Machine shop or precision machining business due diligence

Once a buyer is under a letter of intent on a machine shop, diligence narrows from whether the shop is worth pursuing to whether every representation the seller has made survives direct verification. A small number of specific findings — a machine that fails inspection, a certification at risk, a key customer signalling requalification — can each independently change the terms of the deal, which is why this stage moves methodically through documents and physical inspection rather than relying on the seller’s summary.

Inspect the machine fleet against its own paperwork

Every machine represented as active should be physically inspected and checked against its maintenance records, because a fleet that does not match its paperwork on inspection is one of the most common findings in this sub-sector — and it usually means real capacity is lower than represented. A CNC control old enough that replacement parts are becoming difficult to source is a specific, practical risk worth flagging machine by machine, not folded into a general condition assessment.

Confirm certification and quality history directly

ISO 9001 or AS9100 certification status, and any history of nonconformances or corrective actions, should be confirmed directly with the certifying body rather than taken from the seller’s summary alone, since the certification transfer path — and whether a re-audit or transition audit is required — depends on the deal structure and needs to be understood before closing, not assumed. Where key customer programs required PPAP or first-article approval, the documentation supporting that approval should be reviewed to confirm it is complete and tied to the shop entity or location the buyer is actually acquiring.

Verify who actually owns the tooling and fixtures

Customer-owned tooling and fixtures usually remain the customer’s property and must be tracked and returned or reassigned rather than treated as company assets, and a buyer should insist on a reconciled list — company-owned versus customer-owned — before accepting the seller’s asset schedule as accurate. Machine warranties and service contracts are generally assignable, but each one should be confirmed individually rather than assumed to transfer as a package.

Check the property and compliance history

A shop with a long operating history involving coolant, cutting fluid and metal-working fluids can carry undocumented environmental history at the property — old disposal practices, for example — and that risk is worth checking through a property records search and, where warranted, a Phase I environmental site assessment before closing. Where the shop does export-controlled work for aerospace or defence customers, the seller’s compliance history under federal export and import permit obligations is worth reviewing directly, since those customers will scrutinize a new owner’s standing before continuing to place work.

Request a WSIB clearance certificate and review product-liability exposure

A current WSIB clearance certificate should be requested directly from WSIB rather than accepted on the seller’s word, because Ontario’s system can attach successor liability for unpaid workplace-safety premiums to the purchaser of a business, and any gap here is a specific, quantifiable finding rather than a general compliance concern. Outside Ontario, the equivalent workers’ compensation board runs its own clearance process, and a buyer should confirm the correct provincial mechanism directly with that board rather than assume Ontario’s system applies.

Deal structure should also be reviewed for how it treats product-liability exposure on parts already shipped before closing: an asset purchase generally leaves that exposure with the selling corporation, while a share purchase carries it forward inside the entity being acquired, and this is worth confirming directly with counsel rather than inferring it from the purchase agreement’s general representations. Where the shop supplies safety-critical parts — aerospace, automotive, medical — this review deserves more than a passing mention in the diligence checklist, since the potential exposure is proportionally larger than it would be for a shop doing general job-shop work with no regulated end-use.

A buyer should also ask whether the shop has any outstanding compliance orders from its provincial workplace-safety regulator — in Ontario, the Ministry of Labour, Immigration, Training and Skills Development — since an open order tied to machine guarding, noise or heat-stress exposure is the kind of finding that needs resolving, or pricing in, before closing rather than discovered afterward.

What a finding actually means once you have it

A machine that fails inspection against its maintenance records is a capital-expenditure finding that belongs in the price, not a reason on its own to abandon the deal. A key customer’s procurement team confirming that a change of ownership triggers requalification is a forward-revenue timing risk that may call for a holdback or a longer close rather than an outright walk-away. Undocumented environmental history discovered late is the finding most likely to genuinely stall a deal, because the cost and timeline to resolve it are often uncertain at the point it surfaces. And a departing owner who is also the shop’s only qualified programmer, or the sole relationship holder for its largest account, is a key-person risk that a buyer should price or structure around directly — through a transition agreement, an earn-out, or a price adjustment — rather than assume will resolve itself.