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  • Average homeowner rating star icon3.9
    Average homeowner rating
  • Verified reviews icon35
    Verified foundation repairs reviews

Top-Rated Foundation repair specialists in Windham - Updated Nov 2026

Avatar for A.G. Construction, LLC
A.G. Construction, LLC
4.8(
6
)
Foundation Drainage - Install or Replace

Serving Windham, ME and surrounding areas

Approved

In business since 2010

Free estimates

Offers commercial services

"Andrew and his crew did an amazing job building this garage. Even though he ran into some issues with the supplier of products he went above and beyond to make sure we were kept informed. Additionally, he also replaced (and improved) an existing garage door in the lower level of our home. He also repaired some siding on our house. They even put our two garage door openers in. Overall, we were more than please with his work and his crew."
Jefferson Deck Rebuild
Jefferson Deck Rebuild
Jefferson Deck Rebuild
Camp on post
Camp on post

+27

Response time2 days
Recommended by100%of homeowners
Avatar for The Eagles LLC
The Eagles LLC
New to Angi
Concrete Foundation - RaiseConcrete Foundation - RepairPoured Concrete Wall - Repair

Serving Windham, ME and surrounding areas

Approved

Free estimates

Emergency services offered

Small jobs welcome

The Eagles are specialized in Masonry and Waterproofing. The Eagles Focus on New Buildings, Repairs, Designs, Extensions, demolitions, Etc. We Provide work related to bricks, chimneys, retaining walls, veneer stone, blue stone, granite stone, pavers, Asphalt driveways, concrete slab, basement foundations, patio, decking, fencing, cinder block walls and snow removal. We also provide free estimates for any project around Massachusetts and New Hampshire. Please give us a call or mail at any time to provide an appointment or meeting to your location to provide an instant estimate or for building any designs. \n

Chimney Completely Finished
Chimney Repointing
Stairs Restoration
Stairs Restoration
Stairs Restoration

+67

6 neighbors recently requested a quote
Avatar for octagon-restoration
octagon-restoration
4.7(
96
)
Foundation Drainage - Install or ReplaceFoundation, Basement or Crawlspace - Waterproofing / Encapsulation

Serving Windham, ME and surrounding areas

In business since 2002

Free estimates

Emergency services offered

"I called Octagon the day after we had an upstairs water leak. The next day, Octagan had scheduled a technician to assess the damage and set up the mitigation solutions to dry out the damage before mold could set in. Everyone from Octagon was friendly, professional and very responsive. If you need a fast, reliable and effective response, you will find it with Octagon!"
Water extraction.
Octagon vehicles
Drying structure damaged by water.
MOLD REMEDIATION
Dirty air duct.

+2

Response time6 hrs
Response rate100%
Recommended by90%of homeowners
DryLock Systems
3.8(
68
)
Concrete Foundation - RepairFoundation Drainage - Install or ReplaceFoundation, Basement or Crawlspace - Waterproofing / Encapsulation

Serving Windham, ME and surrounding areas

In business since 1985

Free estimates

Warranties offered

"Rob and Jacob did an amazing job repairing our sump pump setup and repairing leaks in our basement. They are very professional and helpful, worked cleanly and explained everything that they were doing. We recommend them highly."
Response time2 days
Recommended by97%of homeowners
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Foundation Repair FAQs, answered by experts

You can strengthen a weak foundation using a few different foundation repair methods, including underpinning, slab jacking, foam jacking, installing carbon fiber support strips, or using a sealant or epoxy crack injection. It’s worth noting that the best way to strengthen your foundation permanently is to fix the underlying issue first and then use a permanent solution to reinforce it. If you’re unsure who to call for foundation repairs, a foundation repair contractor or structural engineer can help find the best solution for your home.

Some foundation repairs are permanent, like underpinning and exterior drainage systems like the French drain. These fixes address the underlying problems—insufficient support from the soil and hydrostatic pressure on your foundation walls, respectively—so they can last for many decades, making them “lifetime fixes.” There are other solutions to address these issues that will last for up to a decade, making them temporary. These include slabjacking to raise concrete slabs back into place and dampproofing to reduce the water in the soil that interacts with the concrete foundation.

Whether your homeowners insurance covers slab leak repairs depends on your specific policy and the cause of the leak. Many policies cover slab leaks resulting from a covered peril, such as a natural disaster, a falling tree, or pipes freezing and bursting within the slab. However, damage caused by invading tree roots, corrosion, or leaks from appliances may not be covered by a standard policy. It's a good idea to also check your home warranty plan for potential coverage if an appliance is the source. Contact your insurance provider for a full explanation of what your policy covers.

You’ll need to reseal the foundation every five to 10 years, depending on the sealant you’ve used, the moisture conditions present in and around your home, and the condition of your foundation. Having a foundation inspection conducted before reapplication can help you catch any problems before you begin resealing. Of course, if you notice any new leaks or other moisture problems at any time, it may be necessary to reseal the foundation sooner.

Concrete spalling can be fairly serious, especially if left untreated or in a public area. It can be a tripping hazard and, if not resolved, can lead to structural instability.

The Windham, ME homeowners’ guide to foundation repairs

From average costs to expert advice, get all the answers you need to get your job done.