Buying a Home With Mature Trees? Here’s What to Check Before You Close

Mature trees are a real selling feature. A big spruce or a large shade tree in the backyard makes a property look established and livable in a way that a brand new build never does. Real estate listings point them out. Buyers often pay more for properties that have them.

What buyers rarely do is have those trees checked out before closing.

This gap costs people money. A mature tree that looks healthy from the ground can have serious structural problems that only become clear to someone who knows what to look for. Getting a tree inspection before you finalize a home purchase is not standard practice in Calgary, but it really should be.

Why Mature Trees Deserve More Attention Than They Get

A 30-year-old spruce or a large elm is not just a landscape feature. Depending on its condition, it is either a real asset or a serious liability. A healthy mature tree adds value. A structurally compromised mature tree is a future removal job, and tree removal at that size in Calgary costs thousands of dollars.

The problem is that most buyers look at a large tree and see only the benefit. The assessment happens in a glance from the ground during a showing, with no professional evaluation of what is actually going on inside that tree.

Compare that to the attention paid to the furnace, the roof and the foundation. Those get inspected. Trees, which can cost as much to remove as some of those repairs, typically do not.

What to Look For Yourself

Before you bring in a professional, there are things you can spot during your walkthrough that tell you whether a tree needs closer attention.

Cracks or splits in the trunk or major branches. Any visible crack in the wood, especially a vertical crack or one that goes deep into the wood rather than just on the surface, is a structural concern. A tree with a crack in a major limb is a tree with a branch that could come down.

Leaning. A tree leaning toward the house, a fence or any structure deserves a closer look. Not all leaning trees are dangerous. Some have leaned for years and their roots have adapted. But a tree that seems to have shifted its lean recently, with soil cracking or heaving at the base, is worth getting evaluated.

Dead branches. Dead branches are visible even from the ground. They have no leaves in summer. The bark may be peeling off. They tend to look grey-brown rather than the normal grey-green of living bark. Some dead branches in a tree are normal. Large dead branches, especially high up in the canopy, are a concern.

Damage at the base. Look at where the trunk meets the ground. Soft spots, mushrooms or fungal growth at the base of the trunk, loose bark or holes in the lower trunk all point to decay. Decay at the base can extend into the root system or deep into the trunk.

Multiple stems growing from the same point. A tree with two or three main stems coming from a single junction is more vulnerable than one with a single straight trunk. The spots where those stems meet can trap bark between them as the tree grows, creating a structural weakness that gets worse over time. In a heavy wind or snow event, these trees can split right at that junction.

Roots pushing up nearby pavement. If you can see roots lifting a nearby sidewalk, driveway or patio, the root system is aggressive and close to the surface. That tells you something about how the tree is going to behave near any buried infrastructure on the property.

Getting a Professional Assessment

If any of the above raises a flag, or if the property has large mature trees in positions where their failure would hit the house, the garage or a big chunk of the landscaping, a professional tree risk assessment is worth the cost.

An ISA-certified arborist can assess the tree for structural problems, estimate its overall health and give you a realistic picture of what needs to be done. The assessment might come back clean. Or it might tell you that two of the three trees on the property need to come down within the next few years, which changes the economics of the purchase.

The cost of a professional tree assessment is typically a few hundred dollars per property. Relative to the price of a house, that is a small number. Relative to the cost of removing a large tree after you own it, also a small number.

Trees Near the House Are the Biggest Concern

The highest-risk scenario is a large tree close to the house. If a tree is within falling distance of the structure and has structural problems, the worst case is serious. Even without a full failure, trees too close to a house create ongoing problems: branches rubbing on the roof, roots pushing toward the foundation, heavy shade creating moisture and moss problems on the shingles.

When you are looking at a property, think about where each large tree would fall if it came down. If the answer is “on the house” or “on the garage,” that tree deserves a close look.

Sewer Lines and Tree Roots

Ask about the condition of the sewer line and the water main. On properties with mature trees, root intrusion into sewer lines is fairly common, especially with species like willows, poplars and silver maples. A sewer scope inspection, which involves running a camera through the sewer line, can tell you whether roots have gotten in.

Sewer line repair or replacement is expensive. If there are aggressive-rooted trees on the property, a sewer scope is cheap insurance before you buy.

What Happens After You Buy

If you buy a property and then discover tree problems, you now own both the problem and the solution.

Before removing a mature tree on a property you just bought, check whether the City of Calgary’s tree protection rules apply. Depending on the tree’s size, species and location, a removal permit may be required. This is not a reason to avoid removing a dangerous tree, but it is a reason to understand the process first.

Also worth knowing: removal is not always the only option. Trees with structural issues can sometimes be stabilized through cabling and bracing. Trees damaged by storms or bad pruning can sometimes recover. An arborist can tell you what the realistic options are and what each would cost.

The Bottom Line

Mature trees are worth having on a property. They provide shade, privacy, a home for birds and real visual value. But they deserve the same level of scrutiny as any other significant part of a property you are buying.

Home inspectors have detailed checklists for roofs, furnaces, plumbing and electrical. Trees have not been included in that process the same way, which means buyers often close on properties without knowing what they have gotten into.

Spending a few hundred dollars on a pre-purchase tree assessment is a reasonable way to fix that gap. At the very least, look at the trees carefully during your walkthrough and ask questions about any that concern you. Getting a credit for a problem tree during a negotiation is a lot easier than paying for its removal after you already own the property.