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Top-Rated Addition to existing structure builders in Portland - Updated Nov 2026

Avatar for Superior Building Concepts LLC
Superior Building Concepts LLC
4.9(
48
)
Addition to Existing Structure - Build

Serving Portland, OR and surrounding areas

Approved

In business since 1999

Free estimates

Warranties offered

"We would highly recommend Superior Building Concepts for your next project. After many over priced quotes, underpriced quotes with a wink and a nod to do this small job without permit, or contractors that stopped by to provide a quote that we never heard from again we received a referral from Angie's list for Superior Building Construction.  Stan came by, gave us a reasonable quote then followed up with a very professional and complete contract.  We signed with Superior and were pleasantly surprised with the continued professionalism.  We received compete drawings with architectural choices.  After our selection, it was put through the permit process.  At each point we received proper communication from Stan. Once construction began, Stan was there managing the subcontractors and working alongside.  We were delighted with each subcontractor Stan brought on board.  They were all punctual, courteous and cleaned up everything after their respective jobs were complete. With Covid supply shortages you can imagine some of the issues that arose, but with each roadblock Stan communicated with us and we worked out satisfactory work arounds. This remodel was a pleasant experience and Stan and his team made the difference. You can be confident in your project if you select Superior Building Concepts."
Before
After
After
Before
Before

+8

4 neighbors recently requested a quote
Recommended by97%of homeowners
Avatar for Stellar Construction & Remodeling, LLC
Stellar Construction & Remodeling, LLC
4.8(
48
)
Addition to Existing Structure - Build

Serving Portland, OR and surrounding areas

Approved

In business since 2008

Free estimates

Emergency services offered

"Stellar Construction did a fantastic job--we are so happy we selected them from the companies we had give us bids. The final project is amazing--we literally look at it through our sliders all the time! James and Kameron worked from morning until dusk through rain and cold and left a clean job site each day. One of the many things we really appreciated was how James would listen to what we wanted, ask us questions to clarify, give us suggestions based on his experience, etc. They displayed an evident pride in their work and a genuine desire to deliver what we wanted. And they did! We highly recommend Stellar Construction and will hire them for any other home improvement project we have in the future."
Additional Photos
Additional Photos
Additional Photos
Additional Photos
Additional Photos

+54

Recommended by95%of homeowners
Avatar for Rutledge Construction, LLC
Rutledge Construction, LLC
4.9(
36
)
Addition to Existing Structure - Build

Serving Portland, OR and surrounding areas

Approved

In business since 1997

Free estimates

Credit card accepted

"WE LOVE JOSH! We initially hired him to remodel a kitchen after another contractor botched the job. Josh fixed everything and got everything finished the way it should been in the first place! We have since hired him for two more jobs: pouring a concrete driveway extension for RV parking, and replacing some siding and painting the entire exterior of the house. Josh is meticulous and clearly takes pride in his work, he is super easy to work with! I HIGHLY recommend Josh, we will continue to hire him for all of our construction needs!"
Interior finishes
Custom kitchen
Interior finishes
Mango custom cabinets
Robusta floor

+165

Response time1 day
Recommended by96%of homeowners
Avatar for TimelessBuilders
TimelessBuilders
4.9(
14
)
Addition to Existing Structure - Build

Serving Portland, OR and surrounding areas

Approved

In business since 2006

Free estimates

Emergency services offered

"There are few words to describe how pleased my wife and I were with the
work that Jay Bemis at Timeless Construction did on our recent remodel
and addition which took place in 2015- 2016.  After interviewing several
contractors we chose to work with Jay.  It was clear to me from our
first meeting - he had the ability and experience to do the job.

Our project was large in scale ($600,000 + ) technical, complicated, and
very challenging with many moving parts.   The addition of nearly 1000
sq feet to our home required the complete removal of our roof  and
rebuilding of much of the existing structure.  In addition, we did a
complete kitchen renovation, outside deck, new roof, and a concrete
patio.  Jay was responsible for all phases of the project; from
excavation, foundation, framing, electrical, plumbing, A/V etc., to the
finish work.  We were extremely happy with his eye for detail and
quality of workmanship.  

This was true, not only for himself and his crew, but for all his subcontractors. 
His crew and his subcontractors were on the job site and - on time - everyday, respectful
of my home, my family and our needs as we lived in our home as the
renovation and construction took place over 15 months.  This being my
5th remodeling experience - working with such a crew was a pleasure!

I found Jay?s pricing to be more than competitive and his input and
options to be rock solid.  He was easy to work and his constant
communication on the project was refreshing.  He was on the job site or
involved with the work underway on a daily basis. 

It is without hesitation that I would recommend Jay Bemis to anyone considering a
construction or renovation project; you simply can not do better."
Additional Photos
Recommended by100%of homeowners
Avatar for Triple D Construction, Inc.
Triple D Construction, Inc.
5.0(
11
)
Addition to Existing Structure - Build

Serving Portland, OR and surrounding areas

Approved

In business since 1993

Free estimates

Credit card accepted

"We have hired Paul and his team for several projects in the past several years, most recently for a kitchen remodel. He is professional, honest, the work is done to a high standard and we trust his judgment. He has replaced our windows, remodeled our kitchen and bathrooms, remodeled our bedroom , built a new deck and made cedar siding to match existing cedar siding on our home perfectly. We highly recommend him."
Response time9 hrs
Response rate98%
13 neighbors recently requested a quote
Avatar for Baurer Construction & Flooring
Baurer Construction & Flooring
4.9(
68
)
Addition to Existing Structure - Build

Serving Portland, OR and surrounding areas

Approved

In business since 1987

Emergency services offered

Small jobs welcome

"Looking for a contractor for your remodeling job? We give John Wood five stars. We hired John Wood of JAW Construction to transform a building shell originally intended to be a shop for building trusses into a small house (officially an auxiliary dwelling unit or ADU) and are thrilled we found him. The job required skills that extended beyond new construction to include the insight, skill and craftsmanship of a highly experienced remodeling expert. He possessed these in spades. Beyond his own expertise, he has assembled a set of sub-contractors that are excellent craftsmen in their own areas of expertise. The job was doubly challenging given that for much of the construction period we were out of state getting our old home ready for sale. This also meant that an extra element of trust was involved. John sent us pictures of the progress, so that we could monitor from a distance. In addition, he was able to identify and rectify several flaws in our design. As with any large construction/remodeling project, there were some unexpected expenses that came up, but John worked with us to help limit cost overruns, sometimes foregoing profits. He was also always up front about the costs of the various components. Our new home is gorgeous and reflects his sharp eye for detail. We couldn’t be happier. In short, if you want a highly skilled, trustworthy, hardworking contractor for your large (or small) job, we highly recommend John Wood of JAW Construction."
Additional Photos
Recommended by100%of homeowners
Avatar for Oltean Construction, LLC
Oltean Construction, LLC
4.7(
11
)
Addition to Existing Structure - Build

Serving Portland, OR and surrounding areas

Approved

In business since 2006

Free estimates

Customers say: Quick response

"We were so impressed with their team, work and value, we hired them two more times to perform additional remodel work. And we will be engaging them a fourth time within the next three months."
Laurelhurst Home Before Front View
Laurelhurst Home After Front View
Front Porch
Back View of Home
Living Room

+34

Response time4 days
7 neighbors recently requested a quote
Recommended by100%of homeowners
Avatar for Harris and Sons LLC
Harris and Sons LLC
5.0(
13
)
Addition to Existing Structure - Build

Serving Portland, OR and surrounding areas

Approved

Super Service Award Winner

In business since 2020

Free estimates

Warranties offered

"Harris and Sons Construction did an incredible job on our home addition, showing exceptional attention to detail, clear communication, and reliability. Their craftsmanship was top-notch. They kept us informed throughout the process, promptly answering questions. The project stayed on schedule, and their efficiency never compromised quality. If you are looking for a contractor who delivers both precision and professionalism, I highly recommend them!"
Kitchen
Basement
Basement
Master Bath Tub
Master Bath Shower

+27

Response time1 day
Response rate99%
4 neighbors recently requested a quote
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FAQs for addition to existing structure building service projects in Portland, OR

You can typically raise your roof by four to eight feet, depending on your home's structure and roof design. The exact amount depends on factors like roof slope and framing support. Raising the roof creates additional interior space, enhances natural light, and increases your home's value. Consult a professional to determine the feasible height increase for your home.

Yes, you need a building permit to raise your roof. Obtaining a building permit ensures your project complies with local building codes and safety regulations. A professional contractor can assist with the permit and inspection process and ensure all legal and safety requirements are met. Your contractor will be familiar with building codes in your area, which can differ between cities or states.

While it's possible to raise a flat roof, it requires extensive structural modifications. Flat roofs lack the attic space and support structures of pitched roofs, so raising them involves significant engineering to ensure safety and durability. This process can be complex and costly, so professional assessment is essential before undertaking a project of this magnitude.

The Portland, OR homeowners’ guide to addition to existing structure building services

From average costs to expert advice, get all the answers you need to get your job done.