San Francisco · San Francisco County
Whole-House Repiping in San Francisco, CA
Repiping in San Francisco usually means replacing century-old galvanized steel supply lines in Victorian and Edwardian flats. The pipe rusts nearly shut, so upper floors get a trickle. Because units are stacked and the piping often serves more than one, the job has to be coordinated across the building.
- Independent local pros
- Free referral, no obligation
- You approve the price before work starts
What is different about whole-house repiping in San Francisco?
In a two- or three-flat building, the supply runs up through the lower units to reach the upper one. Repiping the top flat alone leaves it fed by the old pipe below. Owners in a condominium or tenancy-in-common need to settle which lines are common and how the cost is shared; in a rental building, tenants need notice of shutoffs and access.
Old construction adds to the work: lath-and-plaster walls and ceilings, little or no crawl space, and buildings that touch their neighbors on both sides. San Francisco's water is soft, so the problem is corrosion with age, not scale. Permits are issued by the Department of Building Inspection.
From the San Francisco plumbing guide
Galvanized supply lines
Century-old galvanized pipe rusts nearly shut, causing weak flow on upper floors and discolored water after the building's water has been off.
What to check and ask before work starts in San Francisco
- Ask which lines are shared between units and how the work will be staged
- Ask how plaster will be opened and repaired
- Check your condominium or tenancy-in-common documents for who owns which pipes
- Verify the C-36 license and who pulls the permit
Licensing and permits for whole-house repiping in San Francisco
Plumbing contractors in California are licensed by the Contractors State License Board under the C-36 classification. In San Francisco, plumbing permits are issued by the Department of Building Inspection. In condominiums and tenancy-in-common buildings, check the governing documents to see which pipes are common property before authorizing work.
Keystream Plumbing is a referral service. We do not perform plumbing work or hold a contractor license. The independent plumber you are connected with is responsible for licensing, permits and the work itself.
What the job usually involves
The steps are the same in San Francisco as anywhere; the local conditions above change how each one is done.
- Inspect and plan
- Permit and protect
- Install new lines
- Patch and inspect
Whole-House Repiping questions from San Francisco
Can I repipe only my flat in a San Francisco building?
You can replace the piping inside your unit, but if the old galvanized line feeding it runs through the unit below, pressure will still be limited by that pipe. A plumber can show where the shared section is.
Why does the water run brown first thing in the morning?
Rust from the inside of galvanized pipe collects in water that has sat overnight. It usually clears after a short run. It is a sign the pipe is corroding and nearing replacement.
Sources
- Water quality and sewer system, San Francisco Public Utilities Commission
- Check a contractor license, California Contractors State License Board
Local information reviewed October 5, 2026. Rules and programs change; confirm details with the agency before you rely on them.
More plumbing help in San Francisco
Whole-House Repiping in other cities
Ownership rules, soil, water and pipe materials make this a different job from one city to the next.
Related guides: How to Prevent Frozen Pipes in Winter, Low Water Pressure: Causes and Fixes, How Plumbers Price Jobs: What You're Paying For.
Need whole-house repiping in San Francisco?
Call (833) 520-4758. Same-day service is often available; call to check timing.