home addition contractor Seattle

Home Addition in Seattle

When your home needs more space, Maksymov Brownstone LLC is the trusted home addition contractor in the Greater Seattle Area to bring your vision to life. From custom room expansions and second-story additions to garage, attic and basement conversions, every project is carefully planned to match your lifestyle, property layout and long-term goals, delivering seamless design, comfort and lasting value.

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Why Homeowners in Seattle Choose Home Additions

A custom home addition is a smart way to gain space, comfort and long-term value without the stress of moving. Whether your family is growing or your lifestyle is changing, a thoughtfully designed addition enhances functionality and flow. Expert planning, seamless construction and tailored solutions ensure the new space blends naturally with your home while meeting your unique needs and increasing property value.

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Explore our range of home addition options

Second-story addition

Second-story addition

A second-story addition builds up your home vertically while keeping the full yard. It has space for more bedrooms, bigger living rooms or a home office and lets you stay in the home you love without moving. This renovation increases natural light, adds new vistas and provides an engineered plan that can evolve with your family.

  • Maximized Space
    Building upward adds significant square footage without widening the home’s footprint. It’s ideal for narrow lots with limited expansion room.
  • Increased Living Area
    The new floor can host bedrooms, an office or a spacious suite. Layouts can be tailored to long-term lifestyle needs.
  • Architectural Design
    The existing structure and new addition are carefully designed and engineered for structural stability. Exterior finishes and rooflines are matched to maintain a cohesive look. Our team of civil engineers and architects collaborates closely with the city to ensure safety and compliance with all regulations.
Explore Second-Story Addition
Upper floor additions

Upper floor additions

Adding a level allows homeowners to gain valuable square footage without reducing outdoor living areas. This solution is ideal for properties with limited lot size, helping expand functional zones vertically while maintaining garden space. Upper floor additions also improve internal organization, giving flexibility to redesign both existing and new living areas for better comfort, privacy and daily flow.

  • Preserved Outdoor Space
    Vertical expansion keeps backyard and garden areas intact for relaxation and recreation.
  • Enhanced Ground Floor Layout
    Reworked lower-level plans improve circulation, natural light, and indoor-outdoor connections.
  • Versatile Upper-Level Rooms
    Creates private bedrooms, home offices, playrooms, or quiet retreats for growing families.
  • Architectural Continuity
    Ensures the new level complements the home’s design while meeting zoning and height regulations.
Side and rear additions

Side and rear additions

Expanding your home with side or rear additions not only increases living space but also enhances property value and functionality. These projects allow homeowners to create more versatile rooms, improve flow between interior and outdoor areas and incorporate upgrades like larger kitchens, bathrooms or garages.

Benefits and Features:

  • Expanded Living Space: Adds usable square footage at ground level without the need for additional stories.
  • Functional Room Design: Perfect for kitchen enlargements, dining areas, family lounges or dedicated workspaces.
  • Seamless Indoor-Outdoor Flow: Improves access to patios, gardens and outdoor living zones while keeping architectural harmony.
  • Efficient Build Timeline: Typical projects finish within 12-18 weeks, minimizing household disruption.
  • Additional Income Opportunities: Create an ADU or DADU unit to rent out or develop a separate small home on your lot for sale or lease — common practices in Washington state.

These additions are ideal for homeowners looking to remodel strategically, enhance comfort and maximize both living quality and investment potential.

Whole House Renovation

Home addition contractor you can trust in Seattle

Planning a home addition is one of the most significant investments a homeowner can make — and the contractor you choose determines whether it goes smoothly or becomes a source of stress.

Maksymov Brownstone LLC handles every step in-house: design, structural engineering coordination, permits and construction — with the same team from first consultation to final walkthrough. No subcontractors means one point of accountability, consistent quality and no communication gaps between trades.

We're licensed by Washington State L&I, fully insured and have been building home additions across Seattle, Kirkland, Bellevue and the Eastside for 15+ years. Every project starts with a free on-site estimate and a clear, itemized scope — no vague quotes, no surprises on the invoice.

Workflow roadmap

Our workflow roadmap keeps your project clear and on schedule: from first meeting to final walkthrough, we manage permits, design, construction and warranty with precision and respect for your time. This process is built to be efficient, organized and worry-free for every homeowner.

Schedule Consultation
  • 01

    Initial consultation

    The process begins with a detailed on-site consultation focused on understanding your goals, lifestyle needs and budget. During this visit, the team evaluates your property, existing structure, lot conditions, access points and available space for expansion. This allows for accurate recommendations, realistic planning and a clear project roadmap tailored to your vision.

  • 02

    Design phase

    During this stage, detailed plans, layouts and 3D visualizations are developed while finishes, materials and systems are carefully selected. Every design choice is refined to align with your lifestyle, functional needs and budget, forming a strong foundation for successful construction.

  • 03

    Pre-construction planning

    This phase focuses on securing permits, confirming schedules, finalizing construction plans, ordering materials and coordinating trades. Thorough preparation ensures a smooth project launch, prevents delays and keeps every stage organized, predictable and efficient from the very beginning.

  • 04

    Construction phase

    From demolition and structural framing to systems installation and final finishes, every phase is carefully managed to maintain consistent quality. Clients receive clear progress updates, milestone tracking and open communication, ensuring transparency and confidence throughout the entire building process.

  • 05

    Final walkthrough & warranty

    Once construction is complete, a detailed walkthrough is conducted to review every element and address any final adjustments. Clients receive full warranty coverage and clear guidance on care and maintenance, ensuring long-term satisfaction, confidence and peace of mind in their new living space.

We craft enduring home additions with thoughtful design and clear intention.
Ready to transform

Expanding your vision beyond home additions

While home additions are a core specialty, the team also delivers a wide range of renovation services, including kitchen and bathroom remodeling, fireplace installations and complete interior upgrades. Every project receives the same attention to detail, craftsmanship and quality. Homeowners are welcome to reach out and schedule a consultation to explore tailored solutions that fit their goals, lifestyle and vision.


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5 average (9 reviews)

What our customers say

J
J Jenny Lian
5 months ago

I recently had the pleasure of working with Ihor on a remodeling project for my home, and I couldn't be happier with the results. From start to finish, Ihor demonstrated exceptional professionalism, skill, and dedication.

J
J John Nye
5 months ago

This company is amazing. Their team of specialists at remodeling proved to be hard working, determined and perfectionists. The assessment of needs was simple and the quote was more reasonable than expected, and the final invoice had no surprises. There are no risks in engaging this company.

S
S Soledad Guerrero
5 months ago

The experience was so positive that we’re already thinking ahead to our next project with them: remodeling all of our bathrooms. Knowing how dedicated they are to their craft gives us complete confidence in choosing them again.

A
A Amy Zier
3 months ago

They did an excellent job on my bathroom! Detailed work and calculated everything before cutting. Highly recommend!

B
B Ben Johnson
3 months ago

Ihor and his team have done work all throughout our house and always provide professional and fair service. I appreciate that they take the time to make sure the work is done right. Use them for your next project!

D
D Diana Pollock
3 months ago

Ihor and his team are AMAZING!!! Does awesome work, very responsive, and always has great solutions. Highly recommend!

M
M Marta Stashevska
3 months ago

Fast and reliable service. Flooring look amazing. They know what they’re doing, they recommend materials, and always answer questions.

S
S Sergei Fadeev
3 months ago

Ihor and his crew did amazing work on our kitchen. Everything turned out great. We got 100+ sqf addition so now our kitchen is bigger than before. Also they made this custom cabinets. Highly recommended!

Y
Y Yauhen Soladau
3 months ago

Good company, thanks for your work. I will be recommend this company to my friends.

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Where we build home additions

Maksymov Brownstone LLC builds home additions across the Greater Seattle Area — from second-story additions and master suite expansions to in-law suites and room additions. Our in-house team handles design, permits and construction across all cities we serve:

  • Kirkland

  • Bellevue

  • Redmond

  • Bothell

  • Shoreline

  • Mountlake Terrace

  • Kenmore

  • Lake Forest Park

  • Woodinville

  • Issaquah

  • Sammamish

  • Renton

  • Mercer Island

  • Edmonds

  • Duvall

  • Clyde Hill

  • Medina

  • Snoqualmie

  • North Bend

  • Fall City

  • Cottage Lake

  • Newcastle

  • Burien

Ready to transform your space?

Ready to transform your space?

Take the first step toward a more functional home. Share a few details about your project and our team will provide personalized guidance, clear next steps and a free consultation to help you expand your living space with confidence and expert support.
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Frequently asked questions about home additions in Seattle

Have questions about your home addition project? Here are the most common things Seattle-area homeowners ask before getting started

How much does a home addition cost in Seattle?

Home addition costs in the Seattle area vary significantly based on project type and scope. As a general reference: a single-room ground-level addition runs $80,000–$150,000, a master suite or in-law suite addition typically ranges $120,000–$250,000, and a full second-story addition starts at $250,000 and up. These ranges reflect Seattle's local labor and material costs. The final number depends on your existing structure, foundation requirements, finishes and permit complexity. Maksymov Brownstone provides a detailed itemized estimate at no charge — contact us for a free consultation.

Can a home addition contractor manage all permits for Seattle projects?

All home additions in the Greater Seattle Area require proper permitting to comply with safety and zoning regulations. Requirements vary by jurisdiction and project scope, including structural, electrical and plumbing permits. Second-story or complex additions may also need engineering assessments. Our team manages the entire permit application and inspection process with SDCI and other local authorities, ensuring your project meets building codes, setback standards and local zoning laws without stress.

How long does a home addition take in Seattle?

A typical home addition with Maksymov Brownstone ranges from 3–5 months for a single-room ground-level extension, 6–10 months for multi-room or upper-level additions and 8–14 months for a standalone accessory dwelling unit. These timelines include design and permitting — permit review by Seattle SDCI typically takes 6–12 weeks depending on project complexity. Timing also depends on seasonal conditions and material availability.

How big can my home addition be?

The size depends on your lot size, zoning designation and existing structures. Seattle and surrounding cities apply setback requirements, height limits and lot coverage maximums — typically 35–50% of the lot depending on the zone. Our team reviews your specific parcel and zoning code to design an addition that maximizes the allowable space while meeting all regulations.

Can I stay in my home during construction?

In most cases, yes. For ground-level side or rear additions, most clients stay home throughout construction. For second-story additions or projects that require significant structural work on the existing roof or load-bearing walls, there may be a period of 1–3 weeks where temporary relocation is more comfortable. We discuss this during planning and sequence the work to minimize disruption.

What is the difference between a home addition and an ADU?

A home addition expands your primary living space — adding square footage that's connected to and part of the main home, such as a new bedroom, expanded kitchen, sunroom or second story. An ADU (Accessory Dwelling Unit) is a separate self-contained living unit with its own entrance, kitchen and bathroom, either attached to or detached from the primary home. Both increase property value but serve different purposes. If you're unsure which fits your goals, contact us for a free consultation.

How do I choose a home addition contractor in Seattle?

Look for a licensed, insured contractor with local permitting experience and an in-house team — no subcontractors means one point of accountability for the entire project. Verify their Washington State contractor license through L&I, check reviews on Google and ask for references from similar projects. Maksymov Brownstone LLC has built home additions across Greater Seattle for 15+ years, handling design, permits and construction with the same in-house crew from start to finish.