San Bruno's ADU & Addition Boom: Expert Plumbing for Growing Homes
San Bruno families are adding space to their post-war tract homes rather than moving. With California's relaxed ADU laws and rising property values, homeowners across Crestmoor, Mills Park, and Rollingwood are building accessory dwelling units, converting garages, and adding bathrooms to accommodate growing families or generate rental income.
GB Plumbing specializes in the unique plumbing challenges these projects present. Most San Bruno homes were built in the 1950s and 1960s with galvanized steel supply lines and cast iron drain systems. Connecting modern plumbing to these aging systems requires expertise in transition fittings, proper venting, and code-compliant tie-ins that won't create problems down the road.
From the split-level homes of Crestmoor and Portola Highlands to the single-story ranches along San Bruno Avenue, we understand the standard floor plans and pipe routing that makes San Bruno construction predictable — and we know where surprises hide. This familiarity means faster rough-in times, fewer change orders, and projects that stay on schedule.
Construction Plumbing Services for San Bruno
Why San Bruno Homeowners Choose GB Plumbing
ADU Boom Expertise
San Bruno families are adding ADUs for rental income and multigenerational living. We've plumbed backyard units and know exactly what's needed — from sewer lateral capacity to independent water heater sizing — to get your ADU permitted and functional.
Connecting New to Old
Your 1950s-60s home likely has galvanized supply lines and cast iron drains. We specialize in integrating modern PEX and ABS systems with 50-70 year old infrastructure using proper transition fittings that prevent corrosion, leaks, and code violations.
Tract Home Layout Knowledge
We've worked in San Bruno's standard floor plans across Crestmoor, Mills Park, and Rollingwood so often that we know where pipes run before opening walls — meaning faster estimates, fewer surprises, and projects that finish on time.
Our Construction Plumbing Process in San Bruno
Design & Permit
We review your plans, create plumbing layouts, calculate fixture unit loads, and prepare permit applications for San Bruno's building department, verifying sewer lateral capacity before work begins.
Underground & Rough-In
We install below-slab drain lines, run supply and DWV piping through walls and floors, and make code-approved connections to existing systems, all inspected before covering.
Top-Out & Testing
Vent lines are extended through the roof, gas lines are pressure-tested, and the entire system undergoes air and water testing. We schedule the rough inspection and address corrections immediately.
Finish & Inspection
Fixtures are set, water heaters installed, and the system commissioned. We schedule final inspection and provide documentation for your project records.
San Bruno ADU or Addition? Start with the Right Plumber.
From permit coordination to final inspection, GB Plumbing handles new construction plumbing for ADUs, additions, and remodels throughout San Bruno. Licensed, insured, and experienced with the city's building department.
(415) 738-1450Our Happy Clients
See what homeowners across the San Francisco Bay Area say about GB Plumbing.
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🇺🇸 🇧🇷 🇪🇸 We speak English, Portuguese and Spanish
"GB Plumbing handled all the plumbing for our backyard ADU in Crestmoor. They connected everything to our 1958 home's existing system without any issues. Passed inspection on the first try."
— Crestmoor Homeowner Google Review
"We added a second bathroom to our Mills Park ranch home. GB Plumbing figured out how to tie into the existing cast iron stack without tearing up the whole house. Professional work from start to finish."
— Mills Park Homeowner Google Review
"Converted our Rollingwood garage into a studio apartment for my mother-in-law. GB Plumbing installed a full bathroom and kitchenette. They handled the permits and passed every inspection."
— Rollingwood Homeowner Google Review
"Kitchen remodel in Belle Air went smoothly thanks to GB Plumbing. They relocated the sink, added a dishwasher line, and ran gas for our new range. Clean work and great communication throughout."
— Belle Air Homeowner Google Review
"Added a master suite to our split-level in Portola Highlands. The plumbing was complex because of the elevation changes, but GB Plumbing engineered a solution that works perfectly. Highly recommend."
— Portola Highlands Homeowner Google Review
"Professional from start to finish. Our kitchen remodel plumbing was flawless."
— South San Francisco Google Review