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
  • 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 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

Evergreen listened and produced a thoughtful evaluation, proposal and comprehensive plan for our attic and basement. They exhibited excellent workmanship, teamwork, and came back as planned after the completion of the job to test the outcomes. Their overall performance as insulation and home improvement contractors is truly outstanding and we highly recommend them.

Susan S.

Saco

We had Evergreen redo the insulation in our roof. The team handling our project did a great job. They left the house spotless. We've already noticed the difference in how much better our house is retaining heat. I would definitely recommend and will use them for future projects.

Ffej C.

South Portland

The Evergreen crew from initial inception to installation were professional, on time, and left our place spotless. The end result was exceptional.

John Brown

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

Working with Brian and with Nate and the rest of the crew was a pleasure. They made everything very easy and understandable. This was a major renovation and they were always at the ready with a lot of information. We had an extensive renovation on the basement which was a dirt basement and it came out beautifully. We can already tell from all of the insulation work what a difference it's made in sound and temperature. Brian worked with me on the rebates that are available when you do this kind of work. I would highly recommend this company to…

Valerie L.

Rockland

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

We initially contacted Evergreen through Efficiency Maine for an energy audit, which was conducted promptly and professionally by Justin McEdward, one of their Energy Advisors who is BPI-certified. After a thorough inspection of our newly purchased home, Justin explained in great detail what we needed and did not need. It was agreed that Evergreen would remove all of the existing attic insulation, which was not adequate, and replace it with blown in cellulose, to a rating of R-60.

Thomas W.

Scarborough

We had Evergreen come out to our tiny old (100+ year old) house to see what they would recommend for decreasing our carbon footprint, saving money, and increasing our comfort in the cold season. Richard and Bryan were great to work with, patiently answering our many questions and walking us through multiple options. We could only afford to tackle a few areas this year; we ended up replacing some windows and having them weatherize the entire house.

Alan M.

Falmouth

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 crew members from Evergreen Home Performance each made sure to greet us every day, while maintaining their distance in this time of the pandemic. Their work took a total of nine days, spread over three weeks. Even though they were working in multiple rooms of our house, as well as the basement and attic, they were unobtrusive and always cleaned up after themselves every day. The on-sight manager kept us informed of their daily schedule so we'd know which parts of the house they'd be working on.

Bob & Sue

Whitefield

The Evergreen Team did a fabulous job and was very tuned and responsive to the particular needs we had. The job was done right on budget and we are thrilled with the improved warmth and energy efficiency.

Ira M.

Rockland

Great job installing windows and insulation.

Bob S.

Rockland

From beginning to end – that is from the moment Justin McEdward stepped into our home to assess our energy conservation needs until the crew left – the Evergreen Home Performance process went absolutely smoothly. Justin made a thorough inspection and took pictures with an infrared camera. His proposal described the scope of work in detail, and he explained what we could expect the proposed work to accomplish. Our proposal was forthcoming within a couple of days, and Justin was available to discuss it and answer questions.

Adrienne Harkavy

We needed basement encapsulation to stop moisture coming up into the house from our regularly flooding basement. We had mold growing on windowsills and furniture. All the staff were friendly, respectful of our home, and easy to work with. Humidity has gone from 70% down to 40% and mold has not grown back after two months. Very grateful.

Sarah C.

Belfast

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