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Elm Tree Roots and Driveway Project #946010

Asked September 28, 2026, 3:10 PM EDT

Greetings, We are building a new detached garage which will require our driveway to be expanded over a section of open earth that includes prominent, Elm Tree roots from a mature 75 year old tree. Our question is.. how close to the roots can the new concrete can be poured and whether any of the roots can be cut/removed without damaging the health of the tree. The Driveway view picture shows the open space near the fence, the Elm Roots picture shows two prominent 'knobs' of root which have grown above ground level. The ground perspective photo shows that the current root knobs are about 1 to 3 inches above the surface level of the existing concrete. If you have experience with this type of situation or would recommend someone who does, I would appreciate the input. Ideally the new concrete will be 4 inches deep and we would like to establish a perimeter around the roots if that is required. Thank you,

Hennepin County Minnesota

Expert Response

Your question is timely because it's essential to devise a plan to protect tree roots from construction/excavation damage before the project begins. The following publication explains why and how to do that.  

https://conservancy.umn.edu/server/api/core/bitstreams/f2c20578-3ea0-4afd-836d-91a9fceaf8fa/content

Based upon what you have said, and the high value of the tree in question, we recommend hiring a certified arborist to devise a plan to protect it.  Some tree care companies specialize in providing this kind of service.  

This information may be useful if you decide to hire a tree care professional:

https://extension.umn.edu/garden-and-home/yard-and-garden/gardening-in-minnesota/how-to-hire-a-tree-care-professional
An Ask Extension Expert Replied September 28, 2026, 4:17 PM EDT

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