Fulfilment Centre USA: What UK eCommerce Brands Need to Know Before Expanding

TL;DR

Shipping to US customers from the UK means slow delivery times and high shipping costs that can kill conversion rates. A fulfilment centre in the USA solves this by placing your stock in-market, letting you hit domestic delivery speeds and absorb duties upfront. US 3PLs handle customs paperwork, pick and pack, and returns — but choosing the wrong one can cost more than staying home. Location, WMS integrations, and returns handling need to be sorted before you sign anything.

Key Takeaways

Getting US fulfilment right comes down to a handful of decisions most brands leave too late. Here is what matters most:

•        East Coast vs West Coast determines your inbound transit time from the UK and your average domestic shipping zone — and those two factors together shape your per-order cost.

•        Customs rules changed in 2025 — the de minimis threshold was removed, so all US-bound goods attract duty regardless of value. Landed cost planning must account for this upfront.

•        WMS integrations are non-negotiable. If a 3PL cannot connect cleanly with Shopify, WooCommerce, or Amazon, you will be managing orders manually at scale.

•        DTC and B2B fulfilment have different requirements. Amazon FBA prep, retail-ready pallets, and individual parcel dispatch each need different handling — not all US 3PLs do all three.

•        Returns planning belongs in your unit economics before you launch. Sending returns back to the UK from the US is rarely cost-effective, and a poor returns process damages repurchase intent.

Getting these right from the start saves you from renegotiating contracts or switching providers six months in.

Why UK Brands Are Looking at US Fulfilment Centres

The US eCommerce market is the most straightforward expansion target for most UK brands, and the numbers back that up. Shared language, similar shopping habits, and a consumer base that actively buys cross-border goods make it a logical first step beyond Europe. The question is not whether the market is worth entering — it is how to enter it without your logistics costs eating into the margin.

The Scale of the US eCommerce Market

The US eCommerce market is genuinely large. According to the US Census Bureau, US eCommerce sales in Q4 2025 reached $316.1 billion, up 5.3% year on year, representing 16.6% of all US retail sales. That consistent, compounding growth means the window for UK brands is open — and staying open.

You can check the latest quarterly figures directly from the US Census Bureau eCommerce data. The numbers confirm what many UK founders already suspect: US consumers are buying online at a rate that generates real volume, even for niche brands that would take years to achieve equivalent traction at home.

The gap UK brands feel most acutely is delivery speed. When you are shipping from a UK warehouse, a US customer is looking at six to twelve days on a good week, and that is before customs delays. Domestic US competitors ship within 2 to 4 days. That gap alone is enough to lose the sale on the second purchase, even if the first one converts.

The Strategic Case for Localising Your Fulfilment

Localising your stock in the US changes the economics of US sales entirely. When you warehouse in-market, you absorb duties upfront as part of your landed cost rather than passing unexpected charges to the customer at the point of delivery. Customers who receive a surprise customs charge on an international parcel rarely buy again.

Bezos.ai operates across multiple international markets, including the US. You can see the full list of countries and expansion support on the country expansion page. Having a fulfilment partner who already operates in-country removes the need to negotiate with local warehouses from scratch.

Delivery speed also drives repeat purchase rates in a way that is hard to quantify until you test it. Brands that have moved US stock in-market consistently report higher reorder rates, fewer customer service contacts about delivery status, and measurably better product reviews. Returns friction also drops — local reverse logistics means a customer can return without paying international postage, which removes one of the bigger barriers to a first purchase.

How US Fulfilment Centres Work for eCommerce Brands

Before you can evaluate a 3PL partner, it helps to understand the full cycle your stock will move through once it lands in the US. The process is largely the same as UK fulfilment, but with added complexity around customs on the inbound side and carrier mix on the outbound.

The Core Fulfilment Cycle

Stock arrives at a US fulfilment centre from your manufacturer or from the UK. The warehouse receives it, books it into the WMS, and makes it available for order allocation. From there, orders come in from your sales channels — Shopify, Amazon, WooCommerce — and are routed to the pick team. Pickers pull the items, packers box and label them, and the parcel goes to the carrier at the cut-off time for that day's outbound run.

Real-time inventory visibility underpins the entire process. If your WMS sync is working correctly, every order triggers an inventory deduction, and your stock levels stay accurate across all channels without manual intervention. Returns feed back in the same way — received, inspected, restocked or disposed of, and reconciled in the system.

The table below shows the core stages and the SLA benchmarks worth holding a US 3PL to before you sign.

SLAs are only useful if they are written into your contract with financial consequences for breaches. A 3PL that quotes five-day inbound receiving and then routinely takes ten days is a problem — one that will surface at peak.

DTC vs B2B Fulfilment in the US

DTC fulfilment in the US is straightforward in principle: an order comes in, a parcel goes out. B2B is more involved. If you are selling wholesale to US retailers or prepping stock for Amazon FBA, the requirements are layered. Amazon FBA prep means applying FNSKU labels to every unit, conforming to box content rules, and packing to Amazon's exact specifications — any deviation leads to rejected inbound shipments.

Retail and wholesale add their own layer. US retailers often require EDI compliance, carton-level labelling with specific ASIN barcodes, and pallets built to particular height and weight specs. A 3PL that handles DTC well may not have the experience or the team for B2B compliance. If you plan to run both channels from the same US warehouse, explicitly confirm that the facility has done so before — and ask for reference clients.

East Coast vs West Coast: Where Should You Base Your Stock?

The single most common question UK brands ask when planning US fulfilment is which coast to use. The answer depends on where your customers are, where your stock comes from, and how much you are willing to spend on domestic shipping to quickly reach parts of the country your warehouse does not cover.

Geographic Tradeoffs for UK Brands

For UK brands shipping stock from Britain, the East Coast has a practical advantage: shorter transit time on the inbound leg. A container from Felixstowe to New Jersey typically takes around ten to twelve days at sea. The same container to Los Angeles takes considerably longer, often in the twenty to thirty-day range, since it typically routes via the Panama Canal. If you are air-freighting replenishment stock, the difference narrows, but the cost per kilo goes up sharply.

The population density argument favours the East Coast for most consumer DTC brands. A single New Jersey or Pennsylvania warehouse puts you within two-day ground shipping reach of roughly 60–70% of the US population. That matters more than inbound transit time if your customers are concentrated in the Northeast and Midwest.

Shipping Zones and Delivery Time Reality

US carriers — UPS, FedEx, and USPS — price domestic parcels on a zone system from 1 to 8, where zone 1 is your immediate local area, and zone 8 is the furthest point in the country. The cost difference between zone 1 and zone 8 can be 60–80% higher for the same parcel weight. 

That spread is why your warehouse location directly affects your per-order unit economics.

Ground shipping from the East Coast typically delivers to the West Coast in five to seven business days. Most US consumers accept that timeline for standard orders, but categories like gifts, fashion, and anything with a time-sensitive occasion attached benefit from faster options. If your customer base is genuinely national, a Midwest hub or a two-warehouse split cuts average transit times considerably — at the cost of more complex inventory management and higher fixed overheads.

Customs, Duties, and Cross-Border Compliance

Cross-border compliance is a part of US expansion that most brands underestimate until their first shipment is held at customs. The rules changed in 2025 in ways that directly affect UK brands sending stock into the US, and the changes are not minor.

What Changed for UK Brands in 2025

Before August 2025, goods entering the US with a declared value below $800 — the de minimis threshold — passed through customs duty-free. That threshold was removed. All US-bound goods, regardless of value, are now subject to applicable duties. For UK brands that have built a model around direct-to-consumer international shipping at low per-unit prices, this materially changes their cost structure.

HS code accuracy is now more critical than ever. The duty rate applied to your goods depends on how they are classified, and misclassification leads to either overpayment or, worse, penalties and delays. The International Trade Administration provides a practical starting point: the Import Tariffs, Fees, and Resources page covers tariff lookup tools, the Customs Info Database, and guidance on HS code classification — all directly relevant to UK brands importing stock into the US.

Warehousing stock in a US state also triggers sales tax nexus obligations. Once you have inventory in a state, you may be required to collect and remit sales tax on sales to customers in that state. Most eCommerce brands manage this through their Shopify or WooCommerce tax settings, but you need to confirm which states your 3PL warehouses in before you go live.

Practical Steps Before You Ship Into the US

Getting customs right is a checklist exercise — there is no shortcut, but it is also not as complex as it sounds once you have done it once. The steps below cover the minimum you need to work through before your first inbound shipment.

•        Confirm HS codes for every SKU in your range. If you are unsure, a customs broker can classify them for a flat fee per product.

•        Obtain an Employer Identification Number (EIN) from the IRS, or engage a customs broker to act as your importer of record without one.

•        Identify which US states your 3PL warehouses are in, and register for sales tax where nexus applies. Most eCommerce tax software (TaxJar, Avalara) can automate the calculation.

•        Decide on your Incoterms. DDP (Delivered Duty Paid) means you absorb the duty and the customer sees a clean price. DAP (Delivered At Place) passes the duty to the customer — and in most B2C contexts, that is a conversion killer.

Bonded warehouses and foreign trade zones (FTZs) offer additional options for brands with high volumes or complex supply chains, letting you defer duty payment until stock leaves the facility. They are worth exploring once you have a clear picture of your US SKU mix and volume, though they add administrative overhead for smaller operations.

Technology and Integrations: What to Ask a US 3PL

A US fulfilment centre's technology stack is where the day-to-day reality of working with them either runs smoothly or starts to cost you time. The integration setup is usually a one-time exercise, but if the 3PL's WMS cannot connect cleanly to your sales channels, you will be chasing stock levels and order statuses manually — and that does not scale.

WMS and Platform Connectivity

Shopify, WooCommerce, and Amazon are the three integrations that cover most UK brands entering the US market. A 3PL that handles all three via a direct API connection — not a third-party middleware workaround — is a material differentiator. Real-time inventory sync means your stock levels update the moment an order is picked, preventing overselling and eliminating the need for manual reconciliation.

Bezos.ai's international fulfilment infrastructure is built around real-time inventory management, multi-channel integration, and automated order routing — you can read more on the international fulfilment operations page. For UK brands managing stock across UK and US warehouses simultaneously, having a single seller portal with visibility into both is the difference between manageable complexity and a reporting headache.

Returns portal integration matters too, and it is often the last thing brands check during onboarding. If your 3PL's WMS does not connect to your returns platform, returned stock sits in a grading queue without updating your inventory. That creates phantom stock — units that show as available but are not sellable — and it quietly erodes your margin over time.

Evaluating Technology Before You Sign

Ask for a live portal demo before you commit to a 3PL contract. Screenshots and marketing copy do not tell you whether the interface is usable or whether the data is genuinely real-time. A good WMS demo shows order flow from receipt to dispatch, current stock levels, and what an exception looks like when a mispick or carrier failure occurs.

•        Ask how long the integration setup takes. Under 30 minutes for a Shopify connection is achievable with a well-built API; anything quoted in weeks suggests a custom build or a workaround.

•        Confirm whether the WMS is proprietary or white-label. White-label systems vary in support quality and update cycles.

•        Clarify data ownership. Your inventory records, order history, and customer data should remain yours — confirm this in the contract before you sign.

•        Request downtime history for the past 12 months. Any provider that cannot produce this figure is either not tracking it or not proud of it.

•        Ask about escalation paths when a system error affects live orders. A ticketing queue with a 48-hour SLA is not acceptable during peak.

The technology conversation is also a good proxy for the 3PL's operational maturity. Providers that have invested in their WMS tend to have better pick accuracy, cleaner inbound processes, and more reliable SLA performance across the board.

Returns Management in the US

US return rates in categories like apparel, footwear, and consumer electronics can be higher than UK averages — some estimates put US fashion returns at 20–30% of online orders . For a brand just entering the US market, that is a number to stress-test against your margin model before launch, not after.

Why Reverse Logistics Needs Its Own Plan

Returning goods from US customers to a UK warehouse is rarely economical. The shipping cost alone, combined with the customs re-import duties on the UK side, can exceed the value of the product for anything below roughly £50 retail price . The practical solution for most brands is to process returns locally — inspect, restock sellable units, and dispose of or liquidate unsellable ones.

Returnless refunds are worth considering for low-value items where the cost of return logistics exceeds the product's resale value. A £12 accessory that costs £6 to receive, inspect, and restock may be cheaper to write off and refund directly. That decision belongs in your returns policy before you launch, not as a case-by-case judgment call at volume.

Building Returns Into Your Unit Economics

Factor your expected return rate into your per-unit margin model before you price for the US market. A brand running a 15% return rate with a £6 restocking fee per unit and a 30% unsellable rate on returns will have a materially different margin profile than its UK equivalent — and if that is not accounted for at the pricing stage, the US channel will underperform expectations without any obvious reason.

Bezos.ai's 3PL fulfilment service covers the full logistics cycle, including reverse logistics and returns handling. If you are evaluating providers on this criterion, the 3PL eCommerce fulfilment and outsourcing page sets out the scope of what is included and how the model scales with your volume.

Packaging spec affects how much returned stock is resalable. If your US packaging does not survive a single open-and-close cycle, a higher proportion of returns will end up as write-offs rather than being restocked. That is a product and packaging decision, but it directly affects your reverse logistics economics. Also, returns data is one of the better product signals you have — high return rates on a specific SKU, with consistent reasons cited, tell you something your product team should hear.

Choosing a US Fulfilment Centre: A Buyer's Framework

Picking a US 3PL is not just a logistics decision — it is a commercial relationship that will affect your customer experience, cash flow, and operational overhead for 12 to 24 months. Most UK brands focus on price and location. The criteria that determine whether a partnership works well go beyond that.

The Criteria That Actually Matter

Start with location relative to your customer base, not relative to the port. A warehouse in Newark is useful if your customers are on the East Coast, but it is a poor choice for a brand whose US audience is concentrated in California and Texas. Pull your existing international order data and map your US customers before you shortlist locations.

Pricing transparency is where most 3PL relationships get complicated. A headline pick fee of $1.50 per order sounds competitive until you add the per-item fee, the packaging material surcharge, the inbound receiving fee per SKU, and the monthly minimum storage charge. Ask for a fully loaded cost model based on your actual SKU mix and order profile, not a rate card.

Red Flags When Evaluating Providers

Some warning signs are easy to miss during a sales conversation, but become obvious problems within the first 60 days of operation. The list below covers the ones that consistently cause UK brands the most difficulty when expanding to the US.

•        Pricing with multipliers buried in contract addenda. Ask for a full rate card and a worked example with your numbers before signing.

•        No real-time inventory visibility. If the portal updates every 24 hours, you are flying blind during peak.

•        Single carrier dependency. If UPS has a service disruption, your orders should be able to route through FedEx or USPS. A 3PL with one carrier relationship cannot offer that fallback.

•        No track record with UK or international brands. Customs, HS codes, and inbound shipments from overseas differ from domestic US operations — ask specifically about international clients.

•        Inbound receiving SLAs over five business days. Stock sitting unbooked for a week is stock you cannot sell.

•        Inability to handle both DTC and B2B in one facility. If you plan to run both channels, confirm the capability up front — switching warehouses later is expensive and disruptive.

A good 3PL partner will welcome detailed questions about their operational processes. One that deflects, gives vague answers, or pushes you toward a contract before answering is telling you something important about how they operate day-to-day. The due diligence stage is the best time to find out, and the fulfilment centre USA selection process is worth doing thoroughly.

Conclusion 

Expanding into the US is one of the most straightforward growth moves available to a UK eCommerce brand, and also one of the most operationally demanding if you underestimate the fulfilment side. The brands that make it work sort location, customs, WMS integrations, and returns handling before the first shipment lands — not after the first quarter of live trading goes sideways.

The 2025 customs changes made landed cost planning non-negotiable. The de minimis exemption is gone, HS code accuracy matters more than ever, and sales tax nexus kicks in the moment your stock touches US soil. Get those right upfront.

On the fulfilment side, a 3PL that lacks real-time WMS connectivity, cannot handle your channel mix, or buries fees in contract addendums, will cost you more in operational friction than you save on the headline pick fee. Evaluate on written SLAs, transparent pricing, and a returns workflow that keeps stock in circulation. The US market rewards brands that show up operationally ready — and that starts well before the first order ships.

FAQ

What is a fulfilment centre in the USA?

A US fulfilment centre is a third-party warehouse that stores your stock, picks and packs orders, and ships them to US customers on your behalf. See Bezos.ai's 3PL fulfilment page for more.

How much does US eCommerce fulfilment cost for a UK brand?

Costs vary by provider, volume, and SKU mix. Expect pick fees of $1.50–$5.00 per order, storage from $0.50–$1.00 per cubic foot per month, plus inbound receiving and returns fees on top.

Do I need a US business entity to use a fulfilment center in the United States?

No — a customs broker can act as your importer of record. You will need an EIN for tax purposes in most cases. Bezos.ai can guide you through the setup via the international fulfilment page.

What is the difference between a fulfillment center and a warehouse in the USA?

A warehouse stores goods long-term. A fulfilment centre is operationally active — receiving stock, processing orders daily, managing returns, and connecting to your sales channels in real time.

Can a UK brand use a US fulfilment centre for both Amazon FBA prep and DTC orders?

Yes, if the facility supports both. Confirm FBA prep capability explicitly and ask for reference clients. Bezos.ai's country expansion page covers the US as a supported destination.

What happened to the US de minimis threshold in 2025?

The $800 de minimis exemption was removed on August 29, 2025. All goods entering the US now attract applicable duties regardless of declared value. Factor this into your landed cost model before pricing for the US market.

Is East Coast or West Coast better for a UK brand's first US warehouse?

East Coast suits most UK brands starting out — faster inbound transit from the UK and a large customer population within two-day ground shipping reach.