Five things drive what a machine shop pays for insurance: payroll and workers' comp class, injury and loss history, what your parts go into, the value and fire protection of your machines, and the limits your contracts demand. A new owner can influence most of them through records, shop controls and how the program is built, though final prices depend on carrier underwriting. That matters because premium comes out of the same earnings that service your loan. This guide gives no prices, because they vary too much by shop, state and carrier to quote honestly, and it is for new owners of job shops and precision parts makers.
The short answer
- Workers' comp is driven by payroll, class code and the experience mod (a premium multiplier built from past claims) you inherit, and injury history feeds the mod.
- Liability pricing follows what the shop makes, who buys it, the sales or payroll figure the carrier rates on, and what the customer contracts require, such as higher limits and additional insured wording.
- Property pricing follows the value of the machines and building, how they are protected from fire, and how old the equipment is.
- The levers a buyer controls are accurate records, a written safety program, correct classification, sensible deductibles and a clean submission. Cutting limits below what your lender or contracts require is not a lever.
What do underwriters price, and what can a new owner change?
For a machine shop, an underwriter wants the parts and materials, the customers' industries, the machine list with ages, payroll by job, the building and fire protection, and five years of loss runs. A new owner adds one more question the seller never faced: who runs the shop now, and did the work change? What underwriters want to see from a new owner covers how underwriters read a change of ownership.
| Policy it moves | Driver | Why it matters | What you can do |
|---|---|---|---|
| Workers' comp | Payroll and class | Machining, welding, assembly and field service can each land in a different class, and comp premium is a rate per $100 of payroll for the class, so a wrong class or wrong payroll changes every dollar | Reconcile payroll to the audit, correct misclassified roles, record payroll by job, and tell the insurer what the shop actually does. See the workers' comp guide |
| Workers' comp | Experience mod and injury history | The buyer usually inherits the seller's mod, and a repeat pattern of the same injury raises concern. The workers' comp guide owns the mod and the injury figures | Report the ownership change on time, check the mod for errors, manage open claims, document guarding, lockout and tagout, hearing protection and return-to-work |
| Liability | What the parts go into | A bracket for a furniture maker and a part for an aircraft or vehicle carry different products exposure | Tell the broker the end markets honestly and ask about aircraft or aviation products wording |
| Liability and package | Sales and other rating bases | These policies are priced on a basis the carrier chooses, such as sales or payroll. A shop's mix of job work, production runs and pass-through material can differ from what the seller's last application showed, which can overstate or understate cost | Ask which figure each policy rates on and whether purchased material is counted, update it to the shop's real figures and recheck it at audit |
| Liability and umbrella | Customer contract terms | A new aerospace or defense customer can ask for a higher products limit, aviation wording and cyber terms in one agreement, and each can need its own endorsement | Have the broker read each contract before you sign |
| Auto | Delivery vehicles and drivers | Auto is priced on the vehicles, drivers and how they are used, and parts delivered in personal cars raise hired and non-owned auto questions (cover for rented cars and employees' own cars on business errands) | Keep a vehicle and driver list, decide who delivers what, and confirm hired and non-owned coverage |
| Property | Machine and building values | Property pricing follows what is insured, the valuation basis and the age and condition of the machines | Build a machine list at replacement cost and keep it and the maintenance logs current |
| Property | Fire exposure | Oil and coolant mist, chips and dust are commonly named shop fire hazards, and carriers and lenders may ask about them | Document housekeeping, extinguisher checks, mist control and any sprinkler system |
| Cyber | Cyber controls | Controlled drawings and defense contract duties can change what a cyber policy needs to address; ask your broker how each carrier views them | Use multifactor sign-in, offline backups and tested restore steps |
| Property | Deductibles | A higher property deductible changes premium, but one lost spindle or one fire is a large single loss for a shop with a few expensive machines | Test the deductible against the cost of your most critical machine and your debt service, not the average year |
How does injury history show up in price?
Workers' comp is the policy with the most direct tie to a shop's hazards, and Bureau of Labor Statistics (BLS) data show that hand, arm and shoulder injuries make up most lost-time cases in machine shops, with back strains and contact with machines and objects also common. National counts do not predict your claims or your premium. The figures are in the workers' comp guide for machine shops.
What underwriters read is the record: five years of loss runs, the Occupational Safety and Health Administration (OSHA) injury log, open claims and the inherited mod. A buyer can influence that record. Written guarding checks, lockout and tagout steps for setups and tool changes, a hearing program where noise requires it, and a return-to-work plan all support a better submission. Safety programs that earn better insurance terms and return-to-work programs and claim costs go deeper.
How do your parts and customers change liability pricing?
General liability for a manufacturer generally includes products-completed operations coverage, which can respond to injury or damage a part causes after it leaves your hands, subject to the policy wording. That exposure follows the part. A bracket that goes into a vehicle, an aircraft or industrial equipment can cause larger losses than a decorative fitting, so carriers may ask where parts end up and whether the shop designs or only builds to the customer's print. A shop that engineers solutions or recommends materials and processes carries a design exposure that a print-only shop has less of, and may need errors and omissions coverage, which is separate from general liability.
Customer contract asks such as additional insured status, waivers and a higher products limit can push you toward an umbrella and endorsements, and each can add cost. Contracts, licenses and bonds for a machine shop lists them. Having the broker read a clause before you sign lets you negotiate it first.
A hypothetical example. A buyer takes over a 15-machine job shop that makes brackets for industrial customers. Six months later the shop wins a contract for parts that go into aircraft and starts welding and assembling some of them. Three things now move. The liability side raises a question about aircraft products wording. The workers' comp insurer may reclassify the work, because welding and assembly can take a shop outside a parts-only class. And the property schedule needs two new machines at replacement cost. A broker who hears about the contract before the shop signs can price all three before the first shipment. The scenario is illustrative, and carriers set their own terms.
How do machines, fire protection and the building affect property cost?
Property premium follows what you insure, how you value it and how the carrier views the fire hazard. Machines are often among the largest assets a shop insures, and the deal price is not their insurable value. Actual cash value and replacement cost pay differently after a loss, and a policy with replacement cost can cost more than one without it. A lower limit can look cheaper until a coinsurance penalty (a clause that cuts a claim when the limit is below a set share of value) reduces what you are paid. If you used a Small Business Administration (SBA) 7(a) loan above $50,000, the rules call for equipment collateral to be insured at full replacement cost (or maximum insurable value) with a lender's loss payable clause, and your lender may add terms, so confirm the limit with your loan documents before lowering it.
A submission with a current machine list at replacement cost, photographs of fire protection and five years of loss runs lets the carrier price the shop on facts instead of assumptions. It also shows you the true insurable value of the machines before a loss, not after. Results still depend on the carrier.
What should you not cut to save money?
Do not cut limits that your lender or customer contracts require, because lapses can trigger force-placed coverage (insurance the lender buys and bills to you), a breach of the supply agreement or a lost customer. Think twice before dropping customers' property coverage to save a small amount, because depending on your supply agreements and what your property form covers, a loss of their material may fall on you. On business income, a shop that depends on two critical machines should check the 72-hour waiting period in the standard Insurance Services Office (ISO) form, how the policy ends the period of restoration (the time the policy pays for, which ends when the property should be repaired or replaced with reasonable speed) when a machine is slow to replace, and whether extended business income (60 days in the standard form) or an extended period of indemnity covers the ramp back to full production.
Other levers to discuss include a higher deductible you can absorb, correcting class codes and clearing old open claims from the loss runs. Results depend on the carrier. See 12 ways to lower premium after an acquisition without cutting coverage and raising deductibles the smart way. If you model insurance as part of earnings before interest, taxes, depreciation and amortization (EBITDA), insurance savings as an EBITDA lever shows how to count it. Morrow can compare the inherited program with what your lender and contracts require before you change any limit; any new terms depend on carrier underwriting.
Keep reading
- Just Bought a Machine Shop? What Insurance Do You Need?
- Workers' Comp, Payroll and Class Codes for a Machine Shop
- How Much Should Insurance Cost for the Business I Just Bought?
- 12 Ways to Lower Premium After an Acquisition Without Cutting Coverage
- What Underwriters Want to See From a New Business Owner
- All guides for new business owners
Frequently asked questions
What is the biggest factor in machine shop insurance cost?
It depends on the line. For workers' comp it is payroll, class and injury history; for liability it is what your parts go into and what customers require; for property it is machine values and fire protection. Which dominates depends on your shop and the carrier.
Will a bad claim history from the seller raise my premium?
It can. The buyer usually inherits the seller's experience mod for workers' comp, and liability underwriters read the loss runs. Checking the mod for errors and closing old open claims can help, and results depend on the carrier.
Does buying new machines change my insurance cost?
It can raise property premium because insured values go up, and it can change equipment breakdown pricing. Add new machines to the schedule promptly so they are insured at replacement cost, and tell your lender if they are collateral.
Do aerospace or defense customers raise insurance cost?
They can change what you need to insure. Aircraft parts raise the question of aviation products wording, and defense work brings contract duties. Ask your broker how each carrier views the work before you commit to a contract.
Can I lower cost by choosing a higher deductible?
Often a higher deductible lowers premium, but you keep more of each loss. Raise it only to a level your cash flow and debt service can absorb, and check that it still meets lender and contract requirements.
References
- BLS: Survey of Occupational Injuries and Illnesses, Table R2, parts of body affected, private industry, 2023 to 2024
- BLS: Survey of Occupational Injuries and Illnesses, Table R4, events or exposures, private industry, 2023 to 2024
- NCCI: Workers Compensation and Employers Liability Insurance Policy, WC 00 00 00 C (copy hosted by Guard)
- U.S. Small Business Administration: SOP 50 10, Lender and Development Company Loan Programs
- Insurance Services Office: Business Income (And Extra Expense) Coverage Form CP 00 30 10 12 (copy hosted by Merlin Law Group)
- Insurance Services Office: Building and Personal Property Coverage Form CP 00 10 04 02 (copy hosted by Missouri Farm Bureau Insurance)
Just bought a business? Get your insurance reviewed.
Send Morrow the declarations pages, loss runs and key contracts you inherited. Morrow can review them against the business you bought, flag gaps and request quotes where it makes sense. Any new terms depend on carrier underwriting.
Morrow · 25 New Chardon Street, 4th Floor, Boston, MA 02114
This article is general information, not legal, tax or financial advice, and not a coverage determination. Coverage depends on the actual policy wording, carrier underwriting, your purchase agreement and your contracts. Ask your attorney and accountant about deal and legal questions.