Expand Your Living Space with a Trusted Home Addition Contractor in Washington County, OR
While a home addition is clearly about creating more space, what many Washington County homeowners don't immediately realize is its power as a strategic long-term investment. Done correctly by an expert team, a home expansion can significantly boost your property's value and overall appeal and functionality, far beyond the cost of the remodeling project itself. Cornerstone Builders brings over 20 years of specialized experience as a home addition contractor, ensuring that every new bedroom, expanded kitchen, or added living room is not just built, but intelligently designed to enhance your lifestyle and secure your home's future.
Schedule a Home addition consultation today!
Why Choose Cornerstone Builders for Your Home Addition Project in Washington County?
Building a home addition is a significant remodeling project that requires specialized expertise and meticulous planning. Washington County homeowners choose Cornerstone Builders because we offer:
Allen Tankersley, Owner of Cornerstone Builders
Award-Winning Craftsmanship
With numerous prestigious general contractor awards and over 20 years of experience, our team of professional remodelers brings unparalleled skill and attention to detail to every aspect of your home addition. We build every expansion with the same dedication and quality craftsmanship as if it were our own home.
Seamless Integration & Design
Our remodeling experts excel at designing additions that look and feel like they were always part of your home. We work closely with you to develop custom floor plan updates and designs that complement your home's existing style while meeting your new space requirements. Our advanced 3D digital models allow you to visualize your expanded space before construction begins.
Comprehensive Project Management
From initial consultation and architectural drawings to securing permits and managing all construction phases, our experienced team oversees every aspect of your home remodel. We prioritize outstanding communication, keeping you informed and ensuring peace of mind throughout the entire home addition remodeling process.
Quality Materials & Trusted Partners
We use only the highest quality materials sourced from trusted suppliers, ensuring the longevity, durability, and aesthetic appeal of your home expansion. Our strong relationships with local suppliers and subcontractors ensure efficient project execution and superior results.
Local Expertise in Washington County
As a family-owned business deeply rooted in Washington County, we possess an in-depth understanding of local building codes, zoning regulations, and architectural styles. This local knowledge, combined with our family values, makes us a reliable and trusted partner for your home addition in the Western Portland Metro Area.
Our Comprehensive Home Addition and Renovation Services
We are the Washington County Home & Room Addition Experts
Cornerstone Builders offers a wide range of home expansion services designed to meet diverse needs and create valuable new living areas. Our home remodeling experts can help you with:
Second Story Additions
Adding an entire new floor level to your existing home, providing significant new square footage without expanding your home's footprint. Ideal for adding multiple bedrooms, bathrooms, or a master suite.
This requires careful structural planning and can dramatically transform your home.

Bedroom Additions
Creating new bedrooms to accommodate a growing family, guests, or a live-in elder. This can include master suites with en-suite bathroom remodeling and walk-in closets.
Bathroom Additions
Adding an entirely new bathroom to an existing home, whether it's a powder room for convenience, a full guest bath, or an additional private bathroom for a new bedroom.
Kitchen Expansions
Enlarging your existing kitchen to create more counter space, seating, or to accommodate a larger kitchen layout with a central island. Perfect for those who love to cook and entertain.
Family Room & Living Space Additions
Expanding your common areas to create a more spacious living room, a dedicated family room, a media room, or a sunroom, providing ample space for relaxation and entertaining.
Garage Conversions & Additions
- Converting an existing garage into usable living space such as a home office, gym, or extra bedroom.
- Building a new attached or detached garage, providing additional parking, storage, or potential for an Accessory Dwelling Unit (ADU) above.
Mudrooms & Laundry Room Addition
Creating highly functional entryways or dedicated laundry spaces to help keep your home organized and minimize clutter.
Custom ADUs (Accessory Dwelling Units)
Designing and building detached or attached living units, perfect for guest suites, in-law suites, rental income, or a dedicated home office. Our expertise ensures compliance with local Washington County regulations.
Structural Engineering & Permit Issuing
Our home builder expertise includes managing all necessary structural engineering assessments and navigating the complex process of permit issuing for your home expansion, ensuring your project is fully compliant and safe.

Your Home Addition Journey with Cornerstone Builders
Our proven remodeling process ensures a smooth and successful home addition from start to finish:
01. Initial Consultation & Needs Assessment
We listen to your ideas, assess your existing home, and discuss your goals and budget for the home expansion.
02. Custom Design & 3D Modeling
Our designers create detailed plans, including floor plan updates and 3D digital models, allowing you to visualize and refine your new space.
03. Permit Acquisition
We handle all necessary permit issuing and regulatory approvals with Washington County authorities.
04. Construction & Project Management
Our skilled remodelers execute the build with precision, maintaining clear communication and adhering to timelines and budgets.
05. Final Walkthrough & Client Satisfaction
We ensure every detail meets your expectations, delivering a beautiful and functional new addition that enhances your home.
Ready to Expand Your Washington County Home?
Schedule Your Free Home Addition Consultation Today!
Don't let a lack of space limit your lifestyle. Cornerstone Builders is the home addition contractor you can trust to transform your home with a seamless and high-quality home expansion. We are the home remodeling experts in Washington County dedicated to delivering excellence in every project, adding valuable square footage and boosting your property's appeal and functionality.
(503) 567-6834Get a free consultationHome Remodeler and Custom Home Builder Serving the Entire Washington County, OR and Surrounding Areas
We offer our general contracting services to the residents of:
If your location is not listed, but you still live in the vicinity of our service area, feel free to reach out and discuss how we can help you bring your home improvement or construction project to fruition.
(503) 567-6834Get a free consultation