Warehouse Layout Optimisation for Faster Order Fulfilment

Before you invest in new warehouse technology, racking, or additional space, ask this question: is your current layout working for you or against you? Most SME warehouses evolve organically — products get placed wherever there is room, and the layout that worked when you had 200 SKUs becomes a maze at 2,000. A systematic layout optimisation can reduce picking travel time by 20 to 35 percent, improve throughput, and delay the need for a costly move to a larger facility.

What Makes a Warehouse Layout Inefficient?

Common problems include:

• Fast movers far from packing — your bestselling products should be closest to the packing and dispatch area, but in organic layouts they often end up at the back because that is where space was available when they were added.
• Aisle congestion — two-way traffic in narrow aisles creates bottlenecks, especially during peak periods. Pickers waiting for each other is pure waste.
• Receiving and dispatch in the same zone — when incoming goods and outgoing orders share space, the chaos of receiving interferes with the speed of dispatch.
• No pick-face logic — items stored at floor level that should be at waist height (ergonomic pick zone), heavy items above light items, or related products scattered across different aisles.

How Do You Optimise Your Warehouse Layout?

Follow this four-step process:

1. Analyse your order data — identify your A-B-C products by pick frequency. A items (top 20 percent by picks) get prime real estate. C items (bottom 50 percent) go to less accessible locations.
2. Design your zones — separate receiving, storage, picking, packing, and dispatch into distinct zones with one-directional flow where possible. Goods should move through the warehouse without backtracking.
3. Slot your products — place A items in the golden zone (waist to shoulder height, closest to packing). Group items frequently ordered together in adjacent locations. Place heavy items at low levels for safety and ergonomics.
4. Implement one-way aisles — where space permits, convert to one-way traffic flow. This eliminates congestion, reduces accidents, and enables a serpentine pick path that covers the warehouse in a single pass.

When Should You Reslot?

Product velocity changes over time — seasonal shifts, new products, discontinued lines. Schedule a reslotting review every six months using updated order data. The review does not require a full warehouse reorganisation; typically, 10 to 15 percent of SKUs need to be relocated to maintain optimal placement.

Frequently Asked Questions

Can I optimise the layout without shutting down operations?

Yes. Plan the reorganisation in stages, moving one zone at a time during off-peak hours or weekends. Update your inventory system as items move to their new locations. Most SME warehouses can be fully reorganised over two to three weekends.

How much space should I allocate to receiving and dispatch?

A general rule is 10 to 15 percent of total warehouse space for receiving and 10 to 15 percent for dispatch, with staging areas for inbound quality checks and outbound order consolidation. Undersizing these areas creates bottlenecks during peak periods.

Do I need warehouse management software to optimise layout?

Not for the initial optimisation. A spreadsheet with your order data and a floor plan is sufficient to identify fast movers, design zones, and plan slotting. WMS becomes valuable for maintaining the optimised layout over time — directing pickers to the right locations and flagging when reslotting is needed.