Home Remodeling Boulder CO

GJ Koeppen Construction provides basement refinishing, remodeling and renovation services in Longmont and Boulder, CO. Call us on 720-378-7660 for more details.

Company Details

  • Founded 2000

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GJ Koeppen Construction LLC

Officially VerifiedConstruction and Remodeling

Phone

Address 7845 Lookout Road, Longmont, CO, USA 80503

Business on Google Map

  • Onsite Services Provided

  • Offers Online Estimates

Reviews for Koeppen Construction

5 9 Reviews

  • 5
  • 4
  • 3
  • 2
  • 1
  • Brian Cox

    July 16, 2025

    Koeppen construction did a remodel of our basement and partial remodel of our kitchen. We were extremely impressed with the level of professionalism and knowledge, the quality of contractors and subtractors and especially their integrity, transparency and communication. Graham's team from the office staff to the site supervisor and carpenter's are excellent at their jobs and genuinely care about clear communication, attention to detail and problem-solving. Graham and Joe did an excellent job of listening to what we wanted but also provided intelligent, practical suggestions that were extremely valuable. Because Koeppen has worked for a long time in this community they have developed excellent resources for subcontracting or finding suppliers at competitive prices and understand how to navigate through the permitting process. In my experiences, all construction projects will encounter unexpected obstacles - the reason to hire qualified professionals is that they can successfully problem-solve and adapt or figure out work arounds. Koeppen handled every issue that arose and stood by their work. Highly recommend. Brian Cox

  • Jennifer Fick

    October 28, 2024

    I highly recommend Koeppen Construction! We did a complete remodel of the entire first floor of our home and are very pleased with the results. Graham and his team were very responsive and have excellent attention to detail. We will definitely use them again when we are ready to remodel our second floor.

  • Melissa Swan

    October 16, 2024

    We could not be happier with our basement! From start to finish we felt confident our vision was going to be made into a reality. During the build the team offered suggestions for a more professional finish that we hadn’t thought of, even if it meant more work for them. With any type of construction, obstacles will pop up. This team took the time to discuss and find a resolution that matched the quality of the rest of the project instead of just throwing together the “easiest” fix. I am very thorough person when paying attention to details. It was communicated in the beginning the extreme importance I was placing on a cohesive aesthetic. I wanted to match construction in a space 18 years after original construction. I did not want my project to look like an afterthought. GJKoppen absolutely accomplished that -which was not an easy feat! A great amount of time and effort was made in researching fixtures and finishes as well as tracking down obscure items that had been discontinued. We receive raving compliments on the workmanship from anyone who sees the space. This team genuinely cares about making their clients happy which seems rare these days. It is obvious they take pride in their work and it shows in the final product. They are all gems and we could not have made a better choice.

  • Brenda and Bob Taylor

    October 09, 2024

    We just finished a major kitchen remodel with Koeppen Construction. Our dark, small, dated 1970s kitchen was transformed into a bright, beautiful and open kitchen. The remodel also included surrounding areas - a bathroom, a laundry area and a front room. Graham Koeppen created a wonderful design for our space. He thought of things we would never have thought of and as a result, we have a kitchen that I am excited to cook in and to share with family and friends. We were very impressed with all of the workers who worked on this project! They were all very skilled, punctual, respectful and cleaned up every day! Even the subcontractors that Koeppen used were great to work with. We also appreciated the communication throughout the whole process. Our project manager, Joe, was great! Many times he stayed later or came in extra to work on something that needed attention. He always took care of any concerns I had! And Niki was truly awesome! She always followed up with me or whoever was needed to remedy any issue at hand. She was quick to address my concerns and to answer my "silly" questions! I appreciate her "holding my hand" throughout this whole process, as I had never been through a remodel before! We will continue to recommend Koeppen Construction to our friends. Thank you to all who had a part in creating our dream kitchen. It far exceeded our expectations! Brenda and Bob Taylor

  • Dave Sehnert

    April 08, 2022

    I have hired GJ Koeppen for three major projects and a couple small projects over the last 4 years. The attention to detail, responsiveness to issues as they (inevitably) arise and collaborative approach to resolving challenges are remarkable. My wife and children always felt comfortable with the team members in our home and they leave a clean workspace at the end of the day. I highly recommend GJK for any of your home improvement projects!

  • 5
  • 4
  • 3
  • 2
  • 1

Reviews for Koeppen Construction

5 9 Reviews

  • 5
  • 4
  • 3
  • 2
  • 1
  • Brian Cox

    July 16, 2025

    Koeppen construction did a remodel of our basement and partial remodel of our kitchen. We were extremely impressed with the level of professionalism and knowledge, the quality of contractors and subtractors and especially their integrity, transparency and communication. Graham's team from the office staff to the site supervisor and carpenter's are excellent at their jobs and genuinely care about clear communication, attention to detail and problem-solving. Graham and Joe did an excellent job of listening to what we wanted but also provided intelligent, practical suggestions that were extremely valuable. Because Koeppen has worked for a long time in this community they have developed excellent resources for subcontracting or finding suppliers at competitive prices and understand how to navigate through the permitting process. In my experiences, all construction projects will encounter unexpected obstacles - the reason to hire qualified professionals is that they can successfully problem-solve and adapt or figure out work arounds. Koeppen handled every issue that arose and stood by their work. Highly recommend. Brian Cox

  • Jennifer Fick

    October 28, 2024

    I highly recommend Koeppen Construction! We did a complete remodel of the entire first floor of our home and are very pleased with the results. Graham and his team were very responsive and have excellent attention to detail. We will definitely use them again when we are ready to remodel our second floor.

  • Melissa Swan

    October 16, 2024

    We could not be happier with our basement! From start to finish we felt confident our vision was going to be made into a reality. During the build the team offered suggestions for a more professional finish that we hadn’t thought of, even if it meant more work for them. With any type of construction, obstacles will pop up. This team took the time to discuss and find a resolution that matched the quality of the rest of the project instead of just throwing together the “easiest” fix. I am very thorough person when paying attention to details. It was communicated in the beginning the extreme importance I was placing on a cohesive aesthetic. I wanted to match construction in a space 18 years after original construction. I did not want my project to look like an afterthought. GJKoppen absolutely accomplished that -which was not an easy feat! A great amount of time and effort was made in researching fixtures and finishes as well as tracking down obscure items that had been discontinued. We receive raving compliments on the workmanship from anyone who sees the space. This team genuinely cares about making their clients happy which seems rare these days. It is obvious they take pride in their work and it shows in the final product. They are all gems and we could not have made a better choice.

  • Brenda and Bob Taylor

    October 09, 2024

    We just finished a major kitchen remodel with Koeppen Construction. Our dark, small, dated 1970s kitchen was transformed into a bright, beautiful and open kitchen. The remodel also included surrounding areas - a bathroom, a laundry area and a front room. Graham Koeppen created a wonderful design for our space. He thought of things we would never have thought of and as a result, we have a kitchen that I am excited to cook in and to share with family and friends. We were very impressed with all of the workers who worked on this project! They were all very skilled, punctual, respectful and cleaned up every day! Even the subcontractors that Koeppen used were great to work with. We also appreciated the communication throughout the whole process. Our project manager, Joe, was great! Many times he stayed later or came in extra to work on something that needed attention. He always took care of any concerns I had! And Niki was truly awesome! She always followed up with me or whoever was needed to remedy any issue at hand. She was quick to address my concerns and to answer my "silly" questions! I appreciate her "holding my hand" throughout this whole process, as I had never been through a remodel before! We will continue to recommend Koeppen Construction to our friends. Thank you to all who had a part in creating our dream kitchen. It far exceeded our expectations! Brenda and Bob Taylor

  • Dave Sehnert

    April 08, 2022

    I have hired GJ Koeppen for three major projects and a couple small projects over the last 4 years. The attention to detail, responsiveness to issues as they (inevitably) arise and collaborative approach to resolving challenges are remarkable. My wife and children always felt comfortable with the team members in our home and they leave a clean workspace at the end of the day. I highly recommend GJK for any of your home improvement projects!

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Established In: Mar 10, 2000

Years in Business: 25

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