Home Additions
Home Additions & Room Extensions | Seattle & Eastside
Expand your living space without moving. RZO Construction manages your home addition from permits to final walkthrough — on time and on budget.
What We Build
Home Addition Services
Room Additions
Second Story Additions
Garage Additions
Sunroom & Deck Additions
How It Works
Our Addition Process
Consultation
We assess your property, discuss your vision, and explore what's possible within your lot and budget.
Design & Permits
Our team prepares full architectural drawings and manages all permit applications with your city.
Construction
Our licensed crew builds your addition with precision, keeping you informed every step of the way.
Final Walkthrough
We walk through every detail with you and aren't done until you're completely satisfied.
FAQs
Common Questions
How long does a home addition take in Seattle?
Typically 3–6 months depending on the scope of work and permit timeline. Permitting alone can take 4–12 weeks in King County, so starting early is key.
Do I need permits for a home addition?
Yes — all structural additions require building permits in Washington State. RZO handles all permitting on your behalf.
Will a home addition increase my property value?
Yes. Home additions are consistently among the highest ROI home improvements, especially in the Seattle metro market where square footage carries significant value.
How do I get started?
Schedule a free in-home consultation. We'll assess your space, discuss your vision, and provide a detailed estimate with no obligation.
Start Your Project
Ready to Transform
Your Home?
Start with a free estimate. No pressure, no obligation — just an honest conversation about your project.
No obligation estimate3D design on every projectFixed-price written proposal