How close can construction get to a tree before it is a problem?

The usual rule of thumb is a protection radius of about one foot for every inch of trunk diameter, but it varies with species, age, soil and which side the roots are on. The only way to know for your tree is to have it looked at before the plans are fixed.

My tree started declining two years after we built an addition. Is that related?

Very possibly. Construction damage characteristically shows in the canopy two to four years later, which is exactly why it gets missed. Severed roots, compacted soil and grade change are the usual causes, and some of it can be mitigated even at that point.

Can soil compaction be reversed?

Partly. Compacted soil within the root zone can be decompressed and amended to get air and water moving again, and it does help. It is not as good as not compacting it, which is the argument for planning the machine routes before the machines arrive.

Does Montgomery County require tree protection during construction?

It depends on the jurisdiction and the scale of the disturbance. Rockville, Takoma Park, Gaithersburg and the Town of Chevy Chase all have their own ordinances, and larger disturbances elsewhere in the county can trigger requirements. We will tell you what applies at your address.

Is it worth preserving every tree on a site?

No, and we will say so. A tree already in decline, or one whose root zone the project genuinely cannot avoid, is often better removed and replaced than protected expensively and lost anyway. The judgment is which trees are worth the effort.

Tree Services

Tree Preservation and Construction Protection in MD

Protecting mature trees through construction, regrading and development across Montgomery County. Root zone protection and recovery care — 301-580-6023.

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About Our Tree Preservation Services

Most mature trees that die after building work were not hit by anything. They were killed underground — roots severed by a trench, soil compacted by repeated machine traffic, grade changed by a few inches over the root plate — and the canopy did not show it for three or four years, by which point nobody connected the two.

Tree preservation is the work that prevents that: establishing what root zone a tree actually needs, getting it protected before machines arrive, and treating the damage that could not be avoided. It is far cheaper than replacing an eighty-year-old oak, which cannot really be done at all.

When Homeowners Call Us For Tree Preservation

Building an addition, pool, patio or driveway near a mature tree
Trenching for utilities, irrigation or drainage inside a root zone
Regrading, filling or excavating near established trees
A tree in decline after work was done nearby
Meeting a local tree protection requirement
Wanting a valuable tree assessed before a project starts

Our Process

Assess before anything starts

Which trees are worth preserving, what root zone each needs, and where the project genuinely conflicts with that. This is the step that has to happen first to be worth anything.

Protect the root zone

Fencing at the right radius, routes for machine traffic that avoid it, and agreement on where material can and cannot be stored.

Mitigate what cannot be avoided

Clean root pruning rather than torn roots, soil decompaction, and canopy reduction where root loss has upset the balance.

Monitor through recovery

Construction stress shows up over years, not weeks. Trees are watched through the seasons that follow and treated if they start to decline.

Why Hire Rock Creek for Tree Preservation

ISA Certified Arborist assessment before work begins
Root zone protection specified to arboricultural standards
Coordination with builders, landscapers and utility contractors
Recovery care and monitoring after construction
Honest advice on which trees are realistically worth preserving

Service Area

We provide tree preservation services throughout Montgomery County, Maryland and into Northern Virginia — including Arlington, VA, Aspen Hill, MD, Bethesda, MD, Brookeville, MD, Cabin John, MD, Chevy Chase, MD, Columbia, MD, Damascus, MD and more.

Tree Preservation guides from our team

Tree Preservation Services — common questions

How close can construction get to a tree before it is a problem?: The usual rule of thumb is a protection radius of about one foot for every inch of trunk diameter, but it varies with species, age, soil and which side the roots are on. The only way to know for your tree is to have it looked at before the plans are fixed.
My tree started declining two years after we built an addition. Is that related?: Very possibly. Construction damage characteristically shows in the canopy two to four years later, which is exactly why it gets missed. Severed roots, compacted soil and grade change are the usual causes, and some of it can be mitigated even at that point.
Can soil compaction be reversed?: Partly. Compacted soil within the root zone can be decompressed and amended to get air and water moving again, and it does help. It is not as good as not compacting it, which is the argument for planning the machine routes before the machines arrive.
Does Montgomery County require tree protection during construction?: It depends on the jurisdiction and the scale of the disturbance. Rockville, Takoma Park, Gaithersburg and the Town of Chevy Chase all have their own ordinances, and larger disturbances elsewhere in the county can trigger requirements. We will tell you what applies at your address.
Is it worth preserving every tree on a site?: No, and we will say so. A tree already in decline, or one whose root zone the project genuinely cannot avoid, is often better removed and replaced than protected expensively and lost anyway. The judgment is which trees are worth the effort.

Need tree preservation today?

Call us 24/7 or request a free quote online.