I wanted to update my review specifically regarding communication and the estimate. Willie followed up and made the time to come out for an estimate even during an important personal milestone, which says a lot about his professionalism. I think his estimate was fair, it was detailed and he included some specifics that we needed for our lender. Unfortunately our escrow was canceled but we would look to him again for services in the future. read more

Quantum Consteuction has amazing customer service. I can say that Willie the owner gets back to potential customers and has valuable knowledge in the field. He has helped me twice when I was in a pinch. He is fair and honest. read more

We completed an ADU rebuild with Quantum and it has easily costed us more than what we got out of it. It boils down to a lack of craftsmanship and ownership. The team doesn't have the skills or leadership necessary to carry out a full ADU build (or similar sized projects). We've dealt with several leaks, mold, and now sewage. Despite sending several messages to have this fixed, we're getting no responses. Not to mention, none of the permits were really done properly after project completion which was a huge amount of work to do myself. Please save yourselves the money and heartache and look elsewhere for your construction needs. read more

Recently purchased a home that needed some attention prior to moving in. Willie (owner) and his team did an amazing job with our upgrades and renovation. After the job was complete he was also kind enough to get us a house warming gift (cooking pan set). The little things that count and that was an awesome gesture. Would highly recommend, and we will definitely be calling them back for future home improvements. Thanks Willie! read more

See all

This guy is the goat he was super reliable and helpful I would definitely would call Willie again if I need a another project for him to fix

I contracted Quantum Construction to start an ADU Build project, which involved tearing down my rental property garage and also adding additional square footage. Because of the additional square footage add, it was more complex than a traditional Garage-ADU conversion. Willie was my main contact and was professional and courteous throughout the entire process. He was patient with me whenever I had a multitude of questions and knowledgable about all aspects of the construction process. Whenever there was an issue in our plans, Willie offered feedback and options to make sure I could make an informed decision. Though the process was long, Quantum Construction and Willie did a great job throughout the entire time and I'm very satisfied with the end, quality product of my ADU Build. The team addressed all my concerns and I'm very pleased with the final product! read more

Quantum Roofing took down our roof on a Tuesday. Everything sounded good until the surprise rainstorm came through. I called them and told them it's raining and we have nothing covering the roof! He came out the following day and we had water damage in outlets, drywall, insulation, blinds, and walls. At first Willie (the owner) sounded like everything would be good as new once they fixed it. After talking to some of his workers I found out they told him to cover the roof and he chose not to, very disappointing to find out. Then the roofing continued. We ended up getting about 16 punctures into the interior drywall while they were nailing down the new material. 6 of those are still visible after "patchwork". The paintwork is shoddy as well. The paint doesn't match in my sons room or the living room where most of the damage was. There is loose drywall above the cabinets where there was water damage and I confined it wasn't replaced. Lastly I have 6 new cracks in the kitchen drywall where there were no issues before. I would not recommend. read more

See all

I had 4 companies quote a bathroom remodel, and Willie was the only one who actually listened to what i wanted as gave me a quote for such, rather than quoting what they thought i should do. He was on point with our price range, and worked with us every step of the way. we started with a hole in the ground, and Willie and his crew gave us an amazing bathroom, even better than I envisioned. Working with him and his team was a dream, and I'm excited to get started with our next project. read more

See all

I needed two very large windows replaced and I'm very happy with the work! There was some wood rotting below the old frames and it was caught by the crew so we decided to reinforce everything and it only took one day... I was shocked and amazed by the work the paint matching the color in the room perfectly! Highly recommended!! read more

Look no further, Willie and his team will make your dream remodel come to life at a very affordable rate! I've worked/hired other contractors, and I wish I had hired Willie and his team to do all of my home remodel projects. Why? Because Willie goes the extra mile to make sure his clients are happy. Throughout the entire process, he checked in with me and got my feedback. He came to my house everyday to ensure quality work from his team. Willie is honest and a straight shooter. I'll be hiring Willie to do a few more projects next year! read more

See all

Completely in LOVE with my new kitchen!! This was the biggest project we have ever done. We had a bad leak in our kitchen that caused extensive damage during the pandemic. After several bids, we went with Willie and his team. The moment Willie came to see my project I immediately felt comfortable and trusted him to do the work. The thing that I most appreciated was Willie's responsiveness. If I called or texted it was always an immediate call or text back. He always ensured everything was done, with attention to detail and making our vision come alive. Willie was always honest with us right up front with costs so we could budget appropriately. It made the whole process less stressful during a stressful time. Whenever I walk into my kitchen I can't believe it's ours. It's exactly what I always wanted and I truly thank Willie and his team for a job done most excellent and amazingly. We are already lining up more things for him to do in the future. If you're looking for someone to do great work, Quantum Construction & Design is the place to go. Needless to say we are very ecstatic with the results!! I posted some before and after pictures to demonstrate the amazing transformation!!! read more

See all

Called a couple different places for a free estimate on remodeling part of my home. This guys came out said they could do the job and for a price that I couldn't say no to. Yes the estimate was a little high but I'm not one to pay for cheap things I like the fine things. The good things. With that being said. My house gotta look perfect!! So I hired there team. Signed the agreement and they got to work!! I'm glad I hire this guys they sure got good taste. They gave me ideas for the remodeling and let me tell you i am so happy with the finishing product. Thanks to Will and he's team!! Absolutely recommend them to anyone looking to remodeling there home. read more

Highly recommended! Definitely worth the $$.. They came in as soon as I needed them and did the job done quickly, I voiced a concern and they took care of it right away.. here are some before and after from 1 of 4 rooms.. read more

Quantum Construction & Design - After - General Contractors Near Me - Los Angeles, California

See all

I would like to start this review letting everyone know that Willie and Jesus were not hired to re model my home simply because I could not afford them. I have a large re model job that moves the kitchen to the back corner of the house, knocks out a few walls in the living room, adds a small wet bar, adds a master bed/bath/walk in closet, extends a bedroom in the front of the house, re models an existing bathroom and adds a new front portico, with lots of roofing to be done. These two guys came to my home and met with my wife and I and seemed really down to earth, and seemed very professional. Due to reading reviews on them not meeting appointment times, I have to note they were a few minutes early for the appointment. What I gathered from these guys is they are building a new partnership, they are willing to work any job at the right price, and they want to get the job done correctly and the customer to be fully satisfied with the job after completion. I interviewed 4 contractors to include them, they were the third highest bid over 65k higher then the second, the highest was 65k over theirs. The first and second place bids were 4k off each other's prices. I think they would of done a fine job, but just way over budget for my family and I. I thought I should leave a review for these guys because they took the time to come out and speak with my wife and I, and they seem like good people, maybe they just got this once off a little. read more

They recommend me this company by a mutual friend, but disappointed that he missed an appointment without any call or text, left work early to meet and no show! I texted to reschedule & did not reply with date. It's disappointing that on social media they seem very professional but it's all for the views I guess or they choose which clients they want to work with or not, They should just be honest and simply say they are too busy or not looking for new clients , for reference I spoke to Willie! read more

The construction company consistently delivers high-quality workmanship. Their attention to detail and precision in execution is commendable. From the foundation to the finishing touches, their work reflects a professional and skilled team. read more

First Meeting Was between 3-4 pm , person called and canceled at 3:45pm saying he had an emergency ‍ I mean if it was really an emergency why are you just calling , I waited all day for an estimate to them waste my time , so now I'm thinking like NO I don't want this typa flake rebuilding my home nooooo thanks read more

Willie and his team were all very professional and I'm happy with their work. One of the things I was concerned about at the start was that there would be breaks inbetween. I heard several horror stories how a contractor was hired and in the middle, there would be a week break when no one would show, then another break and another... that wasn't the case here. Willie explained to me, he never takes on more than 4 jobs at a time to ensure he would always have the manpower to complete each job quickly. My kitchen took 5-7 weeks including demo, plumbing, electrical, finishing details, etc. I can't count how many times there would be an installer or a painter and I would ask things like, since you're painting, can you paint this other wall too or since you since you're putting up drywall, can you please fix this other wall where there was a hole or two from the provious home owner. Another example is sometimes, he would leave his dumpster trailer on our street and I would ask if I could throw some other things away from the move. He just helped me out in so many other ways that he didn't charge me for... he was friendly and easy to get ahold of even in the night hours... I will hire him again when I'm ready to update other parts of the house... read more

See all

I called Quantum up to bid on a large project that involved converting an existing storage unit 300 square feet to and Accessory Dwelling Unit in Long Beach. Willie not only responded right away but met me out at the property and submitted a bid within a couple of days. He started right away and got my project done in the timeline we initially agreed to and on time. He dealt with the city inspector start to finish and worked very well independently. I was happy with the project there and also had him remodel both of my bathrooms at my house. I would definitely recommend Willie and team at Quantum for future projects both large and small. read more

See all

Love my new bathroom! Willie and his team were very professional. He arrived promptly and gave me a reasonable quote with itemized tasks the next day. Once I decided to pick them to do my reno they started the same week. His crew were respectful of our time and space - helpful to know their work schedule vs most workers I've dealt with in the past that show up whenever. Willie or his assistant would show up the end of the work day to check on the work done by his crew and do quality control. If I have concerns or would make changes they will address it. I also liked that he would not interfere with my 'design vision.' Some contractors will criticize or complain about your design choices but not this team- they will make it happen! This is just a small project and they are also working with other bigger projects at the same time, but rest assured you get the same attention. Will hire them again on my next project! read more

See all

Highly recommend this company. Very professional and always respond in a timely manner. Great communication, they explained every question I had and reasonable price overall great experience. read more

Willie Griffin, Founder and CEO of Quantum Design and Construction, stepped in as our contractor in a challenging moment when we needed repairs and upgrades to our units prior to selling them. Willie maintained a positive attitude, communicated in a timely manner with us, and was able to get a crew out to begin some major work without delay. As new property managers, we had many questions about different aspects of the job and he responded quickly and patiently from the beginning of the project to the end. We were glad to have Willie working on our behalf. We were all (including the tenants) very pleased with the results. read more

Great working with Willie and crew from Quantum Construction! Their pricing was reasonable and their work was outstanding. I appreciated the fact that Willie communicated with us throughout the project (facelift to the front of our house) and he and his crew were always on time. I wouldn't hesitate recommending Quantum Construction to our family and friends. read more

Willie came for a free estimate to see our bathroom. He was quick and efficient in his quote. A friendly professional that gave an honest estimate. We appreciated him taking the time to talk with us! Thank you Quantum! read more

I used Will and his team for a recent project. They finished ahead of schedule, were reasonably priced, and were very flexible and willing to accommodate my needs. Thanks again, Will. read more

Willie was a pleasure to work with. I requested quotes from 4 contractors to convert a garage door to pre-hung French doors. All four came and checked out the site to prepare an estimate. One was outrageously expensive for no reason, two never got back to me, but Willie got back to me with a reasonable itemized quote and was able to start that week. He stayed in my budget and did everything we agreed. I've had trouble with contractors before, taking way longer than expected to finish a job, leaving trash on site, cheap-looking work, ect. I didn't get any of that from Quantum. I'll definitely be calling on them again. read more

Willie and his crew did an outstanding job on my apartment building roof. The "extras" they performed were unexpected, showing their true professionalism. Willie responded to all of my requests, and gave solid feedback on any questions. The cleanup was superb as well. This is the place to come for any and all construction work. You won't be disappointed! read more

Quantum Construction & Design - General Contractors Near Me - Los Angeles, California

A1 service I contacted several company's and they were the first to respond and tell me they can fix it right away I can't thank them enough for fixing this problem. read more

Quantum Construction & Design - Before - General Contractors Near Me - Los Angeles, California

See all

KS- Lakewood- We needed a rebuild after water damage in the main living room. It was a small job but our insurance company shorted us with the claim payout. My Wife and I were very lucky to find Quantum after the 30 days of hassle with insurance and water remediation process. Willie came out asap and quoted us a fair price. The work was done in 2 days. They actually showed up early and stayed late! They are a dedicated team and have GREAT customer service which is important. These guys pay attention to detail and are very skilled. He was able to match our "old school" baseboards by creating new pieces. This is our 3rd and hopefully last property and we have had bad luck with contractors on a few occasions. Quantum will definitely get our future business and referrals. read more