4.4 
89 *The Angi rating for French Drain Service companies in Lagunitas-Forest Knolls, CA is a rating based on verified reviews from our community of homeowners who have used these pros to meet their French Drain Service needs.
*The HomeAdvisor rating for French Drain Service companies in Lagunitas-Forest Knolls, CA is a rating based on verified reviews from our community of homeowners who have used these pros to meet their French Drain Service needs.
Last update on December 09, 2025
Serving Lagunitas-Forest Knolls, CA and surrounding areas
Approved
In business since 2015
Free estimates
Emergency services offered
"Jose installed a French drain and piping for the downspouts to drain into. Jose was very prompt and courteous. He kept me updated throughout the course of the project."
+25
Serving Lagunitas-Forest Knolls, CA and surrounding areas
Approved
Super Service Award Winner
In business since 2023
Emergency services offered
Warranties offered
"These guys are the best. Did a partial home repipe of both the water and drain pipes. Other plumbers tried to upsell us by replacing newer pipes and the water heater. Ray and Alex just did the repiping that was necessary. Excellent communication, friendly and on time. Even worked in tough, rainy conditions. Ray owns his own business and takes pride in his work. Recommended him to all my neighbors."
+2
Serving Lagunitas-Forest Knolls, CA and surrounding areas
Approved
In business since 1991
Emergency services offered
Warranties offered
"Brian was superb in every way. Friendly, knowledgeable, an quick. I guess the only complaint I have is the high cost in general of plumbing services."
Serving Lagunitas-Forest Knolls, CA and surrounding areas
Approved (Corporate)
In business since 2000
Free estimates
Credit card accepted
"Ask for Ryan. See my review."
+1
Serving Lagunitas-Forest Knolls, CA and surrounding areas
Approved
Free estimates
Emergency services offered
Small jobs welcome
Your plumbing problem becomes our problem to solve.\n\nThat’s not just a tagline, it’s how we operate. When you call GOFLOW, you’re getting a team that knows this area, knows plumbing, and genuinely cares about doing the job right.\n\nWe’re not a franchise. We’re not a call center routing you to whoever’s available. We’re a local company built by plumbers who got tired of watching customers get treated like transactions instead of people.
+2
Serving Lagunitas-Forest Knolls, CA and surrounding areas
Approved
In business since 2019
Free estimates
Warranties offered
"Ehly Renales was very pleasant and professional. He gave a clear estimate and we discussed repair of AC unit versus replacement. I decided with repair. He finished the job in 1 hour and AC was working. Also, he was very respectful about wearing shoe coverings when he entered our home and he also wore PPE(to protect himself and my family because of Covid-19 pandemic). In short, I definitely recommend this company and Ehly for AC repair"
Serving Lagunitas-Forest Knolls, CA and surrounding areas
Approved
In business since 1968
Free estimates
Warranties offered
"Very well Bragg rep was friendly and personable. I called at 9.30pm on a hot day. AC was fixed by 10.00am next morning. I was very pleased."
+9
Serving Lagunitas-Forest Knolls, CA and surrounding areas
Approved
In business since 2009
Free estimates
Emergency services offered
"Customer Service oriented. Attention to detail. Guaranteed satisfaction."
+15
Serving Lagunitas-Forest Knolls, CA and surrounding areas
Approved
In business since 2016
Free estimates
Customers say: True professional
We pride our company on reliability, great communication, integrity, and quality work. We are experts in our trade and will do our best to keep you as educated as we can on your particular task or project. We look forward to earning your business! Call Today!\n
+17
Serving Lagunitas-Forest Knolls, CA and surrounding areas
Approved (Corporate)
In business since 2023
Free estimates
Warranties offered
"Groundwork’s did a great job on our house. Luis G was an amazing Forman with Ken H and Mark P all waterproofed under our house. They worked quickly, efficiently and thoroughly left all areas in tact and clean. Luis communicated very clearly about the all aspects of the job until it was completed."
+16
From average costs to expert advice, get all the answers you need to get your job done.
A French drain costs around $9,250 to install, but several factors will determine the final price you pay. Learn the cost to install French drains in this guide.
Inspecting and cleaning your French drain regularly is important for its function and longevity. Learn all about French drain maintenance.
You’ve decided on a French drain system but need to determine whether the drain holes should face up or down. Our guide can point you in the right direction—literally.
French drains help keep water away from the interior and exterior of your home. There are three different French drains to choose from, based on where water collects.
How much water can a French drain handle? Find out a French drain’s drainage capacity and the factors that impact it.
How deep is a french drain buried and how does it work? Learn how deep a french drain needs to be to work properly and other aspects to consider.
