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Avatar for Groundworks

Groundworks

4.62(
85
)
Approved Pro

Groundworks

4.62(
85
)
Approved Pro
Customers say: True professional
31 years of experience
Free onsite estimate

Groundworks specializes in helping homeowners with their residential and commercial foundation repair, basement waterproofing and wall repair, and concrete repair needs. Our top priority is providing high-quality home repair solutions and personalized service across the Seattle area. With fully trained technicians, industry-leading products, and nationally backed warranties, Groundworks is here to restore your foundation.

"Fixed my foundation. Thank you"

Ivan K on December 2025

Groundworks specializes in helping homeowners with their residential and commercial foundation repair, basement waterproofing and wall repair, and concrete repair needs. Our top priority is providing high-quality home repair solutions and personalized service across the Seattle area. With fully trained technicians, industry-leading products, and nationally backed warranties, Groundworks is here to restore your foundation.

"Fixed my foundation. Thank you"

Ivan K on December 2025


Avatar for TerraFirma Foundation Systems

TerraFirma Foundation Systems

5.00(
10
)
Approved Pro

TerraFirma Foundation Systems

5.00(
10
)
Approved Pro
Customers say: Quick response
21 years of experience
Free onsite estimate

Thousands of NW homeowners have trusted TerraFirma Foundation Systems to keep their homes safe, dry and stable since 2005. Nearly half of our business comes from referrals or repeat customers. We can help you too! TerraFirma is the NW expert in home foundations, basement and crawl space waterproofing, concrete leveling, and wall stabilization.

"Great; competitive price, installation went great, friendly and responsive staff in person and office"

Andrew M on February 2020

Thousands of NW homeowners have trusted TerraFirma Foundation Systems to keep their homes safe, dry and stable since 2005. Nearly half of our business comes from referrals or repeat customers. We can help you too! TerraFirma is the NW expert in home foundations, basement and crawl space waterproofing, concrete leveling, and wall stabilization.

"Great; competitive price, installation went great, friendly and responsive staff in person and office"

Andrew M on February 2020


Avatar for TerraFirma Foundation Systems

TerraFirma Foundation Systems

4.51(
67
)
Approved Pro

TerraFirma Foundation Systems

4.51(
67
)
Approved Pro
Customers say: Quick response
21 years of experience
Free onsite estimate

Thousands of NW homeowners have trusted TerraFirma Foundation Systems to keep their homes safe, dry and stable since 2005. Nearly half of our business comes from referrals or repeat customers. We can help you too! TerraFirma is the NW expert in home foundations, basement and crawl space waterproofing, concrete leveling, and wall stabilization.

"Had a sump pump installed. Haven’t had a repeat of the problem."

Edward H on December 2025

Thousands of NW homeowners have trusted TerraFirma Foundation Systems to keep their homes safe, dry and stable since 2005. Nearly half of our business comes from referrals or repeat customers. We can help you too! TerraFirma is the NW expert in home foundations, basement and crawl space waterproofing, concrete leveling, and wall stabilization.

"Had a sump pump installed. Haven’t had a repeat of the problem."

Edward H on December 2025


Avatar for Groundworks

Groundworks

New on AngiNew on Angi
Approved Pro

Groundworks

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

Based in Phoenix, AZ, we specialize in foundation repair, basement waterproofing, concrete leveling, and crawl space repair. Serving Arizona, we deliver reliable solutions for businesses and commercial properties. Contact us today!

Based in Phoenix, AZ, we specialize in foundation repair, basement waterproofing, concrete leveling, and crawl space repair. Serving Arizona, we deliver reliable solutions for businesses and commercial properties. Contact us today!


Avatar for SlabJack Geotechnical

SlabJack Geotechnical

5.00(
62
)

SlabJack Geotechnical

5.00(
62
)
Customers say: Super punctual
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers

We are a family owned and operated business with locations in Spokane, Greater Seattle, Tri-Cities and East Wenatchee WA. Our company's main office is in East Wenatchee, WA. We have been in business since 2011, our contractor license is #slabjg*833k2 we are fully insured (1,000,000) and bonded (12,000) and carry all the appropriate insurances to work on your property without any liability to you. Slabjack Geotechnicals polyurethane injection SlabJacking is far superior to last centuries Mudjacking. Less invasive, longer lasting, better aesthetically and with a superior warranty. We raise settled concrete porches, patios, pool decks, shop floors, driveways, sidewalks, garage and basement floors, if it's a slab we raise it! We also underseal slabs with voids, rocking driveway and warehouse slabs. If you suspect voids we have the exact material for the problem. We seal leaking culverts, large diameter pipe, Seawall and Bulkheads, and under-seal concrete ditches and spillways. We also seal many thousands of feet of control joints and cracks in concrete using the best Silicones, Polyurea's and Polyurethanes. Other common names for our services are "pressure grouting" "chemical grouting" "SlabJacking" "Polylevel" and "Mudjacking" We are licensed in the state of Washington and Idaho. We accept Visa, MasterCard and Discover in addition to Business & Personal checks.

"Justin and Dustin were very professional and did a great job with a panel lift and filling cracks in the HOA's concrete cart path."

Rick B on August 2025

We are a family owned and operated business with locations in Spokane, Greater Seattle, Tri-Cities and East Wenatchee WA. Our company's main office is in East Wenatchee, WA. We have been in business since 2011, our contractor license is #slabjg*833k2 we are fully insured (1,000,000) and bonded (12,000) and carry all the appropriate insurances to work on your property without any liability to you. Slabjack Geotechnicals polyurethane injection SlabJacking is far superior to last centuries Mudjacking. Less invasive, longer lasting, better aesthetically and with a superior warranty. We raise settled concrete porches, patios, pool decks, shop floors, driveways, sidewalks, garage and basement floors, if it's a slab we raise it! We also underseal slabs with voids, rocking driveway and warehouse slabs. If you suspect voids we have the exact material for the problem. We seal leaking culverts, large diameter pipe, Seawall and Bulkheads, and under-seal concrete ditches and spillways. We also seal many thousands of feet of control joints and cracks in concrete using the best Silicones, Polyurea's and Polyurethanes. Other common names for our services are "pressure grouting" "chemical grouting" "SlabJacking" "Polylevel" and "Mudjacking" We are licensed in the state of Washington and Idaho. We accept Visa, MasterCard and Discover in addition to Business & Personal checks.

"Justin and Dustin were very professional and did a great job with a panel lift and filling cracks in the HOA's concrete cart path."

Rick B on August 2025


WESTERN CONSTRUCTION SYSTEMS

4.85(
26
)

WESTERN CONSTRUCTION SYSTEMS

4.85(
26
)
Customers say: Quality work
Recommended by 92% of Angi customers
Recommended by 92% of HomeAdvisor customers

Not a franchise, Family owned and operated since 1987. CCB# 94222, Serving the entire NW. FREE Estimates/ Inspections. Western Construction Systems LLC. is a locally owned, family owned and operated specialty construction company serving the entire north-west. WCS LLC. Prides its self in high quality work which is micro-managed by highly trained crews to ensure the highest level of confidant work. WCS LLC. Has also worked internationally in South America and currently has crews in Haiti. We have worked as far south as El Salvador and as far north as Alaska. We are able to attend to small residential job as well as large industrial projects.

"Western Construction Systems came out and did exceptional work at my house! They went above and beyond my expectations! They were friendly, professional, and hard-working! They took care of all the issues that I had concerns with and then some! Their prices were fair, especially for the high quality of work that they did! I know I pestered them with questions, but they were patient every single time. Before I contacted them to have the work done, I had high anxiety about the drainage issues. When they were finished, I felt confident that there were no more issues. Peace of mind is priceless!"

Robyn S on August 2022

Not a franchise, Family owned and operated since 1987. CCB# 94222, Serving the entire NW. FREE Estimates/ Inspections. Western Construction Systems LLC. is a locally owned, family owned and operated specialty construction company serving the entire north-west. WCS LLC. Prides its self in high quality work which is micro-managed by highly trained crews to ensure the highest level of confidant work. WCS LLC. Has also worked internationally in South America and currently has crews in Haiti. We have worked as far south as El Salvador and as far north as Alaska. We are able to attend to small residential job as well as large industrial projects.

"Western Construction Systems came out and did exceptional work at my house! They went above and beyond my expectations! They were friendly, professional, and hard-working! They took care of all the issues that I had concerns with and then some! Their prices were fair, especially for the high quality of work that they did! I know I pestered them with questions, but they were patient every single time. Before I contacted them to have the work done, I had high anxiety about the drainage issues. When they were finished, I felt confident that there were no more issues. Peace of mind is priceless!"

Robyn S on August 2022


Providing sawing and drilling services since 1980, 25 service trucks dispatched daily. Call for free estimate. All major credit cards accepted. Look at the Media section for photos.


G & D Construction

4.83(
6
)

G & D Construction

4.83(
6
)
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers

We are 6 guys total. But if get get a job that it need extra hands and get done fast we hire a sub contractors. Electrical plumbing hardwood floor. Additional address - Po Box 33837 Seattle, WA 98133.

We are 6 guys total. But if get get a job that it need extra hands and get done fast we hire a sub contractors. Electrical plumbing hardwood floor. Additional address - Po Box 33837 Seattle, WA 98133.


1-888-JBC-ON-TIME (888-522-6684). 26 employees in Portland area. No subs used. Payment may be made via PayPal.


TL Concrete

1.50(
2
)

TL Concrete

1.50(
2
)
41 years of experience

TL Concrete (Tech Lightweight Concrete) is a professional concrete service company. We are located in Milton, WA and serve all areas within 75 miles. We serve both residential and commercial clients. At TL Concrete we strive to provide customers with a convenient, quality concrete construction service. We offer top-notch concrete services including gypsum concrete, lightweight concrete, radiant heat topping, concrete floor finishing, concrete stamping, decorative concrete, concrete staining and finishing. Our prices are highly competitive; discounts are available; all work is guaranteed.

"Terry and his son destroyed our home. Judgement from Oregon Builders Board was $217,000 damage. Turns out he was also unlicensed to work in Idaho and Oregon. Never received one cent of the judgement. The owner and family are unlicensed contractor crooks!"

Robert C on August 2021

TL Concrete (Tech Lightweight Concrete) is a professional concrete service company. We are located in Milton, WA and serve all areas within 75 miles. We serve both residential and commercial clients. At TL Concrete we strive to provide customers with a convenient, quality concrete construction service. We offer top-notch concrete services including gypsum concrete, lightweight concrete, radiant heat topping, concrete floor finishing, concrete stamping, decorative concrete, concrete staining and finishing. Our prices are highly competitive; discounts are available; all work is guaranteed.

"Terry and his son destroyed our home. Judgement from Oregon Builders Board was $217,000 damage. Turns out he was also unlicensed to work in Idaho and Oregon. Never received one cent of the judgement. The owner and family are unlicensed contractor crooks!"

Robert C on August 2021

Showing 1-10 of 21
Concrete Leveling questions, answered by experts

For handy homeowners, concrete projects are DIYable, and DIYing is a good way to save on the cost of a concrete slab, walkway, or other concrete work. If you’re completing a larger project or one that’s subject to building codes, you should always hire a professional to ensure the job is done safely and correctly.

The actual moisture level that is acceptable for your concrete floor depends on what primer or flooring material you plan to install above it. For this reason, you should check the manufacturer’s instructions for the exact details.

Generally, the moisture levels should be 3.5% to 4.5%, although it does vary. Some products can handle higher levels of moisture, so you should always test your concrete before purchasing your flooring materials.

Yes, concrete can set in rain, but it’s best if you pour concrete 4 to 8 hours before any rain to ensure it won’t impact its strength and appearance. Exposure to heavy rain during the early stages (the first 48 hours after pouring) can significantly reduce the structural integrity of the concrete. Over time, cracking is more likely due to softer concrete. 

Clean regularly, reseal every 2-3 years, and avoid abrasive cleaning agents to preserve the finish.

Factors like the time of day you choose to seal the concrete, temperature, humidity, and airflow will impact drying time. To shorten the drying time, seal concrete in the late afternoon on a day with a temperature between 45 to 85 degrees Fahrenheit.

The Cosmopolis, WA homeowners’ guide to concrete leveling services

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

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