California's 2025 building codes became effective on January 1, 2026, replacing the prior code cycle. Most code updates never touch a homeowner's life. This one does. As of the new year, San Jose remodel and addition projects that involve structural modifications or add significant weight can require a mandatory seismic assessment during plan check. In plain terms: before the city approves your permit, a structural engineer may need to show that your house can still handle earthquake loads after the change you're proposing.
If you're wondering why your 2026 permit is moving slower and costing more than a friend's nearly identical project did two years ago, this is a big part of the answer. Here is what the review is, what sets it off, what it realistically adds, and how a contractor who deals with it every week keeps it from derailing your project.
- Since January 1, 2026, San Jose remodels and additions that change structure or add significant weight can trigger a mandatory seismic review during plan check.
- On affected projects, plan on roughly 2 to 3 extra weeks for permit approval and roughly $1,800 to $3,500 for structural engineering, as a general market range.
- Industry reporting estimates about 65% of bathroom renovations with structural changes are affected, driven by added weight (tile, stone, tubs) and layout changes.
- Cosmetic-only work usually does not trigger it, and simple non-structural electrical or plumbing permits can still clear in about 1 to 5 business days.
What changed on January 1, 2026
California updates its building codes on a three-year cycle, and the 2025 codes took effect statewide at the start of this year. Within that update, San Jose's plan-check process now applies a seismic assessment requirement to remodels and additions that modify the structure or add meaningful dead load to the building.
The logic is simple. San Jose sits in earthquake country, and a remodel that removes a load-bearing wall or piles new weight onto an old frame changes how the house behaves in a quake. The city now wants a structural engineer's stamp confirming the modified building still performs, before the permit is issued rather than after a problem shows up.
For homeowners, that means one more professional in the loop, one more set of calculations in the permit package, and a longer plan-check queue. None of it is optional on affected projects, so the smart move is to plan for it from day one.
This is a review, not a retrofit
One point of confusion worth clearing up early: the seismic review is not the same thing as a seismic retrofit. A retrofit is physical construction work, typically bolting the house to its foundation and bracing the cripple walls in the crawlspace. It's something you hire a crew to build.
The 2026 seismic review is a paperwork and engineering step during plan check. An engineer evaluates your proposed structural changes, runs the numbers, and documents that the house remains sound. Most of the time the review ends there. Occasionally it concludes that some strengthening is needed as part of the project, and in that case the two topics meet. But if you've heard both terms and assumed they were one thing, they aren't: one is analysis required for your permit, the other is bolts and plywood under your house.
What triggers the review, and what doesn't
Based on how the requirement is being applied, these are the common triggers:
- Removing or altering a load-bearing wall. The classic open-concept conversion is now squarely in review territory.
- Additions and second stories. New square footage means new loads on the existing structure and foundation.
- Significant added dead load. Heavy finishes and fixtures: stone slabs, thick tile assemblies, oversized soaking tubs.
- Some bathroom and kitchen projects with structural changes. Industry reporting estimates the review touches about 65% of bathroom renovations that involve structural changes, because bathrooms combine added weight with layout changes that move walls and plumbing.
And what usually does not trigger it: cosmetic-only work with no structural change. Paint, cabinet swaps, counter replacement on existing framing, fixture-for-fixture updates. Simple non-structural electrical and plumbing permits are also unaffected and can still clear in about 1 to 5 business days.
The line between "cosmetic" and "structural" is where projects get mis-scoped. A bathroom refresh that keeps every wall in place is one animal. The same bathroom with a wall moved two feet and a 700-pound tub added is another. Deciding which side of the line your project sits on, before you submit, is half the battle.
What it adds to your timeline
On affected projects, the seismic review adds roughly 2 to 3 weeks to permit approval. That's time for the engineering to be produced, packaged with the plans, and worked through the city's plan-check queue.
You can see the effect in the citywide numbers. San Jose bathroom permit approvals now run about 6 to 7 weeks in 2026, up from about 4 to 5 weeks in 2024, and the seismic review is a meaningful part of that stretch. If your contractor is still quoting you 2024-era permit timelines, that's a yellow flag. We keep a current read on the process on our remodeling permits page.
There is a lever available: San Jose offers an expedited plan review program for an added fee, which can cut review time by roughly 30 to 50%. Whether it pencils out depends on your project. If you're paying rent or carrying a loan while you wait, buying back two or three weeks often makes sense. If the start date is flexible, save the fee.
What it adds to your budget
The direct new cost is the structural engineering: roughly $1,800 to $3,500 on affected projects, based on general market ranges reported for San Jose. Where you land in that range depends on complexity. A single beam calculation for one removed wall sits at the low end; an addition with new foundations and multiple modified walls sits at the top.
Treat those figures as ballpark, not a quote. Engineering is priced per project, and city permit fees are their own separate line, published on the San Jose building permit fee schedule. On a bathroom project, the engineering typically lands as a modest single-digit percentage of the total budget; you can see how it fits into the bigger picture in our bathroom remodel cost guide. And if the added soft costs stretch the budget, remodel financing can spread them across the project rather than piling them onto the deposit.
How to keep a 2026 remodel on schedule
The review only wrecks timelines when it's a surprise. A few habits keep it boring:
- Settle the structural scope early. Decide up front whether walls move or heavy finishes go in, so the permit package is engineered once, not revised mid-review.
- Bring the engineer in before submission. Submitting without the assessment and getting bounced by plan check costs far more time than doing it right the first time.
- Decide on expedited review at kickoff. It's a known fee for a known time saving; make it a deliberate choice, not a panic buy in week five.
- Bundle structural work. If the review surfaces a weakness, or you've been putting off a retrofit, folding it into the open-walls phase of the remodel is the cheapest access you will ever have.
How we handle it
We build this requirement into every affected project from the first site visit. We flag whether your scope triggers the review, bring in the structural engineer, assemble the permit package, walk it through San Jose plan check, and schedule the inspections, so it's one managed process instead of three vendors pointing at each other. The 2 to 3 weeks is in the schedule you see on day one, not discovered in month two. You can see how that fits into a full project on our process page.