Aspen Home Improvements
“I purchased a new patio door and I feel like I now have a luxury door lol It glides so smoothly and was installed quickly and efficiently.”
Best Insulation Contractors in Lancaster, PA
15 contractors listed · 7 in Lancaster · 2 open 24/7 · 4 open weekends · all 15 rated 4.5+
Data verified November 2, 2026
The Exterior Company
“He helped me navigate an insurance claim and was available throughout the process of installing a new roof.”
Klausmair Construction
“When I reached out to inquire about getting the siding fixed, Evan responded quickly and came the very next day to fix it.”
KC Green Energy
“Things could not have been more simple from the 72 panel 440 watt solar drawings and presentation , to the courteous / professional installers.”
Armor Roofing and Renovations
“Stacy is great with communication and Dan and his team did an awesome job and were very transparent with what they were doing.”
Lancaster Roofing Company LLC
“Good quality work and on time and quick to do the work.”
The 15 contractors listed for Lancaster, PA insulate attics, walls, crawl spaces and rim joists. Details under each one about materials, hours and the services advertised are copied from the company's own site; star ratings and comments come from public reviews.
Area overview: Lancaster, PA
7 of the 15 contractors we list are based in Lancaster; the other 8 serve Lancaster from towns including Leola (7 mi), Lititz (8 mi) and East Petersburg (5 mi). The contractors on this page are rated from 4.5 to 5.0 across 5,195 reviews; 5 have 50 or more reviews. The topics that come up most in reviews of the contractors on this page are "estimates", "price" and "quality". 2 are open around the clock; 4 are open on Saturdays and 3 on Sundays. 3 show a license on their websites; 1 lists staff certifications (HAAG) and 4 have a BBB rating of A or A+. Domain records put 12 websites of the contractors on this page at ten or more years old; the oldest dates from 1995. 3 offer emergency call-outs; 5 offer financing or payment plans; 7 give free estimates; 3 are family- or locally-owned and 2 list coupons or special offers. We have a website on file for all 15 of the contractors on this page; 13 publish a contact page and 7 list a public email. We count these figures across the contractors on this page; distances are straight-line, and hours and prices change, so confirm the details with the contractor before you book.
How many listings here have a website?
A website is on file for all 15 contractors here. Use it to see which materials they actually install, since a firm that only sprays foam will recommend foam. A contractor with no site is not automatically worse, but you will have to ask on the phone what the site would have told you.
Irex Services LLC
Zimmerman's Roofing
“Brandon was very timely and courteous and very friendly and he quickly quoted and repaired my roof.”
Graystone Roofing & Siding
“They showed up on time , worked diligently and finished within a day and a half.”
Lantz Insulation
“Their people were great to work with, and the turaround time through the whole process was exceptional, especially considering today's business climate and the service you get from some companies.”
SL Siding & Exteriors
“They replaced our roof in 2020 and in November 2025 installed new siding.”
Weaver Superior Walls
“Weaver Precast has continued to impress me with their level of commitment to the construction industry.”
L C Insulation Inc
Morgan Run Builders
“Thanks to Andrew we had a tiny house built in good time with great attention to detail and incredible workmanship.”
Glick Brothers Roofing
“He is very honest and the neighbors were amazed at how hard they worked.”
Why these companies made our list
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