How to switch 3PL without slowing sales: an 8-step migration plan (2026)

Short answer: to switch 3PL without slowing sales, prepare your exit before notifying your current provider, avoid peak periods (Black Friday, Christmas and your own campaigns) and migrate in phases: tested integration, a clean item master, stock transfer counted at both ends, test orders and a few days running in parallel. With a documented catalogue and native integrations, the switch takes weeks, not months.

Transparency: this article is published by Bolian. Third-party information comes from their official websites and is linked under «Sources».

When is it time to switch 3PL?

It is worth telling a bad month apart from an underlying problem. If these signs keep recurring, they usually point to the latter:

• Recurring picking errors: wrong products or incomplete orders every week.
• Stock that doesn’t add up: the shop sells what the warehouse doesn’t have, or the other way round.
• Peaks that overflow: every campaign ends with delays of several days.
• Fragile integration: orders that don’t come through, tracking that doesn’t update or manual file uploads.
• Slow returns and lack of visibility: you have to ask by email for data you should be able to see on a dashboard.
• Your business model has changed and your provider hasn’t: you now sell on marketplaces, to distributors or outside Spain.

Before deciding, put it in writing: what is going wrong, since when and with what data. It will help you negotiate with your current provider and, if nothing changes, explain to the new one what must not happen again.

When is the best time to change logistics provider?

The best time is the quietest period of your year, with enough margin before the next peak. For most e-commerce businesses that means not touching anything between late October and mid-January: Black Friday, Cyber Monday, Christmas, Epiphany (6 January) and the returns peak that follows. If the decision comes in autumn, prepare now (selection, contract, integration) and do the physical move after Epiphany.

Add your own peaks (Mother’s Day in cosmetics, back-to-school in publishing, an announced launch) and work the timeline backwards:

• The notice period required by your current contract.
• The go-live lead time of the new provider. Bolian, for example, states on its website that migrating from another 3PL takes 2 to 4 weeks depending on volume and catalogue.
• A safety margin of one or two weeks for the unexpected.

Forcing the switch to coincide with a campaign usually costs you in the first days of operation. We explain this in the guide on when to outsource fulfilment and what to demand from your provider.

What should you check in your contract and data before telling your current 3PL?

Read your current contract before announcing anything. These are the points that cause the most problems when leaving:

• Notice and term. The period, the required form of notice (in writing, to whom) and whether there is automatic renewal or a minimum commitment.
• Exit clause and access to stock. How and within what time your goods are handed over (pallets, paperwork, collection hours) and on what terms you can recover them if there is an open dispute. Resolve any disputes before setting the date: it is the typical reason stock doesn’t leave when it should.
• Data ownership and export. Orders, item master, stock by location, batch and expiry date, returns and incidents are yours. Ask for an export format (file or API) and the full history.
• Personal data. Your 3PL processes your customers’ data as a data processor: when the contract ends, the GDPR (art. 28) requires it to return or delete the data, as you choose.
• Carrier accounts and your own materials. If the carrier accounts are in the provider’s name, you won’t be able to use them when you leave. And custom boxes, inserts and labels must be included in the outgoing inventory.

Also take a snapshot of your operation: orders per month, lines per order, SKUs, channels, destinations, returns and peak weeks. It is the basis for comparing proposals and sizing the move.

How do you switch 3PL in 8 steps without slowing sales?

As well as the usual steps, this plan covers what fails most often in practice: counting at both ends and running in parallel.

Step 1. Choose your new 3PL using your real data

Send each candidate the snapshot of your operation and ask for a proposal based on it, not a generic presentation. Visit the warehouse, ask for clients with a profile similar to yours, check which integrations are native and ask how they approach the migration: who leads it and in what phases.

Step 2. Sign a contract that includes the transition plan

Fix what was missing from the previous contract. As well as the SLAs (accuracy, cut-off time, goods-in and returns), include the target go-live date, the migration milestones and a reasonable exit clause.

Step 3. Start onboarding with a timeline and a named owner

Appoint an owner on each side and set a weekly meeting. Document the processes the new provider must replicate: goods-in, stock rules (FIFO, or FEFO if there are expiry dates), returns criteria, packing and B2B paperwork. Without that documentation, onboarding drags on.

Step 4. Integrate your shop, ERP, marketplaces and carriers

Connect every channel in test mode before moving a single box: shipping methods, order statuses, customer tracking and stock sync. If you use an ERP, confirm which system is the master for stock. At Bolian, the native connection with Shopify, WooCommerce and other e-commerce platforms syncs orders, stock and statuses, and the API covers ERPs and in-house systems.

Step 5. Clean up and load your item master

It is what the warehouse will use to receive, pick and label. Check every SKU:

• SKU and barcode (EAN) matching the physical label.
• Actual dimensions and weight: they determine the box, carrier and label.
• Batch, expiry date or serial number control where applicable.
• Units per carton and per pallet for goods-in.
• Fragile products or products with transport restrictions (aerosols, alcohol-based perfumes, batteries).

Ask them to validate a physical sample from each product family: item master errors cause the most incidents at the start.

Step 6. Move stock in waves and count at both ends

Agree collection dates, content lists for each pallet and advance notice to the new warehouse. Count when closing at origin and when receiving at destination, and reconcile differences by SKU and batch before publishing that stock in the shop.

Move the slowest-moving SKUs first and leave the best-sellers for the last wave, with safety stock at origin: that way your star products are never all on one lorry. More ideas in our guide on how to avoid stockouts in e-commerce.

Step 7. Run test orders across every scenario

Before opening the floodgates, test end to end with real or internal orders:

• Single-line order and multi-line or multi-parcel order.
• Shipping to the Spanish mainland, the Balearic Islands, the Canary Islands and, if you sell abroad, another EU country.
• An order from each marketplace and a B2B order to a distributor or shop.
• Cancellation, change of address and a full return through to restocking.

Check that every order comes in, leaves with the right carrier, generates tracking and updates stock across all channels.

Step 8. Run both warehouses in parallel and set a cut-over date

For a few days both warehouses run side by side: the new one serves the SKUs already moved (or one channel) and the old one the rest, with routing rules so that each order has a single owner. Once the last wave has been counted, set the cut-over date, change the returns address and agree with the old provider how it will forward any returns still arriving. Afterwards, review incidents daily until the metrics stabilise.

What are the migration risks and how do you mitigate them?

Which KPIs should you track in the first few weeks?

Agree them before go-live and review them daily at first, then weekly:

• Order accuracy: orders shipped without product or quantity errors. As a benchmark, Grupo Akoma, which Bolian belongs to, publishes 99.9% accuracy.
• Orders shipped on time against the cut-off time.
• Inventory accuracy and goods-in time until goods are available for sale.
• Sync issues: blocked orders, tracking not sent or stock not updated.
• Late deliveries and transport incidents by carrier and region.
• Returns processing time: days until the unit is sellable again. More ideas in our guide on how to manage returns without them eating into your margin.
• «Where is my order?» queries: they are usually the first warning that something is wrong.

What does each provider offer for the switch?

A summary of what each provider publishes on its website about brands coming from another 3PL, without ratings:

In Bolian’s case, its Promofarma case study describes a go-live in 2 weeks with 10,000 SKUs and more than 10 carriers integrated. Bolian’s own warehouse is in the Vallès area (Barcelona), within a group with four operating centres; you can see the details on the page on Grupo Akoma’s centres and certifications and the one on fulfilment from Barcelona for the whole of Spain.

What should you ask for before signing with a new 3PL?

1. A written migration plan, with phases, dates, owners and what they need from you at each stage.
2. The list of native integrations you will use and a demonstration with your shop or ERP.
3. The written SLAs: accuracy, cut-off time, goods-in and returns processing times.
4. The goods-in and counting procedure for the stock arriving from your current provider.
5. The set of test orders they will run before go-live, including returns.
6. How the parallel go-live will work and who decides the cut-over date.
7. The KPIs you will see on the dashboard from day one and how often they are reviewed.
8. A reasonable exit clause: handover of stock and export of your data if you ever decide to leave.
9. References from clients who have migrated from another 3PL.
10. A visit to the warehouse where your product will be kept.

If you want to see how your own switch would work, at Bolian we review your current operation and propose a phased plan in a personalised demo with your order and catalogue data. We work with brands from around 500 orders a month, and you can see beforehand how our order, stock and shipping management software for e-commerce works.

Frequently asked questions

How long does it take to switch 3PL?

It depends on the catalogue, the integrations and how quickly the stock arrives. With native integrations and a documented item master it usually takes a few weeks; Bolian, for example, states 2 to 4 weeks depending on volume and catalogue. Add the notice period in your current contract.

Can you switch 3PL without stopping sales?

Yes, if the move is done in waves with a few days running in parallel. The origin warehouse keeps shipping in the meantime, and the shop only publishes the new stock once it has been counted and put away.

When is it best not to change logistics provider?

Before and during your sales peak: for most e-commerce businesses, from late October to mid-January. Also avoid a launch or one of your own campaigns.

Who owns the order and inventory data?

The brand. The provider processes them on your behalf and, when the contract ends, must return or delete them as you choose. Even so, ask for the full export before announcing that you are leaving.

Do you have to move all your stock at once?

It is not advisable. Moving in waves, with safety stock of your best-sellers kept at origin, reduces the risk of running out of product if a lorry is delayed or the count doesn’t add up.

What happens to returns that arrive at the old warehouse?

They will keep arriving for a while. Change the returns address on cut-over day and agree with the outgoing provider how it will forward any it receives.

What volume do I need to work with Bolian?

Bolian works with brands from around 500 orders a month, with 24-48 hour shipping on the Spanish mainland and service to the Balearic Islands, the Canary Islands, Ceuta, Melilla and the rest of Europe.

Keep reading

• When to outsource your online shop’s fulfilment and what to demand from your provider
• Best fulfilment companies in Spain (2026)
• OMS e-commerce system: multichannel order management guide

Sources

• Bolian · Book your demo (migration, integrations and FAQs)
• Bolian · Fulfilment software for e-commerce
• Bolian · Integrations with e-commerce platforms
• Bolian · 3PL fulfilment in Spain
• Bolian · About us (centres and certifications)
• Bolian · When to outsource fulfilment and what to demand from your provider
• Bolian · Promofarma case study
• byrd · Switching 3PL in 8 steps
• Bigblue · Onboarding: timeframes and first shipments
• Amphora Logistics · E-commerce fulfilment service

Information taken from each company’s public website as of November 2026. Each provider’s terms may change: always confirm them directly before deciding.