Key takeaways
- You already own the hard part — co-packing sells line-hours you're currently paying for and wasting.
- Paperwork is the real barrier, not equipment: get GMP-audited now, buy SQF when a signed customer justifies it.
- Halve every first-time brand's forecast. If the deal only works at their number, it doesn't work.
Most advice on how to start a co-packing business is written for someone who doesn't own a plant yet. You do. You've got lines, a license, and a crew that shows up at 6 a.m. — which means you're not starting a company, you're adding a revenue stream to one that already runs. What stands between you and your first co-packing check is paperwork, pricing, and one signed brand.
You're Selling Hours, Not Building a Company
Your plant has a fixed number of line-hours every week, and you pay for all of them. Mortgage, insurance, maintenance, supervisors — those bills arrive whether product moves or not. Picture a 38-person sauce plant in Ohio that runs its kettles hard Monday through Wednesday and lets them sit Thursday and Friday. The two idle days cost almost as much as the three busy ones.
Co-packing turns those dead hours into cash. Most mid-size food plants sit somewhere between 50 and 70 percent utilization, and what good capacity utilization looks like is higher than most owners believe is possible. Because your fixed costs are already covered by your own production, every added point of utilization falls almost straight to the bottom line.
That's the whole case. Becoming a contract manufacturer doesn't require buying anything. It requires selling something you already own and currently throw away every week.
Co-Packing Business Requirements: The Paperwork Layer
You have more of this done than you think. The non-negotiables:
- FDA food facility registration. Free, and if you sell food in the US you already have it. It renews every even-numbered year between October and December — confirm yours is current before you pitch anyone.
- State processing license. Usually $100-$1,000 a year. Your existing license typically covers contract production, but call your inspector — a handful of states treat co-packing as a separate activity.
- Process authority letters. Acidified sauces and low-acid canned products need a scheduled process from a recognized process authority. Budget $500-$2,500 per product and two to six weeks per letter.
- Product liability insurance. Tell your carrier you're running other people's brands before you do it. Co-packers commonly carry $2-5M in product liability, and a brand's retailer will want a certificate naming them as additional insured.
Then comes the certification layer, where the real money lives. Brands headed for national retail often can't buy from an uncertified plant, because their retailers require a GFSI-benchmarked audit up the chain.
| Requirement | Rough cost | Who asks for it |
|---|---|---|
| FDA facility registration | Free | Federal law — everyone |
| State processing license | $100-$1,000/yr | Your state |
| Third-party GMP audit | $2,000-$6,000 | Smaller brands, regional retail |
| SQF or BRCGS certification | $20,000-$50,000 first year, all-in | National retail, larger brands |
| Organic handler certificate | $1,000-$3,500/yr | Brands with organic SKUs |
Don't buy certifications on spec. A basic GMP audit is cheap and opens the first tier of customers. Let a signed customer with real volume justify the SQF spend — plenty of plants have paid $40,000 for a certificate that no winnable customer ever asked about.
How to Become a Co-Packer With the Equipment You've Got
The most common first equipment mistake is buying any. New co-packers see a prospect's product, get excited, and finance a $150,000 pouch line for a customer who churns in eight months. Now the spare capacity problem is worse, and it has a loan payment attached.
Sell what your line already does. If you run hot-fill glass from 8 to 32 ounces, that's the offer. If you kettle-cook and pack off into totes, that's the offer. Format discipline feels limiting until you realize the market is full of brands that need exactly your format and can't get a callback from the big co-packers.
Put it on a one-page capability sheet: containers and fill sizes you run, batch minimums, allergens present in the plant, certifications held, and honest changeover time. A brand's operations person can qualify you in ninety seconds from that page. That's the point.
Price the Work Before You Pitch the Work
Two models cover most of the industry. Tolling: the brand supplies ingredients and packaging, you supply labor and line time, and you charge per unit or per hour. Turnkey: you procure everything and sell finished goods. Tolling is the right first move — less working capital at risk, less procurement to learn, and a bad batch costs you hours instead of a trailer of ingredients you paid for.
Whichever model you pick, set your floor before the first sales call. Know your fully loaded hourly line cost, bake changeover into the price, and hold a batch minimum that protects it. The math deserves its own article — how to price co-packing services walks through it line by line. The short version: underpricing your first customer to win them sets a number you'll fight to raise for years.
Your First Customer Won't Find You
A new co-packer has no reviews, no case studies, and a website nobody visits. Inbound shows up in year three, maybe. First customers come from three places instead.
Referrals: your ingredient suppliers, your label printer, and the full co-packers who turn work away all know brands hunting for a line — tell every one of them you're open for contract work. Brokers and consultants: emerging-brand advisors place products with plants for a living. Direct outbound: a list of brands in your format and region, contacted one at a time, which is unglamorous and works. The best first targets are brands outgrowing a commercial kitchen or self-manufacturing in a garage bay — their volumes match your spare hours, and they need you more than you need them. The full playbook is in how to find CPG brand customers for your co-packing business.
If you'd rather run the plant than run prospecting, that's a fair choice — outbound is a full-time job, and it's the one Feed The Line does for co-packers who want the meetings without the cold-calling.
How to Start a Co-Packing Business in 90 Days
- Days 1-15: Confirm your FDA registration and state license cover contract work. Call your insurance carrier. Calculate your fully loaded hourly line cost.
- Days 15-30: Book a third-party GMP audit. Write the one-page capability sheet. Set tolling prices and batch minimums.
- Days 30-60: Tell every supplier, broker, and neighboring plant you're open for contract work. Build a list of 100 brands in your format and start outbound.
- Days 60-90: Run trial batches for your two best prospects. Charge for them — a paid trial separates tourists from buyers.
None of this needs a consultant or a construction crew. It needs you to decide that the idle hours on your line are a product, then sell that product like you mean it.
Frequently asked questions
Q-01Do I need a special license to co-pack for other brands?
In most states your existing food processing license covers contract manufacturing, but confirm with your state inspector because a few treat it as a separate registration. You'll also need a current FDA food facility registration and, for acidified or low-acid products, a scheduled process letter for each item you run. The bigger hurdle is usually certification — retail-bound brands increasingly require a GFSI audit like SQF or BRCGS.
Q-02How much does it cost to start a co-packing business if I already own a food plant?
If your plant is already licensed and running, plan on roughly $5,000-$15,000 to get sale-ready: a third-party GMP audit, updated product liability insurance, and process authority letters. A full SQF or BRCGS certification adds $20,000-$50,000 in the first year, but you can defer that until a signed customer requires it. No new building, no new lines.
Q-03How do co-packers get their first customers?
The first customer usually comes from referrals — ingredient suppliers, brokers, and full co-packers who turn work away — or from direct outbound to brands outgrowing self-manufacture. Emerging CPG brands leaving commercial kitchens are the most common first fit because their volumes match spare capacity. Waiting for inbound rarely works; a new co-packer with no track record has to go get the first three customers.
Written by
Murtaza Udaypurwala
Founder, Feed The Line · Director, DESENO Media Agency
Murtaza runs Feed The Line, the outbound revenue engine that fills co-packer lines with qualified CPG brands. He writes about capacity economics, MOQ math, and pipeline for food & beverage plant owners.
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