Plumbing work in Los Angeles homes covers a wide range — from kitchen and bathroom remodel rough-in to ADU plumbing systems, whole-home repipe projects, and new construction. The LA housing stock includes homes with galvanized steel pipes from the 1950s and 60s, original cast iron drain lines, and outdated fixture configurations that create real problems when homeowners start remodeling. Understanding what licensed plumbing work costs and how the permit process works in Greater LA helps you plan accurately and avoid surprises. APLA Construction (CA Lic #1136359) coordinates licensed plumbing on all full construction and remodeling projects across Greater Los Angeles.
ADU plumbing is more expensive than simple remodel work because it requires a complete new system — supply, drain, and often a new sewer lateral connection — rather than modifying an existing system.
Galvanized steel water supply pipes in older LA homes corrode from the inside, reducing water pressure and eventually leaking. A PEX repipe is the most common solution — faster to install than copper, flexible, and code-approved for residential use in California.
Plumbing permits are required for any work that modifies the supply, drain, or gas systems in an LA home. LADBS and all LA-area building departments require:
Cosmetic plumbing — replacing a faucet, shower head, or toilet with the same-location fixture — typically does not require a permit. Any work moving drain lines or supply lines does.
APLA regularly encounters these plumbing conditions in LA homes during remodels and construction:
Plumbing for a garage conversion ADU in Los Angeles typically costs $6,000–$14,000 for a complete kitchen and bathroom system. A detached ADU requires running new sewer and water service from the main house to the new structure, bringing total plumbing costs to $10,000–$22,000. These costs are included in APLA’s comprehensive ADU project estimates.
A PEX repipe for a 1,500 sq ft home in Los Angeles costs $5,000–$10,000 installed including permits and inspection. Copper repipe costs 30–50% more. Repiping is done during a major remodel when walls are open, or as a standalone project where walls are opened and then repaired after pipe installation.
Yes. Water heater replacements require a permit in the City of LA and most surrounding cities. The inspection confirms proper venting, seismic strapping (required in California), gas connections, and pressure relief valve installation. APLA handles all permit coordination for water heater work as part of full project management.
PEX (cross-linked polyethylene) is a flexible plastic pipe approved for residential plumbing in California. It is faster to install than copper (no soldering), resistant to freezing and corrosion, and costs 30–50% less in labor and material. Copper is more durable long-term, fully recyclable, and some homeowners prefer it. Both are code-approved for LA homes. APLA uses both depending on the application and client preference.
Yes, in most cases. California law allows ADUs to connect to the existing sewer lateral without requiring a separate lateral, provided the existing lateral has adequate capacity. If LADBS determines the existing lateral is insufficient, a new or upgraded lateral is required. APLA evaluates sewer capacity at the site evaluation stage of every ADU project.
APLA coordinates plumbing as part of full construction and remodeling projects — we do not perform standalone emergency plumbing service calls. For full remodels, ADU projects, additions, and new construction throughout Greater Los Angeles, APLA manages licensed plumbing under one contract.
APLA coordinates all licensed plumbing work on remodeling, ADU, addition, and new construction projects throughout Greater Los Angeles — kitchens, bathrooms, whole-home repipes, and new ADU systems.
Call: (818) 818-4419
Email: info@aplaconstruction.com
CA General Contractor License #1136359
Serving Sherman Oaks, Studio City, Encino, Culver City, Pasadena, Glendale, Torrance, and all of Greater Los Angeles. Learn more about our plumbing services.