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.

EHP employees at work

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.

Learn More

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.

Learn More

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!

Learn More

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.

SCHEDULE YOUR FREE CONSULT TODAY

We couldn't be more pleased with the easy, professional, high-value service from Evergreen. Having purchased an older home that had been in our family for generations, we needed multiple upgrades, including insulation throughout. Evergreen insulated our attic with blown-in cellulose, built a new, super-insulated attic hatch, sealed off the old one (which was just a piece of plywood in a closet ceiling), and also talked us through our best options to upgrade our heating system given the plans we have to add onto the house.

Tom G.

South Thomaston

Evergreen is the "go-to" company for improving the efficiency of your home. There are others to choose from but none so effective, honest, and capable as Evergreen. They did a great quantity of dense packing cellulose to improve our home (both for energy efficiency and for sound insulation) and it was totally successful. They are on-time, helpful, and caring. They clean up to a level that can't be over emphasized. This was the second time we employed them and we'd use them again if the opportunity came. You'll not be sorry to select Evergreen.

Dirk F.

Belfast

The Evergreen Team did a fabulous job, well exceeding our expectations, In just over a week they transformed our very drafty, noisy 213 year old house into a snug, draft-free, quiet haven with warm floors! The team was prompt, did everything they said they'd do and more. We are thrilled!

Trudy M.

Bridgton

We just finished a large project of air sealing and reinsulating our 1890s basement and attic which had been completely renovated 8 years ago but still felt cold and lacked proper energy assessment and corrections. We met with Justin in December and were very impressed with his knowledge, professionalism and communication skills and knew Evergreen was who we wanted to work with. Dave was our on hands project manager and was excellent. The office staff has been quick to respond and helpful as well when needed.

Emily Gallant

Thanks Evergreen Home Performance for helping to make our home more efficient. Many thanks as well to Bryan for the initial walk through and recommendations to make our home more efficient and to Dave, Roland, and Jacob for a job that was done professionally and courteous.  We were amazed at the level of efficiency and everyday they made sure to protect our floors, carpets, and furniture. We had daily discussions with Dave about progress and what was being done and where they were at in the project.

Carol Fink

Led by Brian Robinson, the Evergreen Home Performance team just completed an insulation refit at my home. It was truly a great experience from start to finish, a period of time that was a fraction of the time that I originally anticipated due to the team's unbelievable work habits and professional knowledge of their tasks. As impressive were the communication skills and friendliness of each and every member of the team.

Anne W.

Rockport

I never leave reviews, but had a great experience with Evergreen and wanted to spread the word! In short, we worked with them to insulate our roof this winter and have noticed surprising immediate results. The constant ice dams I have wrestled with are completely gone, and the home is noticeably more comfortable. It's a little too early to tell if our oil bill is going to reduce, but I imagine we will see an impact there as well.

Joel W.

Portland

"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.

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

Several years ago Brian Robinson evaluated the crawl space at my summer home on Islesboro where I knew moisture was becoming a problem. I had done quite a bit of work in the space many years prior with mixed results. When Brian offered some suggestions, they were ideas that incorporated work previously done, and would be a relatively low cost effort to improve the situation. He offered this advice over several phone conversations of some length, informally, and at no charge.

Cliff R.

Islesboro

I cant say enough about this company and the benefits that it created for our family. They are very professional and have effectively re-insulated our home. The heating bill proves the point.

Bob O.

Springvale

We had Evergreen Home Performance of Rockland come in to make our home more energy efficient, and what a TOP notch crew. Brian and his crew did an amazing job from start to finish. Very knowledgeable and professional. We would Definitely highly recommend this crew to anyone who is looking for energy efficiency in their home with a company that truly is an expert and knows how to do a quality job and truly cares about their customer.

Melissa S.

Owls Head

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 waited a year to write this review. Evergreen finished our job late last winter. Terrific results!!! we've gone from 12-day propane deliveries to 30+ day propane deliveries. The house is noticeably warmer. The Evergreen crew was/is professional, prompt, thorough, scientific, gracious and immaculate with respect to keeping our house clean. Money well spent.

John E.

Boothbay

I was extremely pleased with the professionalism and quality of service that I received from the Evergreen team. I met Richard to discuss options for insulation. I knew immediately that I wanted to do business with them because he did not try to over-sell extra services that I did not need. Dave was the project manager. He was not only kind, but very respectful of my home. I would highly recommend this company.

Darlyann M

Bath

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