How do UK machine shops find subcontract work?

The main routes are: repeat work and referrals from existing customers; approaching local engineering firms directly (industrial estates are dense with buyers); trade directories and tender portals; and online manufacturing platforms that send vetted jobs to shops with matching capability. Most shops end up using a mix — referrals for the steady base and a platform or direct approach to fill the gaps.

How much does idle CNC machine time cost?

An idle spindle still carries its share of finance, rent, power, insurance and staff cost. If a 3-axis mill is charged at roughly £50–£60 an hour when it's cutting, every hour it stands still is that much contribution lost — you don't get the hour back. That's why shops will often take subcontract work at a sensible rather than a premium rate: it converts fixed overhead into contribution.

Should I quote low to win subcontract work?

No — racing to the bottom trains buyers to expect it and leaves nothing for the inevitable re-work or late material. Quote a rate that covers your true machine-hour cost plus margin, and win on the things buyers actually value: realistic lead times you hit, responsiveness, and parts that pass inspection first time.

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How to win CNC subcontract work in the UK

An idle spindle is the most expensive thing in a machine shop. This guide covers where subcontract work actually comes from in the UK, what buyers look for when they pick a shop, and how to quote so you win jobs without giving away your margin.

The short version: most shops fill capacity with a mix of referrals, direct local approaches and online platforms. Buyers care less about being the cheapest than about hitting the lead time you promised and parts that pass inspection first time.

Why spare capacity costs you more than you think

Your machines carry finance, rent, power, insurance and skilled staff whether they're cutting or not. If you'd charge roughly £50–£60 an hour for 3-axis milling, every idle hour is that much contribution you never get back — it can't be banked and used next week. That's the honest reason shops will take sensible subcontract work at a fair rather than a premium rate: it turns fixed overhead into contribution.

Where UK subcontract work actually comes from

Route	What it's good for	The catch
Existing customers & referrals	The steadiest, highest-margin work	Slow to grow; dries up if a customer is lost
Direct approach (local estates)	Nearby buyers, easy logistics, sticky relationships	Legwork — someone has to knock on doors
Trade directories & tender portals	Volume of enquiries	Often price-led; a lot of quoting for little return
Online manufacturing platforms	Jobs come to you, already specified	You need to be genuinely competitive on lead time

Most shops that stay busy use a mix: referrals for the base load, and direct or platform work to fill the gaps between big jobs.

What buyers actually look for

Having sat on both sides of this, price is rarely the deciding factor once you're in a sensible range. What wins repeat work is:

Capability match — the right machines and envelope for the part, not "we'll find a way".
A lead time you actually hit. A realistic 3 weeks beats an optimistic 10 days that slips.
Parts that pass first time — an inspection report with the job saves everyone a week.
Responsiveness. Buyers chase suppliers who go quiet. Answer quickly and you'll be remembered.
Clear communication when something changes — late material, a tooling problem, a query on the drawing.

How to quote without racing to the bottom

Undercutting everyone trains buyers to expect it, and leaves nothing in the job for re-work or late material. Instead:

Know your true machine-hour cost (overhead ÷ realistically sellable hours), then add margin — don't guess from what you think a competitor charges.
Price the setup honestly. A one-off carries the full setup; say so rather than burying it and losing money on small batches.
Quote the lead time you can defend when the shop is busy, not on a good week.
Be clear on what's included — deburring, inspection, certs, finishing — so you're not compared against a quote that excludes them.

Get set up to receive work

Whichever routes you use, a few things make you much easier to give work to: an up-to-date capability list (machines, envelope, axis count, materials you're happy with), realistic standard lead times, the ability to read STEP files, and a simple inspection process you can evidence.

Fill your idle machine time — free

Join our UK partner network and we'll send you paid CNC jobs that match your machines. No joining fee, no monthly cost, no quoting for work you don't want — you set your own price and lead time, and only ever get paid.

Join free as a partner

Frequently asked questions

Do I have to take every job I'm sent?

On a well-run platform, no. You should see the job — model, drawing, quantity, material — and choose whether to request it. If it doesn't suit your machines or your schedule, you skip it.

How quickly do I get paid?

That depends on the arrangement, but for subcontract work 30-day terms from invoice are the UK norm. Agree it up front and in writing.

Is subcontract work worth it if my rates are already good?

It's worth it for the gaps. Nobody sensible fills a full order book with subcontract work — but using it to cover the weeks between big jobs turns dead time into contribution.

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