This guide is for ecommerce brands and importers whose 3PL is starting to hold them back. You will get the warning signs worth acting on, a week-by-week move plan, a cutover checklist and the questions that keep orders shipping while your stock changes buildings.

Switching 3PLs is a big job, but it is not a mystery. Most moves that go badly fail for the same few reasons: counts nobody checked, a store connection switched too early, or a contract notice period someone forgot. Plan for those, and the move becomes a project with a start and an end date.

Signs it’s time to switch

Every 3PL has a bad week. One late truck or one mis-pick is not a reason to move. Patterns are. Look at the last three to six months, not the last three days.

• Mis-picks keep coming back. Wrong items, wrong quantities or missing inserts show up in customer emails month after month, and the fixes don’t stick.
• Orders miss the cutoff. Orders placed before the agreed cutoff time still ship the next day, or later, with no clear reason.
• Receiving drags. Inbound shipments sit on the dock for days before they are counted and available to sell. You see “out of stock” on your store while the product is in the building.
• Inventory doesn’t match. The 3PL’s counts and your system’s counts drift apart, and cycle counts keep turning up surprises.
• Invoices are hard to read. New line items appear, fees change without notice, or you can’t tie the bill back to the work done. Our guide to questions to ask an ecommerce 3PL covers what a clear quote should include.
• Support goes quiet. Tickets take days, answers are vague, or there is no named person who owns your account.
• You’ve outgrown them. You now need retail or B2B orders, kitting, pallet storage or returns handling, and your 3PL doesn’t offer it or does it poorly.
• The location no longer fits. Most of your inbound now lands at West Coast ports, or most of your customers are in the West, and your stock is far from both.

Try to fix it first

Before you start a move, put the problems in writing to your current 3PL. List each issue, the orders affected and what you need to change. Give a clear deadline. Sometimes this fixes it. If it doesn’t, you now have a record of the problem and a cleaner reason to give notice.

Before you give notice

Read your current contract first. Do this before you tell anyone you are leaving.

Clear up any disputed invoices early. A billing argument in the last week can hold up your inventory at the worst possible time.

A move plan, week by week

Timing depends on how many SKUs you have, how much stock, and how many sales channels connect to your 3PL. A small catalog on one store can move faster. A brand with retail orders and several marketplaces needs more room. Use this as a starting outline and ask your new 3PL for a written timeline with named steps.

1. Weeks 1–2: Pick the new 3PL and pick a date. Choose a move window outside your busiest season and away from big promotions. Most ecommerce brands avoid moving between November and the end of the year.
2. Weeks 2–3: Set up the new account. Load your product catalog with SKUs, barcodes, dimensions, weights and case packs. Add lot and expiration rules for dry food and beverage items. Connect your store and marketplaces in test mode only.
3. Weeks 3–4: Count at the old 3PL. Ask for a full count, or at least a count of your top SKUs, before anything ships out. Problems are much easier to settle while the stock is still in the old building.
4. Week 4: Send a first wave. Move enough of your fast sellers to the new 3PL to cover a few weeks of orders. The old 3PL keeps shipping everything else.
5. Week 5: Receive, count and compare. The new 3PL counts the first wave and you compare it line by line against what the old 3PL said it shipped.
6. Week 5–6: Switch orders over. Turn on order routing to the new 3PL for the SKUs it has. Watch the first few days of orders closely.
7. Week 6–7: Move the rest. Send the remaining stock, including slow movers, packaging and inserts. Receive, count and compare again.
8. Final week: Close out. Get a final “zero inventory” report from the old 3PL, settle the last invoice and turn off the old connections.

How to avoid downtime

Downtime usually happens when no building can ship an item: it has left the old 3PL but isn’t yet counted and ready at the new one. Three habits prevent most of it.

Overlap, don’t hand off

Run both 3PLs at the same time for a short window. The old one ships from what it still holds. The new one ships what it has received. You pay for two buildings for a few weeks, which costs far less than a week of no orders.

Move in waves

Don’t send everything on one day. Move fast sellers first, so the new 3PL proves it can receive and ship them, then move the rest. If something goes wrong in wave one, most of your catalog is still shipping.

Switch orders by SKU, not all at once

Route an item’s orders to the new 3PL only after its stock is received and available there. Many order systems can split routing by SKU or by warehouse. Ask both 3PLs how they handle it, and test it before the first wave ships.

Cutover checklist

• Signed count from the old 3PL by SKU, lot and expiration date, before goods leave.
• Clear outbound paperwork: a packing list and bill of lading for every truck, with pallet and carton counts.
• Advance notice to the new 3PL (often called an ASN) for each load, so receiving can plan the dock.
• Labels that scan. Check that product and carton barcodes match the catalog loaded at the new 3PL.
• Packaging and inserts moved too: boxes, mailers, thank-you cards, promo items.
• Open orders and backorders listed, with a plan for which 3PL ships each one.
• Returns address updated on your store, return labels and marketplace settings, with a date the old address stops.
• Retail and B2B partners told of the new ship-from location if you ship to stores or wholesalers.
• Customer-service team briefed on what might be delayed and what to say.
• Old connections switched off after the final order ships, so no new orders route to an empty building.

What to ask your new 3PL about onboarding

• Who is my contact during the move, and how do I reach them?
• How long does receiving take once a truck arrives, and what slows it down?
• How will you report counts against my packing list, and how fast?
• Can you ship some SKUs while others are still at my old 3PL?
• What do you need from me before the first load leaves?
• What will the first month cost, including receiving the transfer stock?

Where Concord Wholesale fits

Concord Wholesale runs ecommerce fulfillment for dry and ambient products from our Vernon, CA warehouse, about 20 miles from the Ports of Los Angeles and Long Beach. Brands moving stock in waves can also use our pallet storage and warehousing to hold the rest of their inventory while orders switch over. If West Coast inventory placement is part of the reason you are moving, our Los Angeles 3PL page explains how it works, and you can see the industries we serve.

Frequently asked questions

How long does it take to switch 3PLs?

It depends on your SKU count, stock volume and sales channels. A simple catalog on one store can move in a few weeks. Brands with many channels or retail orders often need longer. Ask the new 3PL for a written timeline, and allow for your old contract’s notice period.

Should I tell my current 3PL I’m leaving before I sign with a new one?

Usually not. Read your contract, pick your new partner and set a date first. Then give notice in writing, the way your contract asks for it.

What happens to orders during the move?

With an overlap plan, orders keep shipping. The old 3PL ships what it still holds, and the new 3PL ships SKUs as soon as they are received and counted.

When is the worst time to switch 3PLs?

Right before or during your peak season or a big promotion. Receiving docks are busy, and any delay hits your biggest sales weeks.