Overview: Arborists & Tree Services
An arborist is the person you call for a judgment about a tree, not for a day of cutting. Will the silver maple over the driveway drop a limb in the next ice storm? Why did the spruce brown out from the bottom up? Did the new basement dig cut too many roots?
The first job is a close look: the base of the trunk, the soil, the forks where big limbs meet, and signs of rot or pests. In Ontario, Arborist is a trade with its own certificate, though holding it is voluntary. Many arborists are also certified by the International Society of Arboriculture. Timing is part of the advice now. The CFIA says not to prune oaks from April to November. Fresh cuts draw beetles that spread oak wilt.
A written report earns its fee when someone else will read it. Toronto usually wants one from an arborist when you apply to injure or remove a protected tree. And under Ontario's Forestry Act, a tree whose trunk grows on the property line belongs to both neighbours.
Our listings show what each arborist states on its own website. Pick a province, then a city, to find tree specialists working around your address.
Frequently asked questions
Who trims branches that are touching the hydro lines?
Not you, and not an ordinary tree crew. Ontario's Electrical Safety Authority tells homeowners to call their local electricity utility or a certified utility arborist. Utility arborist is its own trade in Ontario, trained for work near energized lines. Call the utility first and ask who handles that stretch of wire. Keep your ladder and pole saw well away until someone qualified has looked.
When is a written tree report worth paying for?
When someone else will act on it. Toronto usually wants an arborist report with an application to injure or remove a protected tree, plus a tree protection plan when building near one. Insurers and neighbours take a report seriously when its author isn't bidding on the removal. It also breaks the tie when one company says the tree must go and another says prune it.
Can I cut back a tree that sits on the property line?
Not in a way that could harm it, unless your neighbour agrees. In Ontario, the Forestry Act makes a tree whose trunk grows on the boundary the common property of both owners. Injuring or destroying it without the other owner's consent is an offence. If you're not sure where the line runs, a survey settles it before anyone picks up a saw. Get your neighbour's agreement in writing, and check your city's tree by-law as well.
How do I keep a tree alive through building work?
Protect the roots before the machines arrive, because the damage shows up years later. In Toronto, building near a protected tree needs a tree protection plan, with barriers up before work starts and no construction activity inside the zone. Anywhere in Ontario, request free locates through Ontario One Call before a trench goes in. Where a trench has to cross roots, ask for hand digging or an air spade.
Which qualification should an arborist hold?
In Ontario, look for the provincial Arborist certificate, certification from the International Society of Arboriculture, or both. The law doesn't require either one to run a tree business there, which is why they're worth asking about. Near power lines you want a utility arborist, a separate trade in Ontario. Ask for proof of liability insurance too, since no certificate pays for a limb through your roof.
