B2B has matured to cover most simpler cases; BigCommerce B2B is strong mid-market; enterprise still needs Adobe Commerce, commercetools, or custom.
This article is for CEOs, Sales Directors, and Heads of Digital. What differs from B2C. Vendor comparison. Contract pricing and approvals. Real costs. Failure modes.
How B2B E-commerce Differs from B2C
Six differences that break B2C platforms when used for B2B.
Multi-user accounts. B2B customer account has multiple users: buyers who place orders, approvers who authorise, admins who manage user access, finance who view invoices. B2C is one user per account.
Contract-specific pricing. Every B2B customer sees prices negotiated in their contract, which vary by product, quantity band, promotion period, and sometimes region. B2C has one price for everyone.
Approval workflows. Purchases above threshold require approval from designated approver before order submission. Complex organisations have multi-step approvals by product category or business unit. B2C has no approval concept.
Net terms invoicing. B2B pays on net 30, 60, or 90 terms with credit limits and invoice-based reconciliation. B2C pays on checkout with card or wallet.
Reorder from history. Repeat orders drive 60-80 percent of B2B volume. Portal must make reorder trivial (one-click from history, standing orders, saved order templates). B2C reorder is rare enough to be a nice-to-have.
ERP and PIM integration. B2B needs deep integration with buyer's SAP, NetSuite, or Microsoft Dynamics for punchout and back-office systems for inventory, pricing, and orders. B2C typically integrates to a simpler stack.
The McKinsey B2B buyer trends 2026 research shows B2B buyers now expect the same self-service experience they get in B2C but with all six B2B-specific capabilities intact.
The 6 Capabilities B2B Needs That B2C Does Not
Non-negotiable requirements when evaluating platforms.
1. Multi-user account hierarchies. Company account with sub-accounts, role-based permissions (buyer, approver, admin, finance viewer), user management by customer admin without vendor support tickets.
2. Contract-specific pricing per customer. Price lists assigned to customer accounts. Rules by product, quantity band, promotion, and region. Volume-break pricing that recalculates in real time.
3. Multi-step approval workflows. Configurable approval rules by purchase amount, product category, or business unit. Notifications, approval interface, order held until approved.
4. Net terms invoicing and credit management. Credit limit per customer. Automated hold if order exceeds available credit. Invoice generation and delivery. Payment terms enforcement.
5. Quick reorder and standing orders. One-click reorder from history. Standing orders for scheduled repeat purchases. Saved order templates for regular baskets.
6. ERP and PIM integration. Real-time inventory from ERP. Pricing sync from ERP or PIM. Order push to ERP for fulfilment. Punchout support for buyers using SAP Ariba, Coupa, or similar.
When platform fails a capability, buyers revert. Clumsy reorder means phoned-in orders. Print-and-sign approval means email workarounds. Every workaround erodes the portal's ROI.
Shopify B2B vs BigCommerce B2B vs Custom
Five viable options in the 2026 landscape.
Shopify Plus B2B. Matured significantly in 2025-2026. Now handles multi-user accounts, company profiles, contract pricing, quick reorder, and basic approval. £2,500-£30k/month depending on volume plus per-order fees. Best for brands under £30m ARR with simpler B2B needs.
BigCommerce B2B Edition. Strong quote-to-cash workflow, mature contract pricing, robust approval workflows. £2k-£25k/month. Best for mid-market with more complex B2B needs than Shopify handles.
Adobe Commerce (Magento) B2B. Enterprise B2B platform with the deepest feature set. £30k-£300k/year licensing plus £150k-£800k implementation. Best for large enterprises with complex requirements and existing Adobe ecosystem.
commercetools B2B. Composable enterprise B2B. £8k-£50k/month plus implementation. Best for brands wanting composable architecture with strong B2B extensions.
Custom builds. £250k-£1.5m plus over 12-20 months. Defensible for unusual product configuration (industrial products with complex specifications), industry-specific workflow (medical devices with regulatory requirements), or existing platform hitting hard limits.
The Gartner B2B digital commerce research publishes Magic Quadrants for B2B digital commerce that most enterprise buyers work through before shortlisting.
Handling Contract Pricing and Approval Workflows
Two capabilities that most often trip up platform selection.
Contract pricing rules. Pricing must support: customer-specific price lists, quantity-break pricing (£10 at 1-10 units, £8 at 11-50, £6 at 51 plus), contract-period pricing (special prices for defined date range), product-family discounts (X percent off entire category), and combination rules (customer plus quantity plus category).
Approval workflow design. Common patterns: pre-approved catalogue (any item auto-approves), amount-based routing (over £5,000 requires manager, over £25,000 requires director), category-based routing (chemicals require safety officer, IT hardware requires IT lead), split approvals (finance and technical both required for capital purchases).
Integration with buyer's procurement system. Larger customers use SAP Ariba, Coupa, or Oracle Procurement. Punchout support lets buyers hit your catalogue from within their procurement system, complete the order, and return the cart for approval and PO generation. Punchout is table stakes for enterprise B2B.
When to invest in custom vs configure. Shopify B2B and BigCommerce B2B handle 80 percent of contract pricing and approval scenarios through configuration. Custom becomes necessary for unusual pricing rules, non-standard approval workflows, or deep integration with proprietary procurement systems.
Real 2026 Cost Bands
Build cost by platform tier.
Small B2B on Shopify Plus B2B: £40k-£120k over 3-5 months
Mid-market B2B on BigCommerce B2B: £100k-£350k over 5-9 months
Enterprise B2B on Adobe Commerce: £300k-£800k over 8-14 months
Enterprise B2B on commercetools: £400k-£1.2m over 10-14 months
Fully custom B2B: £500k-£2m plus over 12-20 months
Ongoing platform cost (annual).
Shopify Plus B2B: £30k-£360k (platform plus per-order fees)
BigCommerce B2B: £24k-£300k
Adobe Commerce: £30k-£300k licensing plus £100k-£400k support
commercetools: £100k-£600k
Custom: £120k-£600k engineering and infrastructure
Break-even. Cloud platforms (Shopify, BigCommerce) win for brands under £30m ARR. Enterprise platforms (Adobe, commercetools) or custom become defensible above £50m ARR with complex requirements.
What We See Across B2B Builds
Two patterns recur across engagements.
ERP integration is the biggest budget killer. Teams underestimate the effort to sync inventory, pricing, and orders with existing SAP, NetSuite, or Microsoft Dynamics. Realistic integration budget: 20-40 percent of total build cost. Budget accordingly from day one.
Reorder workflow determines adoption. Portals with clumsy reorder (search, add, checkout) fail; portals with one-click reorder from history succeed. Repeat orders are 60-80 percent of B2B volume; the reorder experience is 60-80 percent of the portal's value.
We built TrackVid, a video proof and claim management platform used by ecommerce sellers including B2B brands where claim disputes on damaged goods were eating margin. Integration with B2B commerce platforms via API delivered claim reduction of 30-40 percent on typical B2B customer bases.
You can see our shipped work at our portfolio. If you want a candid conversation about your specific B2B decision, book a B2B commerce call with WhiteStone.
Common Failure Modes
Choosing B2C platform for B2B needs. Team picks standard Shopify (not Plus B2B) or WooCommerce for B2B use case. Missing multi-user accounts, contract pricing, and approval workflow. Team layers custom workarounds; system becomes fragile within 12 months.
Under-scoping ERP integration. Team budgets £30k for integration; actual scope requires £120k. Project delayed 4-6 months; over budget by 50 percent.
Missing the reorder workflow. Portal launches with strong browse and checkout but weak reorder. Buyers revert to phone within 3 months. Portal adoption stalls below 25 percent.
Frequently Asked Questions
How is B2B ecommerce different from B2C?
Six differences: multi-user account hierarchies, contract-specific pricing per customer, multi-step approval workflows, net terms invoicing, quick reorder from history (60-80 percent of B2B volume is repeat orders), and ERP/PIM integration. B2C platforms handle these poorly or not at all.
Shopify B2B or custom platform?
Shopify Plus B2B (£40k-£120k build) for brands under £30m ARR with simpler needs. BigCommerce B2B (£100k-£350k) for mid-market. Adobe Commerce or commercetools for enterprise. Custom (£500k-£2m plus) only for unusual product configuration or industry-specific workflow that platforms cannot handle.
How do you handle contract pricing and approval workflows?
Contract pricing: customer-specific price lists with rules by product, quantity, contract period, and region. Approval workflows: routing by amount, product category, or business unit with configurable steps. Standard on Shopify Plus B2B, BigCommerce B2B, Adobe Commerce, and commercetools; custom needed only for unusual rules.
What is punchout and do we need it?
Punchout lets enterprise customers hit your catalogue from within their procurement system (SAP Ariba, Coupa, Oracle), complete the order, and return for approval and PO generation. Table stakes for enterprise B2B; not needed for SMB-only B2B.
How much does a B2B ecommerce platform cost to build in 2026?
Small B2B on Shopify Plus B2B: £40k-£120k build, £30k-£360k annually. Mid-market on BigCommerce: £100k-£350k build, £24k-£300k annually. Enterprise on Adobe Commerce or commercetools: £300k-£1.2m build, £130k-£900k annually. Fully custom: £500k-£2m plus.
The One Thing to Remember
B2B e-commerce differs materially from B2C on six specific capabilities: multi-user accounts, contract pricing, approval workflows, net terms, reorder from history, and ERP/PIM integration. Cloud platforms (Shopify Plus B2B, BigCommerce B2B) now cover most mid-market needs cost-effectively; enterprise platforms or custom become defensible only above £50m ARR with unusual requirements. Budget 20-40 percent of total build for ERP integration; underscoping it is the biggest budget killer. Design reorder workflow first; 60-80 percent of your portal's value is repeat orders.
If you want a candid conversation about your B2B platform decision, browse our custom software development services or come to the call.
