Kitchen and bathroom remodel plumbing in Marin County
We handle the plumbing side of kitchen, bathroom and laundry remodels across Marin County: moving fixtures, new supply and drain lines, shower valves, and installing sinks, faucets, dishwashers and disposals. We work alongside your general contractor, and every job is quoted as one flat price before we start. California C36 license #1090862.
- Plumbing in Marin County since 2017
- California C36 plumbing license #1090862
- 5.0 stars from 89 reviews, as of October 2026
What's included
Included in every remodel
- A walkthrough of the layout and where each fixture is going
- Rough plumbing inside the walls, with all rough materials supplied by us
- Finish install of sinks, faucets, toilets, showers and appliances
- Working directly with your general contractor on timing
- One flat price for the plan we agree on
- A full test of every line before the job is done
Priced separately
- Fixtures you choose yourself. You're welcome to supply faucets, sinks and toilets; we supply anything that goes in the wall
- Layout changes after rough-in, quoted before we move anything
- Permits where the city requires them
- Moving or replacing a water heater, see water heater services
Price guide
| Job | Price |
|---|---|
| Site visit and layout review | $69 |
| Fixture swap during a remodel (sink, faucet, toilet, shower trim) | Flat rate, quoted per fixture |
| Bathroom rough-in and finish plumbing | Quoted from your plan |
| Kitchen rough-in and finish plumbing | Quoted from your plan |
| Laundry room plumbing | Quoted from your plan |
What moves the price: how far fixtures are moving from where they are now, whether drain lines have to be rerouted, and how many changes come after rough-in. Every price is flat rate, so the number we quote is the number you pay.
How it works
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Call us early
Before the walls are open is the best time. Bring your plan or your contractor's.
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We walk the layout
We look at where everything is going and flag anything that will cost more or cause trouble later.
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You get one price
A flat price for the plan. If the plan changes, the change is quoted before we move anything.
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We rough in and finish
Lines in the walls, then fixtures in, then every line tested.
What our job records show
15
Kitchen, bathroom and laundry remodel jobs since November 2025.
Those run from Larkspur and Fairfax to Woodacre and Nicasio. In San Anselmo this April, a kitchen remodel meant a new dishwasher with an air gap, a garbage disposal, an ice maker valve box with an air chamber, and a new kitchen faucet.
Glenn spent five years as a carpenter before he became a plumber. On a remodel that matters, because he knows what's behind your walls and how the framing will be affected before anything gets cut.
Who does the work
Glenn Lopes
Owner and C36 license holder. Started Big Island Plumbing in 2017 after five years as a carpenter and a six month UPC code course. Remodel layout is one of the things he's best at, and he works with a short list of general contractors he trusts.
Recent remodel reviews
Read all our reviews on GoogleWhere we plumb kitchen and bath remodels
Larkspur
Fairfax
Woodacre
Mill Valley
San Anselmo
Ross
Corte Madera
San Geronimo
Tiburon
Sausalito
Santa Rosa
We also take remodel work in Greenbrae, Kentfield, Belvedere, Nicasio and the rest of Marin County. See all service areas
Questions we get asked
Do you work with my general contractor?
Yes, and we prefer it. We coordinate timing with your GC so the rough-in, inspection and finish work happen in the right order. If you don't have a GC yet, call us and we'll talk it through.
Can I pick my own fixtures?
Yes. Faucets, sinks, toilets and shower trim are your call. We'd steer you to a plumbing supply house instead of a big box store, because the same model is often built differently. Anything that goes inside the wall, we supply.
What happens if we change the layout halfway through?
We quote the change before we move anything, so there are no surprises on the final bill. The earlier a change happens, the less it costs.
Do you do laundry rooms too?
Yes. We've installed laundry boxes, utility sinks and new supply and drain lines for laundry remodels.
How much does remodel plumbing cost?
It depends on how much is moving. Swapping fixtures in place costs far less than moving a sink or a toilet to a new wall. We walk the plan and give you one flat price before we start.
Are you licensed?
Yes. Big Island Plumbing holds California C36 plumbing contractor license #1090862. You can verify it on the Contractors State License Board site.
Related services
Planning a remodel? Call (415) 209-8142
Talk to us before the walls close up.