Dennis is very punctual and very easy to work with. Great communication, always very responsive to…read moreemail and phone calls and keeping us up to date with the project. He installed 30 beautiful Harvey windows in 3 days. I will definitely recommend his service to friends and family.

Dennis replaced our old shutters and we couldn't be happier with the job! Our house looks so much…read morebetter. I had gotten a bunch of quotes he was very competitive, super prompt, and kept us in the loop through the entire process (removing the old ones, ordering and installing the new). We would absolutely use DPG again in the future! Quality work & happy to support a local business!

The response time for emails / messages was super quick and if they could not get back with full…read moreanswer there and then , they would still message to say they would be in touch later . As my issue was window replacement , after they had looked at it , due to the type & size the estimated price had to increase but they still gave me a good price and would have fixed the sash for me to reduce the price except it had been thrown out . The window had to be ordered & they were in touch with updates along the way which is very important as I'd never used them before and had paid 50% deposit . They were very very professional & polite & easy to have there doing the work when the work was being done .

Juan did a great job installing a door with new framing and new locks, etc,. He fixed a few things…read moresomeone else had installed that weren't level and did a few other minor handyman type services and I couldn't be happier with the results. He pays attention to detail and was very responsive and dependable. I will use him again for my next project!

I had O'Sullivan Installs put siding on my house almost 3 years ago. Shortly after install a few…read morepieces began to warp. I contacted Tim (owner) to report the issue. He told me he would send someone out to match the prices to replace the warped pieces. The exact lot cannot be matched and Tim told me that it would be a warranty issue with the manufacturer. He told me this about a year ago! It is ridiculous! Tim is hoping I forget about this while keeping my money and not standing by his promise. I would not recommend using this company.

I have hired O'Sullivan to replace 10 windows in my home and re-side the entire house. Siding work…read morehas not yet started but last week the windows were done and I just had to write a review on the spectacular work O'Sullivan has done. Everyone I have worked with so far--Brian, Melissa and Tim--have provided outstanding service and support. The windows look incredible. I thought I was going to miss my old wood (super inefficient) windows and that vinyl was somehow going to look cheap but it couldn't be further from the truth. From a windows perspective, they only use quality products. The windows look incredible from both the inside and outside, and our giant picture window is a statement piece in our living room. I especially want to make a shout out to the window install crew, Vlad and his team. They were super professional, arrived and were done on time, and best of all, I can honestly say the house was as clean, if not cleaner than I had left it. Both my husband and I were expecting to come home to a construction site and that could not be further from the truth. Thanks guys! Can't wait for my new siding!

Simply put, they do amazing work. They have fixed windows, bathroom glass doors, and have been…read moreextremely helpful in referring me to other organizations.

I had two companies give me a price quote and Banner Glass/Shelmar was BY FAR the most reasonable…read more They explained they did not require a "lift" to remove and replace a very large glass window. They could simply use a ladder. This was the reason for the price difference. They came on time, they were courteous, professional and did excellent work. I appreciate their honesty and quality of service.

The response was very quick. Made my appointment with the owner. The owner's son did the estimate…read moreand measurements. No hard sell; just "this is what you need, this is what we got, this is the price." No nonsense. No pressure. The install team works for the company, not a sub-contractor. No multiple levels to wade through. That was a selling point for me. The team was fast, efficient, and friendly. The job looks great. Super happy with the outcome. Very highly recommend

The Fisher Window crew,Polo and Wilken just finished installing 11 windows in my home. They were…read morevery friendly and did a fantastic job, and a cleaned up as if it were their own home. Thank you Jeff, Ricky, and Kevin. BRAVO!!! Jerry A

Rob did extensive work for us in 2011 and is doing more now. His previous work included blow-in…read moreinsulation for exterior walls of our big old historic registry home, and installing new doors + insulation w/ vapor barrier in a new basement-level storage room. Both the work & service were terrific (we especially appreciated his helping us navigate the complex Mass Save reimbursement process). We invited Mass Save back recently (for windows), and the inspector said he'd never before recommended "no insulation upgrades" for an old house, but he did for ours since Rob's 15-year old upgrades were so impeccable! Moreover, the inspector actually asked to photograph the tricky basement area to use as exemplar of an ideal installation. Finally, this is just icing on the cake, but you couldn't find a nicer, smarter, more conscientious & honest guy to have around the house.

Rob and his crew were amazing in every possible way. They took the time to understand what I was…read moretrying to accomplish beyond replacing my windows and doors, and the final product shows. The work they did was impeccable, and they were very thoughtful, considerate and professional throughout. I can't say enough good things about them and the work they do. I look forward to working with them again in the future, and I would recommend hiring Rob and his crew without reservation.

We had a screen break on a set of older, but not out of date windows. The woman who answered the…read morephone talked me through the challenge I was facing and offered up recommendations on how to fix. She didn't need to do this, or spend time with me trouble shooting...but she did. If I ever have business to do in the future they are at the top of my list!

I want to echo another reviewer's experience - we have 2 windows that wouldn't stay open and we had…read moreassumed the only option was to replace them. I called and Berge picked up, he explained that they don't do window repairs but if I were in front of the windows he could walk me through how to identify the problem, possibly fix it myself or find a handyman to fix it. When I got in front of the windows he talked me through how to take the windows out of the track, identified that the "shoe" wasn't attached and that's why they won't stay open. After I got off the phone with him, I followed his instructions to get the shoe unstuck from the bottom of the track and managed to get them reattached to the windows, and now they both stay open! So incredibly helpful! If we needed to replace those windows we would definitely have gone back to Berge for it.

You ever have a basement window just....sporadically shatter for no apparent reason? Well,…read moreevidently this is just a thing that randomly occurs in this part of town. The last time I had glass shatter spontaneously was back in '24 when our winter storm door screen was completely pulverized by the summer heat, it seems (Pro-life tip: swap out your storm door screens in the summer with mesh ones). On the back of that unforeseen devastation, out went my mass inquiries to all the local shops servicing the Nashua area. Out of maybe 5 (?), 3 responded almost instantly. One sent a quote so high, I was half tempted to reply and ask if I could have some of whatever they were smoking. Another replied with what seemed to be a promising rate, but there was one problem. Their communication was severely intermittent to the point where they inexplicably ghosted me faster than a recruiter responding to a job applicant. Ultimately, I settled on Good Window Works. They offered a fair quote, were easy to get ahold of, and even provided a COI statement as per the request of our housing board. For those unaware, a COI is a Certificate of Insurance. Basically, it's assurance to the board that the contractor in question is insured to complete the job without creating a liability if they, say....jam their thumb beneath a tack hammer or something. With those formalities out of the way, the job was simple enough: Replace the half of the basement window that abruptly disintegrated. All in all, the job took roughly 2 hours. In the end, the window he installed was so transparent, it looked like there was no pane at all in the frame. But no--the glass was just THAT pristine! I don't say this often, but....experiences like these are what I love most about being a Yelp writer. So rarely do I get to be in the position to not only promote another hard working local business, but also pose as the microcosmic advertising vehicle that just might serve as the prompt some very fortunate individual needs to go, "Yeah, I'm hiring this place to work on my house". If you're wondering whether you should hire these guys for your next installation or repair job, the answer is likely yes. Good Window Works is worth 5 window panes clearer than thin air out of 5.

I had a window with a broken pane on the third floor attic. I called several places, including one…read moreI've used for years for glass and screen repair. Only Good Windows responded and sent someone out to do an estimate. They just finished the job. The original estimate was done from the ground, however when the technician was able to get the unit out of the frame, (This is an old style window), we both saw that additional work had to be done. The tech did the work and did an excellent job. It was only a bit more over the original estimate, but quite reasonable. I highly recommend Good Window Works.