Home Additions—More Space, One Accountable Team
Expand your home with seamless room additions, second stories, ADUs, or garage conversions. We coordinate design, engineering, permits, and construction so you get functional space built to code. Serving Western Washington since 1990.
Addition Services We Provide
From single-room expansions to full second stories, we deliver code-compliant additions that blend seamlessly with your existing home.
Room Additions
Bedrooms, home offices, sunrooms, and living space expansions with seamless integration.
Second Stories
Full or partial second-story additions with structural engineering and foundation assessment.
ADUs (Accessory Dwelling Units)
Detached or attached ADUs for rental income, in-laws, or home offices.
Garage Conversions
Transform existing garages into living space with proper insulation, electrical, and HVAC.
Why Homeowners Trust Us for Additions
Permit Experts
We navigate Seattle-area zoning, setbacks, and building codes daily.
Multi-Trade Team
Foundation to finishes—all coordinated by one accountable contractor.
Transparent Pricing
Line-item estimates with clear breakdowns for every phase.
Seamless Integration
We match finishes, rooflines, and architectural details perfectly.
Realistic Schedules
We set achievable timelines and communicate proactively.
30+ Years Experience
Family-owned, woman-led business with proven expertise.
Our 5-Step Addition Process
Consultation & Feasibility
Review your goals, site constraints, zoning, setbacks, and budget. Discuss design options.
Design & Engineering
Coordinate with architects and engineers for plans, structural calcs, and permit drawings.
Permits & Approvals
Submit plans, coordinate city reviews, and secure building permits.
Construction
Foundation, framing, roofing, MEP rough-ins, insulation, drywall, and finishes—coordinated by one team.
Inspections & Close-Out
Final inspections, punch list, warranty documentation, and certificate of occupancy.
Home Addition FAQs
What Homeowners Say
"Our second-story addition gave us two more bedrooms and transformed our home. Pacific West handled every detail from permits to final inspections."
— Jennifer, Ballard
"They built a detached ADU that we now rent out. The process was smooth, and the final product is beautiful and code-compliant."
— Mark, Seattle
"Adding a home office and bathroom was a game-changer. The team kept us informed every step and delivered on schedule."
— Sarah, Kirkland
Get Your Free Addition Estimate
Share your vision and site details—we'll provide a comprehensive proposal with timeline and pricing.
Tell us about your project
Photos help! Get a clear, line-item estimate tailored to your specific needs.
Request Your Bid
Call Us
(206) 890-6901
Email Us
contact@pw-cm.com
Visit Us
Seattle, WA
Ready to Expand Your Home? Let's Start Planning.
Free consultations, transparent pricing, and expert execution across Western Washington.