Interlocking Stone vs. Concrete Patio: What's Better for London Ontario Homes?

Hardscaping · 6 min read

When London homeowners plan a patio or walkway, the choice usually comes down to two options: interlocking paving stone or a poured concrete slab. Both can look great, but they age very differently in our freeze-thaw climate. Here's an honest comparison to help you decide.

Appearance and Design

Interlocking stone wins on flexibility. It comes in countless colours, shapes and patterns, lets you create curves, borders and inlays, and gives a high-end, custom look. Poured concrete is more uniform — clean and modern, and it can be stamped or coloured, but the design range is narrower. If curb appeal and a distinctive look matter most, interlock usually has the edge.

Durability in Our Freeze-Thaw Climate

This is where London's winters really separate the two. A large concrete slab is rigid, so when the ground heaves and shifts through repeated freeze-thaw cycles, the slab tends to crack — and a cracked slab is hard and expensive to fix invisibly. Interlocking stone is made of many small units sitting on a flexible base, so it moves with the ground instead of fighting it. Properly installed interlock resists cracking far better in our climate, which is a big reason we recommend it for most patios here.

Repairs

If a concrete slab cracks or a corner spalls, repair usually means patching (visible) or replacing a whole section. With interlock, if a stone gets stained or damaged, you simply lift it out and drop in a replacement — the repair is nearly invisible and inexpensive. For long-term maintenance, interlock is much more forgiving.

Cost

Upfront, a basic poured concrete slab is often cheaper than quality interlock, because interlock is labour-intensive — the base prep and hand-laying take time. But the calculation changes over the life of the patio. Concrete that cracks and needs replacing can cost more in the long run, while well-installed interlock can last decades with minimal upkeep. Think total cost of ownership, not just the install price.

The Base Is Everything

Whichever you choose, the install quality matters more than the material. Interlock laid on a poor base will settle and shift; concrete poured without proper sub-base prep will crack early. A proper job means excavation to the right depth, a compacted granular base, and correct edge restraint and drainage. That's the difference between a patio that looks great for twenty years and one that's a mess in five. Learn more on our hardscaping page.

Our Take for London

For most London patios and walkways, we lean toward interlocking stone — it handles our freeze-thaw cycles better, repairs easily, and offers a premium look. Concrete still has its place for certain budgets and modern designs. The best move is to get a free quote on both and weigh the numbers against how long you plan to enjoy the space. If you're also adding a deck or refreshing beds with landscaping, we can design it all to work together.