Energy Audits, Insulation, and Basement Waterproofing Services in Portland, ME

Make Your Portland, ME Home More Comfortable, Healthy, and Efficient

Beautiful Maine House

Whether you live in a historic West End Victorian or a 50s cape in Rosemont, chances are your home could use some improvements. Evergreen Home Performance is your trusted local Portland, Maine contractor with offices across the street from the Home Depot on Riverside. We’re the largest energy efficiency company based right in Portland and we’re here to guide you on your journey to energy-saving and home comfort upgrades.

From basement waterproofing to attic insulation, we offer proven solutions to make your home more comfortable, healthy, and affordable to live in, all year round. Since 2006, we’ve helped hundreds of Portland households improve their homes, and we’re ready to help you next!

Solving the Real Home Issues that Portlanders Face

We hear from Portland homeowners all the time about:

  • Wet basements and water pooling after storms
  • Musty smells and poor air quality coming from the basement
  • Drafty rooms, cold floors, and high heating bills
  • Frozen pipes, ice dams, and uneven heat in the winter
  • Bulkheads and basement windows that leak air or water
  • Moisture in crawl spaces causing rot and mold concerns
  • Overworked heating systems that never seem to shut off
  • Frustration from past attempts at “quick fix” renovations that didn’t last

From tight, 150-year-old crawl spaces to leaking foundation corners, we’ve seen it all—and we know how to fix it.

Evergreen’s Portland Services Include:

Home Energy Audits

Every home has a story—and we start by listening. Our comprehensive home energy audit reveals where your Portland home is losing heat, leaking air, or holding moisture. From Victorian-era homes to newer builds, Evergreen’s energy audits and thermal energy inspections lay the groundwork for smart, effective upgrades.

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Insulation & Air Sealing For Attics, Walls, and Basements

Looking for an insulation company in Portland that does more than just blow in cellulose? We combine insulation upgrades with strategic air sealing to deliver lasting results. Whether your home needs attic insulation, dense-pack wall insulation, or spray foam for your basement, we’ll create a plan that fits your house and your budget.

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Basement Waterproofing for Portland Homes

Basement waterproofing in Portland, Maine homes is essential—especially in older homes. Evergreen offers comprehensive waterproofing systems that include sump pumps, French drains, vapor barriers, and basement dehumidifiers. We provide crawl space encapsulation for homes with both basements and crawl spaces, and with all of our work, we drain the water out right, radon tight!

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Efficiency Maine Rebates & Financing

We help more Mainers claim Efficiency Maine rebates than any other insulation contractor—including homeowners in Portland. You could qualify for:

  • Up to $8,000 in Maine energy rebates
  • Up to $1,200 in federal tax credits
  • Financing through Efficiency Maine’s Green Bank or NEIF—with payments as low as $50/month

Hear From Your Portland Neighbors

Here’s what just a few of the many Portlanders we’ve helped over the last two decades have to say about working with Evergreen:

Evergreen Home Performance has now done a number of jobs for us to make our home more energy efficient. In 2019 they insulated our basement (spray foam) and replaced our basement windows, and this year they insulated our attic. Bryan Pringle, one of the energy advisors, could not have been more friendly and helpful in informing us of our options and helping make decisions, not to mention getting his hands dirty during the basement window operation. And he didn’t even make fun of us for inquiring, and eventually installing, a custom cat door into our basement window. Bruce Merryman and his technician did a fantastic job of squeezing into our tiny attic space and sealing up all the drafty areas before blowing in the insulation. I often tell my husband that if only every experience with home improvements could be as easy as working with Evergreen, then my life would be a lot easier.

Caroline Sanford

We found Evergreen online, and are very happy that we did. The team was courteous, and friendly, in a genuine way. And they kept the house very clean, including meticulously installing and dismantling barriers for dust control, every morning and evening. We felt in good hands the whole way through. The attic looks like it’s been sealed up by NASA now (not kidding). Towards the end of the job, there were some details that had to be dealt with unexpectedly. Brian came through with some ideas, and put in extra time to try to resolve things. And Chris Kessler was exceptional. He first came to create an estimate, and was very knowledgable and thorough. Further, he paid close attention to the legal/administrative end of things, and was able to ensure that Efficiency Maine contributed a very substantial sum to the project cost. All in all, I’m extremely happy with Evergreen, and would not hesitate to call upon them again. Highly recommended.

Gael McKeon

Working with Evergreen was great. Chris came out for an energy audit, gave us lots of good insight on things we could do, listened to our concerns, and put together a thoughtful proposal. The crew came out over a couple of days and did a fantastic job with the installation, always leaving the work areas spotless at the end of the day.

Jason Dark

We could not have had a better experience working with Evergreen Home Performance specifically under the guidance of Chris Kessler and the crew project managed by Red. All aspects of the work were well communicated and executed with precision. Chris took the time to fully explain the “why’s” of the scope of work they were doing and even went the extra mile to point out some DIY improvements we could do ourselves to further the impact of the job. Red was a wonderful communicator each day the crew was at our home and always left the house cleaner than when they had entered. We are noticing a huge difference in the comfort of our home, thank you Evergreen!

Emily Brunick

Evergreen Home Performance Team Setting-Up At House For Work

Get Local Expertise with Evergreen

We’re more than just contractors in Portland, Maine—we’re your partners in making your home more efficient, healthy, and resilient. We’re members of Portland Buy Local and have employees who live in the city. From attic insulation to crawl space encapsulation, we’ll help you build the right plan and get the job done right.

Let’s build the right plan for your Portland home — call 207-594-2244 or book your free consult online.

From flooding basements to chilly bedrooms, Evergreen helps Portland homes stay dry, warm, and energy efficient.

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A thorough inspection of our (older) house and its energy needs. Competent and personable work crew.

Jacob Watson

I cannot say enough great things about working with Evergreen Home Performance. Everything including the initial consultation, the fabulous work crew, the office support and the final resolution was handled in a caring and professional manner. My only regret is that I did not know about them earlier. I enthusiastically recommend Evergreen to anyone with concerns about home energy use.

Darlene R

Bath

I would recommend Evergreen wholeheartedly because of their professionalism, their follow through, and thoughtful project planning.

Jennifer A

Evergreen did a fantastic job insulating our 1930's home. The onsite team was professional, clean, and really just a joy to interact with throughout the process. A blower test at the end showed a significant decrease in air leakage. I highly recommend Evergreen.

Kristen H.

South Portland

Great company. Very professional and thorough. They take the time to explain everything and offer options to fit your budget. Wonderful experience from start to finish.

Bonnie Eustace

My experience with Evergreen was excellent. From their thorough and thoughtful initial consultation to their detailed post-work visit, the team was professional, knowledgeable, and responsive. Their workmanship was top notch. Our home is now much warmer and more efficient. I highly recommend their services!

Douglas R.

Edgecomb

Our house still the most efficient home we’ve ever lived in. And we have you folks to thank for that! A special howdy to Brian Robinson please!

Bruce O’Donal and Eva Butler

I was very impressed by the professionalism of this company and the workers. Brian R. was very prompt in replying to my questions; the crew was meticulous in all parts of the work and attentive to the safety aspects concerning Covid; and Brian was extremely thorough in the final inspection. My attic is now snug and warm and I've noticed that the second floor is warmer as well.

Julia S.

Rockland

This team of individuals was professional at all times. They set up barriers that kept the dust at a minimum. They conducted an air flow audit and cut the draft circulation from the outside in half by sealing cracks. They hauled out the old insulation and replaced it with blown in insulation with an R - 60 Value. They also did the rebate paperwork so that I could get my $1500.00 rebate from the state of Maine. I highly recommend Evergreen Home Performance!

Daniel B.

Rockland

First we have Evergreen do a BIG project worth about $20K (windows, basement, insulate & rebuild an entire wall, a door, attics, and air sealing). They were so great we had them come back later when we decided we did want to do our other door. They are professional and do great work. They take care of your home and are trustworthy, and on top of all that friendly! I highly recommend you call them!

Garreth C Debiegun

I had gotten estimates from several other companies, but Evergreen was in another league entirely with their professionalism. If you want the job done correctly, I couldn't recommend this company enough.

Rayna Mayo

Freeport

The team members were very professional, worked very hard, paid very close attention to detail and cleaned up meticulously every day. I really appreciated the care they took knowing the smallest details were going to make a big difference to our heating bills. Thank you!

Pam B.

Brunswick

In the final stages of selling our home, and with a closing date set, an inspection came across an unanticipated issue in our attic. We quickly called in contractors, but nobody was able to identify the source of the problem. Then we thought of Evergreen. Brian Robinson was on site the next morning and immediately identified the source (a faulty roofing job completed three years earlier which had effectively sealed up portions of the ridge vent and restricted air flow - not easily visible with a quick inspection).

Robin McIntosh

Camden

Great job installing windows and insulation.

Bob S.

Rockland

"Working with Evergreen from start to finish was a great experience." See what our customers have to say about their experience with Evergreen Home Performance. 

Jeff L.

Portland Buy Local
Efficiency Maine
EPA Lead-Safe Certified
Building Performance Association
BPI Certified