The verdict in three sentences
A B2B ecommerce site with customer-specific pricing and ERP sync costs between USD 55,000 and 176,000 all-in around New York in 2026 (market order of magnitude), for 4 to 6 months of work. Budget overruns almost never come from the catalogue or the design: they come from cascading discounts, free-freight rules and online quoting, three topics rarely priced at the start. A CIO who has them specified before the RFP reduces the gap between quote and final invoice by 20 to 40%.
Cost items of a B2B project in New York
The typical case: a medical equipment manufacturer (care devices, consumables, hospital furniture) selling to 2,000 customers, clinics, pharmacies, nursing homes and distributors, each with a negotiated price list stored in the ERP. The site must show the right price to each logged-in customer, the right stock and the right delivery terms.
| Item (2026 market estimate, New York area) | Range | Share of budget |
|---|---|---|
| Scoping, workshops and specifications | USD 5,500 to 16,500 | 8 to 10% |
| UX design and mockups (customer area, quick order) | USD 6,600 to 20,000 | 10 to 12% |
| B2B site development (catalogue, accounts, ordering) | USD 27,500 to 88,000 | 45 to 55% |
| ERP sync (prices, stock, orders, invoices) | USD 11,000 to 44,000 | 20 to 25% |
| Testing, account migration, training | USD 4,400 to 11,000 | 5 to 8% |
| Total project | USD 55,000 to 176,000 | 100% |
| Annual maintenance and hosting | 15 to 20% of project | recurring |
In New York, a senior ecommerce developer bills USD 130 to 190 per hour in 2026, which explains most of the gap with other regions.
At Kolonell, a project of this scope falls within the complex application band: 7,000,000-15,000,000+ FCFA (EUR 10,670-22,870+ excl. VAT), with maintenance at 35,000, 75,000 or 120,000 FCFA per month. The amounts in the table above remain New York market estimates, not Kolonell prices.
The three underestimated items
| Topic | What gets forgotten | Typical overrun if discovered mid-project |
|---|---|---|
| Cascading discounts | customer discount, then family discount, then volume discount, then promotion, in a precise order that must match the ERP to the cent | USD 8,800 to 16,500 |
| Free freight and shipping | free-freight threshold per customer, per zone (Manhattan, upstate, out of state), rush surcharge, healthcare facility delivery with time slot | USD 3,300 to 8,800 |
| Online quoting | cart turned into a quote request, approval by a sales rep, signed quote converted into an order | USD 11,000 to 22,000 |
| Approval workflows | spending limit per buyer, approval by the pharmacist or nurse manager | USD 5,500 to 13,200 |
| Regulatory traceability | lot numbers, FDA unique device identifier, expiry date displayed | USD 4,400 to 11,000 |
Price calculation is the heart of the matter. Two architectures exist: copy ERP price lists into the site every night (fast display, risk of drift), or query the ERP in real time for every cart (always accurate prices, but dependent on ERP availability). For 2,000 customers, the common solution combines a nightly copy with a real-time recalculation when the order is confirmed.
Mini case study
Jennifer, CIO of a 180-employee medical equipment manufacturer on Long Island, receives a first quote of USD 93,500: site USD 66,000 and ERP sync USD 27,500. In workshops, she has cascading discounts (USD 13,200), zone-based free freight (USD 5,500) and online quoting (USD 16,500) priced: the project rises to USD 128,700, with annual maintenance of 18%, i.e. USD 23,200. Over 3 years, total cost reaches USD 175,100. On the other side, if 35% of 24,000 annual orders move online and each online order saves USD 13 in processing, the gain is USD 109,200 a year, about USD 327,600 over 3 years. Discovering those three items mid-project would have cost more and delayed launch by 2 months. Illustrative scenario.
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FAQ
Why does a B2B site cost more than a B2C site?
Because commercial logic is individual: 2,000 customers, potentially 2,000 different prices for the same product. ERP sync alone accounts for 20 to 25% of the budget, i.e. USD 11,000 to 44,000.
Can we use a SaaS platform instead of custom build?
Yes, B2B SaaS platforms start around USD 1,650 to 3,300 a month. They fit if your discounts follow standard rules, much less if your ERP holds customer-specific exceptions built up over 15 years.
What timeline should we plan?
Allow 4 to 6 months: 4 to 6 weeks of scoping, 10 to 14 weeks of development and integration, 3 to 4 weeks of testing with pilot customers.
How do we avoid price gaps between the site and the invoice?
By validating the pricing engine on a sample of 200 customer-product pairs pulled from the ERP before launch, with a 100% match to the cent as the target.
What maintenance should we budget?
15 to 20% of project cost per year, i.e. USD 8,250 to 35,200 for a USD 55,000 to 176,000 project. It covers security updates, ERP changes and small business requests.
Let's scope your project. Number of customers, discount structure, current ERP: we price your B2B site item by item, including the often forgotten topics, through our quote request. 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.
