Seattle Home Additions

Improve quality of life and the value of your home.

Do you love your Seattle home but long for more space?

A thoughtful addition can preserve the character of your home while improving life and expanding your living space. In the past ten years we’ve completed hundreds of home renovation projects, adding a story, transforming a basement, and expanding the footprint of many classic Seattle homes.

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While Seattle has a range of architecturally diverse neighborhoods, many of our charming, older homes were originally built with only one bathroom, a small front porch, or a cramped kitchen. We have built our careers working on these homes.

Our team works closely with Seattle families to explore their options for expanding your home’s footprint, adding a story, or redesigning your existing space to better suit your modern lifestyle.

We help our clients weigh the pros and cons of building an addition, balancing the cost of excavation, likely return on investment, the zoning and foundation limitations on your property, with the dream of maximizing your space to bring out the true potential of the older home that your family has fallen in love with.

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Additions Showcase

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Adding a 2nd Story Addition

For many Seattle families, adding a second floor is the homeowner’s dream. By building up instead of out, we can escape the space limitations and zoning issues inherent in a smaller lot. We’ve worked with clients to create second-story master bedroom suites, sunny home offices, and even game rooms. Adding a second story can significantly increase the value of your home.

Home Office

Room additions have grown in popularity as more and more people find themselves working from home. Where it’s practical to expand your home’s footprint, a dedicated home office addition can provide creature comforts, privacy and technological innovation while eliminating the stress of a rush-hour commute. Work with our design team or your own architect to envision the perfect layout for your work style.

Bathroom or Kitchen Additions

The need for an addition sometimes begins with a focus on the essentials. But a grand, new kitchen can also be more than a practical solution for an overcrowded resource – it can become your favorite part of the house. A place that makes you smile. And when it comes to the bathroom, we’ve seen how a home with just one can create a morning traffic jam. With a bathroom addition you can also add new creature comforts, such as a bigger shower, sink, spa or laundry room.

Relax. Enjoy your life. We’ve got this.

Our clients know they’re in good hands. Since 2010, we’ve honed our skills and perfected our process by completing over 300 home renovation and construction projects in Seattle and around the Puget Sound.

We’ve spent our lifetimes in the construction industry and built a company culture focused on honesty, integrity in craftsmanship. Over the course of your construction project, you’ll appreciate our consistently high level of communication and you’ll feel empowered in regular, weekly calls to talk about your project.

Our proven process reduces stress and accounts for every detail, from concept and design through preconstruction and construction, until the day you move in to your new space and beyond.

Call us today. Let’s talk about your project.

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We’ll guide you through the whole process.
We also offer virtual home visits, preconstruction planning and design.

Tell Us About Your Project

Home Addition FAQs

How much does it cost to build a new house in Seattle?

There are many different factors that go into determining the overall cost of building a new home or addition in Seattle:

  • Permits—The fees can vary based on the type of city permit.
  • Financing—If you plan on financing the project through a bank, you’ll have financing costs.
  • Design–Work with our experienced in-house design team or bring your architect. Our process is designed to ensure continuity and keep everything running smoothly.
  • Sitework—Sitework consists of the costs that go into preparing your site for construction, including utilities, sewer, and landscaping.
  • Materials—Do you want custom features on your addition? The materials you choose can affect the overall cost of the project.
  • Construction Costs—The overall construction costs of building the addition. 

Before your project begins, we’ll have an exact budget and you’ll have a chance to sign off on everything. The best way to determine how much a new addition to your Seattle home will cost is to contact us, and we’ll send one of our expert craftspeople to meet with you at your home – or conduct a detailed video chat – to learn more about your project. Our goal is to be able to provide an accurate ballpark budget as early as possible, refine it with you as the designs are finalized, and finally to agree upon a detailed and accurate quote that fits your budget goals.

How long will it take the average addition project to complete?

Depending on the scope of the project, it can take anywhere from three to eight months to complete an addition project for your Seattle home. Many factors can increase the overall length of time it takes:

  • Severe weather
  • Mid-project changes to the scope by the client
  • Material availability (rare materials vs. common ones)
  • Permits

We work closely with our clients to keep them informed and updated at every step of the project. This constant communication will provide you with peace of mind knowing that we’re micro-managing every aspect of the project until completion.

Is it better to add on or build a new house?

The answer to this question depends upon what you want to accomplish and the amount of space you have on your property. For example, if you want to add a DADU, you will need a certain amount of property space. The best way to determine if it’s better to add on or completely rebuild your home is to schedule a free consultation, and and we’ll speak with you about your options and help plan next steps.

Are home additions worth it?

Yes, a home addition is definitely worth it. In addition to increasing your home’s overall value, an addition will provide you with increased living space and improved quality of life.

There are many different types of home additions:

  • Second Floor Addition
  • First Floor Addition
  • Basement Remodel
  • Whole House Renovation
  • Detached Accessory Dwelling Unit

Each type of addition has its own unique advantages. For example, if you have elderly relatives living with you, a 1st-floor addition will prevent them from having to walk up and down the stairs. Conversely, a 2nd-floor addition works great for homes on small lots or if you want to separate your sleeping from living area.

Can you make additions in phases?

We work closely with our clients to accommodate their schedules. For example, when the kids are out of school or want to take a vacation and come home to your new addition.

Finding A Contractor for Your Home Addition in Seattle

Harjo Construction has completed hundreds of projects in Seattle since 2010. We’ve helped countless Seattle homeowners realize their dreams with their home addition projects.

Although we routinely work on projects created by architects or designers, we also offer in-house design services for simpler projects. We partner with architects for all magnitude of residential projects.

If you’re ready to speak to someone about your project or have any questions about adding an addition to your Seattle home, contact us or give us a call at: (206) 909-6312.

Success Stories


“Problems were solved quickly and Harjo demonstrated a clear priority on customer experience.”
Siri, 2020 Bathroom Remodel

Let’s get started

We’ll guide you through the whole process.
We also offer virtual home visits, preconstruction planning and design.

Tell Us About Your Project