Create More Space in the Home You Love

  • Increase your livable space
  • Build lasting value in your home
  • Make room for work, hobbies, and family
  • Stay near your schools, friends, and community while gaining useful square footage

Our clients' average home addition budget is around $200,000. 

Our average home addition cost is $150,000. Here's why.

Home additions in Portland typically average around $150,000, with final investment shaped by structure, systems, materials, and the level of finish.

Every project involves far more than new square footage; it requires careful integration with your existing home.

Here's what you're paying for: 

  • New foundation, excavation, framing, and structural engineering
  • Integration with existing electrical, plumbing, HVAC, and insulation systems
  • Roofing tie-ins, siding matching, windows, and exterior weatherproofing
  • Interior finishes including flooring, cabinetry, tile, and fixtures
  • Architectural design, engineering, and city permits
  • Licensed trades, skilled labor, project supervision, and site management
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Financing and ROI

  • Our team guides you through the financing process to find the best funding solution for your addition.
  • Adding on is often more cost-effective than moving and allows you to keep your existing interest rate.
  • Your family experiences immediate return on investment from day one, transforming cramped quarters into comfortable living space and finally enjoying your home instead of feeling confined by it.
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Happy Customers

Home Addition Client Testimonials

 

Lamont Brothers did a major 2 story addition/remodel job for us last summer, and we could not be happier with the work that they did.

We had a second floor room added, one other second floor room expanded and a closet added, a roughed in bathroom added, a main floor bedroom expanded and the main floor layout completely changed, including a full bathroom remodel.

Opening up an older house is always difficult, and complicating the work was the fact that we lived in the house for most of the construction.

We look forward to having them back to complete additional projects (kitchen and bathroom remodels) in the future. We've got nothing but good words about these guys.

– Alan R. | Houzz Review

We used Lamont Bros. to do a major addition on our home. We added about 225 square feet to a 90 year old home. 

It's amazing how the home looks like it's been that way forever.

It all tied together just as we envisioned it and it even managed to surprise us in the ways it beneficially impacted the way we use other spaces in our home.

– Nick H. | Google Review

The Lamont Bros. built an addition on our house about 4 years ago.

They helped us refine our plans, they got all the permits, and they did a great job on the addition.

We were very impressed and satisfied with the performance of this company, and wouldn't hesitate hiring them again.

– Craig J. | Google Review

Watch Now

Here's How Our Home Addition Process Works

 

 

The Lamont Bros. Difference

Award Winning Craftsmanship

Lamont Bros. has earned recognition as a multi-award-winning Portland design-build firm, including the NARI Remodeler of the Year award and Houzz Best Service every year since 2016.

Client-Verified Excellence

Lamont Bros. has a 4.9 star rating across Google, Houzz, and Yelp, reflecting consistent client satisfaction across hundreds of completed remodeling projects.

20 Years of Experience

Since 2008, Lamont Bros. has completed 850+ remodeling projects across the Portland metro area, including kitchens, bathrooms, additions, and ADUs in Portland, Beaverton, Lake Oswego, West Linn, and Oregon City.