How to Fix a Sinking Concrete Walkway at Home?
Last updated October 31, 2026
The short answer
Assess the Cause First
Before you choose a repair method, figure out why the walkway sank. Common causes include soil erosion from water runoff, poor compaction during the original pour, or tree roots growing underneath. In coastal areas with frequent storms, water saturation is a common culprit. Walk the area after a rain and look for soft spots or pooling water near the slab edges.
Check for cracks or gaps where water can enter. If the walkway is near your foundation, also inspect for drainage issues that might direct water toward the house. A sinking walkway can sometimes signal a larger problem, like a leak in an underground pipe. In that case, a leak detection service might help pinpoint the source before you patch the surface.
Lift and Level the Slab
Mudjacking, also known as slab jacking, is a common DIY-friendly approach for minor settling. You drill small holes in the concrete and pump a slurry of sand, cement, and water underneath. As the slurry fills the void, it lifts the slab back to its original level. This method works well if the sink is less than a couple of inches and the concrete is in good shape.
For deeper voids or more severe sinking, polyurethane foam injection is another option. The foam expands and hardens, providing a stable base. However, this technique requires specialized equipment and knowledge. If you are not comfortable with the process, local water damage pros can handle the lifting and leveling safely, ensuring the walkway sits flush again.
- Drill holes in a grid pattern, about 3 to 4 inches apart
- Mix the slurry to a thick, pourable consistency
- Pump the slurry slowly to avoid cracking the slab
- Fill the holes with a concrete patch after leveling
- Allow proper curing time before walking on it
Repair Cracks and Joints
After leveling, you need to address any cracks or joints. Use a concrete patching compound for small cracks, and a flexible sealant for expansion joints to prevent future water intrusion. Clean the surfaces thoroughly and apply the patch according to the manufacturer's instructions. A smooth finish will also reduce trip hazards.
For larger cracks, you might need to widen the crack slightly to create a V-shape, then fill it with a sand-mix concrete. Keep the patch moist for a few days to ensure proper curing. If the walkway has multiple issues, consider replacing the damaged sections entirely, but that is a bigger project that might require professional help.
Improve Drainage
To keep the walkway from sinking again, you must address the underlying drainage problem. Redirect downspouts away from the walkway, and add a French drain or a swale if water tends to pool. In coastal regions where heavy rain is common, proper grading is essential. Ensure the soil slopes away from the walkway and your foundation.
You can also install a plastic or fabric barrier under the walkway to prevent soil erosion. If you have tree roots, you might need to prune them or install a root barrier. Regular maintenance, like clearing leaves and debris, helps keep water flowing away. These steps reduce the chance of future settling and extend the life of your repair.
- Extend downspouts at least 5 feet from the walkway
- Grade the soil to slope away at a 1 to 2 percent angle
- Use a permeable paver or gravel for new sections
- Inspect for signs of erosion after heavy rain
- Consider a root barrier if trees are nearby
When to Call the Pros
If the sinking is severe, the walkway is cracked in several places, or you notice it pulling away from the house, you might need a more extensive repair. The pros can evaluate the situation and determine if the underlying soil needs stabilization or if the slab must be replaced. They have the equipment to handle large lifts and can also check for water damage in adjacent structures.
Also, if you suspect a pipe leak is causing the erosion, a plumber or leak detection specialist can help. For a comprehensive assessment, a water damage inspection service can identify hidden moisture issues. While you can fix minor settling yourself, a professional opinion can save you from repeated repairs. Remember to check your policy if you think water damage is involved, as some situations might be covered.
Talk to someone now
Water keeps spreading into floors and walls, so it is worth acting early. Calls are answered 24/7.
Call Now (617) 404-2753Frequently asked questions
Can I fix a sinking concrete walkway myself?
Yes, for minor settling of less than an inch, you can use a DIY mudjacking kit or a concrete patch. However, if the slab is severely cracked or the void is deep, you may need professional equipment to lift it properly without causing further damage.
How much does it cost to repair a sinking walkway?
The cost depends on the size of the walkway, the repair method, and the extent of the damage. Mudjacking a small section often costs a few hundred dollars, while larger repairs or foam injection can run into the thousands. Get a local pro to assess the job for an accurate price.
Will a sinking walkway cause foundation problems?
It can, especially if the sinking is due to soil erosion that also affects the foundation. Water that pools near the walkway can seep into the soil and undermine your foundation's support. Fix the drainage issue and the walkway to protect your home's structure.