Most product founders hit this crossroads at some point. Orders are growing, outsourcing costs are adding up, and the idea of owning your own production line starts to sound appealing. But the decision to bring manufacturing in-house is one that trips up a lot of businesses, often because the numbers don’t say what founders think they will.
Here’s a breakdown of the factors that actually matter so you can make the right call for your business.
Volume Thresholds That Actually Justify the Move
The single biggest factor is volume. Buying machinery, hiring operators and setting up a production floor only makes financial sense when your output is high enough to spread those fixed costs thin.
For most physical product businesses, that tipping point comes later than expected. If you’re producing a few hundred units a month, the per-unit cost of running your own equipment will almost certainly be higher than what a specialist manufacturer charges. They’ve already paid off their machines and they’re running jobs for dozens of clients, which keeps their costs low.
A rough benchmark: if your production volumes aren’t enough to keep a machine running at least 60-70% capacity for a full working week, you’ll likely lose money compared to outsourcing. Most manufacturers actually run well below that, with some studies suggesting average utilisation rates as low as 26-28%. Factor in maintenance, tooling wear and downtime, and the gap only widens.
What the Capital Outlay Really Looks Like
It’s easy to underestimate the upfront cost. A single industrial CNC machine can cost anywhere from £15,000 for an entry-level 3-axis mill to well over £500,000 for a high-end 5-axis machining centre. Then add extraction systems, tooling, software licences, floor space and electrical upgrades. For a production-ready setup, you’ll typically need to budget an extra 15-20% of the machine cost for first-year tooling and consumables alone.
Many founders also forget the ongoing costs. Machines need servicing. Cutters and bits need replacing. Software needs updating. And if something breaks down mid-run, you’ll absorb the full cost of that delay yourself, rather than having a supplier handle it on their end. For businesses that need precision cutting or complex shaping but don’t have the volume to justify their own setup, outsourcing to experienced providers that offer CNC routing services in the UK will often deliver better results at a fraction of the capital commitment.
The Skills Gap Most Founders Overlook
Owning a machine doesn’t mean you can run it well. CNC operation, injection moulding, laser cutting and similar processes all require trained operators who understand tolerances, material behaviour and machine calibration.
Finding and retaining that talent is a genuine challenge. Over 70% of UK manufacturers report difficulty recruiting skilled workers, and CNC machinists are among the hardest-hit roles. Experienced professionals in this space typically command salaries of £27,000 to £45,000 depending on the role, and the shortage is especially acute outside major manufacturing hubs.
If you hire the wrong person or try to muddle through with a steep learning curve, you’ll burn through materials and time. Reject rates will be high. Lead times will suffer. And the quality your customers expect will drop before it improves.
When In-House Production Does Make Sense
There are genuine scenarios where bringing production in-house is the right move. Your volumes are consistently high and growing steadily. You need rapid turnaround that no external supplier can match. Your product requires proprietary processes you don’t want to share. Or quality control issues with suppliers have become a recurring problem.
Even then, most founders will benefit from a phased approach. Start by bringing one process in-house while keeping the rest outsourced. That will limit your risk and give you time to build internal capability before going all-in.
Keep Outsourcing Longer Than You’d Think
Here’s what catches most people off guard: the break-even point for in-house manufacturing is almost always further away than it looks on a spreadsheet. Specialist fabrication partners invest heavily in equipment, training and process optimisation. They’ll produce your parts faster, more accurately and at a lower per-unit cost than a newly set-up in-house operation can manage for the first year or two, sometimes longer.
The smart move for growing businesses is to keep outsourcing until the numbers genuinely stack up. Use that time to refine your product, build demand and save capital for when the investment will actually pay off. A premature move into in-house production has stalled more promising businesses than most founders care to admit.