Multi Warehouse for WooCommerce — stock by warehouse, order allocation and picking lists

Multi Warehouse for WooCommerce is a plugin for a shop whose goods sit in several places: a main warehouse, a warehouse in another city, a shop floor, a reserve. WooCommerce knows one number per product — how many you have in total. The plugin adds the split: how many units are in which warehouse and on which shelf, which warehouse picks each order, and what exactly the picker has to walk to.

The total stays with WooCommerce: product stock = the sum of its warehouses. Reports, feeds, the storefront and other plugins work as before; the plugin only splits that number between warehouses and keeps the sum equal after every change. Selling one item under several product cards (on its own and in a gift box, in two categories)? There is a companion plugin, Shared Stock — the two work together.

What the shopper sees

Under the Add to cart button there is an “Availability by warehouse” block: “in stock”, “only N left” or “out of stock” per warehouse (or exact quantities — a switch in the settings). For a variable product the list switches with the chosen size or colour, including the new “Add to Cart with Options” block of block themes. The block can also go anywhere else with the [catcode_mwh_availability] shortcode; a warehouse you do not want to show is hidden with one checkbox.

The checkout does not change for the shopper: they choose shipping and payment as usual. With Pro there is a “Pickup from warehouse” shipping method: only warehouses holding the whole cart are offered, with address, opening hours and phone; the chosen warehouse is recorded on the order.

What the admin gets

Everything is under WooCommerce → Warehouses. The first tab lists the warehouses: code, address, priority (a lower number goes first), the “Ships online orders” mark (untick it for a shop floor or a reserve) and whether it is shown on the storefront. The main warehouse exists right after activation and holds all your current stock. A deleted warehouse hands its stock to the main one; product totals do not change.

Stock is distributed in the product editor — the Inventory tab gets a table of warehouses with shelves under the quantity field, and every variation has its own — or for all products at once on the “Stock by warehouse” tab. A change is saved as a difference against what the page showed when you opened it, so an order placed while you edit keeps its units. Moving units between warehouses (−2 here, +2 there) does not change the total.

Every order gets a “Warehouses” box: which warehouse and shelf each line ships from, shortages (if sold on backorder), moving a line to another warehouse. The orders list gets a “Warehouse” column. A cancellation, a refund with restock, a quantity change or a line deleted by a manager puts the units back into the warehouse they were taken from.

Picking

The “Orders to pick” tab shows orders by status and warehouse and how many units of each are already picked. From there, or from the order itself, you print a picking list: one per warehouse, lines sorted by shelf (A-2 before A-10), with SKU and GTIN — the picker walks the warehouse in order instead of searching for goods.

In Pro you tick several orders and get a batch list: the total per product for one walk through the warehouse, followed by one page per order for packing. Picking can use a scanner: a phone camera (over HTTPS), a USB or Bluetooth scanner, matching SKU, GTIN / EAN / UPC or your own barcode field; after “Finish picking” the order gets a note and the status set in the settings. An order from two warehouses can ship in parts: each part is marked shipped with its tracking number, the customer gets a note, and after the last part the order becomes Completed.

Together with Shared Stock

If one physical item is sold under several product cards, their common stock is kept by Shared Stock for WooCommerce, and Multi Warehouse splits each card’s stock between warehouses. We tested them together: 42 compatibility checks per run (HPOS on and off, PHP 7.4 and 8.3) and simultaneous checkouts by eight shoppers — warehouses, cards and pool matched after every round.

One limitation to know: Multi Warehouse does not know that the cards of a pool are one item, so each card has its own warehouse split. Keep the warehouse split on one card of the pool; the other cards effectively hold their stock in the main warehouse — when one card sells, the others lose the units from the main warehouse, then from the other warehouses by priority, never below zero. Pickup for the other cards offers warehouses by their own split.

How it works — step by step

1. You create warehouses and distribute stock. Each product’s WooCommerce stock becomes the sum of its warehouses.
2. A shopper places an order. When WooCommerce reduces stock (payment, Processing, On hold), the plugin takes each line from the warehouses that ship online orders, by priority; if one cannot cover it, the line is split.
3. The allocation is saved on the order: warehouse, shelf, quantity — visible in the “Warehouses” box, on the picking list and in the orders list.
4. A manager picks the order with the picking list (in Pro, also with a scanner) and moves a line to another warehouse if needed.
5. A cancellation, a refund with restock or an edited line puts the units back into the warehouse they came from.
6. Stock changes from outside — imports, accounting software, the REST API, quick edit — are distributed by the plugin: an increase to the main warehouse, a decrease from the main warehouse while it has units, then from the other warehouses by priority.

How much it costs

Pro is 990 UAH for a one-year licence. A year of updates, technical support and all Pro features. You can take a longer term right away — the longer, the cheaper per year:

• 1 year — 990 UAH
• 2 years — 1,880 UAH (−5%, 940 UAH per year)
• 3 years — 2,610 UAH (−12%, 870 UAH per year)
• 4 years — 3,250 UAH (−18%, 810 UAH per year)
• 5 years — 3,710 UAH (−25%, 740 UAH per year)

No automatic charges: renewal is manual, reminders come by e-mail. A purchased licence keeps the Pro features forever — when the term ends, the shop only stops getting new versions and support. One key — one domain; moving the shop — unbind the licence on the old site and activate the key on the new one.

Trial first, then payment. The 7-day Pro trial starts with the “Try Pro for 7 days” button, the key arrives by e-mail, no card needed. After the trial only the Pro features switch off; warehouses and stock keep working.

What was tested and what was not

The plugin was tested end to end on a local stack: nginx + PHP-FPM, PHP 8.3 and 7.4, MariaDB 10.11, HPOS on and off, the Twenty Twenty-Five block theme and the classic Storefront — 105 checks per run plus a simultaneous-orders test. Not tested: MySQL 8, Redis as an object cache, catalogues of 10,000+ products. We did not open the scanner page with a phone camera in a browser — the server side was tested (every scan is counted on the server, you cannot pick more than the order holds). The live licence server and the trial were not part of the test.

Under the hood

• Bookkeeping. Three own tables: warehouses, quantities per warehouse, order allocations. Every quantity change is one relative SQL statement, and the last units are taken conditionally, so two orders cannot take the same unit. In the test, 10 simultaneous orders of 2 units against 20 units in three warehouses brought the warehouses exactly to zero.
• Sum = WooCommerce stock. At the end of every request the plugin compares the warehouse total with WooCommerce stock and distributes any difference that came from outside.
• One order — one reduction. A payment callback and the shopper returning to the site can arrive at the same time; without protection, WooCommerce 11.1 reduced one order several times in our test. The plugin lets one order be reduced by one request at a time (MySQL GET_LOCK) — exactly once.
• Allocation follows the facts. Returns are always counted from the quantity WooCommerce actually reduced for the line (_reduced_stock).
• Uninstalling with “Delete warehouse data with the plugin” ticked removes the tables, settings, the plugin’s marks on orders and its shipping method in zones; WooCommerce stock is not changed.

How to install

1. Download the free version catcode-multi-warehouse-for-woocommerce-free-1.0.0.zip with the button at the top of the page (or the Pro archive from your account after payment): Plugins → Add New → Upload Plugin → Install → Activate.
2. Make sure stock management is on in WooCommerce → Settings → Products → Inventory.
3. WooCommerce → Warehouses: the main warehouse is already created with all your stock. Add the other warehouses, addresses and priorities.
4. Distribute the stock: in the product editor (Inventory tab and each variation) or in the table on the “Stock by warehouse” tab.
5. For Pro: paste the licence key from the e-mail after payment, or click “Try Pro for 7 days” in the “Pro licence” section.