Foundation, Crawlspace & Concrete Contractors in Black Diamond, WA

Bailey, was a real professional. He explained everything so that even a 15yr old would understand.
I'd hire him in a minute.

Bailey Mercer came out on time, which is the number one indicator of professionalism in my experience. He kept the conversation short and to the point. He did not try to upsell me on things didn’t need, and to that point, neither did the sales staff over the phone. Bailey did the measurements, with precision and finished at a reasonable time. I have confidence that when we decide to secure our foundation we will be using Bailey Mercer as our go-to expert when we call TerraFirma.

Seth C. was really helpful this morning. It has been raining so much lately and he was able to walk me through all the issues my daylight basement and garage can have and how TerraFirma fixes them. Really appreciate you--/thanks so much Seth

Didn't end up choosing TerraFirma for the work we are doing but they were very professional and helpful through the whole process, especially our rep, Bailey. Recommend including them in the bids you get if you need foundation work.

Five stars aren't enough. We had a sizable project on an old house in tight quarters with neighbors who were concerned. We knew going into our project that there was going to be a lot of guesswork in the planning, and that whomever we hired for the project would have to make changes on the fly. The planning team was very clear about what they knew, and what they were inferring based on their experience and what they might discover when they started excavating.

They presented us with us a few different proposals with breakdowns of the cost and a list of the pros and cons of every plan, answering all of our questions before we finalized our choice.

The whole team at Terra Firma was incredible throughout; clear, consistent communication about the progress on the project and how it evolved as the plans encountered reality. It was a job well done with consistent care and extra effort. Whether it was the on-site team or the office staff supporting the project, everyone was a genuine pleasure to work with.

Sam was able to provide an excellent inspection and honest report of my crawlspace waterproofing needs. Didn’t feel rushed or pressured. Was able to educate me to better understand the issues and risks. Thank you so much Sam

Absolutely Great Crew-Jorge,Juan and Manuel! Very Professional. Answer all my questions as they worked my Project. Very well organized. Used all the proper safety gear to remain healthy and virtually encapsulated with plastic the interior of my home to contain the dirt/debris tracked in from outside/under the house. They helped set up the electronic gizmos to my WiFi so I can monitor the system they installed. Very happy with the results.

TerraFirma Foundation Systems is excellent at basement waterproofing. Be sure to ask about all the available options so you can choose the one that’s right for you. The company is very capable, but it’s important to do your research before making a decision.

The crew—Antonio, Jessi, and Casey—worked extremely well together. Antonio is especially sharp; whenever I suggested an idea, he immediately understood what I meant and offered an even better solution on the spot.

Robert and Jacob came out on a cold, breezy December day and injected the company's foam-brew under our one-hundred-year-old staircase, raising it nearly 1 inch and thereby reconnecting it to our home! No small feat! As a realtor who has recommended TerraFirma to several of my clients, I've come to expect this kind of service, but I wanted to call out the guys for their professionalism and resolve when rain threatened. They also had great info (pics, measurements, etc.) from the estimator, making the project well-organized and timely. Well done!! Highly recommend.

Hey Folks, So just over a year ago we were having some issues at the house, I wrote to all of you on how wonderful TerraFirma was to us and I am here to tell you... THEY DID IT AGAIN! I starting noticing some movement in the driveway and inside the garage again. Called up Bree in the office and asked to have someone come take a peek. Edwin came out, what an awesome dude! Edwin spent a short time at the house remeasuring a couple things to compare back at the office with measurements from a few months ago, We heard from Bree that the measurements were still within reason. I let Bree know, something is not sitting well with me and I really would like to chat with the Mgr. So I received a call from Tulane, Again SUPER DUDE! Tulane assured me with my husband present that I am not being in any sorts a pain, I have concerns and he and Sam, who came out in 2024 will come to the house.

Well they came, they saw, Oh Boy! I was not wrong, they were here 2.5 hrs and again, the house has had some movement and we need some more work to stabilize. We have some additional C.Y.A's to add to this round, as our neighborhood and home has lots of sand in the soil so we are going to be looking into getting a GEO Engineer out to see what is causing the movement.

I give all the back info, because I want you all to know, if you feel something is not right CALL and have your home looked at. TerraFirma is NOT redoing what they already did, this is all new issues, not their fault at all... Tulane and Sam are amazing, they took the time to explain and give us all options. The info they share through experience and knowledge is beyond me and it is so appreciated.

If you have any foundation, sinking driveways, walkways, stairs, cracking in your walls, around windows, doors.... Call these guys!
I hands down don't always do reviews but I do for these guys because they deserve to have their names out there so you know they are TAKING CARE of their customers the whole way through! 10/10 and then some.... THANK YOU!