Buying or Selling a Custom Product Manufacturing Business: The Complete Guide

Buying or selling a custom product manufacturing business comes down to jobs a buyer can still build, tooling a successor is allowed to use, and a lead who can run the next order when you are not at the machine. What trades is transferable cash flow after a real shop wage, invoices that match the bank, and equipment titled to the company. A job shop that builds one customer's part, a shop with a repeat custom line, and a plant that only stamps its own catalog SKU are different companies. Price customer-owned dies as if they were yours and you will use the wrong multiple.

The short answer: an owner-operated shop, where you are still the estimator and often the programmer, often trades around 2x–3.5x Seller's Discretionary Earnings (SDE) after a real production wage. A shop with a lead already running jobs, written customer agreements, and equipment titled to the company can move toward 2.5x–4.5x SDE. A managed plant a sponsor can add can be read on adjusted EBITDA. The building, if you own it, and the machines are usually separate from the multiple. Those ranges are directional. They are not a quote. How a platform buyer differs from an add-on is covered in the PE platform guide.

This guide is for custom product manufacturing — shops that design or build a product to a customer's spec, from a short-run part to a repeat custom assembly. It sits on our manufacturing sale page, next to the light manufacturing guide when the floor runs a catalog, and the sign manufacturing guide when the product is a sign. A contract plant that builds someone else's product on a long program is a later, different file. Do not blend a one-off prototype with a standing production order.

Companies that sell well have job jackets that match deposits, a second lead, machines in the company name, and a clear list of who owns the tooling. Companies that sell poorly are a founder who still programs every job, one customer at half the year, and dies the customer can take home.

This article is not legal, tax, or intellectual-property advice. Who owns a print, a mold, or a design, and what a purchase order allows, change by the contract and by state. Confirm them with qualified counsel before you sign a letter of intent.

Start with the manufacturing sale page or a confidential business valuation.

Why Custom Manufacturing Is Different

Custom manufacturing sells a part that did not exist until the customer asked. Several facts change the price:

• The tooling may not be yours. A die, a fixture, a mold, or a print the customer paid for does not convey because it sits in your rack. List what the company owns and what you may still run.
• You may be the engineer. If every quote and every setup waits for you, that is key-person risk. A transferable shop has a lead who has already released a job you did not program.
• The machines are collateral. A mill or a press on a note the buyer did not see comes out of proceeds. Serial numbers, hours, and titles belong in the file.
• A deposit on a job not started is a liability. Work in process should tie to a percent complete and the material still to buy.
• A prototype and a repeat release do not share a margin. Split them. Scrap and unpaid engineering changes come out before anyone talks about a multiple.

Who Pays: Local Buyers and Program Customers

Local and one-off work

Local and one-off work is the Main Street file. A nearby plant, an inventor, or a contractor who needs a part. Cash that never hits the operating account will not survive diligence. A shop in Florida and a shop in Ohio, Michigan, or Texas can both be real revenue. Put the job jacket in the file.

Repeat custom programs

Repeat custom programs are the business-to-business file a buyer can underwrite. A blanket order, a forecast, and a notice period. One customer at a third of the year is concentration. Ask, before you list, whether they will novate and whether they will leave the tooling. The answer belongs in the letter of intent.

Main Street versus a lower-middle-market shop

Main Street is a few machines, you quoting, and a leased bay. Price it on SDE. Lower middle market is a production lead who is not you, a quality step someone else can sign, and more than one customer who can audit the floor. That file can be read on adjusted EBITDA. Do not price a one-person prototype bench like a staffed custom plant.

What Buyers Underwrite

Jobs and the mix

Jobs and the mix are the proof. Buyers want twelve to twenty-four months of sales by customer and by type — prototype, short run, repeat release — tied to deposits. A single large tool buy belongs in the month it shipped. It is not the run rate.

Prints, tooling, and who owns them

Prints, tooling, and who owns them are the book. What you can legally rerun, what the customer can pull, and what is obsolete. A rack of dies for a part you will never make again is not an asset. A current fixture with a release schedule is.

Machines, the building, and the lease

Machines, the building, and the lease are liens and a right to keep cutting. A landlord who will allow industrial use, power that matches the equipment, and titles in the company name. If you own the building, say so. Buyers price the operating company and the real estate separately. SBA 504 can finance the building and long-lived equipment. It does not finance the goodwill of a print the customer owns.

Quality, scrap, and open jobs

Quality, scrap, and open jobs are the surprise. A reject rate you have not reserved, a customer debit, and a job you quoted and have not bought material for. Count raw stock and finished goods on the same day you walk the floor. Customer-owned material in your rack is not your inventory.

How Sellers and Buyers Should Read the Multiple

Use SDE when the founder is still quoting or still at the control. Add back only expenses a buyer will not keep, and only after a market wage for the lead and for programming. The valuation guide is the method. Machines are not inside the multiple. Customer tooling is not inside the multiple.

Getting the File Ready

Twelve to thirty-six months is the useful window. The sale-prep roadmap is the sequence. For a custom shop, the work is specific: name a lead who can quote and release a job, title the machines to the company, separate your fixtures from customer tooling, and age the material. Keep the process quiet. A customer that hears about a sale from a post will move the next release. The confidential sale guide is the rule.

Who Buys a Custom Shop

A machinist or fabricator who wants the floor, a customer who would rather own the source, and a sponsor adding a plant are the usual buyers. They do not underwrite the same file. The individual needs SBA, a second lead, and sometimes seller financing. The 7(a) cap is $5 million. The strategic buyer will ask which prints and which people stay. A service-business sale fails when the only person who can talk to the engineer is leaving.

Diligence, Financing, and the First Ninety Days

Diligence is job history, tax returns, the equipment list, titles, and a tooling log. The diligence guide is the calendar. Expect a lender to recast related-party rent, a wage you never paid, and a one-time tool. Working with an SBA lender means the machine list matches the titles. A quality of earnings review will rebuild scrap and customer debits from the bank, not from memory.

A holdback shows up when one customer is a third of sales or a machine note is still in your name. Tie it to a date. Open-ended earn-outs become arguments. A shop that cannot start a Monday without you is a job with a mill.

What Moves the First Offer

A die you cannot use, a deposit already spent, and a machine that is down belong in the letter so the price is for work a buyer can still ship. Name the lead, the wage, and the jobs they already release. A buyer who has not met that person will price a hire. Put the largest customer next to that name, and mark whether the tooling stays. Two years by month keep one prototype from becoming the run rate. Include who finishes open jobs after you are gone, and what the material and the labor still cost. The close should not assume a Friday wire if a lease or a title is still only you. Write the next ship date and the lead's name on the closing checklist before you ask for a price.

A buyer who has walked the floor once will still ask who programs the next setup, which prints you may rerun, and which machine is titled to the company. Answer with a name, a tooling log, and a serial number. Customer-owned fixtures should be labeled before anyone treats the rack as an asset. Obsolete stock and a special alloy for a part that ended should be written down the week of the count. A shop in Florida and a shop in Ohio or Texas can both be real work. The file is the job jacket, not the state on the door. Ask for that jacket before you negotiate.

Count hours on each machine the same week as the tooling log. A control only you can run is a hire, not a hidden asset. Scrap, a customer debit, and a job you have quoted but not released should sit beside the asking price so a one-time prototype cannot masquerade as monthly production. If the power service or the lease is sized for a machine you no longer own, say so before a lender walks the bay. The first offer moves when the lead who already releases work is in the room and the largest customer's tooling status is written on one page. Put the next release date and the programmer's name on the closing checklist, and list every fixture that leaves with the customer the day you close. Ask for both names before you sign the letter of intent.

Talk With Bridge Point

If you are preparing to sell a custom product manufacturing business — or you are a buyer who can staff the floor and hold the prints — Bridge Point Business Brokers can help you value the shop and keep the process confidential. Start with a valuation or contact us at (352) 515-0226.