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Building addition to a house in Seattle, WA.


Turn to Us for Home Addition Ideas in Seattle, WA

No one likes living in a cramped space, but moving is no fun either. ACS Seattle has the solution: home addition ideas in Seattle, WA, including options for a second floor. Whether you live in a townhome, row-house, or single-family home, our team can complement it with the perfect new room designed to your specifications. We have more than 27 years of experience building additions onto--and renovating existing parts of—properties. Everyone on our team is well-equipped to help you make the most of the home that you love.  

Our home construction includes fixed bids and free verbal estimates for your convenience. Just give us a call, and we’ll be happy to perform an assessment on-site. We’re honest with you about what’s possible and manage the complex permitting process, so you don’t have to worry about it. ACS Seattle has impressive credentials, including membership in professional building organizations like:

Business Networking International | National Association of Home Builders | Master Builders


Which Second Story Addition Is Right for You

There’s more than one way to increase the space and the property value of your home. At ACS, our primary offering is the ability to turn one-story houses into two-stories. There’s no shortage of what you could do with another entire floor on top of your space. One option that tends to be popular is modular home extensions.

These are pre-fabricated and added onto exteriors to create a second story. They’re more affordable than their conventional counterparts and can be made off-site, which spares you having to live in a construction zone during the process. Ask our crew if a modular addition could be a good option for you.

Second story addition in Seattle, WA

Building Additions to Houses the Safe Way

We’re not only the remodeling contractors in Seattle but also water intrusion specialists. After all our training and years in business, we know what water does to an interior and how to stop it. You can count on our associates to design your addition in such a way that it resists mold and the musty smells that come with it. This applies to any addition you choose, and rest assured, we’ve built them all. 

Types of Rooms Built

Some of the rooms we can create for your family are:

  • Personal Office
  • Playroom
  • Apartment Rental Units
  • Repair Workshops
  • Home Theater
  • Additional Bathroom
  • Additional Bedroom
  • Nursery
  • Sunrooms
  • Mudrooms
  • Dormers
  • Laundry Rooms

Contractor's License #ACSSEA 922BT