Home Additions Construction in Mercer Island, WA

Mercer Island is known for its stunning lake views, upscale homes, and close-knit neighborhoods. For many families, expanding an existing home is the best way to enjoy more space without leaving the community they love. At Armada Design & Build, we specialize in home additions construction in Mercer Island, WA, delivering custom designs that blend seamlessly with your home’s architecture while enhancing comfort, functionality, and long-term value.

We serve all areas of Mercer Island, including North Mercer, South Mercer, Eastgate, West Mercer, Mercerdale, and Island Crest. Each neighborhood has unique character and building considerations, and our team tailors each addition to complement your property and surroundings.

Why Choose a Home Addition in Mercer Island

With Mercer Island’s limited lot availability and high demand, moving isn’t always practical. A home addition allows you to:

• Expand your living space without leaving your neighborhood.

• Customize rooms for your family’s specific needs—home offices, master suites, or entertainment areas.

• Preserve your home’s architectural integrity while enhancing functionality.

• Increase the long-term value of your property in Mercer Island’s competitive real estate market.

From second-story additions to detached ADUs, adding space is often the most efficient way to improve your home.

Types of Additions We Build on Mercer Island

Our addition construction services cover a wide variety of needs:

• Second-story additions – Add bedrooms, offices, or lofts while preserving your yard.

• Attached additions – Expand kitchens, living areas, or create guest suites seamlessly.

• Detached ADUs and guest houses – Ideal for multigenerational living or private rental units.

• Bump-outs and room extensions – Small but impactful additions for bathrooms, kitchens, or family rooms.

• Sunrooms and outdoor living spaces – Bright, airy areas to enjoy lake views and natural light.

• Garage additions – Extra storage, parking, or workshop space for your lifestyle.

Mercer Island Neighborhood Considerations

Mercer Island’s neighborhoods vary in lot size, elevation, and proximity to Lake Washington, requiring custom design approaches:

• North Mercer & Island Crest – Expansive homes with lake views often benefit from second-story additions or sunrooms to capture the scenery.

• South Mercer – Established neighborhoods where architectural integration is key to preserve home character.

• Eastgate – Sloped lots may require engineering solutions for stability while maximizing usable space.

• West Mercer & Mercerdale – Modern and traditional homes where additions should complement existing structures.

Each neighborhood’s distinct features influence the design, permitting, and construction strategy.

Our Additions Process in Mercer Island

We follow a structured design-build process to ensure smooth and successful projects:

1. Consultation & site assessment – Discuss your goals, evaluate your property, and understand your vision.

2. Custom design – Plans are developed to ensure your addition fits with your home’s style and meets Mercer Island codes.

3. Permits & approvals – Our team navigates zoning, permitting, and inspections to ensure compliance.

4. Construction – Skilled crews manage every phase, from foundation and framing to finishing details.

5. Final walkthrough & support – Confirm quality and functionality, with continued support after completion.

Permits, Codes, and Regulations

Building in Mercer Island requires careful attention to local regulations:

• Zoning and setbacks – Determine how close your addition can be to property lines.

• Height restrictions – Especially relevant for second-story projects.

• Environmental considerations – Rules for lake proximity, wetlands, and hillside lots.

• HOA or neighborhood guidelines – Some areas have additional approvals for exterior modifications.

• Permitting process – Covers structural, electrical, plumbing, and foundation inspections.

Our experience with Mercer Island regulations ensures your project proceeds smoothly from design to completion.

Common Addition Projects on Mercer Island

Some of the most requested additions include:

• Family rooms and living spaces – Expand your home’s main areas for comfort and entertaining.

• Second-story bedrooms – Add space for growing families.

• Master suites – Private retreats with walk-in closets and luxury bathrooms.

• Kitchen and dining expansions – Open layouts for cooking, hosting, and family gatherings.

• Detached ADUs – Independent spaces for guests, multigenerational living, or rental income.

• Sunrooms – Capture natural light and lake views year-round.

• Garage expansions – Additional storage, parking, or hobby space.

Lifestyle and Value Benefits

A Mercer Island home addition improves both lifestyle and long-term investment:

• Flexible living – Extra rooms for offices, gyms, or creative spaces.

• Comfort & convenience – Additional space for family, guests, or hobbies.

• Enhanced aesthetics – Modernize your home’s appearance while maintaining its character.

• Increased property value – Well-designed additions boost resale potential in Mercer Island’s competitive market.

• Neighborhood retention – Stay in the Mercer Island community you love while adapting your home to fit your needs.

FAQs About Mercer Island Additions

Do I need a permit for a home addition on Mercer Island?
Yes, all additions require permits. Armada Design & Build handles the process from start to finish.

Can I add a second story to my Mercer Island home?
Yes. We address height restrictions, structural requirements, and neighborhood considerations.

Will the addition match my home’s existing style?
Absolutely. Rooflines, siding, and architectural details are designed to blend seamlessly.

Are detached ADUs allowed on Mercer Island?
Yes, many neighborhoods permit ADUs. Our team helps confirm zoning and lot requirements.

Why Choose Armada Design & Build on Mercer Island

• Local expertise – Knowledgeable about Mercer Island neighborhoods, terrain, and city regulations.

• Design-build approach – One team handles design and construction for smooth communication and results.

• Craftsmanship – Quality construction from foundation to finishes.

• Collaborative service – Your vision guides every step of the process.

• Proven reputation – Trusted by homeowners across Mercer Island for successful home additions.

Start Your Mercer Island Home Addition

If your Mercer Island home needs more space, Armada Design & Build is ready to help. From North Mercer to Island Crest, South Mercer to Eastgate, we create custom home additions that enhance your lifestyle, improve functionality, and preserve your home’s beauty.

Contact us today to schedule a consultation and begin planning your new addition on Mercer Island.