Open Concept Remodel Structural Engineering in Irvine: Complete 2026 Guide

Open concept remodel structural engineering in Irvine involves identifying load-bearing walls, designing replacement beams (steel wide-flange, LVL, or glulam), sizing headers for new openings, and modifying the lateral force resisting system to maintain seismic compliance under the 2022 California Building Code. Engineering plans for open concept remodels in Irvine cost $2,500 to $6,000 depending on the number of walls removed and structural complexity.

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Open concept living is the single most requested residential remodel in Irvine. Homeowners in neighborhoods like Woodbridge, Northwood, Turtle Rock, University Park, Westpark, and El Camino Real want to remove walls between their kitchens, dining rooms, and living rooms to create spacious, light-filled living areas that match how families actually use their homes in 2026.

This guide is part of our residential structural engineering guide, covering the structural engineering requirements specific to open concept remodeling projects in Irvine.

The challenge: many of those interior walls are load-bearing. They carry the weight of the roof, upper floors, or both. Removing a load-bearing wall without proper structural engineering is dangerous — it can cause ceiling sag, floor deflection, cracked drywall, stuck doors, and in extreme cases structural failure. The Irvine Community Development Department (949) 724-6000 requires stamped structural plans from a California-licensed Professional Engineer (PE) for any wall removal that affects the building's structural system.

AAA Engineering Design has completed 200+ open concept remodel projects across Irvine and Orange County. Our structural engineers identify which walls are load-bearing, design replacement beams and headers to carry the loads, modify the shear wall system as needed, and produce plans that pass Irvine plan check. Call **(949) 981-4448** for a same-day consultation.

For a broader look at structural engineering in Irvine, see our structural engineering design in Irvine guide.

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Determining whether a wall is load-bearing is the first and most critical step in open concept remodel engineering. A load-bearing wall carries gravity loads from above — roof rafters, ceiling joists, upper floor joists, or a combination. Removing it without providing an alternate load path causes structural failure.

**Original Plan Review.** The most reliable method. AAA Engineering Design obtains the original structural plans from the Irvine Community Development Department building records or from the homeowner. These plans show bearing wall locations, header sizes, and foundation layout.

**Framing Direction Analysis.** If original plans are not available, the structural engineer analyzes the direction of floor joists and roof rafters above the wall. Walls running perpendicular to the framing direction above are typically load-bearing. Walls running parallel to the framing direction above are typically non-bearing — but exceptions exist.

**Attic and Crawl Space Inspection.** The engineer inspects accessible attic space to verify roof framing configuration (rafters vs. trusses), bearing points, and load paths. For homes with crawl spaces (less common in Irvine, where slab-on-grade construction dominates), the engineer inspects the foundation for continuous footings under the wall — a strong indicator of bearing status.

**Physical Indicators.** Double top plates, continuous footings below, larger stud sizes (2x6 vs. 2x4), and proximity to the center of the floor span all suggest bearing wall status.

Irvine's housing stock is predominantly tract home construction from the 1970s through 2000s, built by major developers (Irvine Company, William Lyon Homes, Standard Pacific, Shea Homes). Common bearing wall patterns in these homes:

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When a load-bearing wall is removed, a beam must replace it to carry the loads. The structural engineer selects the beam material and size based on:

Steel is the go-to material for long spans and heavy loads in Irvine open concept remodels. Advantages:

Common steel beam sizes for Irvine open concept remodels:

| Span | Load Condition | Typical Steel Beam | |------|---------------|-------------------| | 10-14 ft | Roof only (single story) | W8x18 or W8x24 | | 14-18 ft | Roof only (single story) | W10x22 or W10x26 | | 10-14 ft | Floor + roof (two story) | W10x26 or W12x26 | | 14-18 ft | Floor + roof (two story) | W12x30 or W12x35 | | 18-24 ft | Floor + roof (two story) | W12x40 or W14x38 |

Steel beams require connection design per AISC 360 and, in Seismic Design Category D (all of Irvine), seismic detailing per AISC 341 if the beam is part of a moment frame.

**Cost impact**: Steel beams cost $15-$40 per linear foot for material plus $500-$1,500 for fabrication and installation, depending on size and complexity.

LVL is an engineered wood product made from thin wood veneers bonded with structural adhesive. LVL beams are the most popular wood beam option for Irvine open concept remodels:

Common LVL configurations:

| Span | Load Condition | Typical LVL Beam | |------|---------------|-----------------| | 8-12 ft | Roof only | (2) 1-3/4" x 11-7/8" LVL | | 12-16 ft | Roof only | (3) 1-3/4" x 11-7/8" LVL | | 8-12 ft | Floor + roof | (3) 1-3/4" x 11-7/8" LVL | | 12-16 ft | Floor + roof | (2) 1-3/4" x 14" LVL or (4) 1-3/4" x 11-7/8" LVL |

Glulam beams are used in Irvine open concept remodels where the beam is exposed as an architectural feature. Glulam offers:

**Flush beam**: The beam is recessed into the ceiling framing so the bottom of the beam is flush with the ceiling plane. This creates a clean, uninterrupted ceiling but limits beam depth to the available joist depth (typically 9-1/4" to 11-7/8" for TJI joists). Flush beams often require steel to achieve adequate capacity within the depth constraint.

**Drop beam**: The beam projects below the ceiling plane. This allows deeper beam sections (more load capacity, longer spans) but creates a visible soffit. Drop beams are acceptable in many Irvine open concept remodels when the beam depth is 2-4 inches — minimal visual impact with maximum structural efficiency.

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This is the aspect of open concept remodel engineering that many homeowners — and some contractors — overlook. When a wall is removed in an Irvine home, it is not just the gravity load path that is interrupted. If the wall contained structural sheathing (plywood or OSB nailed with a specific pattern), it was functioning as a shear wall — a critical component of the building's seismic resistance system.

The structural engineer for an Irvine open concept remodel must:

Shear wall compensation strategies include:

Portal frames are commonly used in Irvine open concept remodels where limited wall space remains after the bearing wall is removed. A portal frame consists of:

The structural engineer calculates the required number and location of portal frames to replace the removed shear wall capacity while maintaining the open floor plan that the homeowner desires.

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The Irvine Community Development Department requires building permits for any interior remodel that involves:

Irvine plan check for open concept remodels typically takes 2-3 weeks. The structural plan checker reviews beam sizes, connection details, shear wall modifications, and foundation adequacy at new point loads.

Structural inspections during construction: 1. Temporary shoring in place (before any wall removal) 2. Foundation modification (new footings at beam bearing points, if required) 3. Beam installation and connection hardware 4. Shear wall modifications (new sheathing, nailing, holdowns) 5. Final structural inspection

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Engineering fees for open concept remodel projects in Irvine:

| Scope | Typical Fee | |-------|------------| | Single wall removal (under 12 ft span) | $2,500-$3,500 | | Single wall removal (12-20 ft span) | $3,500-$4,500 | | Multiple wall removal (2-3 walls) | $4,000-$5,500 | | Major open concept (3+ walls, shear wall redesign) | $5,000-$6,000 |

AAA Engineering Design provides fixed-fee proposals for all open concept remodel projects in Irvine. No hourly billing, no surprise charges. Our load-bearing wall removal service is designed specifically for these projects.

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The structural engineer specifies the construction sequence for safe wall removal. This is critical — removing a bearing wall without temporary shoring can cause immediate structural distress. The typical sequence:

Before any demolition, the contractor installs temporary shoring (adjustable steel posts on 4x4 or 6x6 bearing plates) on both sides of the wall to be removed. The shoring carries the loads above while the wall is removed and the new beam is installed. The structural engineer specifies shoring locations and minimum capacity.

Drywall, insulation, and other finishes are removed to expose the structural framing. The contractor verifies the framing configuration matches the structural engineer's assessment.

Wall studs are cut and removed, leaving temporary shoring in place. Electrical wiring, plumbing, and HVAC within the wall are rerouted before stud removal.

The replacement beam is lifted into position. For steel beams, this often requires cutting the beam into two pieces and splicing on-site due to access constraints in occupied Irvine homes. The structural engineer specifies splice details and connection requirements.

Posts (wood, steel tube, or steel pipe) are installed at beam bearing points. The structural engineer designs the post-to-beam connection (typically a steel cap plate with bolts) and post-to-foundation connection (typically a steel base plate with anchor bolts into an existing or new footing).

Once the beam, posts, and all connections are installed and inspected, temporary shoring is removed. The contractor monitors for any movement or deflection — properly engineered beams show minimal deflection when shoring is released.

Beam wrapping (drywall or wood), ceiling repair, and floor patching complete the visual portion of the open concept remodel.

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The single most popular open concept remodel in Irvine. This wall is bearing in nearly all two-story tract homes built by Irvine Company developers. Typical beam requirement: W10x26 to W12x35 steel beam spanning 14-18 feet, with posts at each end bearing on new or existing footings.

Common in Irvine homes with formal dining rooms that homeowners want to integrate into the kitchen. This wall is bearing in approximately 60% of Irvine two-story homes. Beam spans are typically 10-14 feet, often achievable with LVL beams.

Frequently non-bearing in single-story Irvine homes where the wall runs parallel to the roof framing. The structural engineer verifies the wall's bearing status — if non-bearing, the engineering scope is limited to shear wall analysis and replacement.

Partial wall removal — creating a 6-8 foot opening in an existing wall rather than removing the entire wall. The structural engineer designs a header across the opening. Common in Irvine homes where full wall removal would require an impractically large beam.

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If the wall carries any loads from above — roof, ceiling, upper floor — you need a structural engineer. The safest approach: assume every wall is bearing until a licensed structural engineer confirms otherwise. The Irvine Community Development Department requires PE-stamped plans for all wall removal permits.

No. Removing a load-bearing wall without a building permit in Irvine is a code violation. If discovered during a future sale, refinance, or inspection, unpermitted wall removal creates significant liability and cost. The city has the authority to require the wall to be rebuilt or to require retroactive engineering and permitting.

From initial consultation to completed structural plans: 1-3 weeks for most open concept remodel projects in Irvine. Single wall removals with straightforward conditions are completed in 5-7 business days. Multiple wall removals with complex shear wall modifications take 2-3 weeks.

In most cases, yes. The concentrated post load from the new beam exceeds the capacity of the existing slab-on-grade. The structural engineer designs a new isolated footing (typically 24"x24"x12" deep, minimum) at each beam bearing point. The contractor cuts the existing slab, excavates, and pours the new footing before installing the post.

A header spans across the top of an opening (window, door, pass-through) in a bearing wall, carrying the loads from above across the opening. A beam replaces an entire bearing wall, spanning the full length of the removed wall. Both carry gravity loads — beams handle larger loads and longer spans.

Properly permitted open concept remodels with PE-stamped structural engineering consistently increase Irvine home values. Comparable sales data shows open concept layouts command 5-10% premiums over closed-plan equivalents in Irvine neighborhoods. The critical factor: the work must be properly permitted and engineered. Unpermitted wall removal decreases value.

The garage-to-house wall is almost always bearing and is required to be a one-hour fire-rated assembly per CBC Section 406.3. Removing this wall requires both structural engineering (replacement beam) and fire-rated construction methods. The Irvine building department scrutinizes these submittals carefully. See our garage conversion engineering page for related projects.

Contact the Irvine Community Development Department at (949) 724-6000 to request copies of the original building plans. Plans are available for most homes built after 1970. There is a nominal fee for plan retrieval and copying.

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An open concept remodel is the most impactful change you can make to your Irvine home — transforming compartmentalized rooms into flowing, connected living spaces that bring in natural light and create room for the way your family lives today. The structural engineering behind that transformation is what makes it safe, code-compliant, and permanent.

AAA Engineering Design specializes in load-bearing wall removal for open concept remodels throughout Irvine and Orange County. Our residential structural engineering team handles everything from initial assessment through Irvine plan check approval and construction support.

**Call (949) 981-4448 today** to schedule a consultation for your open concept remodel in Irvine. We provide same-day assessments and fixed-fee proposals — no surprises, no hourly billing.

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*AAA Engineering Design serves Irvine, Orange County, and all of Southern California with licensed Professional Engineering services for residential remodeling, additions, and new construction.*