Opening up your floor plan in Simi Valley costs anywhere from $5,000 to $50,000 or more — depending almost entirely on one question: is that wall load-bearing or not?
That single factor drives the biggest cost difference in any floor plan remodel. A non-load-bearing wall can come down for $1,000 to $3,000. A load-bearing wall that needs a structural steel beam and engineer sign-off runs $5,000 to $15,000 or more before you touch a single finish.
We’ve done dozens of open floor plan conversions across Ventura County — in Simi Valley, Thousand Oaks, Moorpark, and Camarillo. This guide gives you the real numbers so you know what you’re looking at before you pick up the phone.
Want a quick estimate for your specific home? Try our free cost calculator — it takes 2 minutes and gives you a real price range without a contractor visit.
Load-Bearing vs. Non-Load-Bearing Walls: The Number That Matters Most
Before anything else gets priced, we determine what type of wall you’re removing. This is not a DIY determination — it requires pulling permits and having a structural engineer or licensed contractor evaluate the wall.
Non-Load-Bearing Wall Removal
Cost: $1,000–$3,000
A non-load-bearing wall carries no structural weight from the floors or roof above. Once it’s confirmed non-load-bearing, removal is straightforward: demo the drywall, pull the studs, patch the ceiling and floor, repair the drywall on both sides.
The cost range depends on wall length, what’s running inside the wall (electrical, plumbing, HVAC vents), and finish work. A short, clean wall with nothing inside it runs toward the low end. A longer wall with a few electrical outlets and a light switch runs toward $2,500 or higher.
Load-Bearing Wall Removal
Cost: $5,000–$15,000+
A load-bearing wall carries real structural load. Removing it without replacing that support creates a safety hazard and will fail any future home inspection. The fix is installing a beam — either a wood LVL (laminated veneer lumber) beam or a steel I-beam — that spans the opening and transfers the load to the existing structure.
The beam itself runs $800 to $3,500 depending on span and material. Add labor for temporary shoring, beam installation, structural engineer fees ($500–$1,500), permits, drywall patching, and finishing — and a load-bearing wall removal in Ventura County typically costs $5,000 to $10,000 for a standard opening, and $12,000 to $15,000+ for larger spans with heavy load paths.
Common Open Floor Plan Projects in Simi Valley — With Costs
Most open floor plan remodels in Ventura County fall into one of four configurations. Here’s what each typically costs.
1. Kitchen-to-Dining Room Wall Removal
Cost: $3,000–$12,000
This is the most common request we get. Homes built in the 1970s through 1990s in Simi Valley were designed with separate kitchen and dining rooms. The wall between them is usually non-load-bearing, which keeps costs reasonable.
The finished product feels immediately larger and allows natural light to flow through both spaces. Homeowners almost universally describe this as one of the highest-impact changes they’ve made for the cost.
If the wall is load-bearing — which happens in some ranch-style homes where that wall is aligned with a ridge beam — expect the cost to jump to the $8,000–$12,000 range.
2. Kitchen-to-Living Room Opening
Cost: $6,000–$20,000
The kitchen-to-living room wall is more often structural. In many Ventura County homes, this wall runs parallel to the ridge of the roof or aligns with a load path from the second floor — which means load-bearing status is more likely.
Even when it’s load-bearing, this is the most-requested open floor plan change we do. The transformation is dramatic: cooking, dining, and living all happen in one connected space. In Simi Valley’s resale market, open-concept kitchen-living configurations consistently attract more buyer interest than closed floor plans.
3. Multiple Wall Removal for a Great Room
Cost: $15,000–$35,000
Some homeowners want the full open concept — removing two or three walls to combine kitchen, dining, and living into a single great room. This scope almost always involves at least one load-bearing wall, and often two.
The structural engineering for a multi-wall removal is more involved: the engineer needs to trace all load paths and ensure the beam sizing accounts for combined loads. For a 1,800–2,400 sq ft home in Simi Valley or Thousand Oaks, a full great room conversion typically runs $18,000 to $28,000.
4. Kitchen Island After Wall Removal
Cost: Add $5,000–$18,000 to the wall removal
Many homeowners use the wall removal as the catalyst to add a kitchen island — especially when the wall between kitchen and dining room comes down, creating new floor space. A simple 4-foot island with butcher block top and basic cabinetry runs $5,000–$8,000. A full 8-foot island with quartz countertop, seating overhang, and prep sink runs $12,000–$18,000.
Permits in Simi Valley and Ventura County
Wall removal always requires a permit in Simi Valley. This is not optional and is not a gray area.
The City of Simi Valley requires a building permit for any structural modification, including wall removal. For non-load-bearing walls, the permit is typically a simple over-the-counter building permit. For load-bearing walls, you’ll need a structural engineer’s stamped drawings before the permit will be issued.
We handle permits on every project — we file the application, coordinate the engineer’s drawings when needed, and schedule the inspections. The permit fee in Simi Valley for a wall removal typically runs $200–$600. Engineering fees, if required, are separate.
Thousand Oaks and Moorpark have similar processes through their respective building departments. If you’re in unincorporated Ventura County — parts of Oak Park, Newbury Park, or east of Moorpark — permits go through the County of Ventura.
Do not let any contractor suggest skipping the permit. Unpermitted structural work creates real legal and financial exposure: it can kill a sale, void your homeowner’s insurance claim, or require you to open walls and redo work later. We’ve been doing this for 20+ years in Ventura County. The permit is always worth it.
Hidden Costs of Opening a Floor Plan
The wall removal cost is just the starting point. Most open floor plan projects have at least two or three of these additional items.
Electrical Rerouting — $500–$3,500
Most interior walls have electrical running through them — outlets, switches, and circuits. When the wall comes out, those circuits need to be rerouted and brought up to current code.
Plumbing Relocation — $1,500–$6,000
If there’s a sink, dishwasher, or gas line in or near the wall being removed, the plumbing needs to be relocated. This is the highest-cost hidden item and the one homeowners are most surprised by.
HVAC Adjustments — $800–$2,500
Many interior walls have supply or return air vents. When those walls come out, the HVAC system may need duct rerouting or rebalancing. Opening two rooms into one also changes the thermal load.
Flooring Transitions — $1,500–$6,000
In older Simi Valley homes, the kitchen and living room often have different flooring. Once the wall comes down, you have a seam where two materials meet. Many homeowners use this project as the opportunity to run consistent flooring throughout — which gives the open concept a cohesive, finished look.
Ceiling Patching — $500–$2,000
After the wall comes out, the ceiling line needs to be patched, textured to match, and painted. If a beam is exposed or wrapped in drywall, the ceiling work increases.
ROI: Does Opening a Floor Plan Add Home Value?
Yes — consistently, in the Ventura County market.
Buyers in Simi Valley, Thousand Oaks, and Camarillo actively search for open floor plans. Homes with closed, compartmentalized layouts tend to sit longer and sell for less per square foot than comparable homes with open configurations.
Open floor plan conversions in Southern California typically return 60–80% of the project cost in added home value at resale. That number climbs when the conversion is combined with a kitchen update, because buyers perceive the open kitchen-living space as a premium feature.
For a homeowner in Simi Valley planning to sell in 3–5 years, a $15,000 open floor plan conversion often adds $10,000–$18,000 in appraised value and meaningfully shortens time on market. For a homeowner who plans to stay, the day-to-day quality-of-life improvement — more light, more connection between spaces, easier entertaining — is the real return.
Getting an Estimate for Your Open Floor Plan Project
Every floor plan project is different. The cost depends on what’s in the wall, what’s behind it, how long the span is, and what you want to do with the space once it’s open.
The fastest way to get a ballpark is our free cost calculator. Answer 5 questions about your project and get a real price range in about 2 minutes — no contractor visit, no sales call.
If you’re ready to talk through your specific layout, call us at (805) 222-6544. We’ve been remodeling homes in Simi Valley and Ventura County for over 20 years, we’re licensed (#1066117), and we hold a 5.0-star rating on Google. We’ll tell you straight whether the wall is likely load-bearing, what it will take to open it, and what the full project cost looks like.
Frequently Asked Questions
How do I know if my wall is load-bearing?
There are some indicators — a wall that runs perpendicular to floor joists, sits above a beam in the crawl space, or aligns with a wall directly below it on a different floor is more likely to be load-bearing. But the only reliable way to confirm is to have a licensed contractor or structural engineer evaluate it. We assess load-bearing status on every project before providing a firm quote.
Do I need a permit to remove a wall in Simi Valley?
Yes. The City of Simi Valley requires a building permit for wall removal, regardless of whether the wall is load-bearing. Load-bearing walls also require stamped structural drawings from a licensed structural engineer. We handle the permit process on every project.
Can I remove a load-bearing wall and still have an open ceiling?
Both options work structurally. A flush beam — installed inside the ceiling joists so the ceiling remains flat — is more expensive because it requires more structural work and ceiling modification. An exposed beam, wrapped in drywall or left as a visible architectural element, is more common and more cost-effective. Many homeowners in Simi Valley choose the exposed beam look and end up preferring it aesthetically.
How long does an open floor plan remodel take?
A non-load-bearing wall removal with finish work typically takes 1–2 weeks. A load-bearing wall removal with beam installation, permits, and finish work runs 3–5 weeks. Projects that combine wall removal with a kitchen remodel run 8–14 weeks total.
Will removing a wall affect my homeowner’s insurance?
As long as the work is permitted and passes inspection, it should not negatively affect your insurance. Unpermitted structural work is a different story — it can create gaps in coverage or affect a future claim. Always pull the permit.