4.5 
1.3k+ *The Angi rating for Foundation Drain Installation companies in Diamond Bar, CA is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Foundation Drain Installation needs.
*The HomeAdvisor rating for Foundation Drain Installation companies in Diamond Bar, CA is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Foundation Drain Installation needs.
Last update on August 20, 2026
Serving Diamond Bar, CA and surrounding areas
Approved (Corporate)
In business since 1992
Free estimates
Emergency services offered
"Professional presentation and prompt arrival for quote. Thouroughly inspected the foundation, provided two solutions, tips, and verbal estimate. Did not receive any follow up, including promised written proposal."
+323
Serving Diamond Bar, CA and surrounding areas
Approved
In business since 1981
Free estimates
Emergency services offered
"Ryan was perfectly on-time and was a plumbing scholar and a gentleman. We had a simple drain replacement under a new sink. Going to Western saved me at least another day of trying to figure out proper parts and doing the install myself, and it also saved my wife's ears from hearing my salty language."
+542
Serving Diamond Bar, CA and surrounding areas
Approved
In business since 1993
Free estimates
Warranties offered
"Conrad was so helpful and honest and thorough. He gave me a true assessment of my current system, what needed to be done to fix it, and didn't try to upsell me on any expensive repairs or new installations. Would recommend them to anyone."
+106
Serving Diamond Bar, CA and surrounding areas
Approved
In business since 1978
Free estimates
Emergency services offered
"Christian from McLay Services showed up within the agreed time frame to install a new kitchen faucet and fix a leak in one of my bathtubs. He did a great job. Faucet was installed within 20 to 25 minutes. He also fixed a leak in my bathtub in the Master bathroom and installed new a new drain and spout. He was neat and clean in his work and answered any questions that I had. Very good plumber. I would recommend McLay Services to anyone!!"
+3
Serving Diamond Bar, CA and surrounding areas
Approved
In business since 2007
Free estimates
Credit card accepted
"The team was respectful of my property and worked diligently to ensure that the project was completed within the timeframe and budget we had discussed."
Serving Diamond Bar, CA and surrounding areas
Approved
In business since 1984
Free estimates
Credit card accepted
"AJB Concrete did an AMAZING JOB in EVERYTHING they completed for us to have our above ground pool installed. It looks absolutely wonderful and we get so many compliments on the way it came out! We actually did use them a 2nd time to compliment our back yard with masonry work as well.. and we know for a fact that any future work on concrete or masonry, we will definitely use them AGAIN!! And we would HIGHLY recommend this company to others! THANK YOU AJB CONCRETE FOR AN AMAZING JOB!!"
+48
Serving Diamond Bar, CA and surrounding areas
Approved
Super Service Award Winner
In business since 2024
Free estimates
Emergency services offered
"Wesley was very professional and knowledgeable. He installed our disposal in less than an hour. His prices are competitive. If you have any plumbing issues, I highly recommend Rapid Rescue."
+18
Serving Diamond Bar, CA and surrounding areas
Approved
Super Service Award Winner
In business since 2014
Free estimates
Emergency services offered
"It was easy to make an appointment. The plumber showed up on time and took care of the problem quickly. I would definitely recommend Alpine plumbing."
+26
Serving Diamond Bar, CA and surrounding areas
Approved
In business since 2010
Free estimates
Emergency services offered
"Robert and his crew were really wonderful and did a great job with our patio! Robert was always on time and did the project in the specified amount of time and for a reasonable price. This was a big job where the original concrete patio had to be removed and a new flagstone patio installed in its place. The new patio really pulls the whole backyard together and is such a great addition! Robert was also very good about making adjustments at our request without hesitation. We will be hiring Robert in the near future for additional home improvements!"
Serving Diamond Bar, CA and surrounding areas
Approved
In business since 2000
Free estimates
Small jobs welcome
"Project remove old walkway and steps to front door fast quality and good customer service"
+3
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