Warehouse Lease vs 3PL: When Does It Make Financial Sense to Go In-House?
- The £120,000 Warehouse Lease That Was Losing Money
- The Full Cost Model for Your Own Warehouse
- What 3PLs Actually Charge and What's Negotiable
- Volume, Consistency, and Growth: The Three Deciding Factors
- The SKU Count Complexity Factor
- The Hybrid Approach: Keeping Core Products In-House
- Running the Numbers Before You Sign the Lease
- Make the Decision With Complete Data
The decision to lease warehouse space vs use a 3PL fulfilment centre depends heavily on your monthly order volume, SKU count, and growth trajectory. Below 1,000 orders/month, 3PL usually wins on total cost. Above 3,000-5,000 orders/month with stable volume, your own warehouse often becomes cheaper. AskBiz models this break-even on your actual data.
- The £120,000 Warehouse Lease That Was Losing Money
- The Full Cost Model for Your Own Warehouse
- What 3PLs Actually Charge and What's Negotiable
- Volume, Consistency, and Growth: The Three Deciding Factors
- The SKU Count Complexity Factor
The £120,000 Warehouse Lease That Was Losing Money#
A Leeds-based health and wellness brand had grown to 2,800 orders per month and was paying a 3PL fulfilment centre £4.20 per order (including pick, pack, and dispatch). Total 3PL cost: £11,760/month. Someone in the team ran a back-of-envelope calculation: a 3,000 sqft industrial unit nearby was available for £1,800/month. They'd hire two full-time pickers at £26,000 each plus overheads. Total in-house cost: approximately £7,600/month. The saving looked like £4,160/month — nearly £50,000 annually. They signed the lease. Eighteen months later, they were seriously considering going back to the 3PL. The back-of-envelope had missed: two months of leasehold fit-out costs (shelving, racking, packing stations, security system, broadband, printer and label stations): £18,000. Monthly utilities (electricity, water, broadband): £620/month. Forklift lease for pallet deliveries: £280/month. Business rates: £340/month. Management time to run the warehouse operation: conservatively 15 hours/week. Their actual in-house cost was £10,100/month — £2,340/month less than the 3PL, but a far smaller saving than the calculation suggested, and at significantly higher operational risk and complexity.
The Full Cost Model for Your Own Warehouse#
Any honest own-warehouse cost model must include all of the following: base rent (typically £6-£12 per sqft per year for industrial space in UK secondary locations; £15-£25 in London and the South East); service charge and rates (typically 30-40% of base rent); fit-out and equipment (racking, packing benches, labellers, scanners, security): £8,000-£25,000 amortised over the lease term; staff wages including NI, pension, and holiday pay; utilities; insurance (commercial property and employer's liability); management overhead — someone has to manage the warehouse operation, handle staff issues, maintain equipment, and oversee carrier collections; and critically, the cost of scale inflexibility. If your volume drops 30% for a quarter, your fixed costs don't move. The 3PL, by contrast, scales down automatically. Model all of these costs against your expected order volume to get your true cost per order in-house. For most businesses, the honest in-house cost per order is £2.50-£4.50 at 3,000+ orders/month, vs £3.50-£5.50 through a good 3PL at similar volumes.
What 3PLs Actually Charge and What's Negotiable#
Third-party logistics fulfilment pricing has three main components: receiving (cost to receive and store your stock inbound), storage (monthly charge per pallet or per cubic metre for your stock), and pick-and-pack-and-dispatch (cost per order fulfilled). Receiving typically costs £8-£15 per inbound pallet. Storage runs £12-£25 per pallet per month. Pick-and-pack for a standard 1-SKU order is £1.50-£2.50; add £0.40-£0.80 per additional item. Dispatch (printing label, handing to carrier) is £0.50-£1.00. Total per-order 3PL cost for a standard single-item order: £2.40-£4.30, to which you add the carrier charge. At 500 orders/month, 3PL pricing is firm. At 2,000+ orders/month you should be negotiating — larger volumes unlock lower pick-pack rates and sometimes reduced storage. At 5,000+/month you have significant leverage. AskBiz prepares a monthly summary of your order volume, average order complexity, and product mix that you can take directly into 3PL rate negotiations.
Volume, Consistency, and Growth: The Three Deciding Factors#
Three factors determine which model wins financially. First: volume. As established, the in-house model typically becomes cost-competitive above 3,000 orders/month and clearly superior above 5,000/month for most order profiles. Second: volume consistency. If your business is highly seasonal — 80% of volume in Q4 — a fixed-cost warehouse is a poor match. You're paying for space and staff through the quiet months that you don't need. A 3PL scales with your volume automatically. Third: growth trajectory. If you're growing at 40%+/year, the right warehouse size today might be too small in 18 months. 3PLs absorb growth without capital investment; own warehousing requires planning permissions, fit-outs, and staff hiring to expand. Most businesses that make the in-house move successfully have: stable volume above 3,000 orders/month, relatively consistent order profiles (not wildly variable), and clear visibility that their volume won't significantly exceed their leased space within 3 years.
The SKU Count Complexity Factor#
Order volume isn't the only variable — SKU count matters enormously. A business with 50 SKUs and 3,000 monthly orders is easy to warehouse efficiently. A business with 3,000 SKUs and 3,000 monthly orders has a very different warehousing challenge — each SKU needs pick location, stock management, replenishment logic, and the operational complexity of 3,000 individual products to manage. For high-SKU businesses, 3PLs often retain their efficiency advantage longer because their WMS (Warehouse Management System) and physical infrastructure are already configured for complex SKU environments. Your own warehouse would need to invest significantly in WMS technology to achieve comparable picking accuracy and efficiency. If your SKU count is above 500, factor in the WMS cost — a capable system runs £500-£2,000/month for an SMB — when comparing own-warehouse to 3PL.
The Hybrid Approach: Keeping Core Products In-House#
A sensible middle path for many businesses is warehousing your core, high-velocity SKUs in-house and sending slow-moving or seasonal products to a 3PL. The 20% of your SKUs that generate 80% of your orders can be efficiently warehoused and picked from a relatively small space by your own team. The long-tail SKUs that move occasionally go to a 3PL where the storage and fulfilment cost per order is acceptable because you're not maintaining space for them in your own facility. This hybrid captures the cost advantage of in-house for your core range while avoiding the space inefficiency of warehousing products that sell once a week or less. AskBiz's inventory analytics identifies your fast-moving vs slow-moving SKUs and calculates the theoretical cost saving of the hybrid model vs your current arrangement.
Running the Numbers Before You Sign the Lease#
The most important step before committing to warehouse space is building a complete 36-month financial model that captures all costs, models three volume scenarios (base, 20% lower, 20% higher than forecast), and compares the total cost against your current 3PL spend. Most lease decisions that go wrong do so because the model missed costs (fit-out, management time, scale inflexibility) or over-estimated volume. AskBiz's warehouse vs 3PL calculator takes your actual order data — monthly volume, average order complexity, current 3PL pricing — and models the break-even point at which your own warehouse becomes cheaper, along with the payback period on fit-out investment. It's the analysis you need to make this decision well, and it takes about 20 minutes to run.
Make the Decision With Complete Data#
The warehouse vs 3PL decision is one of the most consequential capital decisions an SMB makes in its logistics journey. Done on incomplete information, it can lock you into a cost structure that doesn't serve your business. Done with complete data — full cost models, volume scenario analysis, break-even calculation — it's a decision you can make with confidence. AskBiz gives you the data infrastructure to model this properly and to track your actual costs against your projections once the decision is made, so you know whether the economics are working as expected.
People also ask
At what order volume should an SMB consider leasing their own warehouse?
Any honest own-warehouse cost model must include all of the following: base rent (typically £6-£12 per sqft per year for industrial space in UK secondary locations; £15-£25 in London and the South East); service charge and rates (typically 30-40% of base rent); fit-out and equipm…
What are all the costs of running your own warehouse?
Third-party logistics fulfilment pricing has three main components: receiving (cost to receive and store your stock inbound), storage (monthly charge per pallet or per cubic metre for your stock), and pick-and-pack-and-dispatch (cost per order fulfilled).
Is 3PL or own warehouse cheaper for 2,000 orders per month?
Three factors determine which model wins financially. First: volume. As established, the in-house model typically becomes cost-competitive above 3,000 orders/month and clearly superior above 5,000/month for most order profiles. Second: volume consistency.
What is the break-even between warehouse lease and 3PL fulfilment?
Order volume isn't the only variable — SKU count matters enormously. A business with 50 SKUs and 3,000 monthly orders is easy to warehouse efficiently.
How does AskBiz model the warehouse vs 3PL cost comparison?
A sensible middle path for many businesses is warehousing your core, high-velocity SKUs in-house and sending slow-moving or seasonal products to a 3PL.
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