How to Remove Tree Roots Under a Driveway Safely
Quick Summary
To remove tree roots under a driveway safely, first call 811 to mark utilities, then expose the root by hand and make one clean cut only if the root is small and far from the trunk. Roots over 4 inches or within 6 to 8 feet of the trunk should be assessed by a certified arborist before any cutting.
Call 811 at least a few business days before digging to mark utility lines.
Roots over about 4 inches across, or within 6 to 8 feet of the trunk, are structural and need an arborist.
Cut roots during the dormant season, from late fall to early spring.
Never remove more than about one-quarter of a tree's root system in a single year.
Install a root barrier at least 18 inches deep, 2 to 4 feet from the trunk.
Table of Contents
Why Tree Roots Lift and Crack Driveways
Tree roots lift and crack driveways because they grow wider and thicker each year. As roots expand, they push upward against the slab. Over time, that pressure heaves the pavement and splits it apart.
Roots from maples, oaks and cottonwoods tend to spread near the surface, where they find moisture and room to grow.
Roots lift pavement in three main ways:
Growth pressure: Thickening roots push the slab up from below.
Moisture seeking: Roots follow water lines and can spread under the driveway edges.
Soil movement: Shifting soil leaves gaps that let the slab settle unevenly.
The damage usually shows up as raised slabs, cracks running across the surface, and edges that sink or tilt. Catching these signs early keeps a small problem from becoming a full replacement.
Assessing the Damage and Locating the Roots
Start by walking the driveway and noting every raised edge, crack and low spot. Mark each area with chalk or flags so you can see the pattern.
Next, look for the roots themselves. Check the soil along the driveway edge and near the tree trunk. A root that enters the soil near the pavement is often the one causing the lift.
Use these simple checks:
Look for root flare: Roots often spread out near the trunk and grow toward the driveway.
Probe the soil: A small hand trowel can reveal roots without damaging them.
Check the crack pattern: Cracks that run toward the tree usually point to root activity.
Watch out: Do not dig deep holes next to the tree without knowing where the roots run. Deep digging can damage the tree and cause injury if you hit a utility line.
Deciding Whether to Cut, Prune, or Leave the Root
Not every root should be cut. The right choice depends on root size, distance from the trunk, tree species, tree health, pavement type, and how much damage the root is actually causing. Use this decision sequence before you pick up a saw.
Step 1: Measure the root and its distance from the trunk. Root diameter is the single best predictor of whether cutting is safe. As a working rule that arborists commonly apply:
Roots under about 2 inches across, far from the trunk: Usually safe to prune or remove, especially if they are surface roots lifting only a small section of pavement.
Roots 2 to 4 inches across: Proceed cautiously. These may be structural roots. Cut only if the root is well away from the trunk and the tree is otherwise healthy.
Roots over 4 inches across, or any root within about 6 to 8 feet of the trunk: Treat as structural. Do not cut without an arborist's assessment. These roots anchor the tree and store energy.
Step 2: Judge the tree's condition and species. Some species tolerate root disturbance better than others. Willows, poplars, silver maples, and cottonwoods are fast growers with aggressive surface roots and are more likely to regrow or respond poorly to severe pruning. Oaks, hickories, and other slow-growing species can be set back for years by major root loss.
Step 3: Match the fix to the pavement type. Asphalt flexes and can sometimes be patched over a trimmed root. Concrete is rigid and cracks when a root heaves it; a root that has already lifted a slab usually needs the slab section replaced after pruning, not just patched.
Step 4: Choose among the four realistic options.
Prune the root and repair the pavement: Best for small surface roots causing localized lift. Lowest cost, but the root may regrow.
Install a root barrier and repair: Best when roots are recurring from a nearby tree and you want to protect the repaired section. Does not fix damage already done.
Reroute or redesign the driveway: Best when a large structural root or a protected tree makes cutting unwise. Most expensive, but preserves the tree.
Remove the tree: A last resort when the tree is declining, hazardous, or the root conflict cannot be resolved any other way. Removing a mature tree is a major cost and may require a permit.
Watch Out Cutting a major root can weaken the tree and make it lean or fall. If a root is larger than your wrist or closer to the trunk than the canopy edge, get a certified arborist's opinion before cutting. The cost of an assessment is small compared with a failed tree or a torn-up driveway.
When in doubt, ask a certified arborist to evaluate the tree before you cut anything. An arborist can also tell you whether the tree is protected by local rules, which affects whether you can cut at all.
The article lays out four realistic options for dealing with a root, each suited to different conditions.
Option | Best for | Key difference |
Prune the root and repair the pavement | Small surface roots causing localized lift | Lowest cost, but the root may regrow |
Install a root barrier and repair | Recurring roots from a nearby tree | Protects the repair but does not fix existing damage |
Reroute or redesign the driveway | Large structural root or protected tree | Most expensive, but preserves the tree |
Remove the tree | Declining, hazardous tree or unresolvable conflict | Last resort; major cost and may need a permit |
How to Cut Tree Roots Under Concrete Without Harming the Tree
Cutting roots under concrete takes care. Work slowly, expose the root properly, and remove only what you must. The goal is to relieve the pressure on the slab without opening a large wound in the tree's root system.
Before you dig: locate utilities and mark the work zone. Call 811 at least a few business days before digging (811 Before You Dig). This free service notifies utility operators, who mark gas, electric, water, sewer, and telecom lines.
Expose the root without tearing it. Do not start with a shovel directly over the root. Use a hand trowel, a soil knife, or a shop vacuum to remove soil in small layers.
Choose the right tool and make a clean cut. Use a sharp pruning saw or a reciprocating saw with a clean wood blade. Bypass pruners work for small roots.
Follow these steps in order:
Call 811 and mark all utilities and irrigation lines.
Outline the smallest practical excavation area next to the lifted slab.
Remove soil in layers with hand tools or an air spade to expose the root.
Measure the root and confirm it is safe to cut under the decision rules above.
Cut cleanly with a sharp saw, perpendicular to the root.
Remove the cut section and any loose soil from under the slab.
Backfill with native soil, water gently, and add mulch over the root zone.
Repair or replace the pavement section.
Pro Tip Cut roots during the dormant season, from late fall to early spring, when the tree is not actively pushing growth. This reduces stress and gives the tree a better chance to seal the wound.
Limits on root pruning. Never remove more than about one-quarter of a tree's root system in a single year, and keep cuts as far from the trunk as the project allows. Cuts too close to the trunk can open the tree to rot and instability. If the root you need to cut is large or close to the trunk, stop and bring in a certified arborist rather than improvising.
Protect the remaining driveway. When you lift or replace a slab section, support the adjacent slabs so they do not crack during excavation. Do not drive heavy equipment over the root zone, because compaction damages the fine roots the tree depends on.
Removing Roots Without Killing the Tree
Removing roots without killing the tree means balancing the fix against the tree's health. Here is what helps:
Cut roots during the dormant season, from late fall to early spring.
Use clean, sharp tools to make smooth cuts.
Keep the root zone moist after work, but not waterlogged.
Add mulch over the root zone to protect the remaining roots.
A common mistake is cutting too many roots at once. Spread the work over several seasons if the root system is large.
Installing a Root Barrier and Choosing the Right Root Barrier Depth
A root barrier redirects roots away from the driveway. It is a physical panel buried in the soil between the tree and the pavement.
Barrier depth matters. Most roots grow in the top 18 to 24 inches of soil, so install the barrier at least 18 inches deep. Deeper is better if the roots are large.
Place the barrier about 2 to 4 feet from the trunk to keep it out of the main root zone. Barriers have limits, though. They do not stop roots that already grew under the slab, and they can be damaged during later digging.
Repairing the Driveway After Tree Root Removal
After the roots are removed, repair the driveway surface. Start by cleaning out loose debris and soil under the slab.
For cracks, clean them out and fill with a crack filler. For raised or sunken sections, the damaged area may need to be cut out and replaced with fresh asphalt or concrete. Our guide to fixing sunken asphalt driveway sections covers how to level these areas before resurfacing.
Compact the base well before patching, so the new surface does not settle again. A sealcoat applied after the repair helps protect against water damage and future cracking.
Learn more about asphalt driveway installation if the damage is extensive and a full rebuild makes more sense.
Booking Your Driveway Repair Estimate
If the damage is more than a simple patch, a professional estimate helps you plan the next step. Advanced Paving and Sealcoating, Inc. offers asphalt patching services to restore driveways and lots. You can explore our asphalt patching services to see what repair work involves.
Our team can review your driveway and explain your options. Request your free estimate.
Last Updated: October 29, 2026
Frequently Asked Questions
How do you remove tree roots yourself?
Start by exposing the root with hand tools or an air excavation tool, keeping digging to the area around the root. Cut only small roots, generally those under about 2 inches in diameter, using a clean pruning saw or reciprocating saw. Leave roots thicker than that alone, since large structural roots support the tree and cutting them can destabilize it. If the root sits beneath concrete or asphalt, you will need to saw-cut the pavement first. Before digging, call 811 to have underground utilities marked, and consider an arborist if the root is large or the tree is valuable.
Can you cut tree roots under a driveway without killing the tree?
Often yes, but only if you limit the cut. Removing a small root that is lifting pavement usually causes little harm, while cutting a large root can stress or destabilize the tree. A general rule is to avoid removing more than about a quarter of a tree's root zone in one season. Cut cleanly rather than tearing the root, and keep excavation away from the trunk. Because the risk depends on species, age, and root size, a certified arborist can tell you whether a cut is safe for your specific tree.
How deep should a root barrier be?
Root barriers are commonly installed to a depth of about 18 to 24 inches, and the barrier should extend beyond the root zone that is causing damage. Placement matters as much as depth: install it between the tree and the driveway, and keep it far enough from the trunk to avoid harming major roots. Barriers redirect roots downward or sideways rather than stopping growth entirely, so they work best on new installations or as a supplement to root pruning. Confirm utility locations with 811 before digging a trench.
How do you repair a driveway after removing tree roots?
Request an estimate from Advanced Paving and Sealcoating, Inc. for a quote specific to your driveway.
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