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.
Our New Construction Plumbing Services
- ADU complete plumbing — full water, drain, vent, and gas systems for detached and attached units
- Bathroom additions — adding a second or third bath to single-bathroom tract homes
- Garage conversions — complete plumbing for kitchenettes, bathrooms, and laundry in converted spaces
- Kitchen remodel plumbing — relocating supply and drain lines for updated kitchen layouts
- Room addition rough & finish — supply, drain, and vent piping for new living spaces
- Gas line extensions — running new gas lines for water heaters, ranges, and HVAC in additions
- Sewer lateral capacity check — verifying your existing lateral can handle additional fixtures
- Permit coordination — preparing documentation and scheduling inspections with San Bruno building department
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 dozens of 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 so often that we know where pipes run before opening walls. This familiarity with common layouts across Crestmoor, Mills Park, and Rollingwood means faster estimates, fewer surprises, and projects that finish on time.
Our Process
Design & Permit
We review your plans, create plumbing layouts, calculate fixture unit loads, and prepare permit applications for San Bruno's building department. We verify sewer lateral capacity and identify any existing pipe issues before work begins.
Underground & Rough-In
We install below-slab drain lines, run supply and DWV piping through walls and floors, and make connections to existing systems. All transition fittings are code-approved and 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 any corrections immediately.
Finish & Inspection
Fixtures are set, connections are made, water heaters are installed, and the system is commissioned. We schedule final inspection and provide documentation for your project records.
