5 Questions to Ask Before Hiring an Arborist in Vancouver

• ISA certification and WCB registration are the two non-negotiable credentials for any arborist in Vancouver — ask for both before signing anything.
• Vancouver's Protection of Trees By-law No. 9958 requires a permit to remove a private-property tree 20 cm or more in diameter, measured 1.4 m above the ground. Fines run from $500 to $10,000 per offence.
• A qualified arborist provides a written risk assessment before work starts. A verbal quote is not an assessment.
• WorkSafeBC calls tree removal inherently high-risk work. Hire a contractor in good standing with WorkSafeBC, or you could be on the hook for their unpaid premiums.
• The cheapest quote often excludes stump grinding, permit fees, and debris removal — line items that change the final invoice.

What Does ISA Certification Mean — and Why Should You Demand It?

The International Society of Arboriculture (ISA) sets the global standard for tree care. To sit the ISA Certified Arborist exam, a candidate needs at least three years of full-time arboriculture experience (or a mix of education and experience). The exam covers 10 knowledge areas, including tree biology, diagnosis, pruning and safe work practices. The credential is valid for three years; to keep it, an arborist retests or earns at least 30 continuing education units in that period.

That's not just a piece of paper. It shows the person in your garden has passed an independent test of tree knowledge, and should know the difference between a co-dominant stem (two large trunks growing from the same point) that needs cabling and a hazard tree that needs removal.

Not every tree service in the Lower Mainland employs a certified arborist.

Ask for the ISA Certified Arborist number. Every certified arborist has one. You can verify it free at treesaregood.org. If the company won't provide a number, that's your answer.

The ISA also offers a Tree Risk Assessment Qualification (TRAQ). It is a separate ISA qualification for formal tree risk assessments. The City of Vancouver asks for an arborist report from an ISA-certified arborist with a removal permit application; TRAQ isn't on the City's list, but it matters when the case for removal rests on hazard. Not every ISA arborist has TRAQ, so ask.

Our team holds ISA certification and the TRAQ designation. We prepare the arborist reports the City of Vancouver asks for with a tree removal permit application. Our arborist reports cover tree risk assessments, development reports and tree protection plans.

Does Your Arborist Know Vancouver's Tree Protection Bylaw — and Will They Pull the Permit?

This question quickly separates careful operators from the rest.

The City of Vancouver's Protection of Trees By-law (No. 9958) requires a permit to remove a private-property tree that is 20 centimetres or more in diameter, measured 1.4 metres above the ground. Trees with several stems count if the combined diameter of the largest two or three stems reaches 20 cm. That takes in many mature backyard maples, cedars, Douglas firs and fruit trees.

Removing a protected tree without a permit is illegal. On conviction, the by-law sets a fine of $500 to $10,000 for each offence, and each tree counts as a separate offence.

The City may require replacement trees. How many depends on the number of trees approved for removal and the number of other trees on the site.

A legitimate arborist tells you this upfront. They assess whether your tree triggers the bylaw. If it does, they apply for the permit or prepare your documentation.

If an arborist says "don't worry about permits" — walk away. That's not professionalism. It's exposing you to a fine of up to $10,000 per tree.

For a non-development site, the Vancouver permit process involves:

• An arborist report prepared by an ISA-certified arborist, plus a site plan showing buildings, streets or lanes and any replacement trees
• A reason the by-law accepts, such as the tree being dead, dying, diseased or hazardous, causing serious damage to the property, or sitting inside an approved building envelope
• Permit fees, replacement planting where required, and removal within six months of the permit being issued

Our team handles all bylaw documentation and permit applications as part of our tree removal service in Vancouver. Most homeowners have never applied for a tree permit before.

Burnaby, North Vancouver, Coquitlam, and Richmond each have their own tree protection bylaws. These bylaws have different size requirements and processes. An arborist working across the Lower Mainland should know all of them.

Is Your Arborist WCB Registered — and Does That Actually Protect You?

WorkSafeBC (WCB) coverage is the first document to ask for. A tree service with a crew should be able to show it is registered and paid up.

Most homeowners don't know this: if you hire a contractor who isn't in good standing with WorkSafeBC, you could be held jointly liable for their unpaid insurance premiums for the time they worked for you.

WorkSafeBC's advice to homeowners is to get a clearance letter for each contractor. The letter confirms the contractor is in good standing, and it protects you from liability for premiums they don't pay. It does not rate their safety record or the quality of their work.

WorkSafeBC describes tree removal as inherently high-risk work, with more risk when a tree is dead or decaying, larger, or in a tight work area (WorkSafe Bulletin WS 2023-06). To fall a tree more than 15 cm in diameter, measured 30 cm from the base, a worker must be certified to the BC Faller Training Standard.

Confirming WCB coverage is straightforward. Before work begins, get a clearance letter from WorkSafeBC. It's free, you can request it online at worksafebc.com, and it should be addressed to you. A legitimate arborist service provides this documentation without hesitation.

Aesthetic Tree & Hedge Services is WCB registered. We carry $3M in liability insurance. Certificates of insurance and WorkSafeBC compliance are available on request before any work begins.

What Should a Proper Arborist Assessment Cover Before Work Starts?

A verbal quote from someone with a truck is not an arborist assessment.

A proper pre-work evaluation follows the ANSI A300 standards, the American National Standards for tree care operations, including Part 1 on pruning.

For a standard pruning or removal, the assessment should cover:

Species identification. A Douglas fir has different pruning requirements than a Western Red Cedar. A Big-leaf maple in decline behaves differently than a healthy one. Species determines timing, cut placement, and root management.

Root flare inspection. The root flare is where the trunk meets the root system, typically at or near ground level. Soil piled against the root flare causes decay over time. An arborist who doesn't mention it probably isn't examining it.

Structural defects. Co-dominant stems, included bark, cavities, cracks, and dead wood are all failure points. These must be documented before any pruning or removal begins.

Risk rating. If the tree poses a hazard — to your roof, fence, power lines, or a neighboring property — the arborist assigns a formal risk rating. The ISA's Tree Risk Assessment method weighs how likely the tree is to fail and how much damage it could cause, then produces a defensible result.

Written scope of work. Every job needs a written scope before the first cut. "We'll clean it up" is not a scope. "Remove all deadwood, maintain natural crown form, all cuts per ANSI A300 Part 1" is a scope.

For larger removals, a formal written arborist report may be required — especially for City of Vancouver permits. The City requires that report to be prepared by an ISA-certified arborist and submitted with the permit application.

How Do You Spot an Arborist Quote That's Missing Critical Work?

The cheapest quote is rarely complete.

Here are the line items most low-cost operators leave out:

Stump grinding. A removal quote that excludes stump grinding leaves you with a stump that, depending on the species, may re-sprout and will slowly decay. Ask directly: does this quote include stump grinding down to ground level? Clarify before signing.

Debris removal. Felling a large tree generates a lot of material — wood, bark, and chips. Ask whether removal and disposal is included or billed separately.

Permit fees. City of Vancouver tree removal permits cost $113 for the first tree and $324 for each additional tree in the same 12-month period. Confirm whether they're in the quote or not.

Access equipment. Cranes, boom lifts, and bucket lifts add cost to complex jobs. If the tree overhangs a structure or sits on a tight urban lot, access equipment is often required for safe removal. A quote that ignores access on a confined-space job is hiding that cost.

Root excavation. For stump grinding adjacent to a foundation, retaining wall, or utility line, hand digging around the root zone may be required first. This is skilled work that takes time and adds cost.

Compare quotes line by line. Don't compare totals.

Which Vancouver Tree Species Require Specialist Arborist Knowledge?

Not every species responds the same way to pruning, removal, or disease. In the Lower Mainland, several native and introduced species demand specific expertise.

Douglas fir (Pseudotsuga menziesii). The dominant conifer in BC's coastal forests. Douglas firs can grow enormous in residential settings. Their root systems extend well beyond the outer edge of the branches. Felling requires careful assessment of the root system at the base and the direction the tree leans. After pruning, wounds must be managed — Douglas fir is susceptible to decay fungi when wound closure is slow.

Big-leaf maple (Acer macrophyllum). A large native hardwood found across the Lower Mainland. Big-leaf maples grow fast and form large, spreading crowns. They're prone to co-dominant stems — two or more large-diameter trunks competing from a single root collar. Co-dominant stems under stress can split suddenly at the union. An arborist assesses these unions and recommends cabling, removing the weaker trunk, or removal based on failure risk.

Western Red Cedar (Thuja plicata). The provincial tree of BC. Cedar is a popular hedge choice across Metro Vancouver, and cedars don't tolerate hard-cutting into brown wood. Over-trimming — removing too much of the green growing zone — causes permanent browning. Timing matters: cutting cedar too late or too aggressively leaves less time for recovery before winter, causing damage that may not show until the following spring.

Ornamental cherry (Prunus serrulata and related species). Vancouver is famous for its cherry blossoms. Ornamental cherries are susceptible to bacterial canker (Pseudomonas syringae) and silver leaf disease (Chondrostereum purpureum). Pruning wounds are the main entry point for silver leaf spores. The Royal Horticultural Society advises pruning susceptible Prunus in summer, when there are fewer spores and wounds heal more quickly.

Garry oak (Quercus garryana). Garry oak ecosystems are among the most endangered in Canada: less than 5% of the original habitat remains in near-natural condition, and about 100 species in them are listed as at risk (Garry Oak Ecosystems Recovery Team). If you have one, check local rules before any pruning or removal.

This species knowledge isn't extra. It's the foundation of competent arborist work in Vancouver's urban forest.

What Happens When Tree Work Goes Wrong in Vancouver?

In a dense urban environment, tree work failures have expensive consequences.

A poorly executed removal can damage a neighboring fence, a parked car, or a roof. Careless work can also damage roots. In southern BC, Douglas-fir is highly susceptible to Armillaria root disease, which spreads between trees through root contact (Province of British Columbia).

Improper hedge trimming permanently damages conifer hedges. Cutting cedar back past the green growth leaves brown patches that rarely fill in. Our hedge trimming service in Vancouver times each cut to the hedge species.

When things go wrong, liability falls to:

• The arborist's liability insurance (which legitimate operators carry)
• WorkSafeBC coverage (for on-site worker injuries)
• The property owner (if neither applies — the scenario to avoid at all costs)

Storm emergencies — a downed tree on a roof, a trunk blocking a driveway — demand immediate professional response. Compromised wood, buried tension, and shifting root plates make amateur handling genuinely dangerous. Our emergency tree service operates with WCB registration and full liability coverage for exactly these situations.

Work errors also create secondary hazards. One bad removal — a trunk left too high, a root system severed without assessment — can destabilize a nearby tree. That tree may fall months later without warning.

What Does a Certified Arborist Do That a General Tree Service Doesn't?

The terms "arborist" and "tree service" appear interchangeably in advertising. They are not the same.

A tree service may employ skilled workers who operate chainsaws. Many do solid work. But an ISA Certified Arborist brings professional credentials in tree biology, risk assessment, and care standards that a general service often can't match.

In practice, that difference means:

• An arborist identifies early-stage disease in a Big-leaf maple and recommends intervention before removal becomes necessary.
• An arborist knows which pruning cuts build a stronger tree structure — and which ones lead to rot and decay.
• An ISA-certified arborist prepares the arborist report the City of Vancouver requires with a tree removal permit application.
• An arborist advises on species selection for replanting. Putting the right tree in the right place is a stated aim of Vancouver's 2025 Urban Forest Strategy update.

The City of Vancouver reports that its tree canopy has grown to 25% city-wide since 2013, and its updated Urban Forest Strategy (2025) sets a goal of 30% by 2050 across public and private land. Decisions made by individual homeowners — to remove, prune, or replant — collectively shape that tree cover over decades.

An arborist understands this. A removal crew sees a job. The distinction matters most for complex work — tree cutting in Vancouver over structures, managing multi-stem trees near power lines, or pruning old or historic trees.

How Do You Verify an Arborist's Credentials Before Committing?

Verification is simple.

ISA Certified Arborist directory. The ISA maintains a public lookup at treesaregood.org. Search the directory to confirm the arborist holds a current credential.

WorkSafeBC clearance. Get a free clearance letter from WorkSafeBC online at worksafebc.com, addressed to you, before work begins.

City of Vancouver tree removal permit. When a permitted tree comes down, the permit must be posted where it can be seen from the street or lane while work is underway. Ask to see it. You can report a suspected unauthorized removal to the City.

Certificate of insurance. Ask for a certificate of insurance before work starts. Strata councils and commercial property managers ask for one before approving a vendor, and homeowners can ask too.

These aren't bureaucratic formalities. They're the checks that separate a qualified arborist from someone who bought a chainsaw and a truck. For a free estimate from ISA-certified, WCB-covered arborists, call Aesthetic Tree & Hedge Services at (604) 721-7370.

Test Your Knowledge

1. How long is an ISA Certified Arborist credential valid before it must be renewed?

• A. Every year
• B. Every several years
• ✅ C. Every three years
• D. Every five years

*The credential is valid for three years. To renew, an arborist retests or earns at least 30 continuing education units in that period.*

2. At what trunk diameter does a private-property tree need a removal permit under Vancouver's Protection of Trees By-law No. 9958?

• A. 15 centimetres
• ✅ B. 20 centimetres
• C. 25 centimetres
• D. 30 centimetres

*A permit is needed for trees 20 centimetres or more in diameter, measured 1.4 metres above the ground.*

3. Where can homeowners verify that an arborist's ISA certification number is authentic?

Homeowners can verify an ISA Certified Arborist number for free at treesaregood.org.

4. What could a homeowner be liable for after hiring a contractor who isn't in good standing with WorkSafeBC?

Unpaid WorkSafeBC insurance premiums for the period the contractor worked for them. A clearance letter addressed to the homeowner protects against this.