Building in San Francisco Requires Local Expertise
San Francisco's Department of Building Inspection (DBI) enforces some of the strictest plumbing codes in California. Combined with the city's challenging terrain, dense lot coverage, and aging infrastructure that new work must connect to, construction plumbing in SF requires deep local knowledge that suburban plumbers simply don't have.
Whether you're a homeowner adding an ADU to your Excelsior property, a GC managing a gut remodel in the Mission, or a developer building infill housing in the Western Addition — GB Plumbing delivers code-compliant installations that pass SF DBI inspection the first time.
Construction Plumbing Services
San Francisco Construction Challenges
SF DBI Complexity
DBI's plan review process requires detailed isometric drawings, fixture unit calculations, and system specifications. Incomplete submittals get rejected and delay projects by weeks. Our plans are thorough, complete, and pass review consistently.
Existing Infrastructure Integration
New plumbing in SF almost always connects to century-old systems. ADUs must tie into existing laterals (if capacity allows), supply lines connect to aging mains, and new waste must integrate with existing stacks — all requiring careful engineering.
Tight Lot Constraints
San Francisco's compact lots mean zero-lot-line construction, minimal setbacks, and creative routing. ADUs in rear yards, basement conversions, and vertical additions all present unique access and routing challenges we navigate daily.
Our Construction Process
Design & Plan Submission
We design the plumbing system, prepare DBI-compliant plans, and submit for permit. We coordinate with your architect to resolve conflicts before construction begins.
Underground & Rough-In
Sewer connections, under-slab piping, and wall rough installed to schedule. Pressure tested and ready for DBI rough inspection.
Top-Out & Testing
All supply, waste, vent, and gas lines complete. Full system testing confirms zero leaks before walls close up.
Finish & Final Inspection
Fixtures, faucets, appliance connections, and water heater installed. Final DBI inspection and system commissioning.
San Francisco Construction Plumbing Done Right
From DBI plans to final inspection — GB Plumbing delivers complete construction plumbing for San Francisco's most demanding projects.
(650) 235-6443Our Happy Clients
Real people. Real results. See why homeowners across the San Francisco Bay Area trust GB Plumbing for all their plumbing needs.
🇺🇸 🇧🇷 🇪🇸 We speak English, Portuguese and Spanish
"Built an ADU in our backyard. GB handled all plumbing — permits, rough, finish. Passed every inspection first try."
— Sunset ADU Owner Google Review
"Gut remodel of our 1920s Victorian. GB modernized the entire plumbing system while preserving the home's character. Flawless."
— Noe Valley Remodel Client Google Review
"As a GC, I need plumbers who understand SF DBI and show up when scheduled. GB delivers on both every single project."
— Mission District GC Google Review
"Converted our basement into a rental unit. GB handled the tricky below-grade plumbing perfectly. Earning rental income now!"
— Excelsior Homeowner Google Review
"Two infill projects completed with GB. Their DBI plans pass first review consistently. Saves us weeks on every project."
— Richmond District Developer Google Review
"Added a second story with two bathrooms. GB coordinated perfectly with our framer and electrician. Smooth build."
— Bernal Heights Addition Google Review