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  • Average homeowner rating star icon4.5
    Average homeowner rating
  • Verified reviews icon74
    Verified foundation repairs reviews

Find Foundation repair specialists in Devon

Avatar for AJ Waterproofing

AJ Waterproofing

4.98(
172
)
Approved Pro

AJ Waterproofing

4.98(
172
)
Approved Pro
Customers say: Quality work
Recommended by 98% of Angi customers
Recommended by 98% of HomeAdvisor customers
50 years of experience

We are a family run waterproofing specialist company, owned and operated, since 1976 by A.J. DiElsi. We have one crew, one truck and start and finish one job at a time. We are completely insured with general liability and workman's compensation. There is no charge for estimates and we take no deposits on any job. You pay us upon completion of the job. We do not have salesmen. A.J. is the gentleman that comes out to deliver each estimate and he is on each job. We excel in impeccable workmanship, and the jobs are always left cleaner than when we arrived. We give a lifetime guarantee on our French Drains and it is transferable to each new homeowner. Please feel free to call with any questions 610-527-9444 or 610-409-0888, Additional phones: 610-960-1589. Or feel free to email us at : [email protected], you can also check us out on YouTube and our website, ajwaterproofing.com.

"Great job, very professional"

Jerry D on February 2021

We are a family run waterproofing specialist company, owned and operated, since 1976 by A.J. DiElsi. We have one crew, one truck and start and finish one job at a time. We are completely insured with general liability and workman's compensation. There is no charge for estimates and we take no deposits on any job. You pay us upon completion of the job. We do not have salesmen. A.J. is the gentleman that comes out to deliver each estimate and he is on each job. We excel in impeccable workmanship, and the jobs are always left cleaner than when we arrived. We give a lifetime guarantee on our French Drains and it is transferable to each new homeowner. Please feel free to call with any questions 610-527-9444 or 610-409-0888, Additional phones: 610-960-1589. Or feel free to email us at : [email protected], you can also check us out on YouTube and our website, ajwaterproofing.com.

"Great job, very professional"

Jerry D on February 2021


Avatar for Basement Gurus, LLC

Basement Gurus, LLC

4.85(
156
)
Approved Pro

Basement Gurus, LLC

4.85(
156
)
Approved Pro
Customers say: Quality work
16 years of experience
Free onsite estimate

Basement Gurus LLC, is a locally owned and operated company with over 20 years of experience. We specialize in professional waterproofing services. Our commitment is 100% guaranteed customer satisfaction on every project. Call us today, so that we can give you a free estimate and make your project come to life!

"I was getting water in my basement every time it rained, Dan helped me rule out other causes and recommended a french drain. Basement has been bone dry ever since. The workers took great care and even repaired the water damage from before. I highly recommend calling Basement Gurus for any basement related needs"

Andrew R on December 2025

Basement Gurus LLC, is a locally owned and operated company with over 20 years of experience. We specialize in professional waterproofing services. Our commitment is 100% guaranteed customer satisfaction on every project. Call us today, so that we can give you a free estimate and make your project come to life!

"I was getting water in my basement every time it rained, Dan helped me rule out other causes and recommended a french drain. Basement has been bone dry ever since. The workers took great care and even repaired the water damage from before. I highly recommend calling Basement Gurus for any basement related needs"

Andrew R on December 2025


Avatar for Quality 1st Basement Systems, Inc.

Quality 1st Basement Systems, Inc.

4.87(
90
)
Approved Pro

Quality 1st Basement Systems, Inc.

4.87(
90
)
Approved Pro
Customers say: Quick response
27 years of experience
Free onsite estimate

Quality 1st Basement Systems is your local, family owned contractor for Basement Waterproofing, Sump Pumps, Basement Finishing, Foundation Repair, Mold Remediation, Crack Repair, Radon Testing and Radon Mitigation, Egress Windows and Egress Stairwell, and Crawlspace Encapsulation too. 100% FINANCING AVAILABLE and free estimates. We have been in business for 25 years and have five star ratings with Google, Yelp, and the BBB. Winner of the 2021 BBB Torch Award for Market Place Ethics and finalist for the 2022 International BBB Torch award for Market Place Ethics. CONTACT US NOW BY CALLING 1-800-768-6745 OR EMAIL US AT [email protected]

"Installed radon filter without any issues or hassle."

Jonathan M on May 2023

Quality 1st Basement Systems is your local, family owned contractor for Basement Waterproofing, Sump Pumps, Basement Finishing, Foundation Repair, Mold Remediation, Crack Repair, Radon Testing and Radon Mitigation, Egress Windows and Egress Stairwell, and Crawlspace Encapsulation too. 100% FINANCING AVAILABLE and free estimates. We have been in business for 25 years and have five star ratings with Google, Yelp, and the BBB. Winner of the 2021 BBB Torch Award for Market Place Ethics and finalist for the 2022 International BBB Torch award for Market Place Ethics. CONTACT US NOW BY CALLING 1-800-768-6745 OR EMAIL US AT [email protected]

"Installed radon filter without any issues or hassle."

Jonathan M on May 2023


Avatar for Groundworks

Groundworks

4.69(
257
)
Approved Pro

Groundworks

4.69(
257
)
Approved Pro
Customers say: Super punctual
Recommended by 91% of Angi customers
Recommended by 91% of HomeAdvisor customers
29 years of experience

Established in 1997, Groundworks is a distinguished family of companies renowned for delivering unparalleled solutions. From foundation repair, structural reinforcement, crawl space encapsulation, basement waterproofing, and concrete lifting, we provide comprehensive services tailored to meet your needs. With our coverage spanning across Philadelphia & New Jersey, we bring our local expertise closer to you. Groundworks proudly holds accreditation from the Better Business Bureau, a testament to our unwavering commitment to excellence. Drawing from decades of collective experience, extensive industry knowledge, and ongoing specialized training, our dedicated team is poised to safeguard your residential property against water damage, concrete sinking, and foundation instability. At Groundworks, we are not just builders; we are guardians of your peace of mind. Contact us today for a FREE estimate! PA158514 (PA)

"I got my basement waterproofed in January 2023 paid $16K for it & I had to call them twice already because still getting water in the basement not only that but this machine has been beeping consistently every 2-3 seconds because it needs service I called them to come out to resolve the matter but have to wait a whole month for someone to come out! For me to pay $16K to get horrible service & still go through the water issue is not good at all!!!"

SAKINA T on August 2023

Established in 1997, Groundworks is a distinguished family of companies renowned for delivering unparalleled solutions. From foundation repair, structural reinforcement, crawl space encapsulation, basement waterproofing, and concrete lifting, we provide comprehensive services tailored to meet your needs. With our coverage spanning across Philadelphia & New Jersey, we bring our local expertise closer to you. Groundworks proudly holds accreditation from the Better Business Bureau, a testament to our unwavering commitment to excellence. Drawing from decades of collective experience, extensive industry knowledge, and ongoing specialized training, our dedicated team is poised to safeguard your residential property against water damage, concrete sinking, and foundation instability. At Groundworks, we are not just builders; we are guardians of your peace of mind. Contact us today for a FREE estimate! PA158514 (PA)

"I got my basement waterproofed in January 2023 paid $16K for it & I had to call them twice already because still getting water in the basement not only that but this machine has been beeping consistently every 2-3 seconds because it needs service I called them to come out to resolve the matter but have to wait a whole month for someone to come out! For me to pay $16K to get horrible service & still go through the water issue is not good at all!!!"

SAKINA T on August 2023


Avatar for Quality 1st Basement Systems

Quality 1st Basement Systems

4.58(
253
)
Approved Pro

Quality 1st Basement Systems

4.58(
253
)
Approved Pro
Customers say: Super punctual
40 years of experience
Free onsite estimate

Quality 1st Basement Systems has been helping homeowners improve their homes for over 20 years. We have currently helped over 6,000 homeowners with All Things Basementy by designing effective solutions for their home’s needs. Whether our homeowners are interested in waterproofing a wet basement, fixing cracked foundation walls, insulating their crawl spaces, finishing their basements with mold-resistant materials, and raising concrete slabs, we can help! We’re currently the largest waterproofing company serving both residential and commercial clients in the tri-state area and are continuing to grow. As a member of the internationally renowned Basement Systems, Inc. network and Foundation Supportworks, Inc. network, we have global resources, but provide local service! The Basement Systems network thoroughly trains our employees at the Basement Systems, Inc. corporate headquarters in CT. Our hard work and dedication to our customers have earned us an A+ rating with the Better Business Bureau and several Super Service Awards from Angie’s List. We service most of New Jersey, all 5 boroughs of New York City and certain parts of Pennsylvania. Thousands of homeowners have experienced the Quality 1st Basement Systems difference. We invite you to do your homework and check out our credentials and compare. Put our experience and integrity to work protecting your investment. Our reputation exceeds all others because of our culture of WOW customer service.

"Everything went smoothly"

Hector R on December 2023

Quality 1st Basement Systems has been helping homeowners improve their homes for over 20 years. We have currently helped over 6,000 homeowners with All Things Basementy by designing effective solutions for their home’s needs. Whether our homeowners are interested in waterproofing a wet basement, fixing cracked foundation walls, insulating their crawl spaces, finishing their basements with mold-resistant materials, and raising concrete slabs, we can help! We’re currently the largest waterproofing company serving both residential and commercial clients in the tri-state area and are continuing to grow. As a member of the internationally renowned Basement Systems, Inc. network and Foundation Supportworks, Inc. network, we have global resources, but provide local service! The Basement Systems network thoroughly trains our employees at the Basement Systems, Inc. corporate headquarters in CT. Our hard work and dedication to our customers have earned us an A+ rating with the Better Business Bureau and several Super Service Awards from Angie’s List. We service most of New Jersey, all 5 boroughs of New York City and certain parts of Pennsylvania. Thousands of homeowners have experienced the Quality 1st Basement Systems difference. We invite you to do your homework and check out our credentials and compare. Put our experience and integrity to work protecting your investment. Our reputation exceeds all others because of our culture of WOW customer service.

"Everything went smoothly"

Hector R on December 2023


Avatar for Famous Waterproofing Sciences

Famous Waterproofing Sciences

4.78(
18
)
Approved Pro

Famous Waterproofing Sciences

4.78(
18
)
Approved Pro
Super Service Award
Customers say: Quick response
11 years of experience
Free onsite estimate

Great work for interior and exterior waterproofing at great pricing, fully insured, with trained, licensed workers and a lifetime warranty. We also offer structural repairs, foundation work and all things for the basement areas, including renovations, water damage and mold remedy. Pavers and decks or patios are another speciality of ours at great pricing. 24/7 availability. Find confidence in our 5 star reviews from all work done, fully licensed and insured.

"Very professional. Showed up on time and left a clean space afterward. Would hire again."

John S on December 2025

Great work for interior and exterior waterproofing at great pricing, fully insured, with trained, licensed workers and a lifetime warranty. We also offer structural repairs, foundation work and all things for the basement areas, including renovations, water damage and mold remedy. Pavers and decks or patios are another speciality of ours at great pricing. 24/7 availability. Find confidence in our 5 star reviews from all work done, fully licensed and insured.

"Very professional. Showed up on time and left a clean space afterward. Would hire again."

John S on December 2025


Avatar for Waterproofing One

Waterproofing One

4.69(
58
)
Approved Pro

Waterproofing One

4.69(
58
)
Approved Pro
Customers say: Quality work
Recommended by 96% of Angi customers
Recommended by 96% of HomeAdvisor customers
17 years of experience

Waterproofing One specializes in making water and mold issues in your home or business a thing of the past. The the tendency for moisture to cause mold is a concern of homeowners and buyers alike. Waterproofing One offers many services to remedy those moisture concerns! Installing an interior or exterior pressure relief system, addressing cracks in the foundation or encapsulating your crawlspace are some of the many options we offer to keep your environment dry and mold free.

"After they completde a big job, they missed a spot and I was not able to reach them to have it fixed."

Sue K on November 2021

Waterproofing One specializes in making water and mold issues in your home or business a thing of the past. The the tendency for moisture to cause mold is a concern of homeowners and buyers alike. Waterproofing One offers many services to remedy those moisture concerns! Installing an interior or exterior pressure relief system, addressing cracks in the foundation or encapsulating your crawlspace are some of the many options we offer to keep your environment dry and mold free.

"After they completde a big job, they missed a spot and I was not able to reach them to have it fixed."

Sue K on November 2021


Avatar for Groundworks

Groundworks

4.39(
99
)
Approved Pro

Groundworks

4.39(
99
)
Approved Pro
Customers say: Super punctual
29 years of experience
Free onsite estimate

Groundworks employs patented solutions to target foundation, basement, concrete, and crawl space challenges at their source. Our customized repairs safeguard homes in Philidelphia, enhancing safety, appearance, and value.

"Great Job. Very professional."

Richard A on March 2025

Groundworks employs patented solutions to target foundation, basement, concrete, and crawl space challenges at their source. Our customized repairs safeguard homes in Philidelphia, enhancing safety, appearance, and value.

"Great Job. Very professional."

Richard A on March 2025


Grady's Painting Plastering/Construction

4.56(
54
)
Approved Pro

Grady's Painting Plastering/Construction

4.56(
54
)
Approved Pro
Customers say: Quality work
57 years of experience
Free onsite estimate

WE SPECIALIZE IN THE HISTORICAL REPAIR AND RESTORATIONS FOR INTERIOR AND EXTERIOR. WE WORK THE WHOLE STATE OF NEW JERSEY, MARYLAND, WASHINGTON DC, CONNECTICUT, VIRGINA AND MASSACHUSETTS. WE ARE LICENSED AND INSURED IN ALL STATES. WE ARE WILLING TO TRAVEL, ANY JOB SMALL OR LARGE. CONSULTATION AND TRANSPORTATION FEES WILL APPLY. WE DO WINDOW REPAIR. PLASTER REPAIRS. AND ALL MASONRY REPAIRS

"We had cracks in the dyed mortar of the bricks above our garage. Grady took the time to match the color, even with the color having aged 10 years, and you would not even be able to tell that there was new mortar. If your project is anything like ours, you will not be disappointed."

Bradley S on August 2024

WE SPECIALIZE IN THE HISTORICAL REPAIR AND RESTORATIONS FOR INTERIOR AND EXTERIOR. WE WORK THE WHOLE STATE OF NEW JERSEY, MARYLAND, WASHINGTON DC, CONNECTICUT, VIRGINA AND MASSACHUSETTS. WE ARE LICENSED AND INSURED IN ALL STATES. WE ARE WILLING TO TRAVEL, ANY JOB SMALL OR LARGE. CONSULTATION AND TRANSPORTATION FEES WILL APPLY. WE DO WINDOW REPAIR. PLASTER REPAIRS. AND ALL MASONRY REPAIRS

"We had cracks in the dyed mortar of the bricks above our garage. Grady took the time to match the color, even with the color having aged 10 years, and you would not even be able to tell that there was new mortar. If your project is anything like ours, you will not be disappointed."

Bradley S on August 2024


Groundworks

New on AngiNew on Angi
Approved Pro

Groundworks

New on AngiNew on Angi
Approved Pro
29 years of experience
Free onsite estimate

Groundworks employs patented solutions to target foundation, basement, concrete, and crawl space challenges at their source. Our customized repairs safeguard homes in Philidelphia, enhancing safety, appearance, and value.

Groundworks employs patented solutions to target foundation, basement, concrete, and crawl space challenges at their source. Our customized repairs safeguard homes in Philidelphia, enhancing safety, appearance, and value.

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Foundation Repair questions, answered by experts

If your foundation isn’t properly square, there’s a chance that anything you built before detecting the issue may need to be torn down. A major miscalculation could leave some walls of your home unsupported. 

Addressing gaps and cracks reduces heat loss and improves energy use.

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.

Yes, you can fix a block foundation. It’s important to address the issue immediately and have a foundation repair professional understand the severity of the issue and determine the best course of action. If the wall collapses before the foundation is repaired, then you’ll have to reassess your entire foundation.

Cracks, spalling, uneven surfaces, and weather damage often necessitate professional repair or resurfacing.

The Devon, PA homeowners’ guide to foundation repairs

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

What do you need done? We’ll find top pros.
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