We hired Joseph to replace an old roof in June 2026. He first came out to explain our options, and inspected the house roof to understand the scope of work and provided a very reasonable estimate a few days later. The work was very timely and his crew made sure everything was cleaned up before leaving. He's very detailed and knowledgeable about roofing standards and can troubleshoot any problem. He even came back out to fix a leak in the patio roof that was done by another roofer. Joseph is very friendly and confident in his work. read more

PLEASE DONT FOLLOW MY MISTAKES I hired Joseph in February 2025 for a full roof replacement. While he initially came across as genuine, personable, and competitively priced, his lack of competence, integrity, and professionalism surfaced almost immediately. In reality, Joseph operates as a solo middleman who subs out the entire job to third-party crews. --- Upcharges & Shady Payment Requests --- The problems started on day one of demo. Even though the roof was only a single layer of shingles, the tear-off took a few extra hours due to adhesive on the substrate--something he had the opportunity to inspect beforehand. Rather than owning field conditions, he dumped the extra cost on me. When I tried to meet him halfway and split the difference, he threw a fit and refused. On top of that, he pleaded with me to pay his demo sub directly in cash to "help him out." In hindsight, having the homeowner pay his sub directly was a massive red flag regarding his cash flow and business practices. --- Fighting the Contract & Playing the Martyr --- Joseph fought me on clear terms throughout the build and resented basic accountability: Fascia Boards: The contract explicitly stated replacement fascia boards would be primed, but he pushed back with heavy resistance and grumbling when asked to do it. Quality Control: When his crew installed a visibly cracked fascia board, asking him to replace it was treated like an impossible chore. Basic Code Compliance as "Favors": Whenever he was caught missing something standard--like the low pitch of my roof actually requiring two layers of underlayment felt instead of one by code--he acted like fixing his own oversight was doing me the biggest personal favor in the world. Ego Over Accountability: Any time I held him to the contract or questioned his workmanship, his go-to condescending response was: "Are you the roofer or am I the roofer? Who has 30 years of roofing experience?" --- Scare Tactics to Dodge Inspections --- For an attached carport flat roof replacement, he used scare tactics to talk me out of calling for a final city inspection. He claimed the carport might not be permitted and warned it could lead to fines or being forced to tear it down--an obvious attempt to prevent an inspector from checking his work. --- Leaks, Excuses, & Cut Corners --- The ULTIMATE failure was that the brand-new roof leaked around a replaced skylight, damaging the drywall on my ceiling. Dealing with him on warranty repairs was a nightmare: Laughable Excuses: Instead of properly inspecting the flashing, he made absurd claims like "dirt and dust can make a roof leak", blamed mystery people walking on the roof and the directional wind of recent rain events. (laughing out loud as I write this) Band-Aid "Fixes": He insisted the installation was fine and tried to just smear a bead of caulk on top of the shingles. Anyone knows exposed surface caulk is a lazy band-aid, not a watertight repair the solves the underlying issues of a poor install. Evading Responsibility: He actually tried to bargain his way out of repairs, asking: "If I fix the skylight, will you take care of the drywall damage inside?" Shorting Materials: After I refused his surface caulk fix, he finally brought a roofer back out to pull up the shingles and fix the flashing underneath. Talking directly with the crew made it clear what happened: Joseph had shorted them on materials from the start to pad his own profits. --- WARNING --- Do not fall for the friendly sales pitch or the low bid (not that he was a screaming deal). Working with Joseph was an emotional rollercoaster and brought nothing but ongoing stress for me, my wife, and young children. Joseph brought constant pushback on contract terms, cut corners on scope, treated basic compliance like charity, and took zero ownership when his work failed. Find a legitimate, professional roofer instead. I've attached photos as proof of some (not all) of our unfortunate dealings read more

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Joseph came to my home on a Sunday and repaired a leaky skylight for only a third of the cost that all the other companies wanted to charge me. He was also the only one (out of 14 places I called) who was willing to provide a ballpark estimate over the phone based on the pictures. Not only that, he provides a 1 year warranty for his work and took the time to explain my roofing problem thoroughly, including showing me video of my roof. Don't go with other companies that overcharge by 300%. Go directly to Joseph who will respond right away, get the job done well because he is doing it himself instead of paying middle men to do the work. And to top it off, he's professional and pleasant to work with. read more

De Lorenzo's Guaranteed Roofing - Skylight leak. - Roofing Near Me - Glendora, California

Joseph was great! Was quick to respond. He came by was honest about the problem and gave a great price...he fixed my leak the next day! Give him a call for your roofing needs! read more

Joseph and his team did a great job in replacing the roof on my mom's home. It was a pleasure to work with him. He was on site and walked me through the whole process of the job. I highly recommend the company. read more

Trying to contact De Lorenzos with no reply. Called the number that is listed here and left 2 messages. Did the "Request a quote" through Yelp. Somebody please respond. Since I am in Montebello I would like to give a local business a chance. I'll give 3 stars or it won't let me post. read more

I recommend DeLorenzo's for all your roofing needs. I am pretty detailed oriented and things being in order are very important to me. My roof was over 30 years old and although I had no leaks, I knew it was time to replace it. I received a few different quotes for the job and had a decision to make. Joseph's quote was the most detailed in terms of work to be done and expectations. It was not the lowest bid and was not the highest. It was a great quote given the detailed breakdown and I decided to go with DeLorenzo's. Joseph communicated very well with each step of the way from beginning to end. He was present throughout the whole process from tear off to the final sealing of materials. My wife and I are very happy with the final product because it was done professionally and looks great. Don't hesitate to hire this company for repairs or roof replacement. The experience and detail needed for this type of work is something this company does have. read more

De Lorenzo's Guaranteed Roofing - Front of Roof - Roofing Near Me - Glendora, California

Thank you DeLorenzo, my warehouse leak is finally fixed after 3 other roofers trying to repair. You are correct on the problem. I am sold by what I see this morning after the storm of the century "Hilary". I was worried all night about the new roof that you did 2 months ago. You are very experienced, honest and professional. I would have saved myself a lot of money and headaches if I knew of you early. Thank goodness it's not too late. I will definitely call you again for my house. Lorenzo roofing is #1. read more

Joe is great. Fast and fearless. Took care of the roof repair properly. Did not quote and switch on pricing. Joe is rare. He cares! Thank you Joe. read more

Joey was not the highest nor the lowest bid of the 10 or so I got. My roof had some challenges that were worst than we expected and Joey let my contractor get them up to code while it delayed his crew. Joey was onsite everyday to resolve any issues that came up. Joey was the only contractor that recommended torch down on the low slope of the roof. He was very straight forward and ran a well tuned crew that needed little direction. The attention to every detail was very refreshing and I am thankful for a job well done in a short time. Inspection passed the first time out. De Lorenzo's roofing will always be my first and only recommendation to anyone asking for a roof estimate. read more

De Lorenzo's Guaranteed Roofing - new roof with vents installed - Roofing Near Me - Glendora, California

This review is way overdue but Joseph came through during the rainy winter months when I needed help with a roof leak. I called a couple roofers and found Joseph to be the most honest and straightforward of the bunch. He told me exactly what would work, what wouldn't, and how to save money based on the current age and life of my roof. He quoted a fair price. Understanding the urgency from the leak, he squeezed in the project so we wouldn't have to live with a leak causing more damage. The work was done beautifully and efficiently and we have Joseph to thank for that. I highly recommend De Lorenzo's Roofing and will absolutely call him again in the future. read more

Purchased a home and with the inspection we needed a new roof. Shopped around and got several quotes and tried to educate myself on roofing. After he checked out my roof as part of the free estimate, my experience with Joseph is that he was very honest, straight-forward, and detailed with the different options we had. I felt very comfortable working with him. Turns out he also had the best price. His roofers are amazing and did an awesome job. Joseph also provided us with the heavy duty "cool roof" shingles, and my wife and I notice a big difference now especially during all this hot weather. The roof passed inspection with the city and we are very pleased. read more

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Joseph, the owner, was very knowledgeable and easy to work with as well as his foreman Saul and his crew. We had cracked tiles replaced and a small leak repaired near the valley drainage area, as well as widening the drainage valley to prevent further clogs and leaks. Joseph estimate was very reasonable compared to the other estimates we received. He also was able give us a day within a week to do the repair which was the fastest of all our quotes. He also made the extra effort to try to match our tile since the manufacturer went out of business. When his foreman Saul arrived with his crew they were very accommodating and willing to work with us to my husband's satisfaction. The job was done quickly and they did a great job! They even cleaned up the job site when they finished. Thank you! read more

We contacted Joseph for a proposal based on the great reviews seen on Yelp! I got 3 proposal. Our home needed a complete roof replacement. Of the 3 proposal received De Lorenzo's proposal was the lowest. Working with Joseph was great. Very honest, knowledgable and prompt with every step of the job. He provided reference and all credential were in standing order. His crew was cordial, respectful and all area was left very clean at the end of their shift. I highly recommend DeLorenzo's services ! read more

Joe and his team did a great job installing our new shingle roof. The crew was clean, professional, and they work fast. Our roof was in terrible condition, we had one of those wood shaker roofs. So our house needed all new plywood and new shingles on a two story house. This was a big job but they were able to get the job done. We are completely satisfied with the results. Customer service: As a first time customer, Joe took the time to explain how his company works, what to expect when the job starts and when it is done. He took the time to go through the contract with me to make sure that everything was clear to me before he started the job. He was there when I called with questions every single time. So in terms of customer service he delivers. Price: De Lorenzo roofing provided me with an honest and clear quote for the job. I had entertained a few other bids where the square footage was wrong, which means I would have been overcharged. Other bids wanted to upswell me with product with a weak warranty. Not Joe, he measured my roof several times to ensure we got the square footage correct. Like I said, the quote was honest and clear. I received the lowest bid from Joe and his team. I'm so glad I went with Joe because other companies were not being honest with me. Quality: De Lorenzo roofing did a fantastic job. They made sure everything was up to code. They replaced several planks of wood that were damaged and they took the time to explain why they needed to do it. They went above and beyond in making sure everything was done correctly from the plywood to the shingles, and the flashings. They even made sure to seal the area where the fireplace meets the roof with extra protection to avoid water damage. They were efficient, they moved quick and the job was well done. This was real professional work. read more

Joseph De Lorenzo's Guaranteed Roofing is one of the best contractors I have ever dealt with! Joseph is by far one of the most honest, reliable and straightforward people I have ever met! He's pretty funny too! Joseph's crew was amazing...only the best quality of work and workers for this company. I had a huge satellite dish on my roof that I had wanted taken off years ago. Joseph's crew was nice enough to remove it for me. I hardly knew that my roof was being replaced...the workers were so clean and left no mess at the end of the day! Thanks Joseph for a beautiful job! read more

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Joseph just completed a new roof for my 60's era home...needed to remove previous roof and plywood to do the job right. He was careful to assess the condition and astute in planning out the best way to correct the problems. He even did some troubleshooting to pinpoint the cause of a long persistent patio leak, and took steps to clear the path for rainwater. I feel secure and snug should El Niño visit this winter! Estimate was budget friendly and work done timely! Cleanup exceptionally thorough! read more

De Lorenzo's Guaranteed Roofing - Work in progress - Roofing Near Me - Glendora, California

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I asked Joe De Lorenzo to install a roof vent for a bathroom fan. Although I had already purchased a roof vent kit from a local home improvement big box store, Joe suggested that I should return the kit and he would install a different type of vent with a much wider flange and a rounder profile. He quickly installed his recommended vent and applied a fresh coat of paint to all other vents on my roof. As it turned out, I later learned from further research that Joe's suggestion was the right one. The vent kits from the big box store, due to their narrower flanges and squared shapes had more problems with deterioration and leakage. Joe did a good job at a fair price and installed the right vent. I was very happy with his work. read more

Extremely helpful, professional and informative. This is an honest company. I highly recommend working with De Lorenzo for roofing needs

Had a great experience, did a magnificent job. Super clean and organized. I recommend him to everyone. read more

De Lorenzo's Guaranteed Roofing - Our new roof! - Roofing Near Me - Glendora, California

IF you are looking for an HONEST ROOFER Joseph is your guy! I needed a project done urgently and he was busy with a couple projects... But he took the time to talk to me on the phone with detailed description of what I should have done. Very PROFESSIONAL and thorough! THANK YOU JOSEPH! read more

New roof installed, Joseph and his crew did a great job. Very happy with the work they did.

Joseph was very professional, knowledgeable and honest. Our condo had bad leaks during the last rain storm. I found Joseph on Yelp and scheduled a free estimate. It was raining on that day. He showed up on time, put on his raincoat, climbed up on a tall ladder and checked out the roof. He showed us pictures of the roof and took time to answer all our questions. We really appreciated his patience and professionalism. He explained to us what happened to the roof, how he planned to repair and what the project timeline would be. He also gave us recommendations how we should maintain the roof in the future. Great customer service. Looking forward to working with him soon. read more

Great quality work. Work was done quick and efficiently. Did an excellent job all together, very pleased.

Our roof was replaced about 6 years ago by a well regarded company in the San Gabriel area. Shortly after, when the rainy season began it became apparent that there was a leak where the room addition attached to the house. Since we were still under warranty, they came out and repaired it. All was well for years as the drought really didn't allow for a good test. The few small showers this past December revealed that the leak was still there. Interestingly, the roofing company was no longer in business so I called around. With El Nino rains coming soon I found that all the roofing companies were booked for the next 3 months. I called De Lorenzo's and was leaving a VM when Joseph picked up after hearing that my request was for a leak repair. Joseph explained that his roofing crew is busy as all the other roofing companies but as the owner with 30 years of experience, he personally specializes in roof leaks. So he had no problem coming over within a few days with all his leak repair gear and got the job done right. He claims that he has a knack for repairing leaks and I can now attest to his ability as heavy rains have just tested the roof about 4 weeks after his repair. He wasn't cheap but he did patch about 10 spots that were suspect and spent about 4 hours total from arriving until departure. The wife griped about the price initially but complimented how good the repair was after the heavy rains. Joseph is the man when it comes to roof leaks. I almost forgot, Joseph guarantees his leak repair for 1 year which is not typical according to him. read more

I am posting on behalf of Unity of Pasadena (church). We had been experiencing leaks for several years. It wasn't until we found De Lorezno's roofing that we got an honest assessment of the problem. He helped us fix that first and then he helped us identify the correct product for our roof. Joe's quote was competitive and they did the job when they said they would. We are happy. read more

Mr. Delorenzo fixed my leaky roof last year and was very thorough in his inspection and completion of the work. When I had another leak in a different area, that I thought might be related to the initial leak, he came out right away and fixed it, even after he discovered it was a different leak. I highly recommend him and even recommended him to my parents. read more

Have used DeLorenzo's for years. They do a great job. Very efficient and excellent service. I highly recommend them.

Joseph (the owner) installed new roof for me a week ago and the inspection passed with no issues. He is honest, professional and the communication is smooth, the quality of work is great and his pricing is competitive. I highly recommend his company to anybody who needs any work on roof. read more

We chose De Lorenzo's Guaranteed Roofing as he was recommended by a colleague who had his roof replaced. With everything we read and see on television, we are very apprehensive in any contractors' work. Joseph (the owner) gave us an honest estimate which spelled out additional costs if needed and was easy to read. He and his crew came out and replaced the roof and damaged 1X6 wood and fascia board. In spite of finding damaged wood and rebuilding a skylight they had our new roof on in just a couple of days. Joseph is a stickler for quality and safety something you don't see in contractors these days. He took the time out of his busy schedule to come back and ensure that solar panels we had removed and reinstalled were done correctly without damage to the new roof. He went above and beyond what we expected. We highly recommend you contact him for your roofing needs. Also, why YELP put me as living in San Francisco is beyond me. I live in Montebello, CA. read more

Joe De Lorenzo's roofing is a prompt, honest and professional company. He came to my house to give an estimate and after reviewing the situation gave me an honest and forthright quote. I had contacted another roofing company which had done work on my roof previously bu they never showed up even after making an appointment. Joe gave me a start date and was even earlier since his previous job was finished. He and his crew came, started and the job was done with quality material and professional competence. Cleaned up and left without disturbing anything. I would recommend Joe De Lorenzo to my family and friends. read more

FIVE STARS and well worth it, great price and quick work, they put a New roof on my moms house, she couldn't be happier. We highly recommend this company. read more

Needed some repairs on two flat roof carports. Had Joey inspect both structures. One needed some waterproofing and the other required extensive repairs to the structure. Removed and replaced rotted studs and joists and restored the the structural integrity. Then applied the new roof. New storage cabinets were built to replace the original ones. He always discussed every detail of the project beforehand. The work exceeded my expectations, the cost was very reasonably and done expeditiously. For all your roofing projects call De Lorenzo's Guaranteed Roofing. read more

So... this may have been 5 stars but we always hope for more. Joey DeLorenzo is a high quality roofer. He is straight forward, honest, hard-working and delivers quality results. I previously had him personally do a garage drain. Now, I have had him do my house (flat) roof. I have no complaints and know the roof was done very well. I would have loved a longer guarantee and a less expensive price (the wood replacement costs caught me a little off-guard but Joey was clear from the start that he couldn't say how much that part would be until he could see the wood, itself) but overall I'm glad I chose him over someone who's work I didn't know. read more

I am completely satisfied with De Lorenzo's Guaranteed Roofing. I received 3 estimates for work on my roof. They all said I needed a new roof and the cost would be between $10K - $11K. I wasn't expecting the cost to be so high. When De Lorenzo's came out for an estimate to my surprise Mr. De Lorenzo said I did not need a new roof and the life expectancy of my current roof was easily 15 years. He did recommend to replace all the ridge caps. He also informed me that the manufacturer of the current caps went bankrupt because of product failure. DGR replaced all the caps at a cost of $1,200. Mr. De Lorenzo was the only honest company to actually tell me what was really needed and saved me thousands of dollars. I can appreciate the honesty and integrity of Mr. De Lorenzo and his company. I would gladly refer them to family and friends. read more

If I could give more then 5 stars, I would. Customer service is great!! Fast and great work!! Very honest. They made sure no mess was left behind, unlike other company's out there. We will be hiring them to do the whole roof soon!! Thank you so much!! read more

I'm writing this on behalf a family member who had their roof redone by Joe. Joe was very professional from the start. He gave a lot of ideas and suggestions to vent the attic, which got very hot. When the roof was removed there were a few issues, but Joe worked with us and and we were able to get things fixed. All said and done everything came out great. Thanks! read more

Waited a year (and through our mini El Niño) to write a review of our new roof. It has performed perfectly. Joe's was the lowest bid and best warranty of three bids we got to replace our leaking 24-year-old tar and gravel roof. The job began and ended on schedule, clean up was impeccable, and Joe and his crew a delight to deal with. Highest recommendation. read more

Joe De Lorenzo and his crew did excellent work. Joe gave me an honest estimate and beat out all the bids. He even lent me his ladder. The roof looks great. Overall I would definitely recommend Joe and his crew. read more