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.

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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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The Evergreen team was amazing from initial assessment and planning to the crew that came to complete the work. Our basement encapsulation is the best money we've spent on our house by far. The work was thorough and high quality. And what a wonderful group of people to work with. I highly recommend Evergreen!

Martha Bracy

We had a fantastic experience working with Evergreen to insulate our roof this winter. Everyone was extremely friendly throughout the process - the crew at our home worked hard, were approachable with questions, and the team leader even showed me around the project to point out specific areas they were working to improve.

Joel Wentz

They were highly recommended. I found them to be very knowledgeable and so helpful, with practical ideas. Despite my not living within their service area, they were generous with their knowledge, describing the usual solutions to correct leaks in my basement, and what the result is likely to be by following path A, B or C, and why. I was discouraged. Talking with Evergreen helped me see that my basement problems are far from insurmountable and really, fairly common in 100-year old homes. There are proven solutions.

Rosalind J

Damariscotta

Evergreen has insulated two homes that we've owned now and both times we experienced exceptional service and craftsmanship. Our rep, Justin, went above and beyond answering questions and the installation team was attentive to every detail, including pulling out old poorly installed insulation and redoing a bathroom fan that wasn't up to current code. They also left the place spotless every day! Our home is already so much warmer this fall and we are looking forward to using less oil this winter.

Eva G.

Falmouth

I used to spend winters in the bathtub because my house was so cold. This was my first winter roaming around my whole house comfortably. This even led me to decorate a little. My heating oil usage has been reduced by over a quarter: I rarely have to boost the thermostat because the temp stays at a constant. The Efficiency Maine rebates, together with the energy savings, make it affordable for me to pay for the loan I took out to finance the project. I do not worry about my pipes freezing.

Claire Helene Bevan

Camden

We are thrilled with the job Evergreen did to transform our 213 year old home into a warm, draft-free, cozy space. The entire team led by Bruce was prompt, courteous, knowledgeable, and hard working. If Evergreen could transform our home in this way, we are sure they would make a comparable difference in YOUR home!

Jonathan M.

Bridgton

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

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

We just finished a large project air sealing and reinsulating our 1890s basement and attic. It 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.

E Gallant

Kennebunk

"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.

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

The folks at Evergreen did a great job fixing a rather major insulation problem in my house, which they helped identify with a great audit. When the work began, they were thorough, upbeat, and -- dare I say it -- efficient. I strongly recommend them.

Michael Williams

Really great experience from start to finish with Evergreen. They helped us prioritize what needed to be completed first, and has made a significant difference in our hearing costs already. Plus they were really friendly and considerate to work with!

Amy W.

Kennebunk

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 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

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