Walk in shower conversion cost Seattle

Walk in shower conversion cost Seattle

Quick Answer

Converting a tub/shower combo to a walk-in shower in Seattle typically costs $4,500-$9,500 depending on entry type (low-threshold vs. curbless), tile quality, and structural modifications needed. This includes tub removal, waterproofing, tile installation, grab bars with blocking, shower fixtures, and permits. Curbless conversions requiring floor modification cost $7,500-$12,000+ due to additional plumbing and structural work.

Detailed Explanation

Walk-in shower conversions fall into two categories with significantly different costs and complexity. Low-threshold conversions maintain the existing bathroom floor level and install a shower base with a 2-4 inch curb—essentially replacing the tub with a shower pan while using existing plumbing locations. Curbless (zero-threshold) conversions eliminate the curb entirely for wheelchair accessibility or easiest entry, but require lowering the shower floor area, rerouting drain plumbing, and often reinforcing floor joists to accommodate the new drain location and slope requirements.

Seattle's older homes present specific challenges for shower conversions. Many pre-1960 homes have cast iron tubs that weigh 300-500 pounds and require careful extraction through narrow bathroom doorways or even windows. Original tile surrounds may contain asbestos in the adhesive or grout (common before 1980), requiring specialized testing and potentially licensed abatement before demolition. Floor joist sizing and spacing in older homes may not meet current code for curbless shower installations, requiring structural reinforcement. Plumbing in older homes is often galvanized steel that's corroded internally—opening walls for shower conversion reveals the need for replumbing that wasn't part of the original scope.

Waterproofing requirements have become significantly more stringent in recent years. Seattle's building code requires complete waterproof membrane systems (like Schluter Kerdi or similar) for all shower installations, not just the traditional tar paper and mortar pan. These modern systems cost more but virtually eliminate shower leaks and subsequent water damage. The waterproofing membrane extends up walls to specific heights, integrates with drains through specialized components, and requires inspection before tile installation begins. Cutting corners on waterproofing to save costs creates expensive water damage down the line.

What to Expect

Low-Threshold Conversion ($4,500-$7,500): Removes existing tub, installs pre-formed shower base or tiled pan with 2-4 inch threshold, tiles walls to 6-7 feet height, installs grab bars with proper blocking, adds handheld shower head, and includes basic fixtures. Timeline: 5-7 days including waterproofing cure time. This approach works when floor structure is sound and existing plumbing locations are acceptable.

Curbless Conversion ($7,500-$12,000+): Removes tub, lowers shower floor area 4-6 inches, reroutes drain plumbing, potentially reinforces floor joists, installs linear drain for proper water flow, waterproofs entire shower area, tiles with appropriate slope (minimum 1/4" per foot toward drain), and installs grab bars and fixtures. Timeline: 8-12 days including structural work and cure times. Some installations require engineer specifications if floor modification is extensive.

Cost Variables:

Tile Selection:

• Standard ceramic tile: $8-$15 per square foot installed
• Mid-range porcelain: $15-$25 per square foot installed
• Premium porcelain or natural stone: $25-$45+ per square foot installed A typical shower uses 80-120 square feet of wall tile plus floor tile, making material selection a significant cost factor.

Shower Size:

• Standard 3x3 foot shower: Base pricing applies
• 3x5 or 4x4 foot shower: Add $1,000-$2,000 for additional tile and waterproofing
• 5x5+ foot or custom dimensions: Add $2,000-$4,000

Grab Bar Configuration:

• 2 standard grab bars: Included in base price
• 3-4 grab bars with blocking: Add $300-$600
• Vertical grab bar for entry assistance: Add $200-$300

Fixtures and Features:

• Standard valve and showerhead: Included in base price
• Thermostatic valve (safety feature preventing scalding): Add $300-$500
• Rain showerhead or body sprays: Add $400-$800
• Built-in bench or fold-down seat: Add $400-$900

Permit and Inspection: Seattle requires plumbing and building permits for shower conversions. Permit costs run $300-$500 total. Three inspections are typical: rough plumbing (before walls are closed), waterproofing membrane (before tile), and final (after completion). Permit approval takes 3-5 business days before work begins.

Structural Considerations: Curbless showers require specific floor slope (minimum 1/4" per foot) to prevent water from flowing into the bathroom. Some bathrooms can't accommodate this slope without lowering the shower floor significantly or raising the bathroom floor outside the shower—both add substantial cost. An initial assessment determines whether your bathroom layout supports curbless conversion without major structural modification.

Timeline Breakdown:

• Day 1: Demolition, tub removal, rough plumbing modifications
• Day 2-3: Floor modification (if curbless), waterproofing installation
• Day 4: Waterproofing inspection (must pass before tiling)
• Day 5-7: Tile installation with proper cure times between steps
• Day 8: Fixture installation, grab bars, final details
• Day 9: Final inspection

Longer timelines for curbless conversions or if structural work is needed.

Maintenance and Longevity: Properly installed walk-in showers with quality waterproofing systems last 20-30+ years with minimal maintenance. Annual grout sealing and regular cleaning prevents most issues. The waterproofing membrane, not the tile, prevents leaks—investing in proper waterproofing during installation avoids expensive repairs later.

All estimates are subject to site inspection. Hidden conditions (subfloor damage, plumbing issues, structural deficiencies) discovered during demolition can affect project scope and cost.

Need Help?

Walk-in shower conversions require plumbing expertise, waterproofing knowledge, and understanding of Seattle building codes. Crest & Level handles aging-in-place bathroom modifications including low-threshold and curbless shower installations, permit coordination, and structural assessments for Seattle homes.