Location and Projects
Mark Dowis Plumbing
Professional, Honest, Quality Service.
Over 30 years of experience with Residential and Commercial projects. Top to bottom remodels.
No job is too big or too small.
805-573-5773
From BuildZoom: Mark Dowis Plumbing, 112 Edgar Ct, Thousand Oaks, CA (Owned by: Mark Roland Dowis) holds a Plumbing license according to the California license board.
Their BuildZoom score of 83 does not rank in the top 50% of California contractors.
Their license was verified as active when we last checked. If you are thinking of hiring Mark Dowis Plumbing, we recommend double-checking their license status with the license board and using our project planner to get competitive quotes.
Mark Dowis Plumbing Services
Mark Dowis Plumbing Contact Information
Mark Dowis Plumbing Reviews
4 out of 5 stars, based on
6
reviews
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By J.p.April 27, 2022
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By Nancy A.March 28, 2020Plumbing, clearing drains, finding leaks$145
Mark Dowis is the best plumber we’ve ever had. He genuinely cares about his customers and is a wonderful person, a capable problem solver and has 35 years of experience. He is incredibly responsive and reliable. If he can’t come out right away, he’ll try to help over the phone.
We recently remodeled our kitchen and the kitchen contractor’s so-called plumber botched up the dishwasher installation and left us with leaks under the sink. Mark came to the rescue and quickly figured out what was wrong and fixed everything.
Mark is a reasonably priced plumber who you will get to know and love as we have. Don’t hesitate to call when you need a plumber (805) 573-5773
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By Patrick G.July 21, 2018Install appliances and fixtures in a remodel
Apparently, Mark wrote the three reviews. BEWARE-be sure to get a price UPFRONT; otherwise you will be in for a very unpleasant surprise. He charged $4,887.50 to install a refrigerator, place the oven in the cabinet (not hooked up), a dishwasher, a gas cooktop, the dryer vent, two toilets and a kitchen sink with a garbage disposal and a filtered water faucet. As I had a quote for $525 to install all the appliances, he charged over $4,300 to install the kitchen sink/garbage disposal & filtered water and two toilets. Also, to get him back to finish, I had to say I was hiring another plumber to finish the work he said had time to do. I have dealt with many contractors over the years and Mark is in a class of his own.
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By Harry S.March 13, 2018Toilet seal repair$330
Another “10 out of 5” stars. Mark did a superb job for us, was super-efficient and gave me free instruction on how to fix toilets and what to look for. As a former Seabee, he knows how to do anything! Friendly and very personable. Highest recommendation.
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By a user in Simi ValleyApril 6, 2017Water Heater replacement2 days10 out of 5 Stars!
My usual plumber was not available when I noticed that my water heater was leaking, so I called my Heating and Air Conditioning man for a referral. He referred Mark and told me that Mark is the only plumber he would let into his own house. I was told that Mark was honest, reliable and always did the job the right way the first time. Perfect! Just what I needed. Mark came out 2 hours after I called him and stayed until 8:00 pm that evening. He had me pay the plumbing supply directly so that I only paid the wholesale discounted price (no mark-up), and then charged me an hourly fee to install. He ended up staying later than his original estimated time but did not charge me more for the extra time. In fact, he returned the next day to install another part and again did not charge me. Mark was fantastic! I can not recommend him highly enough. TEN STARS!!!!!!
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By Ken R.January 29, 20172 days
You judge skilled workers on the completion of their work. Mark Dowis was highly recommend to us and he exceeded our expectations. Mr. Dowis did exactly what he said he was going to do. Was always on time, very well organized and was extremely clean in his work method. We were very comfortable with Mark in our home. His problem solving skills were impressive and his plumbing skills exact. Without hesitation we recommend Mark Dowis 100 percent.
This is a sample of this contractor's permits. Click here to access their complete permit history.
Recent Buildzoom Projects
Mark Dowis Plumbing License info
Verified License
| License # | 660276 |
| Status | Active |
| State | California |
| Type | Plumbing |
| Business Type | Sole Ownership |
- BuildZoom verified this license was active as of February 2026.
Verify this license's status for Mark Dowis Plumbing at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
83
BuildZoom Score
Bonded
| Bonded Agent | Western Surety Company |
| Bond Value | $15,000 |
Insured
| Workers Comp Provider | Technology Insurance Company Inc |
This plumber was overpriced and installed incorrect parts for a toilet that had a low tank. Instead of fixing the issue he created, he wanted to replace the entire toilet. Ended up hiring a handyman that was able to fix the issue. Do not recommend this vendor at all.