Your First Choice For Plumbing & HVAC Services In Diamond Bar, CA
Looking for plumbing or HVAC services in Diamond Bar, CA? Look no further than Klaus & Sons. We offer 24-hour emergency plumbing service, so you can rest assured that we'll be there when you need us. We also provide maintenance, installation and repair of plumbing and HVAC systems. Whether you're having a plumbing emergency or just need routine maintenance, our team is here to help. Contact us today to schedule a consultation. We look forward to serving you!
Since 1973, we've cared for the citizens of Diamond Bar, CA. See why we we're their top choice by reading the reviews below!
Recent Jobs and Reviews in Diamond Bar, CA
Customers say: The provided content describes the overall sentiment of the reviews as positive. The reviews consistently mention positive experiences with the company, praising their communication, professionalism, quality of work, and timely completion of projects. Customers express satisfaction with the company's ability to handle various plumbing issues, their friendly and knowledgeable staff, and their commitment to customer satisfaction. There are also mentions of competitive pricing and the company's reputation for excellence. However, there are a few negative reviews that mention issues with pricing and a lack of resolution for some plumbing problems. Overall, the sentiment is positive, with more positive reviews outweighing the negative ones.
Our Local Reviews by City
- Chino, CA (6)
- Chino Hills, CA (3)
- Claremont, CA (41)
- Covina, CA (2)
- Diamond Bar, CA (2)
- Fontana, CA (4)
- Glendora, CA (3)
- La Verne, CA (5)
- Monrovia, CA (1)
- Montclair, CA (2)
- Ontario, CA (13)
- Pomona, CA (8)
- Rancho Cucamonga, CA (31)
- San Dimas, CA (3)
- South Pasadena, CA (1)
- Upland, CA (83)
Job Locations and Reviews


(8-10) COD. Spoke with MaryKay. Her clothes washer leaks at the valves when it's in use. She's not sure if just the toggles need to be replaced or if the entire valves. She also has a toto toilet that makes funny noises. She would like the issue assessed to see if she needs a new toilet or if she just need to get a few parts replaced. Please get approval on pricing BEFORE performing any work!

Per Sal, they will be descaling and hydro jetting 120 feet for $4500.

10-12. Net 30. I spoke to Brent (626) 827-843, this is for the barbershop, the main line is backed up and not draining.

12 - 1. Spoke to Dante. He is pretty positive he has a leak, coming from second floor, leaking into the living room. It looks like it's more than one. He turned water off because it just started dripping right now. Noticed ceiling water spot.
Mario is fantastic, professional, accountable.

(8-10) Per Mario, open ticket to lower ABS drain

1 - 5. Spoke to Dale. 2 thermostats not working from install about 10 years ago. Lennox system Icomfort Wi-Fi part #103445-04. Said they have "gone squirrelly", knows there are newer versions of this available. Quoted $158 for diagnostic. Go over options with him

2-4 Time requested. I spoke with Ron, let him know that parts were in for the toilet.


12-2. COD. I spoke to Julio, they are having some drains that are backing up and bubbling and they need an estimate to get it fixed.

8-12. COD. I spoke to Ramon, their hvac unit is not turning off, they had to unplug the unit to keep it from running nonstop.

12 - 2. Per Mario, coming out with Jesse for leak

Customer will be keeping an eye on leak and if leak persists they will call to check waste Ines for possible leak


Experience top-notch leak detection and repair services at your convenience. Our team will assess the issue from the outside with precision, ensuring a thorough inspection. Contact Arnon for approval and estimates, with easy on-site fixes. Secure payment with CC for approved work.
Very prompt and knowledgeable.


Per James will lead the repipe crew at this job before leaving for Nong Shim. Quality repiping services will be provided with expert skill and efficiency.


James will be leading the repipe crew at your location before heading to Nong Shim. Trust our expert team to provide efficient and professional repiping services for your property.

Yesterday, I completed a gas line repair involving a corroded section of a residential natural gas pipeline. Using a high-grade steel pipe, I cut out the damaged segment and installed the new section using welded connections to ensure a leak-proof seal. I then conducted a pressure test to verify the integrity of the repairs. This was followed by a thorough leak detection process using a specialized gas detector. The repair ensures safe and efficient gas flow to the home’s appliances.