Deciding between in-house fulfilment and a 3PL is rarely about which model is better in the abstract. It is about whether your business, at its current order volume and stage of growth, is better served by keeping fulfilment under your own roof or handing it to a specialist partner. Both approaches work, and both have genuine trade-offs, so the honest answer is that the right choice depends on where you are right now rather than which option sounds more impressive. 

This guide walks through what each model involves, what they really cost once the hidden costs are counted, the concrete signs that a business has outgrown doing it themselves, and the cases where staying in-house still makes sense. It closes with a straightforward comparison and a short checklist for anyone ready to make the move. 

What Is In-House Fulfilment? 

In-house fulfilment means a business manages every part of order fulfilment itself, using its own space, staff and systems. That covers receiving and storing stock, picking and packing orders as they come in, arranging shipping with a courier, and handling any returns that come back. 

Most ecommerce brands start this way, because at low order volumes it is the simplest option and gives the founder complete control over how every order looks and feels. The trade-off is that every part of that process, from the shelving to the staff rota, has to be built and managed internally, and none of it is optional once order volumes start climbing. 

What Is a 3PL (Third-Party Logistics)? 

A 3PL, short for third-party logistics, is a specialist partner that manages fulfilment on a business’s behalf. Stock is sent to the 3PL’s warehouse, and the 3PL’s own staff and systems handle storage, picking, packing, shipping and returns, using infrastructure the business never has to build itself. 

The business still owns the customer relationship and the brand experience. What changes is who is physically holding the stock and running the warehouse floor. Most 3PLs, including Bray Solutions, integrate directly with platforms like Shopify and Amazon so that orders flow through automatically rather than needing manual handling on either side. 

The Real Cost Comparison: In-House vs 3PL 

The fixed and hidden costs of in-house fulfilment 

In-house fulfilment looks cheaper on paper at very low volumes, largely because most of its real costs are easy to overlook until they show up on a bank statement. Beyond obvious costs like packaging materials, a business running its own fulfilment is also carrying warehouse or storage space, racking and equipment, staff wages and training, software for stock and order management, insurance, and the ongoing admin time of managing all of it, which rarely gets costed properly. 

Staffing costs in particular have been moving in one direction. The UK’s National Living Wage rose to £12.21 an hour from 1 April 2025, a 6.7% increase, as confirmed by the UK Government’s official announcement. For a business relying on hourly warehouse staff to pick and pack every order by hand, that kind of rise lands directly on the cost of every single order shipped. 

How 3PL costs are structured 

A 3PL typically charges on a pay-as-you-go basis across storage, picking and packing, and shipping, so cost scales with activity rather than sitting there as a fixed overhead regardless of how many orders actually go out. That structure removes the need for the upfront capital a business would otherwise sink into warehouse space, equipment and a permanent headcount before it even knows how much it will grow. 

A Forrester Consulting study commissioned by Amazon found that 43% of ecommerce executives managing fulfilment in-house had not been able to reduce their logistics costs, and that 77% of businesses who outsourced to a 3PL reported a transformational improvement in reducing their operating costs. The same research found that 42% of businesses handling fulfilment in-house could not reliably handle spikes in demand, which is exactly the kind of cost pressure that tends to build quietly until a peak season exposes it all at once. 

Signs You’ve Outgrown In-House Fulfilment 

A handful of concrete, checkable signals tend to show up before a business consciously decides it is time to outsource. Any one of these on its own might just be a bad week. Several of them together, most weeks, is a business that has outgrown doing it in-house. 

• Order volume has climbed to a point where packing consistently spills into evenings or weekends rather than fitting inside normal working hours. 

• Storage space originally meant for stock is now also being used for packing, staff, or anything else that will fit, because there is nowhere else to put it. 

• Returns are taking days rather than hours to process, and the backlog gets worse every peak period rather than clearing. 

• Shipping errors, mispicks or late dispatches are creeping up specifically when volume spikes, rather than staying flat. 

• A new sales channel, marketplace, or international market is being delayed or turned down because the fulfilment operation genuinely could not cope with the extra volume. 

When In-House Fulfilment Still Makes Sense 

Outsourcing is not automatically the right call for every business, and a genuinely useful comparison has to say so. In-house fulfilment still tends to make sense in a few specific situations. 

• Very early-stage or low, predictable order volumes, where the overhead of onboarding a 3PL would outweigh the time it currently takes to pack orders by hand. 

• Highly bespoke, made-to-order or hand-finished products where the founder or a small trained team genuinely needs to be hands-on with every unit. 

• A strong business reason to keep fulfilment hyper-local, such as same-day delivery within one city or a retail counter that also ships online orders. 

For businesses in one of these categories, the smarter move is usually to keep fulfilment in-house for now and revisit the decision once volume, space or staffing pressure genuinely changes, rather than outsourcing before it is actually needed. 

In-House vs 3PL: Side-by-Side Comparison 

How to Move from In-House to a 3PL 

• Once the signs above start adding up, moving to a 3PL is a manageable, well-trodden process rather than a leap into the unknown. A few practical steps make the transition smoother. 

• Pull together real numbers on current order volume, SKU count, returns rate and peak-season swings before speaking to any provider, so the conversation is grounded in your actual operation rather than guesswork. 

• Ask a prospective 3PL directly about minimum order values, integration with your sales platform (Shopify, Amazon, or others), their courier network and rates, and exactly how returns are handled. 

• Confirm what onboarding actually involves: how stock is transferred, how long the transition typically takes, and what support is in place while systems are being connected. 

Why Scaling Ecommerce Brands Choose Bray Solutions 

Bray Solutions works with ecommerce and contract packing clients from its base in Peterborough, supporting brands across East Anglia and the wider UK as they move past the point where in-house fulfilment can keep up. The brands that get the most from working with a 3PL tend to be exactly the ones described above: consistent, growing order volumes, a clear product range, and a genuine need to free up time for sales, product and marketing rather than warehouse admin. 

For a closer look at what Bray’s own 3PL service includes, see the 3PL services page, or get in touch for a quote based on your own order volume and product range. 

FAQs 

What is the difference between in-house fulfilment and a 3PL? 

In-house fulfilment means a business handles its own storage, picking, packing, shipping and returns using its own space and staff. A 3PL is a specialist partner that takes on all of that on the business’s behalf, using its own warehouse, technology and courier relationships. 

How many orders a day before you need a 3PL? 

There is no single number that applies to every business, since it depends on space, staff and product type as much as order count. As a general pattern, brands tend to start feeling the strain once order volume becomes consistent and daily rather than occasional. 

Is a 3PL cheaper than in-house fulfilment? 

It depends on volume. At very low order volumes, in-house fulfilment can be cheaper simply because there is less to outsource. As volume grows, the fixed costs of running fulfilment in-house (space, staff, equipment) tend to overtake the pay-as-you-go cost of a 3PL, which is why most businesses that switch do so as they scale rather than from day one. 

Can you switch back from a 3PL to in-house fulfilment? 

Yes. Some businesses do move fulfilment back in-house, usually once they have reached a scale where building their own dedicated operation becomes more cost-effective than outsourcing. It is a less common move than switching to a 3PL, but it is not a one-way door.