Most people don’t think about what’s holding up their building until the ground starts shaking. In Los Angeles, that moment of realization often comes too late. If you own a multi-unit residential building built before 1978, especially one with tuck-under parking or large openings on the ground floor, you’re sitting on a soft-story structure. That term—soft-story—gets thrown around a lot in city ordinances and contractor bids, but what it really means is that your first floor is weaker than the ones above it. And in a major seismic event, that weakness can cause the building to collapse sideways.
We’ve seen these buildings firsthand. The classic scenario is a three-story apartment complex over a parking garage. The upper floors are stiff, but the ground floor has nothing but skinny columns holding everything up. When the ground moves, those columns can’t handle the lateral force. The city knows this. That’s why Los Angeles passed Ordinance 183893, mandating that thousands of these buildings be retrofitted. But knowing you need to do something and actually figuring out what to do are two very different things.
Key Takeaways
- Soft-story retrofits are legally required for many pre-1978 buildings in L.A. with tuck-under parking or similar ground-floor weaknesses.
- The most common solution involves adding steel moment frames or shear walls, but the right approach depends on your building’s specific layout and soil conditions.
- Expect the process to take 6–18 months from engineering to final sign-off, with costs ranging from $80,000 to $200,000 per building depending on complexity.
- Ignoring the mandate can lead to fines, liens, and liability issues, but rushing into a cheap fix often creates bigger problems later.
Table of Contents
What a Soft-Story Retrofit Actually Does
Let’s clear up a common misunderstanding right away. A retrofit doesn’t make your building earthquake-proof. Nothing is earthquake-proof. What it does is prevent a specific failure mode—the collapse of the soft story. The engineering goal is to redistribute lateral forces so the ground floor can move with the rest of the building rather than pancaking.
The typical approach involves installing steel moment frames. These are essentially rigid steel beams and columns that bolt into the existing concrete or masonry. They create a path for seismic energy to travel through the building without concentrating all the stress on those weak columns. Another option is adding shear walls—thick reinforced concrete or plywood walls that stiffen the ground floor. But shear walls can be a nightmare if you’re trying to preserve parking spaces or open floor plans.
We’ve worked on buildings where the owner wanted to keep every single parking spot. That’s a common request in L.A., where parking is gold. But the reality is, you’re going to lose some square footage. The question is how much. A good structural engineer can minimize the impact, but you have to accept that trade-off upfront.
The Engineering Assessment Nobody Talks About
Before you even price out steel, you need a structural evaluation. This isn’t the same as a home inspection. A structural engineer will look at your building’s original plans—if they exist—and assess the existing columns, foundations, and connections. They’ll also check the soil type. Why does soil matter? Because soft soil amplifies seismic waves. Buildings in the San Fernando Valley, for example, often sit on alluvial soil that behaves differently than the bedrock found in the Hollywood Hills.
We’ve seen owners skip this step and go straight to a contractor who promised a cheap fix. That never ends well. One client in Silver Lake had a contractor pour a concrete shear wall without checking the existing foundation. The wall cracked within a year because the foundation couldn’t support the load. They ended up spending twice as much to tear it out and start over.
The Permit Process Is Not Optional
Los Angeles Department of Building and Safety (LADBS) has a specific plan-check process for soft-story retrofits. You can’t just hire a framer and start welding. The city requires stamped engineering drawings, calculations, and a detailed scope of work. And here’s the kicker: once you submit, the review can take months. We’ve seen plan checks sit for 12 to 16 weeks before anyone even looks at them.
Part of the delay is that the city is overwhelmed. There are thousands of buildings on the compliance list, and the engineering review division is understaffed. If your drawings aren’t perfect, they get kicked back. Common mistakes include missing foundation details, incorrect bolt spacing, or failure to account for existing utilities that conflict with new frames.
One practical tip: hire an engineer who has done soft-story work in L.A. specifically. Not just any structural engineer. Someone who knows the local plan-checkers and what they look for. That experience can save you two or three rounds of revisions.
When the Solution Doesn’t Fit
Not every building is a good candidate for steel moment frames. Older buildings with unreinforced masonry (URM) walls present a different challenge. URM buildings have their own retrofitting requirements under state law, and combining a soft-story fix with a URM upgrade gets complicated fast. We’ve advised owners in that situation to consider a full structural redesign rather than piecemeal fixes.
Another scenario where the standard approach fails is when the building has a basement. Retrofitting a soft story above a basement means the new frames have to tie into the basement walls, which often requires additional excavation and shoring. That drives up costs and timeline. In those cases, we’ve recommended adding exterior frames instead, which avoids the basement issue but changes the building’s appearance.
Cost Realities You Need to Budget For
Let’s talk money. The range we gave earlier—$80,000 to $200,000—is a rough average. But we’ve seen bids as low as $50,000 for a simple two-story building with easy access, and as high as $350,000 for a four-story building on a tight lot in West Hollywood. Here’s a realistic breakdown of where that money goes:
| Cost Component | Typical Range | Notes |
|---|---|---|
| Structural engineering & plans | $8,000 – $25,000 | Depends on building complexity and number of revisions |
| Permitting & plan check fees | $3,000 – $8,000 | City fees plus any expediting services |
| Steel moment frames (material & labor) | $40,000 – $120,000 | Largest variable; driven by steel prices and welding requirements |
| Foundation work (excavation, concrete) | $15,000 – $40,000 | Required if new footings are needed |
| Tenant relocation (if required) | $0 – $30,000 | Only if units are occupied during construction |
| Inspection & final sign-off | $2,000 – $5,000 | City inspections and testing of welds/bolts |
The biggest hidden cost is tenant relocation. If your building is occupied, you may need to move people out during construction—especially if the work involves cutting into floors or walls inside units. L.A. rent control laws add another layer. You can’t just evict tenants for construction unless you follow specific procedures. We’ve seen owners get hit with relocation fees of $10,000 per unit or more.
Common Mistakes We See Over and Over
After a decade of doing this work, certain patterns emerge. The most common mistake is underestimating the timeline. Owners think they can get it done in three months. Realistically, from the first engineering visit to the final city sign-off, you’re looking at 9 to 18 months. The construction itself might only take 6 to 8 weeks, but the permitting and inspection phases eat up the rest.
Another mistake is choosing the cheapest contractor. We’re not saying you need the most expensive one, but structural steel work is unforgiving. Bad welds, improper bolt torques, or incorrect frame alignment can all lead to a failed inspection. And if the city flags your work, you have to fix it before you can continue. That means delays and change orders. We’ve seen projects where the contractor cut corners on welding inspection reports, and the city made them X-ray every single weld. That added two months and $15,000.
When to Call a Professional Instead of DIY
We get calls from landlords who want to manage the retrofit themselves. They think they can act as their own general contractor. In theory, you can. In practice, it’s a nightmare. You need to coordinate with the structural engineer, the steel fabricator, the welders, the concrete crew, the city inspectors, and possibly an expediter. One misstep in scheduling can delay the entire project.
If you own one or two buildings, hire a general contractor who specializes in seismic retrofits. The markup is worth it for the coordination alone. If you own a portfolio, you might consider bringing on a project manager who understands L.A. building codes. But for most owners, the DIY route ends up costing more in the long run due to mistakes and delays.
The Local Reality of Retrofitting in Los Angeles
Los Angeles isn’t just one city—it’s a collection of neighborhoods with different building stock and seismic risks. A soft-story building in Santa Monica might have different soil conditions than one in Koreatown. The age of the building also matters. Structures built in the 1920s often have different column spacing and foundation types than those built in the 1960s.
We’ve done retrofits near MacArthur Park, where the buildings are older and the soil is soft. Those projects required deeper foundations and more steel. In contrast, a building in the San Fernando Valley near the 101 freeway might have better soil but older concrete that’s harder to drill into. Every building is its own puzzle.
One thing that surprises many owners is that the retrofit can actually improve the building’s value. Not just for safety, but for insurance. Some insurers now offer discounts for retrofitted buildings. And if you ever sell, a certificate of compliance from LADBS is a strong selling point. Buyers are starting to ask for it, especially after the 1994 Northridge earthquake and the more recent Ridgecrest quakes.
How We Approach a Retrofit at D&D Home Remodeling
We don’t believe in one-size-fits-all solutions. When a client comes to us, we start with a site walkthrough. We look at the existing columns, check for any previous modifications, and talk to the tenants if the building is occupied. Then we bring in a structural engineer we’ve worked with before—someone who knows the LADBS plan-check process inside out.
From there, we develop a scope that balances cost, timeline, and disruption. If the building has rent-controlled units, we plan the work to minimize tenant impact. That might mean doing the steel installation in phases or working during off-hours. We’ve even done retrofits where we installed exterior frames to avoid entering units entirely.
The goal isn’t just to pass inspection. It’s to give the owner a building that’s genuinely safer, with documentation that holds up under scrutiny. And we’ve learned the hard way that cutting corners on the front end creates problems down the road.
When a Retrofit Might Not Be the Answer
There are situations where a full soft-story retrofit isn’t the best move. If your building is already slated for demolition or a major renovation, it might make more sense to incorporate the seismic work into a larger project. Retrofitting a building that’s going to be gutted anyway is wasteful.
Another case is when the building has severe structural issues beyond the soft story. If the foundation is crumbling or the concrete is delaminating, you need to address those problems first. A retrofit on a failing structure is like putting a Band-Aid on a broken leg.
We’ve also advised owners to sell rather than retrofit if the cost exceeds 30% of the building’s value. In some parts of L.A., the math just doesn’t work. The city offers some financial assistance programs, but they’re limited and competitive. For most owners, the retrofit is a necessary expense, not an investment.
Final Thoughts on Moving Forward
If you own a soft-story building in Los Angeles, the clock is ticking. The city has extended deadlines before, but they’re getting stricter. Fines can reach thousands of dollars per month for non-compliance. More importantly, the liability of owning an unretrofitted building in a seismic zone is real. If a quake hits and your building collapses, you’re looking at lawsuits, insurance claims, and potential criminal liability.
The smart move is to start the process now. Get a structural engineer out for an assessment. Talk to a contractor who has done this work. Don’t wait until the city sends you a notice or until the ground starts shaking.
At D&D Home Remodeling, we’ve seen what happens when owners delay. We’ve also seen the peace of mind that comes from a properly retrofitted building. It’s not a glamorous project, but it’s one of the most important investments you can make in your property. If you’re in the Los Angeles area and need guidance, reach out. We’ve been through this process more times than we can count, and we’re happy to help you navigate it.
