Outgrowing your home? Don’t move—improve! Barcelo Construction specializes in seamless home extensions, second-story additions, and luxury ADUs tailored to your lifestyle.
Adding to your home is one of the most complex construction projects you can undertake. It requires a perfect blend of structural engineering, architectural design, and master craftsmanship. At Barcelo Construction, we excel at creating home additions that look and feel as though they were always part of the original structure.
In Seattle’s dense neighborhoods, we understand how to maximize your lot’s potential while adhering to strict zoning and setback requirements. Whether you need a new master wing, a second-story “bump-up,” or a detached guest house, our team manages the entire process from foundation to final roof shingle.
Increasing square footage without losing yard space.
Specialized in Seattle’s latest Accessory Dwelling Unit codes.
Creating private, luxury retreats with integrated baths.
Designing functional, light-filled spaces for modern living.
Adding a bedroom or a master suite is the #1 way to increase a home's market value in the Pacific Northwest.
Seattle has some of the most flexible laws in the US for DADUs (Detached ADUs), allowing homeowners to create rental income or space for extended family.
Because lot sizes are small in Seattle, "Building Up" (adding a second story) is often more cost-effective than "Building Out."
All new additions in Seattle must meet strict Washington State Energy Codes, including high-efficiency insulation and window standards.
Adding square footage is a major investment. Here is why Seattle homeowners choose us:
Seattle's Department of Construction & Inspections (SDCI) has complex rules for height limits and lot coverage. We handle all site surveys and permit applications to ensure your project is 100% compliant.
We pay extreme attention to detail matching your existing siding, rooflines, and interior trim so the transition between old and new is invisible.
We are a full-service design-build firm. This means you only deal with one team for the excavation, framing, roofing, and interior finishing.
Building "up" (second story) is often cheaper per square foot because it doesn't require a new foundation, though it does require structural reinforcement of the first floor.
 Professional additions typically range from $300 to $600 per square foot, depending on whether it's a simple bedroom or a complex kitchen/bath addition.
In Seattle, permit approval for additions can take anywhere from 3 to 6 months, which is why we recommend starting the planning phase early.
For second-story additions, moving out is usually necessary. For ground-level "bump-outs," we can often isolate the construction zone so you can stay in your home.
Yes, adding square footage usually increases the assessed value of your home, which may result in a property tax adjustment.
(425) 500-0707
Professional contractors providing high-quality residential and commercial remodeling with a focus on modern style and excellence.
1414 E Yesler Way, Seattle, WA 98122
