Renovating an older home in Montreal offers charm, value, and history—but it also comes with hidden risks, especially when it comes to the foundation. Many heritage and century-old homes were built before modern building codes and drainage systems were in place, making them vulnerable to foundation cracks, water infiltration, and structural settling.

Whether you’re upgrading the basement, adding an extension, or renovating the interior, it’s vital to take foundation health into account. Here are the top 5 renovation tips to preserve your home’s foundation integrity during remodeling.

1. Schedule a Foundation Inspection Before Renovations Begin

Before you start knocking down walls or planning a basement suite, book a foundation inspection with a specialist. Older homes often have hidden foundation issues like hairline cracks, shifting footings, or water damage that may worsen during renovations.

Learn what to expect during a foundation repair inspection here:
What to Expect During a Foundation Repair Inspection

2. Reinforce or Waterproof the Basement Before Finishing It

If you’re planning to finish your basement or build a rental unit, make sure your foundation is fully waterproofed and structurally sound. Older Montreal homes are prone to basement leaks due to hydrostatic pressure and aging construction.

Consider installing interior drain systems or French drains around the perimeter.

Explore professional waterproofing solutions:
Protect Your Home With Professional Interior Drain Solutions
The Importance of French Drains in Preventing Basement Water Damage

3. Watch for Foundation Settling When Altering Floor Plans

Removing load-bearing walls, adding large windows, or building an extension can shift the weight distribution of your home. This often leads to foundation settling or cracks, especially if the soil underneath is unstable.

Before making major changes, consult a structural engineer and foundation expert to prevent long-term damage.

Understand the difference between settling and cracks:
Foundation Settling vs. Foundation Cracks – What’s the Difference?

4. Improve Drainage and Grading Around Your Home

Poor exterior drainage is one of the biggest threats to older foundations. Make sure gutters, downspouts, and grading direct water away from the foundation.

A poorly designed landscaping layout can lead to water pooling near the base of your home, accelerating wear and increasing the risk of basement flooding.

Tips on landscaping and drainage protection:
The Role of Landscaping in Foundation Protection

5. Choose Renovation Materials That Don’t Overload Your Foundation

Old foundations were not designed to support modern building materials like concrete countertops, steel beams, or multi-level extensions. Overloading the structure can create stress fractures in the foundation over time.

During renovations, opt for lightweight materials when possible, and consult with experts if you plan to increase the load on any part of the home.

Read more about identifying structural red flags:
10 Common Signs Your Home May Have Foundation Problems

Conclusion: Renovate Smart, Protect Your Foundation

Renovating an older Montreal home is exciting, but it’s essential to renovate safely and strategically. Taking the proper foundation-friendly steps during upgrades not only protects your investment, but also ensures your home stands strong for generations to come.

Need Help with Foundation Protection During Renovations?

At Marco Réparation de Fondation, we specialize in protecting and repairing foundations in older and heritage homes across Montreal. From inspections to waterproofing, we’re here to help you renovate with confidence.

Contact Us for a Foundation Consultation