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Top-Rated Insulation install or upgrade pros in Alexandria - Updated Nov 2026

Avatar for Prudent Homes
Prudent Homes
4.7(
238
)
Insulation - Install or Upgrade

Serving Alexandria, VA and surrounding areas

Approved

In business since 2002

Free estimates

Warranties offered

"Following discovery and repair of a roof leak, I needed to have my existing attic insulation removed, and new insulation installed. I received several quotes, and decided to choose Prudent based on David's timely and professional communications, honest appraisal of what the job would entail, and competitive pricing. David and his team did an excellent job throughout the process. They arrived on time, used drop cloths and plastic covers to keep everything clean, walked me through the process and progress, and shared pictures of areas I couldn't easily see or get to myself. At the end of the job, they thoroughly cleaned up all debris and left the house and property as they had found it. We discovered a minor issue later that evening, and David sent a member of the team out to fix it the next day. Excellent communication and work - very happy with the end result, and would hire again in a heartbeat."
28 neighbors recently requested a quote
Recommended by94%of homeowners
Avatar for DMV Insulation
DMV Insulation
5.0(
6
)
Insulation - Install or Upgrade

Serving Alexandria, VA and surrounding areas

Approved

In business since 2023

Free estimates

Warranties offered

"DMV Insulations is a great company to work with. The company focuses on your personal needs, always on time, and great customer service! Mark was able to answer any questions I had, and provided me with useful information. I would recommend this company to anyone with attic insulation needs."
Fiberglass Blow-in
Sanctuary insulation install.
Save energy, reduce waste, and lower your carbon footprint.
Loose fill insulation install.
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+5

Response time1 day
Response rate100%
7 neighbors recently requested a quote
Avatar for Discount Energy Services
Discount Energy Services
4.3(
89
)
Insulation - Install or Upgrade

Serving Alexandria, VA and surrounding areas

Approved

In business since 1984

Free estimates

Warranties offered

"After my call to Discount Energy Services, I knew who was coming and when to evaluate my attic insulation. The estimate was prepared on-site with pricing. The workers arrived and knew exactly what they were to accomplish, which they confirmed with me. They prepared the entire path with clean drop cloths and created a plastic drape around my attic stairs. The foreman was glad to explain any aspect of the procedure. My attic was upgraded to R-49 and the difference is notable."
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+2

Response time7 hrs
Response rate100%
22 neighbors recently requested a quote
Avatar for Comfenergy, LLC
Comfenergy, LLC
4.6(
54
)
Insulation - Install or Upgrade

Serving Alexandria, VA and surrounding areas

Approved

In business since 2011

Free estimates

Warranties offered

"The crew that originally came out were very efficient and friendly. They finished almost everything in the time that was stated. The only thing with them that I was concerned with was that they keep asking me what they were supposed to be doing. They knew that they were supposed to doing insulation but didn't have the details. And when i told them that I would have to go back to my paperwork they said that they would call the project manager. On the 3rd day they needed to do one last thing to an outer wall but couldn't do it because it was too cold and they were concerned that if they tried to remove the siding it would crack. They left on a Wednesday telling me that someone would contact me to come back on Saturday to finish the job. Fast forward to Friday, I get a few missed calls and then text messages saying that they had a crew in the area that wanted to come by in 30 mins. I wasn't home but finished up what I was doing to meet them at my house. When they get there they don't even know what the job is that they are supposed to be doing and don't have a ladder tall enough to reach the area. So they decided that they could do the job from the inside and said that they would need to drill a couple holes in my closets to fill the wall with insulation. They were very admit that that the holes would be repaired and the drywall fixed and painted and that someone in the company would call me and a crew would come out to do the drywall repair. So they do their part and leave. After they leave I realize that they put 6 holes in my wall. Not what i was expected but they did a decent job on plugging the hole back up with the piece of drywall that they removed. I waited for someone to call me about fixing the drywall but they didn't call. So after a week of waiting I called the company to ask about it and the mold remediation issue I was having (more on that in a sec). They seemed unaware on the drywall needing to be fixed and said they would send someone out to look at both things. A few days later someone comes out. They were unaware of the drywall repair but were there to look at the mold issue. Now about the mold issue. I will get back to the drywall in a min. So I paid for them to spray something on a strip of mold that we had in our basement and was told that after it has been sprayed that it would like nothing was ever there. Well after them spraying it twice it still looked awful. The wood looked but as black as before they came. So when these guys came to look at it they said that there was definitely no mold there. the problem was with my wood. So much for it looking like nothing was there. Now i have to hire someone else to sandblast it or something. So after these guys looked at the basement they said that they would look at the drywall. They look at it and are like "oh, i don't think we have the materials on our truck to fix this but I will take a look". They did have the materials and would tape it and mud it but weren't really experienced in drywall repairs but they knew enough to do the job. I should have stopped them right there but I thought it would be okay. Well once the mud dried I could tell what an awful job they had done. I will have to either try to fix it myself or hire someone to do it. And I probably should have called them back again but I am really tired of them sending me people that don't know what the job is before they get to my house and are not prepared. Only getting a C because the first crew was decent."
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+68

Response time1 day
Response rate100%
42 neighbors recently requested a quote
Avatar for ROI Construction LLC
ROI Construction LLC
4.1(
18
)
Insulation - Install or Upgrade

Serving Alexandria, VA and surrounding areas

Approved

In business since 1974

Free estimates

Warranties offered

"We had a great experience with ROI Construction sales representative David Burke. David was very knowledgeable about ROI's porducts and services. We look forward to getting our attic insulation project completed and will provide a more thorough review at that time. Thanks, Tim"
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+19

60 neighbors recently requested a quote
Recommended by90%of homeowners
Avatar for Kelvins insulation
Kelvins insulation
5.0(
9
)
Insulation - Install or Upgrade

Serving Alexandria, VA and surrounding areas

In business since 2016

Free estimates

Credit card accepted

"This guy called promptly to schedule an in home consultation and came promptly the next morning. I received a courtesy call from him saying that he was running 10 minutes behind schedule. When he got here, he was friendly, he evaluated my attic and determined that no insulation was needed. I tried to push him a little to say that we might need a little more insulation up there since that particular room gets colder than others but he insisted that adding insulation wouldn't help. I think others might have tried to get some work out of the visit, but not these guys. I would recommend them based on their honesty, fairness, and integrity."
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+15

Recommended by100%of homeowners
Avatar for Positive Energy Construction Co.
Positive Energy Construction Co.
4.6(
48
)
Insulation - Install or Upgrade

Serving Alexandria, VA and surrounding areas

In business since 2011

Credit card accepted

"No deficiencies of consequence but I had to pay attention as work progressed; supervision of laborers sometimes insufficient.  Obviously proficient at insulation work; not facile with other aspects of the job.
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The Before
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Attic Air Sealing
Recommended by95%of homeowners
American Home Contractors Inc
4.7(
2,134
)
Insulation - Install or Upgrade

Serving Alexandria, VA and surrounding areas

In business since 1986

Free estimates

Emergency services offered

"It was an absolute pleasure working with everyone at American Home Contractors (AHC). I had a very customized project requiring a very specific type of siding since I live in Georgetown, DC, and we have several layers of historic oversight required prior to permit issuance. In other words, this neighborhood is extremely difficult to work in due to all the regulations required to obtain a legal permit to do any external work on these historic homes. John Roda, AHC’s Project Coordinator, was my primary contact at AHC over the many months it took me to finally obtain my permit and begin deciding on how to obtain the siding necessary to meet permit specifications. He was extremely competent and patient throughout the entire process and worked closely with me and the Historic Preservation Office contact for Georgetown to ensure that we were meeting strict product demands while also staying within my budget. So many other companies either refused to work with me or were incapable of working with me on this project due to the difficulties I encountered while navigating the permitting process alone. AHC is different. They have stamina, courage, and endurance. High-quality people + high-quality materials= high-quality job with the added bonus of a decent price for what you are getting. In the end, my home looks absolutely stunning. Even more importantly, I now have the peace of mind that my home has good quality siding and is structurally sound. AHC actually had to remove the illegal Masonite siding (has a class-action lawsuit for the damage it has caused homes in the past) that was likely installed in ~1970-1980 without the issuance of a legal permit when the old pebble dash stucco was removed. They installed some beautiful cedar siding in its place. I spent many sleepless nights worrying about the damage the Masonite might have done to the furring strips and the old 1880s substrate in the lead-up to the installation. Thankfully, all was well and the installation was extremely efficient and successful. The AHC siding installers arrived at 7 am on the day of installation and worked tirelessly until 7 pm. We initially estimated the job would take ~ three days, and they finished in only a day. Their work ethic and workmanship on the installation were truly astounding, especially in an era when simple tasks are often drawn out and good work ethic and professionalism are touted ad nauseam by companies but rarely mobilized in practice. As a first time homeowner, I have gone through a lot of mental anguish with my home’s historic idiosyncrasies, particularly when I am in the process of gathering estimates for necessary maintenance work and wait weeks or even months to hear back from companies that overcharge for low-quality materials and unenthusiastic, inefficient labor. AHC is different. I heard back with my first estimate within days (during fall 2020 with the COVID pandemic raging on), the materials were excellent, the price was fair, and John was very enthusiastic and optimistic throughout the project’s duration even despite the multiplicity of hurdles we encountered with the ever-changing demands of the historic preservation specialists. The only upside of gathering competing estimates and meeting with all those contractors I met with initially is that when I finally found a gold standard contractor (AHC), I experienced the sheer relief of having a reliable contractor for my current and future projects and to wholeheartedly recommend to friends and family. I am so grateful to everyone at AHC who worked so hard to make what really seemed impossible and out-of-reach finally materialize. If you have a tough (or simple) project that you need to be done right and are torn between companies or are just starting your search for a reliable, five-star contractor, I can highly, highly recommend AHC based on my experience with them. You will not be disappointed."
Tesla Solar Roof - Elkridge, MD
Tesla Solar Roof - Fulton, MD
Tesla Solar Roof - Ellicott City, MD
Tesla Solar Roof - Washington, DC
GAF Decotech – Westminster, MD

+509

Recommended by95%of homeowners
Cameron Home Insulation
4.6(
40
)
Insulation - Install or Upgrade

Serving Alexandria, VA and surrounding areas

In business since 1907

Free estimates

Credit card accepted

"Debbie, the AC&R salesperson, was very knowledgeable and confident. They were the 2nd quote I got for work and came in even lower than I expected (which gave me pause as a low bid is a red flag). But true to her word, they did the work professionally (mostly...see below) and promptly. While I had another company do the energy audit for the Pepco rebate, AC&R took over the work, did the blown fiberglass one day and the spray foam the next.



For the blown fiberglass in the attics above our additions, they added spray foam (from a can) around any gaps per the contract and foam board baffles at the soffits. The installer noted that all our soffits were blocked and the batting insulation was too wide for the rafter channels, so he leveled it out as best he could to ensure an even coating of blown insulation. At the end, he sealed up the gaps between the attic and our to-be-finished upstairs (cape cod style, so all one room).



For the spray foam insulation, the team came in the next day, and I had to be out of the house due to fumes. I did come back around noon as they expected to be done well before then. They didn't know I came in and I went to the back of the house to watch TV on my work break. The one annoyance was during their cleanup, one of the installers came down into our kitchen and then saw me. He said he was looking for a vacuum cleaner to clean the stairs. I told him don't worry about the carpet as it was getting pulled up, but this was the one piece of unprofessionalism I noted above. Contractors should NEVER use the homeowner's property; they should bring their own tools, including vacuums!



While the spray foam can get very messy, they kept the splatter mostly contained to inside the crawlspace, not the finished flooring. However, I was surprised that they didn't tape off the outlet covers or light switched. since the particles are so small, we're going to have to replace the switches/receptacles at our cost. Also, there was a storm door screen that wasn't covered and now needs cleaned. Basically, I think they should have taken more care in covering the very few items we left upstairs and the outlets/switches.



They didn't spray around the window frames (large gaps where window weights used to be) because the open cell foam would expand too much. If I wasn't there, I think they would have just left, but it was clear in our contract discussions they needed to insulate those spaces too. They used a few cans of "Good Stuff" equivalent, but didn't fill in the gaps entirely. It did the job well enough, but it's a ding against them as I expected more preparation.



Lastly, I thought that AC&R would walk me through all the scheduling and final "test out" (for the Pepco rebate), but I had to contact them and schedule with someone different each time. They were always prompt, but I expect the experts to know to do this for/with me rather than expect me to know the process. I go through it once in a lifetime while they do it weekly.



While the end of the review sounds more negative than positive, I would definitely recommend AC&R out to others as they're priced right, they have been in business for over a century, and like any contractor, you just need to follow up to be sure everything is done to your satisfaction.
"
Recommended by100%of homeowners
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