If you are rebuilding after the Eaton Fire, plumbing is one part of a much larger project, but it comes with its own set of decisions that are easy to overlook until you are already mid-framing. Here is a practical checklist.
Confirm Your Permit Phase Before Scheduling Rough-In
LA County's rebuild process runs through two phases: Regional Planning review of your site plan, followed by Building and Safety's structural and code review, which ends with a Ready to Issue (RTI) permit. Rough-in plumbing needs to match the plan set reviewed in Phase 2, so scheduling ahead of that approval risks rework.
Decide On Tank Or Tankless Early
This decision affects gas line sizing and venting, which are easier to plan correctly during framing than to retrofit afterward. If you are considering tankless, confirm your gas line can support its BTU demand before rough-in locks in the routing.
Account For The New Fire Code's Sprinkler Requirements
California's updated Wildland-Urban Interface Code, effective January 1, 2026, requires fire sprinkler systems on many rebuilt homes. A sprinkler system changes water supply sizing and backflow prevention planning in ways a pre-fire home never had to account for, so confirm this scope with your contractor before plumbing rough-in locks in pipe sizing.
Know Your Like-For-Like Floor Area Allowance
In the Eaton Fire area specifically, like-for-like rebuild projects may increase floor area by up to 200 square feet or 10 percent, whichever is greater. Even a small increase can change fixture count enough to matter for supply line sizing, so it is worth locking in your final floor plan before rough-in rather than after.
Plan Fixture Selection Before Rough-In, Not After
Rough-in plumbing is placed based on where fixtures will sit and what connections they need. Choosing tile, a specific tub, or a particular faucet brand after rough-in is complete is one of the most common causes of costly rework we see on rebuild projects.
Coordinate Inspection Timing With Your Contractor
Rough-in has to be inspected and approved before insulation and drywall close the walls. Confirm this sequencing with your general contractor early so plumbing inspection does not become the item holding up your framing schedule.
What The New Fire Code Means For Your Plumbing
California's updated Wildland-Urban Interface Code, effective January 1, 2026, sets higher fire-resistant construction standards for every rebuild in the burn zone, including fire sprinkler requirements on many homes. A sprinkler system draws from the same water supply as the rest of the house, which changes pipe sizing calculations that a pre-fire home never had to account for.
Coordinating this with your plumber before rough-in locks in pipe sizing avoids the more expensive alternative: discovering during a later inspection that the supply line cannot support both household demand and a sprinkler system at the same time.
Where Altadena's Rebuild Actually Stands
As of December 2025, only a small fraction of the nearly 6,000 residential properties with significant fire damage had completed all rebuilding and repairs, and less than half of those owners had even applied for or received permits. Most of the burn zone has not broken ground yet, which means the plumbing rough-in phase covered in this checklist is still ahead of the large majority of Altadena rebuilds.
That timeline means there is real value in getting these plumbing decisions right the first time, since the volume of rebuild activity happening over the next couple of years will keep contractors and inspectors busy, and correcting a rough-in mistake later costs more time than getting it approved the first round.
Every rough-in, regardless of timeline pressure, still has to meet Uniform Plumbing Code (UPC) requirements for pipe sizing, materials, and venting, which is not a step that gets skipped even on an expedited like-for-like rebuild.
Common Questions
Can I make plumbing decisions before my Phase 2 permit is approved?
You can plan and select fixtures ahead of time, but actual rough-in work needs to match the plan set reviewed and approved in Phase 2 to pass inspection.
Do I need a separate contractor for plumbing, or does my general contractor handle it?
Most general contractors subcontract plumbing rough-in to a licensed plumber. We coordinate directly with your GC's schedule either way.
What happens if my rough-in does not match my approved plans?
It will fail inspection and require correction before the project can proceed, which is exactly why locking in fixture and system decisions before rough-in begins matters so much.
Are permit fees waived for fire rebuild homeowners?
LA County waives certain fees for qualifying owners who both owned and lived in the property before January 7, 2025. Confirm your specific eligibility with the county's permit center.
Can I increase my home's size during a like-for-like rebuild?
In the Eaton Fire area, like-for-like projects may increase floor area by up to 200 square feet or 10 percent, whichever is greater, which affects fixture count and pipe sizing planning.
The Bottom Line
Rebuild plumbing is not fundamentally different work than a normal installation, but the sequencing and permit coordination around it matters more than usual. Confirming these decisions early keeps your rough-in phase from becoming the reason your rebuild timeline slips, especially given how much rebuild activity is still ahead across Altadena over the next several years.
What To Confirm Before You Start Rough-In
- Your approved Phase 2 construction documents, since rough-in has to match the reviewed plan set exactly.
- Your general contractor's framing timeline, so plumbing rough-in is scheduled while walls are actually open.
- Whether your rebuild includes a fire sprinkler system, since that affects water supply sizing planned during rough-in.
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Related Services
Eaton Fire Rebuild Plumbing: Our Eaton Fire rebuild plumbing service covers this entire process end to end, coordinated directly with your general contractor's schedule.
Water Heater Installation & Replacement: The tank versus tankless decision above is exactly what our water heater installation and replacement service helps you work through before rough-in locks in.
This checklist applies directly to Altadena rebuild permits, since LA County's process and the Eaton Fire area's specific floor-area allowance are both Altadena-specific rules.
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