How to Identify and Protect Important Trees Before Construction Starts
Planning Projects with Trees in Mind
Trees are beautiful—but they can bring challenges to your project. Mismanagement of trees can delay permits, trigger redesigns, or upset communities. The key to avoiding these risks? Involve a certified arborist early, before plans are finalized.
Trees shouldn’t derail your project, and with the proper planning, they won’t. Our arborists are here to support your project from start to completion.
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Why Trees Matter & Why Early Action is Essential
It’s common knowledge that trees are treasured here in the Pacific Northwest. They are present in our everyday environments and are critical to carbon sequestration and improving our air and soils. Of course, there’s also the added benefit of increased property values, shade, and aesthetic appeal. Trees aren’t just “nice-to-have”; they’re a priority to our communities—especially as urban development continues to push further into forested areas.
Jurisdictions everywhere are updating their tree codes to reflect these community values and are tightening requirements. With so many different stakeholders and requirements, preserving trees responsibly is increasingly tied to project success.
You Can’t Replace a Mature Tree
One of the most important things to understand is that mature trees can’t be replaced in kind. A beautiful 50-inch Douglas-fir providing shade in someone’s backyard can’t be replaced by simply planting a new one.
And it’s not just about the monetary value. Some tree values are irreplaceable—shade, privacy, history, and even the emotional connections communities have with certain trees are all benefits worth protecting.
That’s why it’s so important to recognize and factor in tree value early in project planning.
Understanding Tree Biology
Protecting the Root Zone
One common misconception is that trees have a single deep root; if you avoid that, you’re fine. But that’s not how it works. Tree roots are wide and shallow, typically within the top 24 inches of soil. The bigger the tree, the larger the root zone. The general rule of thumb is 1 foot of root zone radius per inch of trunk diameter at breast height (DBH). So, a 24-inch DBH tree could have roots extending 24 feet or more.
We’re only excavating 6 inches, so we shouldn’t hit the roots, right? No, even shallow work can damage a massive portion of the tree’s root system. Successful tree preservation shouldn’t wait until construction. A lot of work goes into getting to the construction phase of a project, and many decisions have already been made at that point. If tree concerns wait until that phase to be addressed, it takes a lot more time and money to fix. A phone call to our arborist team to request observation the day before excavation is too late.
Why Construction Impacts Last a Lifetime
Trees don’t heal like we do; they compartmentalize, and injuries have a cumulative impact. When a tree is injured, it walls off the damaged area to keep decay from spreading. The injury never actually heals, and the impacts stay with that tree for life. This means that any digging, pruning, compacting soil, nicking a trunk, or anything else that happens during a project has a long-term effect on a tree’s health. All of it adds up and can ultimately lead to tree failure.
The Compartmentalization of Decay in Trees (or CODIT) refers to the process trees use to defend themselves against decay by forming four “walls” around the injury to prevent it from spreading. Some species are better at this than others, depending on their vigor, health, and genetics. But even then, it’s important to remember that the tree is just managing the damage, not reversing it.
Can’t you just cut the damage out, like removing a tumor? Unfortunately, no. That would only create new wounds. You’re damaging more cells, and the tree must start compartmentalizing again. This becomes a cycle that can weaken the tree over time.
These kinds of impacts don’t always show up right away. A tree might look fine for a year or two after construction, but internal damage may already be setting the stage for the tree’s final decline.
Beware of Products that “Fix” a Tree
Any product promising to “repair” a tree is all snake oil. There are many gimmicks out there—“tree glue,” “healing paint,” even things going so far as calling themselves a “tree Band-Aid.” These products don’t work and most really cause more harm than good by sealing in moisture and promoting decay.
The truth is that trees don’t get better by being patched up. And unlike grafting, you can’t just fix a damaged tree by trying to fuse it back together.
The best method against tree damage is preventing it in the first place. And that’s why we can’t say it enough—recruit a certified arborist onto your project as early as possible. A tree simply cannot recover from poor planning.
Tree Protection Planning Starts Early
Protecting trees during development isn’t about reacting—it’s about planning. Our certified arborists follow a four-phase process that aligns with your project’s lifecycle, starting before the first sketch and continuing well after construction wraps up.
While every project differs, we’ve outlined what arborist support typically looks like across five typical project phases. Whether we’re brought in at the start or later in the process, our goal is the same: help you make informed decisions that protect valuable trees and keep your project moving forward.
Here’s a quick overview:
- Phase 1: Feasibility – Understand early risks and opportunities to control the narrative and reduce surprises.
- Phase 2: Planning – Identify valuable trees and explore options early.
- Phase 3: Design – Refine plans and finalize protection strategies.
- Phase 4: Construction– Ensure preservation practices are followed and protect trees during the most disruptive phase of your project.
- Phase 5: Post-Construction – Evaluate final conditions and catch issues early.
🌲Want to dive deeper into how arborists support each of these phases?
Final Thoughts
Trees don’t have to be an afterthought in your projects. When you take the time to integrate them into your project during the planning phase, they can strengthen your project’s design, earn community support, and ensure long-term success.
Protecting trees doesn’t have to be a burden—it just has to be part of the plan.
Questions about trees located on your project? Our Certified Arborists are ready to help!