Top-rated insulation pros.

Get matched with top insulation pros in Dover, DE

Enter your zip and get matched with up to 3 pros

Matching on HomeAdvisor

Share some details icon
Share some details about your home project.
Match with local pros icon
Within moments, match with highly-rated local pros.
Compare quotes icon
Compare quotes and choose the best pro for the job.

Top-Rated Insulation pros in Dover - Updated Nov 2026

Avatar for Insulation Guyz
Insulation Guyz
5.0(
82
)

Serving Dover, DE and surrounding areas

Approved

In business since 2006

Free estimates

Small jobs welcome

"We decided to install insulation in the attic and crawl space a couple of months ago. We got an estimate from Mike and two other companies but he offered us the most competitive deal. Mike and his crew showed up on time, installed the insulation and cleaned up after the job was done. Communication was excellent throughout the entire process. We highly recommend Handyman Insulation for this kind of work."
Response time2 days
2 neighbors recently requested a quote
Recommended by96%of homeowners
Avatar for MSJ Attic Insulation
MSJ Attic Insulation
5.0(
6
)

Serving Dover, DE and surrounding areas

Approved

In business since 2021

Free estimates

Emergency services offered

"Did a great job on the insulation however they left a hole in the ceiling when they dropped something on the attic floor. Not a big deal but they need to be careful. Overall, amazing work they do all kinds of insulation and they also install radiant barriers on roof joists. They are reasonably priced and the crew is super friendly, pleasure to work with."
Business card
Poorly insulated
Poorly insulated
In progress
Radaint barrier

+6

42 neighbors recently requested a quote
Avatar for Dixie's Insulation, LLC
Dixie's Insulation, LLC
4.5(
49
)

Serving Dover, DE and surrounding areas

Approved

In business since 2006

Free estimates

Small jobs welcome

"I had Javier check to see if I needed new underbelly insulation on our mobile home. I could not crawl under the trailer to see if this work was needed. He could have taken advantage of the situation, but said all I needed was two patches and ground cover. They actually installed three patches with no additional cost. Honesty, integrity and professionalism are key to this business."
Installing Insulation and Poly in a crawlspace
Installing Insulation and Poly in a crawlspace
Crawlspace Job
Batts insulation
Batts insulation

+7

Response time3 days
34 neighbors recently requested a quote
Recommended by97%of homeowners
Avatar for Sagittarius Airseal
Sagittarius Airseal
4.8(
31
)

Serving Dover, DE and surrounding areas

Approved

Super Service Award Winner

In business since 2019

Free estimates

Emergency services offered

"Edgar listened to my request to perform the tasks of insulating the HVAC ductwork and hotwater lines before installing the R30 batts in the joists. He did a good job in cleaning up the fallen insulation pieces from the floor, but there was still residual insulation dust on the floor and on my storage boxes. The tape he used to secure the ductwork insulation batts kept coming undone after he left, which I later re-taped myself. Overall, the quality of the work was great, but the cleanup could only be rated as 'Good'."
Blowing insulation
Blowing insulation
Blowing insulation
Blowing insulation
Blowing insulation

+38

Response time12 hrs
Response rate85%
12 neighbors recently requested a quote
Avatar for RetroFoam of Philadelphia
RetroFoam of Philadelphia
5.0(
22
)

Serving Dover, DE and surrounding areas

Approved (Corporate)

In business since 2023

Free estimates

Warranties offered

"These guys were professional, on time and communicated very well... I would recommend this company to you for all your Spray Foam Insulation needs..."
RetroFoam Wall Insulation
Installing RetroFoam
RetroFoam with Siding
RetroFoam with Brick
Response time1 day
Response rate100%
121 neighbors recently requested a quote
Avatar for Home Genius Exteriors
Home Genius Exteriors
4.9(
509
)

Serving Dover, DE and surrounding areas

Approved

In business since 2004

Free estimates

Credit card accepted

"The Crew was informative, pleasant, and easy to communicate with. Whenever I brought up an issue, they addressed it and made the necessary corrections. Joseph Stanley was Prompt, professional, and maintained great communication throughout the process"
Windows
Windows
Windows
Windows
Windows

+69

6 neighbors recently requested a quote
Recommended by49%of homeowners
Avatar for Lawson Home Services, LLC
Lawson Home Services, LLC
4.6(
60
)

Serving Dover, DE and surrounding areas

Approved

In business since 2010

Free estimates

Emergency services offered

"We were extremely happy with our recent service. We really liked that he showed us the aspects of our dryer and vent and how we can keep it clean on a weekly basis. He was very tidy too! I would definitely recommend him and plan to have him return each year."
Metal Door Crawlspace Entrace
Turtl Crawlspace Entrance
Attic Air Leaks
Attic Air Sealing
Garage Loft Ready for Sprayfoam

+137

Response time9 hrs
153 neighbors recently requested a quote
Recommended by92%of homeowners
Showing 1-10 of 44

FAQs for insulation service projects in Dover, DE

Old insulation should be removed when it shows damage, contamination, or heavy deterioration. If you notice water stains, rodent droppings, mold, or large gaps, plan on taking it out to protect your home’s energy performance and indoor air quality. Removing compromised material eliminates health hazards, cuts energy loss, and sets the stage for a safer, more efficient attic—all while keeping utility bills in check.

R-value measures how well insulation resists heat flow—the higher the number, the better it slows heat transfer. The right R-value keeps your home warmer in winter and cooler in summer, saving energy year-round. Match the rating to your climate zone and have a pro verify performance over time, because moisture or settling can lower R-value and cut efficiency.

Attic insulation can stay in place for 80 to 100 years, but its performance often drops after the first 15. As dust, moisture, or mold build up, the material loses R-value and allows heat to escape. Schedule periodic inspections so a pro can tell you when replacement makes sense—helping you keep energy bills down and indoor comfort up.

You can over-insulate an attic. Beyond the recommended R-value, extra layers don’t add efficiency and can trap moisture, leading to mold or reduced performance. A local insulation pro can measure current levels, confirm the right target for your climate, and advise on any adjustments so you avoid future energy or maintenance headaches.

Insulation can be damaged by mold, pests, water leaks, or accidental electrical contact. When the material is compromised, it loses R-value and can introduce health hazards. Removing and replacing affected sections restores efficiency, while routine inspections from a qualified pro help you catch problems early and keep your attic safe and energy-smart.

The Dover, DE homeowners’ guide to insulation services

From average costs to expert advice, get all the answers you need to get your job done.

  • carpenter repairing the roof of a house

    Use this guide to budget for roof repair costs based on factors such as roof condition, materials, size, repair type and severity, and more.

  • fascia and soffits being replaced on roof of house

    Need fascia and soffit repairs? Hiring a pro ensures proper installation, protects against pests, and prevents structural damage. Learn about common warning signs, material options, and how fascia and soffits safeguard your home from moisture.

  • new roof installed on house
    •

    Our comprehensive cost guide will help you explore the costs associated with roof replacement, including roof pitch, shape, design, square footage, and more.

  • Two hvac systems

    Learn who to call for HVAC inspection. Discover which pro to hire, what to expect from an HVAC inspection, and average costs for your home.