Construction on neighboring lots can pose risks to your trees, especially to their roots. Root damage is often the most overlooked yet impactful consequence of construction. Since tree roots often extend beyond property lines, nearby construction may cause some level of root disturbance; however, trees can typically tolerate limited impacts without long-term decline.
Understanding the scope of the project is crucial for identifying potential risks to your trees. Request a copy of the approved construction plan from your neighbor or the project developer. Copies of the approved construction plan can also be obtained through the LDS FOIA Office. Early communication allows you to anticipate impacts and explore ways to minimize damage to your trees.
A construction plan typically includes several key components:
In Northern Virginia, most tree roots grow within the top 24-inches of soil and can extend far beyond the trunk. To estimate the spread of your tree’s critical roots, measure the trunk's diameter (in inches) and use that number as feet.
For example:
This area is called the “Critical Root Zone” (CRZ). This is where the roots are most vulnerable to damage. Construction too close to the CRZ can cause serious, often permanent damage.
If construction impacts more than 40% of a tree’s Critical Root Zone (CRZ), the tree may not survive. Work with a private arborist certified by the International Society for Arboriculture (ISA) or a consultant from the American Society of Consulting Arborists (ASCA). These professionals can help with pre-construction planning and recommend solutions such as:
Find certified arborists through these resources:
Mature trees improve property value and contribute to the local ecosystem. If construction may impact nearby trees, talk with your neighbor about the benefits of preserving them.
Helpful resources to support your conversation:
If your tree has already been damaged by nearby construction, consider these steps to support its recovery:
For expert guidance, contact the Fairfax County Virginia Cooperative Extension Office.
Additional resources:
By working collaboratively with your neighbor and taking the right steps, you can help preserve the health and longevity of your trees during nearby construction.
Fairfax County prioritizes tree preservation and strives to protect trees, in accordance with the Tree Conservation Ordinance (Chapter 122 of the County Code). Additional requirements related to tree conservation are outlined in Chapter 12 of the Public Facilities Manual. The Forest Conservation Branch reviews each project to help ensure trees are preserved whenever possible, based on the permitted use of the site.
If you're concerned about how nearby development affects trees after a plan is approved, please note that these are considered civil matters and should be resolved directly between the affected property owners.In Fairfax County, the review process includes several key evaluations for trees:
For details on permitted construction hours or to file a noise complaint, refer to the Fairfax County Noise Ordinance or submit a complaint with the Department of Code Compliance.
Whenever possible, motorized construction equipment should be parked within the approved Limits of Disturbance (LOD).
Construction site operators are responsible for controlling the transport of dust and other wind-born contaminants caused by land-disturbance, demolition and other construction activities. This includes:
All dumpsters associated with a construction project must be kept on site and within the limits of clearing and disturbance.
Acceptable control methods include:
Need Help? Call 703-222-0801, TTY 711.
Monday through Thursday from 8 a.m. to 4 p.m. and Friday from 9:15 a.m. to 4 p.m.
