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

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

Serving Lake Oswego, 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."
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+8

3 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 Lake Oswego, OR and surrounding areas

Approved

In business since 2008

Free estimates

Emergency services offered

"We hired Steller Construction and Remodeling LLC to build a deck/Catio in May 2024. Micha (the Owner) was straightforward to work with and reach throughout the process. We are retired and live on a set income. Even though we had some lower estimates from other companies, we felt so confident with Micha's (the owner) ideas that, after looking at other reviews/images of this company, we decided to go with Steller Construction. Micha's team was absolutely amazing !!! Ray, our project's lead employee/carpenter, was very knowledgeable, considerate, and had an unbelievable work ethic! The rest of the team did an awesome job as well. They communicated well throughout the whole job always checking in with us to make sure they were doing what we wanted. They were professional and very polite everyday. At the end of each they completely cleaned up the area. We have worked with one other construction company and a roofing company when we did some remodling on our last home and did not have a good experience with either company. We were very nervous about having to go through another bad experience. We were so pleasantly surprised that Steller Construction turned out to be a great decision! Our deck/catio is beautiful and we love it! If you have any construction/remodeling needs contact Micah at Steller ConstructionI you will not be disappointed!"
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+54

Recommended by95%of homeowners
Avatar for Serden Group, LLC
Serden Group, LLC
4.9(
211
)
Addition to Existing Structure - Build

Serving Lake Oswego, OR and surrounding areas

Approved

In business since 2005

Free estimates

Emergency services offered

"I did A LOT of research for three bathroom projects and chose Serden Group, because the team is knowledgeable, honest, kind, affordable, and most importantly the type of people I can have in my house for months during long renovations. I appreciate their integrity, attention to detail and making my needs a priority. Looking forward to them building my new ADU!"
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+121

Response time1 day
Response rate85%
48 neighbors recently requested a quote
Avatar for TimelessBuilders
TimelessBuilders
4.9(
14
)
Addition to Existing Structure - Build

Serving Lake Oswego, OR and surrounding areas

Approved

In business since 2006

Free estimates

Emergency services offered

"Overall Jay is excellent. He is responsive, always answers texts or phone calls quickly and generally does what he says he will do. Like all construction projects there were small issues along the way but Jay got on top of them and addressed them quickly. Site was clean during construction work, his subs/trades were all good, nice people, skilled workers who did excellent quality work. Overall this was done well and in an acceptable timeframe. I think generally construction could have been executed quicker, there were a few times when no-one was working at the house that could have shaved some time. But, given my extensive experience with construction Jay is one of the good ones ! His estimate was high but he came in well under it and within sight of what I expected things to cost. I will (I am) definately using him again..."
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Recommended by100%of homeowners
Avatar for Triple D Construction, Inc.
Triple D Construction, Inc.
5.0(
11
)
Addition to Existing Structure - Build

Serving Lake Oswego, OR and surrounding areas

Approved

In business since 1993

Free estimates

Credit card accepted

"Great team to work with, quality work, they go out of their way to please the customer. We were doing a living room and front deck expansion project and Paul and his team delivered a beautiful completed project and on budget. I have already recommended Triple D to two other friends for assisting them with their current projects."
Response time9 hrs
Response rate98%
14 neighbors recently requested a quote
Avatar for Baurer Construction & Flooring
Baurer Construction & Flooring
4.9(
68
)
Addition to Existing Structure - Build

Serving Lake Oswego, OR and surrounding areas

Approved

In business since 1987

Emergency services offered

Small jobs welcome

"John and Brian of JAW Construction did a complete interior refresh of our mid 1970’s split entry ranch house. They removed two walls to open up the main living area, added two new windows to allow more natural light in and installed new lighting throughout. All the flooring was replaced with hard wood upstairs and LTV downstairs. They replaced every door along with all the trim in the house. They installed a completely new custom kitchen, remodeled both bathrooms, laundry room and added a wet bar area as well as resurfacing two fireplaces. In short they touched every surface inside our house. John, Brain and all of their subs were easy to work with, professional and helpful throughout the 3 month construction project. They were able to work around the inherent flaws of an older house and were accommodating went we changed our minds and asked for changes. They really did work to fulfill our vision for the house. We are very happy with the fit, finish and overall quality of their work and would highly recommend JAW Construction."
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Recommended by100%of homeowners
Avatar for Oltean Construction, LLC
Oltean Construction, LLC
4.7(
11
)
Addition to Existing Structure - Build

Serving Lake Oswego, 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."
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+34

Response time4 days
6 neighbors recently requested a quote
Recommended by100%of homeowners
Avatar for Kolt Construction, LLC
Kolt Construction, LLC
5.0(
11
)
Addition to Existing Structure - Build

Serving Lake Oswego, OR and surrounding areas

Approved

In business since 2023

Free estimates

Credit card accepted

"I can tell you that Kolt Construction is amazing! They did some remodel work for me and I couldn't be happier. Austin were very detail oriented and communicative. The quality of their work is top-notch. If you're looking for a reliable construction company, definitely give Kolt Construction a shot!"
5 neighbors recently requested a quote
Recommended by90%of homeowners
Avatar for MSW Remodeling, LLC
MSW Remodeling, LLC
4.9(
12
)
Addition to Existing Structure - Build

Serving Lake Oswego, OR and surrounding areas

Approved

In business since 2023

Free estimates

Customers say: Terrific value

"They arrived on time, quickly understood what I wanted, made suggestions and provided a bid within 24 hours. They arrived on time, kept in contact with me throughout the process and worked with me on additional work. They cleaned up the area and even helped me clean out the work area and put everything back! Easy to work with, communicative and professional!"
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+30

Response time40 mins
1 neighbors recently requested a quote
Recommended by75%of homeowners
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FAQs for addition to existing structure building service projects in Lake Oswego, 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 Lake Oswego, 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.