Most businesses hiring a B2B eCommerce agency end up with a store that looks like B2C with a login screen in front of it. This guide covers what a genuine B2B specialist actually builds, why B2B and B2C eCommerce are fundamentally different disciplines, and what to look for before signing a contract.
B2B leads generated for 5MS clients via eCommerce
Monthly sessions across 5MS B2B eCommerce stores
Client retention rate since 2011
Years building B2B eCommerce for UK manufacturers
A B2B eCommerce agency builds and optimises online stores that serve business buyers rather than consumers. The work covers company account architecture, account-level pricing and catalogue control, ERP and CRM integration, procurement-friendly UX, and SEO and GEO strategy tuned to how trade buyers search. It is a different discipline from B2C eCommerce in almost every dimension: the platform requirements, the buyer journey, the checkout logic, and the content strategy are all different. Most agencies that say they do B2B are B2C agencies that have added a login screen.
The gap between B2B and B2C eCommerce is wider than most businesses realise when they start scoping a project. Surface-level differences like pricing tiers and login requirements are obvious. The deeper differences — in how buyers make decisions, how platforms need to be architected, and how success is measured — are what most generic agencies miss entirely.
| Dimension | B2C eCommerce | B2B eCommerce |
|---|---|---|
| Buyer | Single consumer | 3 to 7 stakeholders |
| Pricing | Public price list | Account-specific, negotiated |
| Payment | Card at checkout | Invoice, 30/60 day net terms |
| Order pattern | Browse and discover | Repeat order by SKU |
| Approval | None required | Multi-level sign-off workflows |
| Catalogue | Same for everyone | Segmented by account |
| Back-office | Optional ERP sync | Real-time ERP integration essential |
A B2C agency can design a beautiful store. They cannot architect company account hierarchies, build quote negotiation workflows, or integrate with SAP in a way that handles credit limits in real time at checkout. These are different disciplines requiring different experience. An agency that has not built B2B specifically before will learn on your project.
The generational shift: 73% of B2B buyers are now millennials or Gen Z. They expect to self-serve online for everything — quotes, reorders, invoice downloads, account management. They do not want to call a sales rep. The businesses that have built proper B2B eCommerce are winning accounts from those that have not.
The work of a genuine B2B eCommerce agency falls into five areas. Each requires specific experience. Each is different from what a B2C agency delivers.
Company accounts with sub-users, role-based permissions, and spending limits. Requisition lists, quote workflows, order history, invoice downloads. The self-serve infrastructure that lets trade buyers manage their account without contacting your team. This is the highest-impact area for reducing account management cost.
Customer group tiers, per-account contract rates, volume breaks, shared catalogues with account-specific product visibility. The pricing system for a B2B store is an architectural decision with long-term consequences. Built incorrectly, it breaks under edge cases and requires workarounds that cost more than building it right the first time.
Real-time inventory, bidirectional order sync, live ERP pricing, credit limit enforcement at checkout, customer account data from the ERP surfaced in the portal. Without this, the store is manual order entry with a better interface. 5MS integrates with Sage, SAP, Dynamics, NetSuite, Epicor, and Kerridge. The integration scope is almost always larger than it looks at discovery.
Quick order by SKU, reorder shortcuts, procurement-focused checkout with PO number fields, payment on account, multi-address management, and mobile UX built for field users rather than browsers. B2B UX prioritises speed and efficiency over aesthetics. A procurement manager placing a 200-line order does not care how the hero image animates.
B2B buyers search by specification, part number, and trade category. The keyword strategy, content architecture, and technical SEO for a B2B store are entirely different from B2C. Generative engine optimisation (GEO) — structuring content to earn AI search citations — is now a serious B2B acquisition channel. See our guide to GEO for eCommerce for detail.
The 5MS result: across our B2B portfolio, clients generate 2,541 leads and 198,000 monthly sessions. The accounts that generate the most are the ones with self-serve adoption above 60% — procurement teams that can reorder, request quotes, and download invoices without calling anyone.
Platform choice is the most consequential early decision in a B2B eCommerce project. The right platform removes friction. The wrong one forces expensive workarounds from day one. For UK B2B businesses, the three realistic options are Adobe Commerce (Magento), Shopify Plus, and WooCommerce.
Adobe Commerce is the strongest platform for complex B2B because it ships company accounts, shared catalogues, negotiable quotes, quick order, requisition lists, payment on account, and PO approval workflows as native features. No extensions required. For a full breakdown, see our guide to Magento B2B features.
Shopify Plus is viable for mid-market B2B with moderate complexity, particularly where brand experience and speed to market are priorities. Its B2B feature set is growing but still has gaps on shared catalogues and PO approval.
WooCommerce suits smaller B2B operations with straightforward pricing and no ERP dependency. It becomes expensive quickly once plugin stacks are added for B2B functionality.
Shopify’s marketing is strong and their B2B product is genuinely improving. But businesses with complex pricing architectures, multiple customer groups with different catalogues, and live ERP integration requirements consistently hit Shopify’s limits within 18 months. The rebuild cost exceeds the original build cost. Spec your requirements fully before making a platform decision.
ERP integration is the most frequently underscoped area in B2B eCommerce projects. Agencies quote “sync orders and inventory” as a line item and move on. In practice, ERP integration means mapping every field in the eCommerce order model to the ERP order model, handling partial shipments and back-orders, managing order status across both systems without creating duplicates, dealing with ERP validation rules that reject orders the store has already accepted, and building error handling that does not silently lose orders.
5MS integrates with Sage 200, Sage 50, Microsoft Dynamics 365 Business Central, SAP Business One, SAP S/4HANA, NetSuite, Epicor, and Kerridge. Each requires a purpose-built integration. An agency quoting ERP integration without a discovery phase is guessing at the scope.
Any agency offering a fixed price for ERP integration without a paid discovery phase has not done one before, or is pricing the risk into the build and hoping you do not notice the change requests. ERP integrations are scoped after discovery, not before it.
Applying B2B pricing as discounts off the public price list rather than as a native pricing architecture. Breaks under edge cases and creates pricing conflicts that take years to untangle.
Treating ERP integration as a simple data sync. Every edge case (partial shipments, back-orders, credit limit holds, split deliveries) adds weeks of integration work that was not in the original scope.
Building the store and assuming accounts will figure it out. B2B accounts that receive no onboarding sequence after approval activate at far lower rates than those who receive a structured introduction to the portal and its features.
Optimising for broad category terms rather than the specific technical queries B2B buyers use. A manufacturer searching for “304 stainless hex bolts M8 DIN 933 next day UK” is not served by a page optimised for “stainless bolts”.
Building the digital channel as a separate project from the sales process. The sales team knows which accounts are at risk of lapsing, which buying workflows create friction, and which features would accelerate adoption. Not involving them produces a store that works technically but fails commercially.
Designing the architecture around current order volumes and account counts rather than the volume the eCommerce channel is supposed to generate. B2B eCommerce is supposed to grow the business. Build for where you are going, not where you are.
Six questions to ask any agency before you engage them for B2B eCommerce work:
- 1Show me a B2B store you have built with company accounts and shared catalogues. Not a B2C store with a login. A genuine B2B store with multi-user company accounts, role-based permissions, and account-specific pricing. If they cannot show you one, they have not built one.
- 2Which ERPs have you integrated with and what was the scope? The right answer names specific ERPs, specific integration approaches, and specific edge cases they encountered. A vague answer about “API connections” is a sign of limited experience.
- 3How do you handle pricing architecture for accounts with individually negotiated rates? This question separates agencies that have built B2B from agencies that think they have. The right answer involves shared catalogues, per-account price overrides, and a discussion of how this interacts with promotions.
- 4What does your discovery process cover for a B2B project? A B2B project requires discovery into pricing rules, ERP data model, account hierarchy, approval workflows, and buying patterns. An agency offering to skip discovery or do it in a day has not thought about what they do not know yet.
- 5What results have your B2B clients seen in terms of self-serve adoption and order frequency? An agency that cannot give you numbers from their existing B2B clients is either not tracking them or does not have enough B2B clients to have meaningful data.
- 6Who specifically will work on our project and what B2B projects have they built? Agencies win work with their senior team and deliver with their junior team. Get the names of the developers and solution architects assigned to your project and ask about their B2B experience specifically.
- A B2B eCommerce agency is not a B2C agency with B2B clients. The platform requirements, buyer journey architecture, pricing systems, ERP integration, and SEO strategy are all different disciplines requiring specific experience.
- The five areas of genuine B2B eCommerce agency work are: account portal architecture, pricing architecture, ERP integration, B2B UX and checkout, and B2B SEO and GEO strategy. A gap in any of them produces a store that underperforms.
- Adobe Commerce is the strongest platform for complex B2B because it ships all eight major B2B features natively. Shopify Plus suits moderate complexity. WooCommerce suits simple requirements without ERP.
- ERP integration is almost always underscoped. Any agency offering a fixed price without a discovery phase is guessing. The integration scope becomes clear only after mapping the data model, edge cases, and business rules on both sides.
- Six questions separate a genuine B2B agency from one that says they do B2B. Ask for B2B case studies, ERP integration specifics, pricing architecture detail, discovery process, client results, and who specifically will work on the project.
We scope B2B eCommerce projects every week. Bring us your requirements, your ERP, and your timeline. We will tell you straight what the build costs, how long it takes, and which platform makes sense for your specific situation.
A B2B eCommerce agency builds online stores designed for business buyers: company account portals with sub-users and approval workflows, account-specific pricing and catalogue control, ERP integration for real-time inventory and order sync, procurement-focused UX with quick order and payment on account, and B2B SEO and GEO strategy. It is a different discipline from B2C eCommerce in platform requirements, buyer journey design, pricing architecture, and content strategy. Most agencies that claim to do B2B are B2C agencies that have added a login screen. The difference shows in the results.
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Common questions about B2B eCommerce agencies. Not answered here? Get in touch.
We scope B2B eCommerce projects every week. Bring us your requirements, your ERP, and your timeline. We will tell you straight what the build costs, how long it takes, and which platform makes sense.