Custom Home Additions in Seattle, WA

Running out of room at home? As your family grows, your lifestyle changes, or you simply want more space to enjoy life, a custom home addition might be the perfect solution. When people in Seattle come to HM Custom NW, we help them build well-designed, beautifully crafted Home Additions Seattle that seamlessly blend with their existing home.

We’re local builders with years of expertise in transforming unused space into functional, livable square footage without the need to relocate. From single-room additions to complete second-story expansions, we guide you through the process step by step.

Why Choose HM Custom NW for Seattle Home Additions

When expanding your home, you need a team you can trust. As a locally owned company, we understand how to work with small lots, older homes, and Seattle’s building regulations. Our process is straightforward, based on common sense, and focused on delivering long-term value.

Homeowners rely on us because we provide:

  • Straightforward estimates and transparent timelines

  • Comprehensive design-build services

  • Assistance with obtaining city permits and inspections

  • Meticulous planning and skilled craftsmanship

  • A clean, professional worksite

We treat your home as if it were our own and handle the details so you can avoid unnecessary stress.

Types of Home Additions We Construct

Seattle Home Additions are not all created equal. The right addition depends on your space, budget, and goals. We help you explore the best options to suit your property and needs.
The following are the most common Home Additions Seattle we construct:

  1. Room Additions
    Need a new living space, office, or bedroom? We can create a room that feels like it was part of your home from the start. Room additions are ideal for growing families or anyone needing more versatile space.

  2. Second-Story Additions
    If you can’t expand outward, go upward. Adding a second story provides more space without sacrificing your yard. This is a popular choice in Seattle areas where space is at a premium.

  3. Kitchen Expansions
    Expand your kitchen to include a bar, additional cabinets, or a seating area. We help you create a kitchen that’s functional for everyday use.

  4. Bathroom Additions
    Adding a bathroom is one of the most practical improvements you can make. Whether it’s a powder room, guest bathroom, or master en suite, we ensure it fits your plumbing and floor plan.

  5. Sheds and ADUs
    Want to convert your garage into a living space? Or add a backyard cottage or basement apartment? We can help you create rental units, guest suites, or homes for extended families.

  6. Outdoor Rooms with Roofs and Porches
    A spacious, well-designed porch or patio lets you enjoy the outdoors year-round. Enhance your yard and elevate your lifestyle with an outdoor living space.

How We Add On to Your House

We understand that adding on to your home can feel daunting. That’s why we break the process into simple, manageable steps and keep you informed every step of the way.

Step 1: Initial Consultation
We visit your home to discuss what’s not working and what you’d like to achieve. We assess your existing space and talk about your style, goals, and budget.

Step 2: Planning and Design
Work with our in-house design team or provide your own plans. We’ll guide you through creating the layout, selecting materials, and developing a construction plan. We’ll also explain all your options and answer any questions.

Step 3: Permits and Scheduling
As your Seattle Home Addition Contractor, we manage the permits, zoning regulations, and inspections required by the city. We also create a detailed building schedule and procure materials.

Step 4: Construction
Once everything is in place, we begin the build. Our team ensures your property remains safe, clean, and on track. We keep you updated so you always know what’s happening.

Step 5: Final Walkthrough
When the project is complete, we guide you through the new space to ensure everything meets your expectations. If adjustments are needed, we address them promptly.

How Much Do Home Additions in Seattle Cost?

The cost of a home addition in Seattle varies based on factors like the addition’s size, the type of rooms added, your home’s condition, and the finishes you choose.

Here’s a rough estimate:

  • Small room addition: $50,000 to $80,000

  • Second-story addition: $150,000 to $300,000 or more

  • Garage conversions/ADUs: $90,000 to $480,000

  • Kitchen expansions: $60,000 to $270,000

  • Bathroom additions: $40,000 to $175,000

We offer free, no-pressure estimates and are happy to discuss your options in detail.

Why Add to Your Home Instead of Moving?

Many Seattle homeowners love their neighborhood but find their house no longer meets their needs. Moving is expensive, often involves a bidding war, and may mean leaving a beloved community. A home addition is a smart way to stay in place while gaining the space you need. What's more, we can customize your space to meet your exact lifestyle, rather than settling for something that only meets “most” of what you are looking for.

Advantages of constructing a home addition:

  • More space without leaving your neighborhood

  • Increases your home’s long-term value

  • Customized to your exact specifications

  • Often more cost-effective than buying a larger home

  • No moving costs, real estate fees, or stress of finding a new house

Whether you need space for an aging parent, a new baby, or a home office, a custom addition lets you stay in your current home with the extra room you need.

Are You Ready to Expand Your Seattle Home?

Now is the perfect time to consider a home addition. If you want high-quality craftsmanship, clear communication, and lasting results, HM Custom Builders is your go-to home addition builder in Seattle.

We don’t cut corners or deliver unplanned work. We create home additions that are durable, thoughtfully designed, and blend so seamlessly they feel like they’ve always been there.

Call us today to schedule a free consultation, or request an estimate online at: https://www.hmcustomnw.com/home-additions-seattle-wa

Let's create the space your home has been lacking—without the hassle of relocating.