Guaranteed Plumbing - Lafayette's Qualified Plumbing Contractor
1031 Blackwood Ln, Lafayette, CA 94549
Business Background
Guaranteed Plumbing is a trusted, locally-owned plumbing and gas line company serving Lafayette and the greater East Bay. Founded in Danville in 2003 by second-generation plumber Marcus Madrid, the business has grown through word-of-mouth referrals built on skilled work and reliable service. Marcus learned the trade from his father and holds a Bachelor's degree from Cal Poly San Luis Obispo. He and his team are personally involved in every job, from simple faucet repairs to large-scale commercial installations. As a preferred vendor with the Town of Danville Building Department, they are fully licensed, bonded, insured, and well-versed in local city codes, ensuring projects meet all regulations. They work closely with homeowners and businesses to provide practical, cost-effective solutions for any plumbing need.
Core Services
- Water heater installation
- Hot water recirculation pump installation
- Gas line installation
- Toilet repair
- Water pipe installation
- Garbage disposal repair
Common Questions
My home's sewer line is backing up. Could this be from tree roots, and can you help?
Yes, tree root intrusion into sewer lines is a common issue for Lafayette properties with mature landscaping. Our team is experienced in diagnosing and repairing root-damaged sewers. We use specialized camera inspections to locate the exact problem and can perform trenchless repair methods to fix the line with minimal disruption to your yard. We also provide guidance on preventive measures to help protect your system.
What does being a 'preferred vendor' with the Town of Danville Building Department mean for my project in Lafayette?
It means our team is thoroughly familiar with the permit and inspection processes for Contra Costa County and surrounding areas. When your plumbing or gas line project requires city approvals, we handle the paperwork and ensure all work meets current local codes. This streamlines the process, helps avoid delays, and gives you confidence that the installation is compliant and safe.
My water heater isn't performing well. Is this a repair or replacement situation?
It depends. Sediment buildup from our local water is a frequent cause of reduced efficiency and noise in water heaters. We can often restore performance by flushing the tank and checking the components. If the unit is old or the tank is compromised, a replacement may be more cost-effective. We'll provide a clear assessment and explain your options for repair or a new, efficient installation tailored to your household's needs.
Business Location & Hours
| Mon: | 7:00 AM - 5:00 PM |
| Tue: | 7:00 AM - 5:00 PM |
| Wed: | 7:00 AM - 5:00 PM |
| Thu: | 7:00 AM - 5:00 PM |
| Fri: | 7:00 AM - 5:00 PM |
| Sat: | Closed |
| Sun: | Closed |
























