How Long Does Due Diligence Take When Buying a Business in Ontario?

If you’re searching for how long due diligence takes on an Ontario business purchase, the honest answer is that there isn’t a standard number to give you. Due diligence timelines vary enormously based on the size and complexity of the business, how organized the seller’s records are, and how many third parties need to sign off before closing. Anyone who quotes you a fixed number before knowing your specific deal is guessing.

That doesn’t mean you can’t plan. Understanding what actually drives due diligence to run long, or move quickly, lets you build a realistic process with your lawyer and accountant instead of anchoring to a figure that may have nothing to do with your transaction.

Why There’s No Standard Timeline

Due diligence on a small, single-location asset purchase with clean books looks nothing like due diligence on a multi-location business with real property, employees, and a franchisor relationship all in the mix. The number and complexity of contracts, the state of the seller’s financial records, and how many third parties, such as landlords, lenders, franchisors, or regulators, need to consent, all change the shape of the process. There is no meaningful "typical" figure that applies across those situations.

Factors That Tend to Add Time

• Disorganized or incomplete seller records, which force back-and-forth requests instead of a clean initial document review
• Real property involved in the deal, which brings in title review and Ontario land transfer tax considerations on top of the business itself
• A franchise relationship, where franchisor approval, disclosure questions, and transfer conditions add a layer beyond the underlying business review
• Multiple material contracts requiring third-party consent, such as a lease that can’t be assigned without landlord approval
• Financing conditions, where a buyer’s lender runs its own parallel diligence and approval process
• Larger or cross-border deals that may trigger additional federal review requirements, such as pre-merger notification under the Competition Act or a net-benefit review under the Investment Canada Act, once the transaction exceeds the relevant thresholds

Factors That Tend to Keep Things Moving

• A seller with organized, accountant-prepared financial records and a clean minute book
• A straightforward asset purchase without real property or complex contract assignments
• Cooperative third parties, such as landlords and lenders, who respond quickly to consent requests
• A seller and buyer who are aligned on price and structure before formal due diligence begins, rather than still negotiating the fundamentals

Building a Realistic Process With Your Legal Team

Rather than asking how long due diligence "usually" takes, a more useful question is what your specific deal actually requires. Practical steps:

1. Get your lawyer and accountant involved early, ideally before you sign a letter of intent, so they can flag complexity up front
2. Build a due diligence checklist scoped to your specific deal, not a generic template
3. Identify which third-party consents, such as landlord, lender, franchisor, or regulator, will be needed, and start those conversations as early as possible
4. Run legal and financial due diligence in parallel rather than one after the other

Where Delays Most Often Show Up

Even in a well-run process, certain points tend to slow things down: waiting on a landlord’s response to a lease assignment request, waiting on a lender’s financing approval, waiting on a franchisor’s review and consent, or waiting on the seller to produce records that should have been ready from the start. Anticipating these choke points, and starting them early, does more to control your timeline than any general rule of thumb would.

Frequently asked questions