“Open Floor Plan & Load-Bearing Wall Removal in Seattle Homes

*By David Meade, AIA, NCARB | Piper Cole Architects*

> TL;DR: Removing a load-bearing wall in a Seattle or Eastside home costs $8,000–$25,000 all-in for a simple single-wall removal, including structural engineering, the replacement beam, new posts to the foundation, permits, and finish work. It always requires a permit in Seattle and Kirkland — and skipping that permit creates serious problems when you sell. Done correctly as part of a larger remodel, the per-square-foot cost of opening a floor plan drops significantly.

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The single most common project I see when a Seattle-area homeowner calls us is also the one most likely to be misunderstood: removing a load-bearing wall to create an open floor plan. It sounds straightforward — take out a wall, gain a room. In practice, every load-bearing wall removal is a structural engineering project with permit implications, foundation consequences, and cost realities that homeowners often underestimate.

I want to give you an honest picture of what this work actually involves in a typical 1960s–1990s Eastside home, what it costs, and why the permit and professional design matter.

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How to Identify a Load-Bearing Wall in a Seattle Rambler or Split-Level

Before removing any wall, you need to know which walls carry structural load and which are simply partition walls that divide space. Here are the indicators I look for on a typical Kirkland or Bellevue rambler:

Perpendicular orientation to floor joists. Walls that run perpendicular to the floor framing above are candidates for load-bearing walls. Walls that run parallel to the joists are more likely to be partitions. You can often determine joist direction from the basement or crawlspace.

Central location in the plan. Many 1960s–1980s Eastside homes are platform-framed with a center bearing wall that carries the roof ridge load or a center beam that supports the floor above. A wall running down the center of the house, parallel to the long axis, is frequently load-bearing.

Beam in the basement or crawlspace directly below. Look under the house. If a steel or wood beam runs directly below a first-floor wall, that wall is transferring load to that beam — it is structural.

Wall at the perimeter of the building. All exterior walls on a wood-framed home carry load. They are always structural and can only be modified (not eliminated) by adding a header or beam.

Note: these are indicators, not conclusions. The only reliable way to determine whether a wall is load-bearing is to trace the structural load path from roof to foundation, which requires either reviewing the original structural drawings (rarely available for 1970s homes) or having a licensed structural engineer or architect assess the conditions in person.

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What Happens When You Remove a Load-Bearing Wall

Removing a load-bearing wall does not mean the loads disappear — it means the loads need a new path to the foundation. The structural solution almost always involves three elements:

A new beam. The replacement beam spans the opening left by the removed wall. For openings from 12 to 20 feet — the typical range in an Eastside kitchen or living room — the beam is most commonly:

• LVL (Laminated Veneer Lumber): The most common choice. Strong, predictable, available from local lumber yards, and can be built up on-site from 1-3/4″ plies. An LVL for a 16-foot span in a typical two-story situation might be 3-1/2″ × 16″ or 3-1/2″ × 18″. LVL beams are typically hidden inside the ceiling framing, creating a flush ceiling plane.

• PSL (Parallel Strand Lumber): Similar to LVL but slightly stronger and available in wider single-piece dimensions. Useful when architectural expression of the beam is desired — PSL can be left exposed as a design element.

• Steel (HSS or wide-flange): Steel beams can span farther and carry more load with a shallower depth than wood — important when ceiling height is tight. A 16-foot steel wide-flange beam might be only 8–10 inches deep versus 16–18 inches for an equivalent LVL. Steel costs more ($2,000–$6,000 more installed than LVL) and requires a structural welded connection at the posts, but it buys ceiling height.

New posts to the foundation. The ends of the new beam need to land on something. That something is a new post — typically a 3-1/2″ × 3-1/2″ steel column or built-up wood post — that carries the load from the beam down through the floor framing to a new footing or an existing concrete pad. On homes with a crawlspace or basement, the post is relatively straightforward to install. On homes on a concrete slab, the contractor may need to cut the slab, excavate a footing, and pour new concrete before installing the post.

Point load design. The concentrated load at each end of the new beam is a point load. The structural engineer calculates whether the existing foundation can accept this new load or whether a new footing is required. Skipping this calculation is where DIY wall removal creates long-term foundation damage.

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The Permit Process in Seattle and Kirkland

Every load-bearing wall removal in Seattle and Kirkland requires a building permit. There are no exceptions. This is not bureaucratic red tape — it is the mechanism by which a third-party building official verifies that the structural solution is engineered correctly and that the foundation can handle the new loads.

Seattle DCI (Department of Construction and Inspections): Wall removal as part of a larger remodel is permitted under a standard Building Permit. If the wall removal is a standalone project without other work, it may qualify for a Structural-Only permit, which has a narrower submittal requirement. Either way, stamped structural drawings from a licensed Washington State structural engineer or architect are required.

Kirkland (via MyBuildingPermit.com): Kirkland requires a residential building permit for structural work. Submittal requirements include architectural plans showing the scope, structural drawings with the beam and post calculations, and the engineer’s or architect’s stamp. Current review timelines in Kirkland run 6–10 weeks for residential structural permits.

The building inspection process requires at minimum a rough framing inspection (before drywall) and a final inspection. The inspector verifies that the beam, posts, connections, and new footings match the approved drawings.

For larger whole-house remodel projects where wall removal is one element of many changes, I coordinate the structural permit as part of the overall building permit — which is typically more efficient than pulling a standalone structural permit.

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Real Cost Numbers for Wall Removal in Seattle

I hear homeowners quote contractor prices that seem surprisingly low — and then see the project balloon in cost once the contractor opens the wall. Here is a realistic all-in cost breakdown for a simple load-bearing wall removal in a typical Eastside home (single story, 12–16 foot opening, no foundation complications):

Cost Item	Typical Range
Structural engineering fee	$1,500 – $3,500
Permit fees (Kirkland/Bellevue)	$600 – $1,200
Beam and lumber materials	$800 – $2,500
Steel column posts (if required)	$500 – $1,500
Labor — framing and beam installation	$2,500 – $6,000
Footing (if needed)	$1,500 – $4,000
Drywall patch, texture, paint	$1,500 – $4,000
Electrical rerouting (if in wall)	$800 – $2,500
Total all-in	$8,000 – $25,000

The wide range reflects the difference between a simple single-story rambler with a crawlspace (lower end) and a two-story home on a concrete slab with plumbing and electrical in the wall (higher end).

Steel beam solutions add $2,000–$6,000 to the beam and installation cost but may save 6–8 inches of ceiling depth that is worth paying for in older homes with 8-foot ceilings.

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Why DIY Wall Removal Without Permits Is a Serious Problem

I want to be direct about this: unpermitted load-bearing wall removal is one of the most common red flags that comes up in pre-purchase home inspections on Eastside homes. Buyers’ inspectors are specifically trained to look for signs of altered walls — stair-step drywall patches, mismatched ceiling framing, sagging floors, doors that stick on one side of a former wall location.

When an inspector flags an unpermitted structural alteration, buyers have two choices: require the seller to permit and repair the work retroactively (expensive and slow) or walk away. Retroactive permitting often requires opening walls to expose the work, hiring an engineer to assess what was actually done, and correcting any deficiencies before the permit is finaled. The cost frequently exceeds what the original permit would have cost.

Lateral stability is also at stake. Load-bearing walls often contribute to a home’s resistance to lateral forces — earthquake and wind loads. Removing them without compensating lateral resistance (shear walls, hold-downs, or moment frames) can leave a building structurally vulnerable in a seismic event. The Seattle area is in a moderate-to-high seismic hazard zone, and I take lateral design seriously on every project.

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Wall Removal as Part of a Larger Remodel

When wall removal is part of a larger kitchen remodel, main-level renovation, or home remodel in Kirkland, the cost per element drops considerably. The engineering fee covers the whole project, the permit covers all the work, and the contractor mobilization cost is shared across multiple items.

On a $200,000–$300,000 main-level remodel that includes wall removal, new kitchen, new flooring, and updated bathrooms, the structural engineering and permit cost for the wall removal represents a small percentage of the overall project — and the design coordination I provide ensures that the new open floor plan integrates with the rest of the remodel rather than feeling like a patchwork.

If you are considering opening up your floor plan, contact Piper Cole Architects for a site visit. I can assess the structural conditions, give you an honest picture of what is involved, and develop a scope that fits your budget and your vision for the space. We serve homeowners across Kirkland, Bellevue, Redmond, and the Seattle Eastside.

For Seattle-specific permitting questions, our Seattle building permit guide for homeowners is a useful starting point.

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Frequently Asked Questions

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Work With Piper Cole Architects

Opening up your floor plan is one of the most impactful improvements you can make to a mid-century or 1980s Eastside home. When it is done right — with proper engineering, a complete permit, and design coordination that integrates the new opening with your whole interior — the result lasts for decades and adds genuine value.

Contact Piper Cole Architects

425-753-6452 | Kirkland, WA | Serving the Seattle Eastside

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Sources

1. City of Seattle Department of Construction and Inspections. *Residential Structural Alteration Permit Guide*. seattle.gov/sdci.
2. American Wood Council. *Span Tables for LVL and Structural Lumber*. awc.org.
3. Washington State Department of Natural Resources. *Seismic Hazard Maps for Western Washington*. dnr.wa.gov.
4. City of Kirkland Development Services. *Residential Building Permit Submittal Checklist*. kirklandwa.gov.