How to Switch Fulfilment Provider Without Disrupting Orders: A UK Migration Plan

29/10/2026 | Share:

Most brands do not switch fulfilment provider on a whim. They switch after a run of late dispatches, a peak season that went wrong, a price rise that did not come with better service, or the realisation that they have simply outgrown their 3PL.

The decision is usually the easy part. The hard part is the move itself. Your stock has to be counted out of one warehouse and into another, your sales channels and couriers reconnected, and customer orders kept flowing throughout. Done badly, a switch causes exactly the problems you were trying to escape. Done well, customers never notice.

This guide sets out a practical, UK-focused plan for switching 3PL: what to check in your contract, the data to get from your current provider, a week-by-week timeline, how to move and reconcile stock, and what to measure once you are live. It is written by Ogden Fulfilment, a family-run fulfilment company in West Yorkshire that dispatches around 850,000 orders a year for more than 140 brands, many of which joined us from another provider.

Signs it is time to switch, and when to fix things instead

Not every problem needs a new provider. Before you serve notice, be clear about what is going wrong and whether your current 3PL can fix it.

Common reasons brands switch include:

• Repeated pick and pack errors, such as wrong items, missing items or damaged parcels.
• Missed dispatch cut-offs and late deliveries, especially at weekends or peak.
• Stock figures that do not match what is on the shelf.
• Slow or unhelpful account management, with problems raised but never resolved.
• Invoices that keep growing through surcharges and fees that were not clear at the start.
• A provider that cannot support a new channel, product type or volume you need.

If the problem is a single issue, such as one integration fault or one poor peak, it is worth raising formally first and giving your provider a fixed period to put it right. If the problems are repeated, spread across several areas, or your provider cannot support where your business is going, a switch is usually the right call. Our guide to choosing a UK fulfilment company explains what to look for in your next provider.

Before you serve notice: check your contract

Your existing contract decides how quickly you can leave and what it will cost. Read it before you tell your current provider anything.

Notice periods, minimum terms and exit charges

Look for:

• The notice period, and whether it must be given in writing to a named contact.
• Any minimum term, and whether you are still inside it.
• Exit or termination charges, and charges for removing stock from the warehouse.
• Charges for preparing stock for collection, such as palletising, wrapping and labelling.
• How long your provider will keep fulfilling orders during the notice period, and at what rates.

Put the dates in your plan. If you have a three-month notice period, that sets the earliest date your stock can realistically move.

Who controls your stock if invoices are disputed

Check whether the contract gives your provider the right to hold your stock until all outstanding invoices are paid. If there are invoices in dispute, settle or agree them before serving notice, so that your stock is released on the day you need it. Your stock is your working capital; you do not want it held up by a billing argument.

The data you need from your current provider

A smooth move depends on accurate data. Request these from your current provider early, ideally before you serve notice, and check them carefully:

• A full SKU list with product names, barcodes and any internal references.
• Product dimensions and weights for every SKU.
• Stock on hand by SKU, including quantities in reserve and in pick locations.
• Batch numbers, lot numbers and best-before or expiry dates, where relevant.
• Any stock that is damaged, quarantined or awaiting return to supplier.
• Packaging specifications, inserts and any kitting or bundle rules.
• Courier services used for each product or order type.
• Open orders, back orders and returns in progress.

Compare the stock report against your own sales and purchasing records. If there are large differences, ask for a stock count before the move rather than discovering the gap after it.

A week-by-week migration timeline

Every move is different, but a straightforward switch for a direct-to-consumer brand usually follows the stages below. Allow more time if you have many SKUs, several sales channels, batch-controlled stock or complex packaging.

Weeks one and two: agree terms with your new provider, confirm your go-live date and serve notice on your current provider. Share your SKU data and product specifications with the new team.

Weeks two to four: set up your products on the new provider’s system, connect your sales channels in a test mode, and agree courier services and packaging. Order any branded packaging and inserts so they are on site before go-live.

Weeks three to five: book the stock transfer. Agree collection dates, pallet labelling and delivery slots at the new warehouse. If possible, send a small first delivery of fast-selling lines so the new provider can test receiving, picking and packing on real stock.

Weeks four to six: move the remaining stock, complete the count-in and reconcile figures. Switch your sales channels so new orders flow to the new provider, and monitor every order closely for the first fortnight.

Phased transfer or single cut-over

There are two ways to move stock.

A phased transfer moves stock in stages. The new provider starts fulfilling orders for the lines it holds while the old provider continues with the rest. This reduces the risk of stock-outs, but it means running two warehouses at once, splitting orders between them and paying both for a period.

A single cut-over moves all stock at once. Orders are paused or slowed for a short window while stock is in transit, then everything restarts at the new site. This is simpler and cheaper, and works well for brands with modest SKU counts and stock that can be moved in a single collection, but it needs careful planning to keep the pause as short as possible.

For many brands, a hybrid works best: move slow-selling and reserve stock first, then move fast sellers in a single cut-over at a quiet point in the week.

Timing: why January to March beats October to December

Avoid switching during peak. From October to December, warehouses are at full stretch, couriers are busy and any mistake costs more because order volumes are highest. A move in this period puts your most important trading weeks at risk.

The best window for most brands is January to March. Peak is over, problems from the previous season are fresh in your mind, and stock levels are usually at their lowest, which means less to move. Starting conversations in November or December lets you serve notice and plan the move so you are fully live before spring trading builds. Our peak season fulfilment guide explains why planning ahead matters so much in the final quarter.

Moving the stock

The physical move is where most problems start, so treat it as a project of its own.

Counting out, transport and counting in

Ask your outgoing provider for a final stock report on the day stock is collected, and keep a copy. Make sure every pallet is labelled with its contents and SKU list, and that mixed pallets are clearly marked.

Choose a transport option that suits the volume. A pallet network or dedicated vehicle is usually right for multiple pallets. Agree a delivery slot with the new warehouse so your stock can be unloaded and counted promptly.

On arrival, your new provider should count every SKU into stock, check for damage and report any differences against the outgoing stock report.

Reconciling differences

Small differences between the count-out and count-in are common. Large ones need explaining before you go live. Work through each difference SKU by SKU, check for mislabelled pallets or stock left behind, and raise any genuine losses with the outgoing provider promptly while the evidence is fresh.

Only switch your sales channels to the new provider’s stock figures once you are confident they are right. Accurate opening stock is the foundation of everything that follows. Our guide to inventory management for eCommerce covers how to keep figures accurate once you are live.

Reconnecting your sales channels and couriers

Shopify, Amazon and marketplace integrations

Your new provider needs to receive orders from every channel you sell on and send stock levels and tracking numbers back. Plan the switch so there is no point at which both providers, or neither, are receiving orders.

A typical approach is to connect each channel to the new provider in test mode first, confirm that orders, stock and tracking all flow correctly, then switch order routing to the new provider at a set time. Check that any automated stock updates from the old provider are switched off at the same moment, so your listings do not show the wrong figures. Our Shopify fulfilment guide covers how store integrations work in more detail.

Courier accounts and tracking

Decide whether you will use your new provider’s courier rates or bring your own courier contracts. Make sure services match what your customers have been promised at checkout, including next-day and weekend delivery options, and that tracking emails and links still work for customers after the switch.

Telling your customers, and when not to

If the move is well planned, most customers will never know it happened. You do not usually need to announce it.

You should communicate if delivery times will change, if orders will be paused for a short time during a cut-over, or if your returns address is changing. Update the returns address on your website, packing slips and marketplace listings on the day you go live, and ask your old provider to forward any returns that arrive after you leave.

Go-live checklist

Before you route live orders to your new provider, confirm that:

• Every SKU is set up with the correct barcode, dimensions and weight.
• Opening stock figures have been reconciled and agreed.
• Every sales channel has been tested for orders, stock sync and tracking.
• The old provider’s stock feeds to your channels have been switched off.
• Courier services match your checkout delivery options.
• Packaging, inserts and any branded materials are on site.
• Your returns address has been updated everywhere it appears.
• You have named contacts at the new provider for the first weeks.

The first 90 days: what to measure

Agree with your new provider how performance will be reported, then watch it closely. The most useful measures are:

• Dispatch on time: the share of orders dispatched within the agreed cut-off.
• Order accuracy: the share of orders sent with the right items and quantities.
• Stock accuracy: how closely system stock matches physical stock at each count.
• Receiving time: how quickly new deliveries are booked in and available to sell.
• Returns processing time: how quickly returns are checked and restocked or refunded.
• Response time: how quickly queries and problems are answered and resolved.

Review these weekly for the first month and monthly after that. Problems in the first few weeks are normal; what matters is how quickly they are fixed. You can see how we report on stock, returns and dispatch on our stock control, returns and reporting page.

How switching to Ogden Fulfilment works

Many of the brands we work with came to us from another provider, so we know where moves tend to go wrong. When you switch to Ogden Fulfilment:

• We work with you on a go-live plan built around your notice period and trading calendar.
• Our team handles the integration set-up and testing for your sales channels. Most standard eCommerce integrations are live within 24 to 72 hours.
• Your stock is counted in and checked against your outgoing stock report, with any differences reported to you before go-live.
• Orders received before 1pm on weekdays are dispatched the same day, and we operate seven days a week, with an 11:30am cut-off on Saturdays and Sundays.
• We have no long-term contracts and no minimum order volumes, and our pricing is itemised so you can see exactly what you pay for.

You can find out more about our 3PL services and how we support growing brands.

Frequently asked questions

How long does it take to switch 3PL provider?

A straightforward switch usually takes four to six weeks from agreeing terms to going live, but your notice period with your current provider often sets the real timetable. Brands with many SKUs, several channels or batch-controlled stock should allow longer.

Can I switch fulfilment provider during peak season?

It is possible but rarely wise. October to December is the riskiest time to move stock and reconnect channels. Most brands are better off planning the switch for January to March.

Will my stock levels be accurate after the move?

They will be if stock is counted out and counted in carefully and any differences are reconciled before you go live. Switch your sales channels to the new stock figures only once they have been agreed.

Do I need new barcodes when I change 3PL?

Usually not. If your products already carry valid barcodes, your new provider can use them. You may need new labels if your current provider used its own internal labels on your stock.

What should I check in my current contract before switching?

Check the notice period, any minimum term, exit and stock removal charges, how orders will be handled during notice, and whether your provider can hold stock if invoices are outstanding.

Planning a move after peak?

If your current provider is not delivering, now is the time to plan a switch for the new year. Speak to the Ogden team about your notice period and stock, and we will help you build a migration plan that keeps your orders flowing. Call 0330 058 5621 for a no-obligation conversation.