
Bathroom Remodeling
Bathroom Remodeling in Newport Beach, CA
Bathroom Remodeling in Newport Beach, CA
Bathrooms are small rooms with a lot happening behind the walls. Supply and drain lines, waterproofing, ventilation, electrical and tile all have to be right, because mistakes show up later as leaks and moisture damage. Siemonsma Construction runs bathroom remodels as the general contractor, from design coordination and permits through construction and the final walkthrough.
Why Siemonsma Construction
- Licensed and bonded general contractor
- More than 40 years of construction experience
- Design through build managed by one contractor
- Based in Newport Beach, California
Scope
What the Work Can Include
- Primary, guest and powder bathroom remodels
- Shower and tub replacement, including tub-to-shower conversions
- Waterproofing, tile and stone installation
- Plumbing and electrical updates, lighting and ventilation
- Vanities, cabinetry and countertops
- Layout changes and accessibility improvements
How it works
From Design To Build
- 01
Consultation and scope
We look at the existing bathroom with you, including what can be seen of the plumbing, ventilation and subfloor, and agree on what is changing: fixtures only, a new layout, or a full rebuild of the room.
- 02
Design and selections
Tile, stone, fixtures, vanities and lighting are chosen before work starts, with your interior designer or one of the designers we work with. Settled selections keep the job moving once the room is opened up.
- 03
Permits and scheduling
Changes to plumbing, electrical, ventilation or walls generally require a permit. We handle the application and city coordination, then schedule the trades in the order the work has to happen.
- 04
Construction and walkthrough
Demolition, rough plumbing and electrical, inspections, waterproofing, tile, then fixtures and finishes. We finish with a walkthrough and a punch list, and complete the list before closing out the job.
FAQ
Frequently Asked Questions
Often, yes. Work that alters plumbing, electrical, ventilation or walls generally requires a permit from the city's building department, while purely cosmetic work such as painting generally does not. We confirm what your scope requires and handle the application and inspections.
If the home has another bathroom, most people stay. If it is the only bathroom, raise that at the first meeting, because it affects how the work is sequenced and whether you will want to stay elsewhere for part of it.
Older bathrooms can hide water damage, outdated wiring or drain lines that need replacing, and none of it is visible until demolition. In California, a change to a home improvement contract has to be put in writing as a change order, so any added work is described and agreed before it proceeds.
Cost follows scope: whether fixtures stay where they are or move, how much tile and stone is involved, and the fixtures and finishes you select. We do not publish price ranges. Contact us about your bathroom and we will prepare an estimate from a defined scope.
More services
Other Services

Kitchen Remodeling
A kitchen remodel involves more trades than any other room in the house: demolition, framing, plumbing, gas, electrical, ventilation, cabinetry, countertops, tile and finish carpentry. Siemonsma Construction manages that work as the general contractor, from coordinating the design and handling permits through to the final walkthrough, so one company is responsible for the sequence and the result.
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Whole-Home Remodeling
A whole-home remodel is closer to building a house than to updating a room. Structure, mechanical systems, layout and finishes are all in play at once, and the order in which the work happens matters. Siemonsma Construction is a general contractor with more than 40 years of experience in custom remodels and new construction, and manages each project from the first plans through the final walkthrough.
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Custom Homes & New Construction
Building a new home means coordinating an architect, engineers, the city, utility companies and many trades over a long schedule. New construction is part of Siemonsma Construction's work as a general contractor: we work with the design team during planning, handle permit applications and approvals, and run the project from groundbreaking to the final walkthrough.
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Ready to Talk About Your Project?
Building isn’t just construction – it’s a collaboration. Tell us what you have in mind.
