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    Kobolt Construction

    4.8 (26 reviews)
    Closed 8:00 am - 5:00 pm
    Updated over 3 months ago

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    Response rate

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    Services - Kobolt Construction

    Building additions

    Guest house or ADU construction

    Detached garage construction

    5 More Services

    New structure construction

    New room addition

    Bedroom addition

    Garage addition

    Kitchen addition

    Kobolt Construction Photos

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    Recommended Reviews - Kobolt Construction

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    Reviews With Photos

    Vivian N.

    Kobolt construction did my ADU and I could not happier. Nelson was the reason for my happiness. He converted my 2 car garage into a living space, have kitchen, bathroom, island. He gave me the statistics of the job weekly and suggestions. You don't even have to monitor him and his team work. Start on time and clean up his work. Any difficulty, he keep you updated. I trusted Nelson so much, I even took 3 weeks vacation over seas. He kept me in communication either via text or email the process of the project Nelson even offered to go down to city hall pick up the second permit for me. He did beyond a contractor's job and very professional. Because of all this I gave him work from my house that I had originally contracted through someone else, and of course I was extremely grateful that I did! All of my friends and guests have complimented so much on his work. I have and continue recommending Kobolt Construction mainly because of Nelson to all of my friends or anyone who need to remodel their house. He is the type of person that takes so much pride in his work and reputation. He continously kept me informed step by step, doesn't skip or try to do fast, exceptional job and character. I feel confident that anyone I refer him to, will experience the quality and professionalism that I was blessed with. Thank you Kobolt... Thank you so very much Nelson!

    A flat roof with vents and construction tools, overlooking a neighborhood with houses and trees.

    We are very glad to contact Nelson, who is owner of Kolbot Construction company, to repair our roof. We are very happy to work this company which I can trust. Their work is the excellent quality. First time we meet him, he is very friendly and very professional. After he took a look the roof then he worked on the proposal at same day and gave us all the detail what he was going to repair and how much it cost. Moreover, he will give you advice for the best solution. He also help to work and submit on permit and attend on city inspection day. He is experienced contractor and very communicative. He keep us in communication through the text and email very well. I very appreciate on his team work. I think it is very hard to find contractor like Nelson so I think I would recommend him if you have any type of construction work. Again, trust me - Kolbot Construction is the best. Nelson - Our family is very happy to work with you and we will contact you again for any type of construction work in the future. Thank you Nelson.

    Kitchen before the remodel--old cabinets, 70 style lighting - A kitchen featuring white brick walls, wooden cabinets, a stainless steel refrigerator with magnets, and a ceiling with bright fluorescent lighting.
    Cc L.

    Short summary: Hire Nelson and team if you want a contractor that you can trust and will be honest with you. I needed to renovate my mom's house that has not been touched in about 30 years. The kitchen was old and dark. She had old lighting , kitchen cabinets that were small and her baseboards were destroyed by our old dogs. Her bathrooms were not any better where in her master bath--none of us could work the shower, water didn't drain that well, she had some old electrical heater in the wall that when you accidentally turned on it would spark. The hall way bathroom wasn't any better with an old vent that leaked water, toliet that was loud, bathroom cabinet that was so low that made you feel like a giant. My mom knew she needed to fix up the house but didn't want to or thought she could get some cheap fix in the house. Also we decided to do this during a pandemic!! I finally convinced my mom that work needed to happen in her house and started interviewing contractors. I'm going to say that Nelson stood out b/c of the following--he was straight forward, he listened to what we wanted, he measured in a manner that was so detailed oriented compared to all the other contractors ( FYI he's a civil engineer!) and he knew what he was talking about and would gently steer us from some of our stupid ideas! Simple things around what type of material works best in a shower so that its not slippery! that makes a difference since all i kept seeing was my mom slipping on her shower!! Also when he provided the estimate, he also included renderings of the renovations so that we could make sure that we were aligned completely. The other complexity to this renovation was that I needed a contractor that i can trust and communicate with from Northern California. As stated, this work was happening during the pandemic and to be safe, we had moved my mom up to NCAL so she would not be compromised. This mean that communication was going to be critical to make sure that Nelson and i were on the same pages during this renovation. Renovation: I'm going to say communication, project management was absolutely ideal. i got daily updates and when there was questions nelson always reached out and vice versa. My initial feelings of am i doing the right thing disappeared as i saw the progress being made in demos and renovations. Also Nelson provided a weekly summary of what was completed and not completed. Unexpected work--replacement of pipes in the entire house!! We did have a major unexpected work in the house which was replacing all of my mom's house pipes. They were steel pipes that were disintegrating and something my mom already knew b/c her pipes kept getting blocked especially when she had family over at her house. She knew b/c she would call someone to snake the pipes every couple of months. I mean we honestly thought she wouldn't let us use the dishwasher b/c she was being the asian mom. The case was that the water wasn't draining. Nelson called me about this b/c he took the effort to get a camera to snake the pipes and showed me the results. he gave me couple of options but based on what he showed i knew that the pipes would need to be replaced. I will also say that this was a situation that almost made me fly during the pandemic but had my uncle go over to check out the situation and agreed that we needed to replace the pipes. you can see pictures of the scope of work but i will say after getting it done, there is a piece of mind about the house. the plumbing is amazing where we can now run all the showers, laundry, and dishwasher w/o worrying that something was going to get backed up!! (cuz prior it did happen!) overall work results- We love it! you can see in the pictures the 80% finished product (FYI i forgot to take pictures of the final product!) Nelson was a great partner in making recommendations from tiles, cabinet, hardware, etc. Without him it would have been impossible of having this completed while being 400 miles away and in a pandemic. He's team followed all the COVID protocols and were extremely neat and tidy. If you want a contractor that can project manage, communicate really well, and take pride in their work then hire KoBolt construction. They really can do everything and his team is amazing. I will definitely use them again but my mom who is extremely picky loves her new kitchen and bathrooms! She loves cooking in her new kitchen!!! She keeps saying how much bigger and brighter it feels! Also if you want more details-please message me. I can share more details but loved working with nelson and team.

    Two photos showing plumbing pipes, including PVC and copper, installed in a building's interior or crawl space.

    Don't Hire Nelson and Kobolt Construction! I hired Kobolt to redo a guest bathroom. Day three of my project Nelson comes screaming into my home "are you going to let my guys work today"! His workers arrived before he did. I simply ask them if they could use the thicker plastic over some open walls. This bathroom was connect to a guest bedroom. Mind you I payed extra for this and it wasn't done on day one. So when the guys showed up on day three I polity ask if they would please try and protect this bedroom. Brandon his tile guy apologized and was covering the room. There was also a 6 foot strip of carpet that wasn't covered at all. Not sure why...I've done many remodels and I know it's simple/easy to lay down proper protection on the whole area. Not just part of it. I was starting to thing this isn't going so easy. Already he's blowing up at me. Day five I had enough of his arrogance. He doesn't apologize for anything instead he blames me. We parted ways! I paid him 3k. Now the real nightmare begins. The new plumbing that I paid him to do. Re-route 4"ABS drainpipe, add new toilet 3"ABS waste pipe, re-route master bathroom 2"ABS drainpipe add 2"ABS vent pipe. Pex hoses for hot and cold water. So a month or so go by. We hire a new contractor to remodel this same bathroom. This bathroom was demo down to the studs and the new plumbing is all that Kobolt did before we parted ways. New contractor pulls up the subfloor and finds a complete disaster with regard to the plumbing Kobolt did. The Pex tubing are missing all the "o" rings. The ABS with reverse level major issues which wouldn't have drained properly. All the plumbing Kobolt did was ran incorrectly and had to be demo out and re-ran correctly! Here are the pictures to show this awful, incorrect plumbing job Nelson and Kobolt did!

    Gazebo Project
    Chris S.

    If you are reading this I am going to just start off by saying. Ask Nelson and his wife, (its a family business), to give you an estimate and then hire them. It will be the best experience you will ever have with a contractor. Trust me, I am a son of a contractor and Kobolt Construction is way better then ANY contractor that I have worked with, yes including my Father. Here is why I hired Kobolt Construction and will again. Recently my wife and I had our first kid so we needed more outside space and storage and I had no time to build it. So Nelson came and gave me a fair bid to remove an old concrete slab and poor a new one plus build a shed and a large Gazebo to fit the style of my Craftsman house. Not only does Nelson have an engineering background, his crew was super smart and skilled as well. But the best part was Nelsons attention to detail and communication. Really, he checked in with me everyday, showed up when he said he would, cleaned up every day and even sent me photos of the project when I was out of town on business. Total class act and super professional. Plus to top it all off, when the job was done Nelsons wife stopped by and brought us flowers for our new space, Who Does that still!!!!! So again, long story short. Stop looking and start hiring Kobolt Construction. P.S. he is a fellow Fullertonian as well.

    Parissa E.

    Listen - if you're like us, you're looking to find a great and reliable contractor for your project. Lucky for you (and us) - there's Nelson and his team at Kobolt Construction. We sought out estimates from four contractors for the addition and kitchen/bathroom renovation to an older home we had recently purchased. Three of the four contractors handed us one to two pages with vague descriptions and an estimate. Nelson called us and asked detailed questions. He provided a thorough 15 page estimate that read like a book - from foundations to finishings. Nelson takes so much time to fully understand a project and his estimate was spot on. We were recommended to Nelson and his team and feel so lucky to have found him. There were no surprises in costs and the only additions to that original estimate were from unexpected issues (what we thought was a wall but was just a pocket door or an uneven flooring in living room due to the age of the home) or from additions we wanted added to the project (recessed lighting in all rooms and new HVAC system). Nelson is detailed and dedicated in his work. He will always be honest and direct, and provide advice when needed but respect your decisions. His integrity is seamed into the quality of his work - and the results show it. And then there's his team - knowledgeable and kind - these guys are the best. Shout out to Walter, Brandon, Andy and the rest of the team! We got to know these men through the course of their time and they're just the best. Brandon did the amazing tile work in our bathrooms that everyone just raves about. These guys do quality work and are respectful and kind. It just doesn't get any better than Nelson and the team at Kobolt. Our home renovation was such a success - and we're already planning to work with this team on the ADU. Do yourself a favor, and work with Nelson and the Kobolt team. They build beautiful and safe projects with skill and integrity. Absolute men of their crafts and we are just beyond grateful for the stunning home they've created for us.

    Experienced contractor, extremely reliable and communicative! Nelson and his crew performed our master bath total remodel and framed an extra closet in the bedroom. Yes, there were some hiccups and bumps along the way (which happen with all jobs), but they were manageable. At the end of the day, I couldn't be happier with my new sanctuary! Nelson does his best to ensure you're happy with the work. His guys are also reliable and trustworthy-- his right hand man, German, is the best!

    Custom Shower with Pottery Barn Vanity installed beautifully

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    Thank you, Raphael! We enjoyed working with you as well.

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    Nelson M.

    Thanks so much Lillian, it has been a pleasure to work with you.

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    Ask the Community - Kobolt Construction

    There is a leak from possible exterior wood rot that is causing a windowsill to get wet and the plaster to peel. Would you be able to pinpoint (e.g. using thermal imaging) where the leak is and repair/replace the old rotted wood? Thank you!

    Hello, Do you folks ever work on remodel of a mobile home ? I inherited my father's in San Juan Cap.…

    Hello Joann, We have not worked on remodel of a mobile hoem to be completely honest. I am sure is the same as fixed homes, but we do not service San Juan C. though, I am… Read more

    I am the minister of a church looking to find a good home for pews we no longer need. We will removing a large number of wooden pews some of them are 24 ft long. Would you be interested in them? My church is in Fullerton CA.

    Hi Mandye, Unfortunately we would have no use for church pews. Maybe a local new church in the area might want them, or you could advertise them for free on Craigslist or… Read more

    View All 4 Questions

    Review Highlights - Kobolt Construction

    Nelson also has a team of incredibly talented guy's that accomplish more in a day than I thought possible.

    Mentioned in 23 reviews

    Read more highlights

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    It was time to replace a deteriorating privacy fence at my home. I decided to replace it with a…read moreblock wall in order to minimize future maintenance. It was shared fence with two other neighbors and they agreed to share in the cost. I asked four different Companies to bid on a new cinder block wall. In the end only two Companies provided quotes. The prices were similar. I chose National Concrete based upon Brian La Fuente and his honest and straight forward approach. The project consisted of demo an existing wood fence and build a 219 linear feet cinder block wall with Orco split face blocks. The National Concrete team for my project was 3 highly skilled and very efficient craftsmen. I was amazed at the fast pace of the work for only three guys. They did not take short cuts. The crew worked straight through on the job. In the end it took four weeks to complete the fence including all city inspections. I think the work quality was top notch. Brian La Fuente and the guys at National Concrete were reliable and a pleasure to work with. Brian and the crew were always respectful and very responsive to my requests during the project. Very pleased with the end result. I would highly recommend Brian and the National Concrete crew for your concrete project.

    I am very satisfied with Brian and his team's work on the project. Highly recommend to anyone who…read morewants quality work, as well as reliable and pleasant service experience. Brian was ~7 mins earlier waiting in his pickup truck when we met onsite for the first time. He was polite, professional, and he listened very carefully. He got back to me by EOD first day we met whether my original plan needs a city permit or not, as well as all the additional expenses and the timeline. I interviewed 3 other contractors for the same project before Brian. All of them gave wishy washy answers when I asked about permit. Brian was the only one who provided me clear and professional answer to this question. I knew I would work with this gentleman at that very moment. As to time management, Brian was also great. He started working on the project on the exact day he promised, and finished it as scheduled as well. When there was any change, he would keep me posted without me having to ask anything. I appreciate this very much, as I waited for months beyond the original start date with another contractor who seems popular on Yelp, yet ended up being told to find someone else cuz he was too busy. Several months were wasted and everything got more expensive at that point. Brian is very responsive and thorough. He has very high standards for himself as well as the team. Whenever you raise a concern, he'll deal with it instantly and deliver results. He really means it when he says he wants everything perfect. You can tell he really enjoy doing what he's been doing and is very good at it. We got so much compliment from neighbors when the project is completed. Even some strangers passing by would stop to say "Nice work". I would have no hesitation to recommend Brian and his team to anyone.

    Kobolt Construction - contractors - Updated May 2026

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