How Much Does a Home Addition Cost in Tacoma? [2026]
If you are running out of space but love your current home and neighborhood, a home addition might be the perfect solution. One of the first questions homeowners ask is: How much will it cost? Adding space is a significant investment, and understanding the pricing upfront can help prevent delays, stress, and surprises.
At Massey Remodel + Design, we build high-quality home additions across Tacoma and the Eastside. Our additions are designed to blend seamlessly with your existing architecture, improve livability, and deliver lasting value. In this guide, we break down 2025 home addition costs and share what you can expect as you plan your project.
What Is the Cost of a Home Addition in Tacoma?
The Average Cost Range
In 2025, the cost of a home addition in Tacoma typically ranges from $200,000 to $350,000 and above. The final cost depends on the size of the addition, the quality of materials, structural complexity, and how much new plumbing, electrical, or HVAC work is required.
Basic Addition: $200K+ — Ideal for simpler expansions like a bonus room or garage conversion using standard finishes.
Mid-Range Addition: $300K+ — Includes layout improvements, mechanical upgrades, and higher-end materials.
Custom or Luxury Addition: $350K+ — Designed for larger projects with premium finishes, structural work, and architectural enhancements.
Every Massey Remodel + Design addition includes professional planning, full-service design, and our 3-year no-hassle warranty.
Tacoma Remodel Pricing by Quality Tier
Basic Additions start around $200,000 and cover straightforward expansions with minimal structural or mechanical changes. These additions are ideal for homeowners who want to increase space without a complex layout overhaul.
Mid-Range Additions begin at $300,000 and offer enhanced functionality, upgraded finishes, and integration of mechanical systems. These projects are perfect for growing families who need a little more room with added comfort and performance.
Custom or Luxury Additions start around $350,000 and often include architectural features, structural upgrades, and premium materials. These additions are fully personalized and tailored to elevate the entire home.
Cost Per Square Foot for Home Additions in Tacoma
Home additions in Tacoma typically cost between $350 and $550 or more per square foot. The price varies depending on how well the new space connects to the existing home, whether foundation work is required, and the level of finish.
For example, a simple bump-out for a bedroom may fall at the lower end, while a fully customized two-story addition with a kitchen or bathroom will fall at the higher end. Older homes may also require more structural or systems upgrades, which adds to the cost.
ROI for Tacoma Home Additions
A thoughtfully designed addition not only improves your everyday living but can also boost your home’s resale value. In Tacoma, most home additions return between 55% and 75% of their cost at resale.
Rooms that add functionality and square footage, such as new primary suites, second-story additions, or expanded kitchens, tend to have the highest return. Even if resale is not your immediate goal, the added space brings daily value in comfort, efficiency, and enjoyment.
Tacoma Home Addition Pricing by Type
Second Floor Additions
Second story additions significantly expand square footage without extending the home’s footprint. These projects often involve structural reinforcement, a new staircase, and extending HVAC, electrical, and plumbing systems. Expect to invest $300,000 to $550,000 or more depending on size and level of finish.
Garage Conversions
Garage conversions are a cost-effective way to gain usable space without building from scratch. These often become home offices, guest suites, gyms, or flex rooms. With proper insulation, finishes, windows, and mechanical upgrades, expect to spend $150,000 to $275,000.
Basement Conversions
Finishing or remodeling your basement can transform underutilized space into something functional. Projects might include adding bedrooms, bathrooms, or entertainment areas. With egress requirements, waterproofing, and systems work, costs usually range from $125,000 to $275,000 or more.
Kitchen Expansion Additions
Kitchen additions often involve expanding the kitchen by building outward or absorbing underused adjacent space. These projects include new structure, custom cabinetry, upgraded plumbing and electrical, and luxury finishes. Most fall in the $200,000 to $350,000 range.
Bathroom Additions
Adding a bathroom is a high-ROI upgrade that improves function and resale value. Costs depend on whether it’s a full bath, ensuite, or powder room and where plumbing is located. Expect to spend $60,000 to $120,000 depending on complexity and materials.
Bonus Room Additions
Bonus rooms add flexible space for playrooms, home offices, or media rooms. These spaces are often built over garages or added to the main level. A typical bonus room addition in Tacoma runs between $150,000 and $300,000.
Tacoma Home Addition Costs by Area
Each neighborhood brings different home styles, lot sizes, and design needs. Below are estimated addition costs for key areas:
Auburn Home Addition Cost
$200K to $350K+
Known for spacious suburban lots, Auburn homes often add bonus rooms, primary suites, or basement remodels.
Burien Home Addition Cost
$225K to $375K+
Homeowners here often look for kitchen expansions or full second-story additions to make the most of their compact lots.
Black Diamond Home Addition Cost
$225K to $400K+
Larger properties offer space for luxurious expansions like primary suites or detached guest suites.
Bonney Lake Home Addition Cost
$200K to $350K+
Popular for garage conversions and kitchen expansions that blend with newer developments.
Covington Home Addition Cost
$200K to $325K+
Smaller additions and bathroom upgrades are common, helping growing families stay in place.
Des Moines Home Addition Cost
$225K to $375K+
Often includes coastal view homes where additions must be designed with care to preserve aesthetics.
Edgewood Home Addition Cost
$225K to $400K+
Families often add bonus rooms or multi-room additions to take advantage of larger lots.
Milton Home Addition Cost
$200K to $325K+
Homeowners tend to focus on interior additions like bathroom upgrades or home offices.
Normandy Park Home Addition Cost
$250K to $425K+
High-end homes require architectural consistency for luxury primary suite or kitchen additions.
Puyallup Home Addition Cost
$200K to $350K+
A mix of second-floor additions and garage conversions is common to add living space.
Ruston Home Addition Cost
$275K to $450K+
Known for its charming older homes, Ruston additions often require structural upgrades and premium materials.
Enumclaw Home Addition Cost
$200K to $350K+
Basement conversions and family room additions are frequent upgrades.
Federal Way Home Addition Cost
$200K to $325K+
Many homeowners pursue efficient kitchen expansions or bonus rooms.
Fircrest Home Addition Cost
$225K to $350K+
A popular area for adding bedrooms or transforming unused space into functional rooms.
Gig Harbor Home Addition Cost
$250K to $425K+
Custom additions here often include outdoor living integration or spa-like suites.
Kent Home Addition Cost
$200K to $350K+
Additions typically include bedrooms, family rooms, or kitchen expansions.
Lake Tapps Home Addition Cost
$275K to $425K+
High-end lakefront properties may include large-scale additions and luxury features.
Sumner Home Addition Cost
$225K to $375K+
Bonus rooms and bathroom additions are among the most popular choices.
Tacoma Home Addition Cost
$200K to $400K+
A wide range of additions are common, including second stories, primary suites, and kitchen extensions.
University Place Home Addition Cost
$250K to $450K+
Homeowners prioritize seamless, upscale additions with refined finishes.
Factors That Influence Home Addition Pricing
Scope of the Addition
Larger or more complex additions involving kitchens, bathrooms, or new mechanical systems require more planning, materials, and labor. A simple bonus room will cost less than a full second-floor addition.
Size and Complexity
The more square footage you add, the more materials and labor are needed. Additions that require new rooflines, custom framing, or staircases also increase complexity and cost.
Material and Finish Quality
Choosing premium windows, flooring, cabinetry, fixtures, and finishes will impact the final price. At Massey, we help you balance beauty and budget with options that align with your goals.
Labor Costs in Tacoma
Labor makes up a significant portion of any addition budget, usually 30 to 40 percent. Tacoma offers more competitive labor costs than Seattle, but high-quality craftsmanship is still a priority.
Structural Requirements
If your addition involves foundation work, roofing extensions, or structural reinforcements, the cost will rise. Structural changes also require engineering reviews and approvals.
Permits and Inspections
Most additions require structural, electrical, plumbing, and mechanical permits. Depending on the complexity, permitting fees typically range from $3,000 to $10,000 or more.
Condition of the Existing Home
Older homes may need electrical panel upgrades, HVAC changes, or insulation improvements to bring systems up to code. Connecting old and new spaces smoothly often requires careful planning and additional work.
Time of Year
Spring and summer are the busiest seasons for remodeling in Tacoma. Booking your project early or targeting off-peak months like fall or winter can help secure availability.
Design and Professional Services
Design-build planning, 3D models, selections support, and engineering services typically add $15,000 to $40,000 to your project. These services reduce costly mistakes and ensure a cohesive final result.
Pro Tips to Plan Your Home Addition Budget Wisely
Identify your non-negotiables early so your team can prioritize them in the design.
Be clear on mechanical needs like HVAC, plumbing, or electrical extensions.
Budget for engineering and structural reviews from the beginning.
Simplify rooflines and layouts where possible to reduce costs.
Reserve a 10 to 20 percent contingency for unexpected costs.
Choose materials that are both durable and timeless to maximize value.
Plan early so you can get on the calendar before peak season.
Why Work with Massey Remodel + Design for Your Tacoma Home Addition
When you choose Massey, you are getting more than a contractor. You are gaining a design-build partner who walks with you through every step. From concept to construction, our in-house design team and project managers provide clarity, creativity, and coordination.
We maintain strong relationships with Tacoma's top trades and vendors, and we back our work with a 3-year no-hassle warranty. Our team understands the unique styles and structures found in Tacoma homes and approaches each project with care and craftsmanship.
Conclusion
Adding onto your home is a major decision, but it can dramatically improve how you live. By understanding the real costs of a Tacoma home addition in 2026, you can move forward with clarity and confidence.
Whether you are envisioning a spacious kitchen, a second story, or a luxurious primary suite, Massey Remodel + Design is here to help bring your vision to life. Book a consultation with our team or explore our portfolio to see how we help Tacoma homeowners transform their space.