The plumbing contractor the Peninsula builds with.
Ground-up rough-ins, tenant improvements, water heaters and leak detection — engineered to code, documented, and finished on schedule.
One contractor for the building and the house.
Most shops pick a lane. We run a commercial division that works to GC schedules and a residential division that works to homeowners' — with the same crews, standards and documentation behind both.
Commercial
Facilities, build-outs and maintenance contracts
Sewer and main line clearing, backflow certification, commercial boilers, grease interceptors, tenant improvements and trenchless rehabilitation.
- Tenant improvements
- Backflow certification
- Maintenance contracts
- Emergency dispatch
Residential
Repairs, upgrades and ground-up homes
Leak detection, tankless and heat pump water heaters, repiping, drain clearing, water treatment, fixture work and full rough-ins for new builds and ADUs.
- Leak detection
- Water heaters
- Repiping
- New construction
What we get called for.
Electronic Leak Detection
Acoustic and thermal location of concealed slab and wall leaks before anything gets opened up.
- Slab leak acoustic pinpointing
- Thermal imaging inspection
- Repair restoration plan
Tankless & Heat Pump Water Heaters
Condensing tankless and hybrid heat pump systems sized for the property, not the box.
- High-efficiency unit sizing
- Annual descaling service
- Rebate-eligible installs
Drain Cleaning & Camera Work
Kitchen, bath and main line clearing, verified on camera rather than assumed.
- Hair, soap and root clearing
- Sewer line video diagnostics
- Preventive maintenance
Sewer & Trenchless Replacement
CIPP epoxy lining and pipe bursting that spares the driveway, slab and landscaping.
- Camera diagnostics and logs
- Minimal structural disruption
- 50-year material lifespan
Copper & PEX Repiping
Galvanized and failing lines replaced with type-L copper or PEX-a, patching included.
- PEX-a expander systems
- Minimal wall access design
- Drywall repair and patching
Gas Lines & Seismic Valves
Gas routing, leak testing and appliance hookups, including seismic shutoff valves.
- Seismic gas shutoff valves
- Remodel gas routing
- Leak detection and testing
Water Softening & Filtration
Scale and mineral control to protect heaters, fixtures and appliance runs.
- Carbon filter media tanks
- Scale prevention softeners
- Reverse osmosis systems
New Construction & ADUs
Ground-up rough-ins, additions and second units, coordinated with the GC and inspector.
- Underground and slab rough-in
- ADU and addition plumbing
- Permit and inspection support
Photographed on the job, not bought from a stock library.
Every image below is a Daso crew on a Peninsula property. Rough-ins, manifolds, heat pumps and repipes — the parts of the job that get covered up before anyone sees them.
No surprises between the estimate and the invoice.
The part most people dislike about hiring a plumber is not knowing what it will cost or when it will be done. This is the sequence on every job, residential or commercial.
Walk the job
A licensed plumber — not a salesperson — looks at the actual conditions and tells you what the work involves.
Scope and price it
You get a written scope and a fixed price before anything starts. If conditions change, you hear it before we proceed.
Install to code
Permitted where required, inspected where required, and built to California code the first time.
Document and hand off
Photos of every diagnostic, layout and completed repair, delivered as a record you can file or forward.
What you are actually buying.
Plumbing is bought on trust, so here is the paperwork behind it. Every claim on this page can be checked before you hire us.
License
California State License #1037326, Class C-36, in active standing and verifiable through the CSLB.
Bonded & insured
Contractor bond in place through a licensed surety, plus commercial and residential liability coverage.
Code compliance
Work performed to California building code and municipal protocol, with permits pulled where the scope requires them.
Photo documentation
Every diagnostic, pipe layout and completed repair is photographed and logged — useful for facility files and insurance.
Built for facilities and the people who manage them.
Property groups and general contractors get response windows, code filing, and a photo record of every job for their files.
Sewer & Main Line Clearing
Heavy-duty rooter clearing and optical inspection for facilities, hotels and retail.
Explore →Backflow Testing & Certification
Annual certification, repair and filing with the local water authority.
Explore →Commercial Boilers & Manifolds
High-capacity boilers and multi-unit tankless manifolds, configured and serviced.
Explore →Grease Trap & Interceptor Service
Clearing, resealing and replacement to keep kitchens off the violation list.
Explore →Tenant Improvements & Build-Outs
Rough-in and remodel work for offices, restaurants and warehouse conversions.
Explore →Trenchless Pipe Rehabilitation
Epoxy lining that replaces failing laterals without tearing up the lot.
Explore →Sixteen cities, one crew base.
We run out of Belmont, which puts every city we serve inside a short drive — the difference between a same-day look and a next-week appointment. Each city page covers the building stock, permitting and water conditions specific to that jurisdiction.
Belmont, CA 94002
Sixteen Peninsula cities, all within a short drive of the yard — Atherton and Hillsborough to the north, Santa Clara and San Jose to the south.
What people say after the work is done
Daso handled the entire commercial rough-in for our restaurant build-out in Burlingame on time and passed municipal inspection on the first pass. Clean lines, zero drama, and fair pricing.
Replaced our failing 75-gallon tank with a Navien condensing tankless system in Palo Alto. They pulled the city permit, upgraded the gas line, and left the mechanical room cleaner than they found it.
We had an underground slab leak that two other companies couldn't locate without tearing up tiles. Daso used acoustic detection to pinpoint the exact failure and routed overhead PEX with minimal disruption.
Get a real number from a licensed plumber.
Send the scope, the address, or just the problem. A licensed plumber reviews it and comes back with a written price — not a range.