Avoiding Hidden Pitfalls: A Lawyer’s Guide to the Agreement of Purchase and Sale

For most people, purchasing or selling a home is one of the largest financial transactions they will ever make. While buyers and sellers often focus on purchase price, mortgage rates, or market trends, one document has the greatest legal impact on the transaction: the Agreement of Purchase and Sale (APS).

In Ottawa’s 2026 housing market, where inventory has improved and negotiations have become more detailed, the terms contained in the APS are more important than ever. A well-drafted agreement can protect your interests and reduce the risk of disputes, while overlooking key provisions can lead to unexpected costs, delays, or even litigation.

This article explains some of the most important legal issues found in an Agreement of Purchase and Sale and highlights common pitfalls that buyers and sellers should understand before signing.

What Is an Agreement of Purchase and Sale?

The Agreement of Purchase and Sale is the legally binding contract between a buyer and a seller that sets out the terms of a real estate transaction. Once the agreement is accepted and any conditions are satisfied or waived, both parties are generally obligated to complete the transaction according to its terms.

Although Ontario real estate agents commonly use standard forms prepared by the Ontario Real Estate Association (OREA), these forms can be modified through schedules, amendments, and additional clauses. Even small changes to the wording of a clause may significantly affect the parties’ legal rights and obligations.

Because the APS governs the transaction from acceptance through closing, it is essential that both buyers and sellers understand its contents before committing to the purchase or sale of a property.

Price Is Only One Part of the Contract

Many buyers assume that the purchase price is the most important term of the agreement. While price is certainly significant, numerous other provisions can have substantial financial and legal consequences.

For example, the APS addresses matters such as:

• The amount of the deposit and how it will be held.
• The closing date.
• Included and excluded chattels and fixtures.
• Adjustments for property taxes, utilities, condominium fees, and fuel.
• Conditions relating to financing, inspections, or the review of condominium documents.
• Representations and warranties made by the seller.
• Remedies if either party fails to close.

Failing to review these provisions carefully may result in unexpected obligations after the agreement has been signed.

Understanding Conditions

One of the most important aspects of an APS is whether the agreement contains conditions.

Common conditions include:

• Financing approval.
• Home inspection.
• Lawyer’s review of condominium Status Certificate.
• Sale of the buyer’s existing property.
• Insurance availability.

Conditions are designed to protect the parties by allowing additional time to investigate matters before becoming fully committed to the transaction.

However, conditions must be drafted carefully. Poorly worded conditions may create uncertainty regarding whether they have been satisfied or properly waived. Missing deadlines for fulfilling conditions can also cause an agreement to become void or lead to disputes between the parties.

Others Costs That Can Affect Your Budget

Many first-time buyers focus primarily on the purchase price and mortgage payments. However, there are various adjustments and closing costs that should be anticipated well before the closing date.

These may include:

• Ontario Land Transfer Tax.
• Municipal Land Transfer Tax (where applicable).
• Legal fees and disbursements.
• Title insurance premiums.
• Property tax adjustments.
• Condominium common expense adjustments.
• Utility adjustments.
• Registration fees.

Understanding these financial obligations early can help buyers avoid unpleasant surprises at closing.

Included Items Are Not Always Obvious

Disputes frequently arise over what is included with the property.

The APS distinguishes between fixtures, which generally remain with the property, and chattels, which are movable items that may only be included if specifically listed.

Common examples include:

• Appliances.
• Window coverings.
• Light fixtures.
• Garage door openers.
• Garden sheds.
• Wall-mounted televisions.
• Electric vehicle charging stations.

If an item is important to the buyer, it should be clearly identified in the APS rather than relying on assumptions.

Seller Disclosure Has Limits

Ontario law distinguishes between patent defects, which are visible upon reasonable inspection, and latent defects, which are hidden and may not be readily discoverable.

While sellers are generally not required to disclose every imperfection in a property, they may have legal obligations to disclose certain latent defects, particularly where those defects:

• Make the property dangerous.
• Render the property unfit for habitation.
• Were actively concealed.
• Would make the seller’s statements misleading.

Buyers should not assume that every issue will be disclosed voluntarily. A professional home inspection remains an important part of the due diligence process.

Condominium Purchases Require Additional Review

Purchasing a condominium involves more than reviewing the physical unit.

The buyer’s lawyer should carefully examine the condominium corporation’s Status Certificate, which may reveal:

• Pending litigation.
• Special assessments.
• Reserve fund issues.
• Budget concerns.
• Rules restricting pets, rentals, or renovations.
• Outstanding common expense arrears.

Understanding these issues before waiving the Status Certificate condition can help buyers avoid inheriting unexpected financial obligations.

Closing Day Is More Than Signing Documents

Many buyers believe that closing consists only of signing paperwork.

In reality, considerable legal work occurs behind the scenes before ownership can be transferred.

Your real estate lawyer typically:

• Reviews title.
• Searches for registered encumbrances.
• Coordinates mortgage funding.
• Arranges title insurance.
• Calculates financial adjustments.
• Registers the transfer electronically.
• Registers the mortgage.
• Confirms that all closing funds have been received.
• Releases funds once registration is complete.

If legal issues arise before closing, your lawyer works to resolve them while protecting your interests.

What Happens If Someone Cannot Close?

Failure to complete a real estate transaction can have significant legal consequences.

Depending on the circumstances, the defaulting party may be liable for:

• Loss of deposit.
• Additional carrying costs.
• Difference in resale price.
• Legal fees.
• Court proceedings for damages.

Because every situation depends on the specific wording of the APS and the surrounding facts, legal advice should be obtained immediately if a closing is at risk.

How a Real Estate Lawyer Helps

While real estate agents negotiate many business terms of a transaction, real estate lawyers provide legal advice regarding the rights and obligations created by the Agreement of Purchase and Sale.

A lawyer’s role may include:

• Explaining contractual obligations.
• Reviewing schedules and amendments.
• Identifying legal risks.
• Conducting title searches.
• Resolving title defects.
• Coordinating with lenders.
• Preparing closing documents.
• Ensuring funds are properly transferred.
• Completing registration of ownership.

Early legal involvement often allows issues to be identified before they become expensive problems.

Final Thoughts

In Ottawa’s evolving 2026 housing market, success is measured not only by negotiating the right price but also by understanding the legal contract that governs the transaction. The Agreement of Purchase and Sale contains numerous provisions that can affect your financial obligations, legal rights, and ability to complete the transaction smoothly.

Whether you are purchasing your first home, selling a long-time family residence, or investing in real estate, obtaining legal advice before closing can help you understand the agreement, avoid common pitfalls, and protect your interests throughout the transaction.

Disclaimer: This article is provided for general informational purposes only and does not constitute legal advice. Every real estate transaction is unique, and the legal implications of an Agreement of Purchase and Sale will depend on the specific facts and contract terms. You should consult an Ontario real estate lawyer for advice regarding your particular circumstances.