If the house you like has a wood foundation, the question to answer is whether it’s been kept dry. Most of the horror stories come from ones that weren’t. A good inspector can tell you which kind you’re standing in, and that’s where we’d start before writing an offer.
Art and I have sold a few of these over the years. To write this, we also pulled every detached home with a wood foundation that sold in Calgary over the last two years, so the numbers below come from real sales.
The quick version
- What it is: basement walls built from pressure-treated lumber and plywood where most houses have poured concrete. It has its own national building standard.
- How common: not very. Roughly seven or eight sell in Calgary each month (MLS sales data via Pillar 9, September 2026).
- When and where: mostly built between 1978 and 1992. MacEwan Glen and Scenic Acres lead the city, and Hillhurst and Killarney lead the inner city.
- The main risk: water sitting against the walls, which over time can lead to rot or bowing.
- Before you offer: an inspection with someone who has seen wood foundations before, plus a quick check with your broker and your insurer.
- Who they suit: buyers who want to understand the house and will keep up with it.
What a wood foundation is
A wood foundation, often called a PWF (preserved wood foundation), uses pressure-treated lumber and plywood for the basement walls. The basement floor is often still concrete. It’s an accepted system under Part 9 of the National Building Code of Canada, with its own design standard, CSA S406, and a separate standard for how the wood is treated, CSA O322.
The Canadian Wood Council says the first ones in Canada went in around 1950 and are still in use. They promote the product, so weigh that, but it’s a long track record.
Wood handles water differently than concrete does. Keep it dry and it lasts. When water sits against it year after year, usually from grading that slopes toward the house or a downspout emptying at the wall, it can rot or start to bow inward, and fixing that is a big job. That’s where the reputation comes from, and it’s why the inspection matters more on these houses than on most.
Where you’ll find wood foundations in Calgary
They turn up in more neighbourhoods than people expect, just not often. Over the last two years, 173 detached homes with a wood foundation sold across the city. For scale, Calgary recorded 896 detached sales in September 2026 alone (CREB, as of September 2026).
Three quarters of those 173 were built between 1978 and 1992. Across the city, MacEwan Glen and Scenic Acres had the most sales, followed by Millrise, Bowness, Vista Heights and Woodbine. In the inner city, 53 sold, with Hillhurst, Killarney and South Calgary at the top and Richmond, Tuxedo Park, Parkhill and West Hillhurst close behind.
How you usually find out
In the basement, and usually by surprise. A few years ago, a house in West Hillhurst came up on a client’s search priced well under everything else they’d been watching. We ran out to see it. Upstairs, nothing looked different. It was only in the mechanical room, where the walls weren’t finished, that we saw the big wood beams where we’d expect concrete.
Our clients did what most people do. They started thinking out loud about wood being porous and whether the basement would always feel a bit damp. Those are fair questions, and an inspector can answer both.
A finished basement hides a wood foundation completely, and a listing won’t always make it obvious. If a house looks oddly cheap for its street, ask your agent to check the property history before you go. It’s usually recorded there.
The inspection is how you find out what you’re getting into
Book an inspector who has seen wood foundations before, and tell them up front what the house has so they plan the time. We work with Ryan Davidson at House to Home Inspections, and he’s who we’d call.
Inside, they’re looking for damp, staining, a musty smell and any bowing in the walls. Outside, they’re checking whether the ground slopes away from the house, where the downspouts empty, and where the water goes in a heavy rain. While they’re there, ask them what upkeep this particular foundation needs. Their answer tells you what you’re signing up for.
If they see something they don’t like, the next step is a letter from a structural engineer. Leave enough time in your inspection condition to get one. Our Calgary home inspection guide covers the rest of the inspection, from roofs to mold.
It’s also worth a quick call to your mortgage broker and your insurer early in your condition period. Some lenders and insurers treat wood foundations differently, and a few will want an engineer’s letter or other paperwork before they say yes. A broker is a better call than a single bank, because they know which lenders are comfortable with them.
Who a wood foundation house suits
It suits someone who wants to understand the house they’re buying and will look after it. That means checking the grading every spring, keeping the downspouts extended, and dealing with a damp corner the week you notice it. In our experience, buyers who like a deal or a project are the best fit.
If you aren’t looking to fully understand it and maintain it properly, buy the concrete one. We’ve had clients walk through a wood foundation that inspected well and still decide it wasn’t for them, and that’s a perfectly good call.
Concrete isn’t trouble-free either. It cracks and settles, and water finds its way through it too, which is why we treat every foundation the same way at inspection. There’s no perfect foundation.
Is the lower price worth it?
They usually sell for less than a similar house with a concrete foundation, because fewer buyers will look at one. That works in your favour when you buy. You’ll meet the same thing when you sell, so the price you pay needs to leave room for it.
We won’t put a single number on the gap, because it moves with the house and the condition of the foundation. What we can do is pull the comparable sales for the house you’re looking at, so you know what a fair price looks like before you offer.
Frequently asked questions about wood foundation houses in Calgary
No. Most of the problems come from wood foundations that weren’t kept dry. Have it inspected by someone who has seen them before, check with your broker and insurer, and decide once you know what you’re looking at.
Often you can’t tell from the listing, and a finished basement hides the walls. The mechanical room usually shows wood where you’d expect concrete, and the property history usually records it. A build date between 1978 and 1992 is the first clue.
It depends on the lender. Some are comfortable with them and some aren’t, and a few will want an engineer’s letter first. A mortgage broker can tell you which is which. Get the answer before your financing condition ends.
The building standard treats a properly built and drained one as permanent, and the first Canadian examples date to around 1950. In practice, the ones that last are the ones that were kept dry.
If you’re weighing one now, send us the listing. We’ll pull the comparable sales and tell you what we’d want to know before you write an offer.