Skip to main content
Pro.com logo
Portfolio
About
1-800-597-4776
Additions

Additions

We build all types of additions, from mother-in-law suites to DADUs.

Let's add more space. Whether you're looking to build up or out, our construction experts will ensure your new addition is structurally sound and blends seamlessly with your existing home.

Seattle map pinBay Area map pinDenver map pinPhoenix map pinPortland map pinSan Diego map pin

Local roots, national reach

We're a licensed general contractor with local teams across the greater Seattle, Portland, San Francisco, San Jose, San Diego, Denver, and Phoenix areas.

Home addition FAQ

How much does an addition cost? 

Generally, the cost of an addition ranges anywhere from $175 to $600+ per square foot. Of course, every project is different. Even the price of two very similar additions on the same street might be vastly different based on the age of the home or the land underneath. Every situation is unique, but we’re happy to discuss these factors in greater depth. After a free, in-home consultation, we can build a custom estimate that gives you a clear view of the costs of your project. 

Do I need to hire an architect to build an addition?

Yes. Major structural changes require guidance from an architect. We partner with local firms and independent architects with a strong history of client-centered design. We’ll team up with an architect whose personality, pricing, and style align with yours.

As your architect drafts the plans, we advocate from cost-savings and building efficiency. During construction, they help ensure that the build looks exactly as you intended. Together, we build a space that captures your vision and fits your budget. 

I’ve already hired an architect, can Pro.com build my addition?

Yes! Many clients come to us with plans in hand. In these cases, we can produce a highly detailed estimate based on the information your architect has provided. We’re also happy to work with your architect to identify ways to make construction more efficient and affordable. 

How do I get started?

We’re excited to meet you wherever you’re at in the process. Some clients come to us ready-to-build with plans and permits. Others just have a vision and a budget. No matter what you’re considering, we’d be happy to get to know you and your project goals.