Quick answer: In-house fulfilment makes sense when you are shipping fewer than 150 to 200 orders a month and need tight control over packaging and quality. Above that threshold — or when packing is taking more than a day per week of your time — a 3PL almost always reduces your cost per shipment and frees you to focus on growth.
What is 3PL Fulfilment?
Third-party logistics (3PL) means outsourcing your warehousing, picking, packing and shipping to a specialist company. You send your stock to their warehouse; when an order comes in, they fulfil and dispatch it on your behalf. Your customer gets a parcel, usually without knowing a third party was involved.
3PL is not the same as dropshipping. With dropshipping, you never hold stock — the supplier ships directly to the customer. With 3PL, you own the inventory and pay the 3PL to store and ship it.
What is the Difference Between 3PL and In-House Fulfilment?
| In-house | 3PL | |
|---|---|---|
| Stock location | Your premises | 3PL warehouse |
| Cost structure | Fixed (space, time, packaging) | Variable (per pick, per shipment) |
| Scalability | Limited by space and staff | Scales with order volume |
| Control | High — you oversee everything | Lower — depends on 3PL quality |
| Setup effort | Minimal initially | Onboarding takes 2 to 4 weeks |
| Minimum order volume | None | Usually 100 to 200 orders/month |
| Best for | Low volume, specialist packaging | Growth stage, high volume |
When Should You Switch to a 3PL?
These are the signals that suggest in-house fulfilment is holding your business back:
- You are spending more than one full day a week on packing and shipping. That time has a real cost — it is time not spent on marketing, product development or customer relationships.
- Your order volume exceeds 150 to 200 per month. At this point, the per-unit economics of a 3PL typically become competitive with or cheaper than doing it yourself.
- You are running out of space. Storing stock at home or in a rented unit that is bursting has a real overhead cost, often underestimated.
- You are missing dispatch deadlines during peak periods. If Black Friday or a product launch breaks your fulfilment, you are at capacity.
- You want to expand to new channels or markets. Selling into Europe or the US is much simpler when a 3PL with international carrier relationships is handling dispatch.
How Do You Choose a 3PL Provider in the UK?
The quality of 3PL providers varies enormously. The right questions to ask before signing anything:
Location: Where is their warehouse? A Midlands-based 3PL can often reach 90% of UK postcodes next day. If you are selling internationally, check whether they have EU fulfilment capabilities or carrier partnerships for cross-border shipping.
Tech integration: Do they integrate directly with Shopify, Magento or your platform? A clean integration means orders flow automatically — no manual uploads. Most reputable UK 3PLs support Shopify natively.
Minimum commitments: Some 3PLs require minimum monthly order volumes or minimum storage spend. If you are not yet at scale, look for providers with low or no minimums — Huboo and Zendbox are both known for being accessible to smaller brands.
SLA and accuracy rate: Ask for their pick accuracy rate (anything below 99.5% is concerning) and their dispatch SLA. Same-day dispatch for orders placed before a cutoff time should be standard.
Returns handling: Can they process returns, restock sellable units and flag damaged stock? Returns handling is often an afterthought in 3PL contracts and a significant source of operational pain later.
Red flags: vague pricing that makes it hard to calculate your actual cost per shipment, no direct account management contact, or reluctance to share performance metrics.
What Are the Hidden Costs of Using a 3PL?
The headline per-shipment rate is never the full cost. A complete picture includes:
- Storage fees — typically charged per pallet, per bay or per cubic metre per month. These add up quickly for slow-moving SKUs.
- Inbound receiving fees — charged per unit or per pallet when you send stock to their warehouse
- Pick fees — usually per item picked, plus a base fee per order
- Packaging materials — either you supply branded packaging (which requires storage space at their end) or you use theirs
- Returns processing — often charged per return received and processed
- Minimum monthly fees — if your volume drops, you may still owe a minimum charge
- Account setup and onboarding — one-off fees at the start
When comparing 3PLs, build a model using your actual average order value, number of items per order, average returns rate, and SKU count. The cheapest headline rate rarely wins on total cost.
Is Dropshipping a Third Option Worth Considering?
Dropshipping removes the stock risk entirely — you only pay for goods when a customer orders them. For testing new products or niches, this is genuinely useful. But for a serious ecommerce brand, dropshipping has significant limitations:
- You have no control over dispatch speed or packaging quality
- Margins are lower because your supplier is absorbing the fulfilment cost in their price
- You cannot differentiate through unboxing or branded packaging
- Stock availability is outside your control
Dropshipping is a starting point, not a long-term fulfilment strategy for a brand that wants to build customer loyalty.
UK 3PLs Worth Considering
| Provider | Best for | Notes |
|---|---|---|
| Huboo | Small to mid-size brands | Low minimums, good Shopify integration |
| Zendbox | Growing DTC brands | Strong tech, UK-focused |
| Fulfilment by Amazon (FBA) | Sellers on Amazon | Best for Amazon, poor for off-platform |
| Torque | Premium brands, quality packaging | Higher cost, white-glove service |
| James and James | Mid to large volume stores | Established, good international options |
The Honest Summary
In-house fulfilment feels lower-cost than it is because the time you spend packing boxes rarely gets priced properly. Once you account for your time, space costs and the ceiling it puts on your capacity to scale, the break-even point with a 3PL arrives earlier than most store owners expect.
The transition is disruptive for a few weeks — onboarding a 3PL requires sending stock, integrating systems and adjusting to someone else handling your orders. But the stores that make the move at the right time almost never go back.
