We are a design-build firm that specializes in building energy use. We aim to massively reduce carbon emissions and energy use in the built environment while using local, responsible, non-toxic materials. In our building and remodeling work, we integrate beauty and building science to build homes with superior health, comfort, performance and durability.
We are the only FSC certified builder in the US. And, we have a team of energy experts and moisture analysts that carry certification through the Building Performance Institute (BPI) and Passive House.
Business highlights
22 years of trusted experience
Services we offer
Major and minor remodels, new construction, accessory dwelling unit (ADU) additions
I sent an e-mail and they quickly got in touch with me to schedule a phone call with a rep. A few days later we talked for an hour and he gave me a rough estimate and said he'd like to come for a site visit. And he did. He spent an hour talking about two different options with us and continually attempted to guide us toward what he would do with our situation to fit his tastes rather than what we wanted. Fine. We would be willing to keep the work going in the right direction but it got tiresome. He made a bunch of pictures and said he'd follow up in a few weeks with an estimate. We haven't heard from him since (and gave the project to someone else).
Description of Work: We asked Green Hammer for an estimate for adding a second bath to our home .
Rating Category
Rating out of 5
professionalism
2.0
responsiveness
3.0
punctuality
3.0
$50,000
Larry B.
08/2015
5.0
heating & air conditioning/hvac, insulation, home remodeling, replacement windows
+ 2 more
I'd worked with these people on a project at a previous house, and had really enjoyed working with them. I'd readily work with them again, but on a large project like this one, I would play a very prominent role as "manager" of my own project interfacing with them. Put everything you want into clearly composed emails, so there is a written track record. But I think that is just a common-sense good approach with any project such as mine. On both projects, the work was done with high quality. And all Green Hammer personnel were pleasant, well-informed, willing to readily share information about their work and helpful. GH made this big complex project relatively easy. There were just a couple things that went awry in the project... Wiring for a 2d floor smoke alarm was NOT connected to an available nearby circuit dedicated solely for all house smoke alarms, but was instead wired into another circuit in the house. I had mentioned that "smoke alarm" circuit in conversation with the GH project lead, but I should have been a bit more formal by putting that in writing in an email etc. Or I should have been present to go over this detail with the electrician myself. On both this and the earlier project, the intent was for re-roofing to also include fixing drooping roof ends which over the years had pulled corbels out of their positioning on the house exterior. And in both projects, this fix was not implemented as desired. In the earlier project GH roofing sub-contractors did make an IMPROVEMENT. In the 2d project that is the specific focus of this review, it's more complicated. Historic district restrictions prevented the most obvious approaches that might have been applied. After the roof was done and I mentioned that the roof end drooping hadn't been fixed, GH said that the mechanism they'd planned to apply didn't seem workable after they had the roof off. So apparently there was simply a decision to make no improvement at all. If I were to engage GH for similar work again fixing drooping roof ends, I would be VERY tenacious and visible with them about this roofing "fix". I'll repeat however that my review is very positive and I'd work with GH again. But it makes sense to play a strong "project manager" role yourself while interfacing with them. Maintain knowledge and clear written communications about your details, and follow up to make sure those are understood and implemented. But I think this would be true in EVERY big project.
Description of Work: reroof house; remove 2d floor ceiling, apply spray foam insulation below roof, re-install new wallboard on 2d floor ceiling; install improved kitchen exhaust hood and venting; install exhaust system in 2d floor bathroom; install new high efficiency water heater; install new high efficiency gas furnace and remove chimney stack for old furnace from basement through 2d floor roof; install 5 new energy conserving windows; assist with fulfilling requirements of historic district review process (my house is in a designated historic district)
Rating Category
Rating out of 5
quality
5.0
value
3.0
professionalism
5.0
responsiveness
5.0
punctuality
5.0
Yes, I recommend this pro
$62,000
Rhia W.
05/2015
5.0
insulation
+ -1 more
I was very happy with them, they were proffesional, and very clean. I would recommend.
Description of Work: They insulasted my attic and basement.
Rating Category
Rating out of 5
quality
5.0
value
5.0
professionalism
5.0
responsiveness
5.0
punctuality
5.0
Yes, I recommend this pro
Christian M.
01/2015
5.0
insulation
+ -1 more
This was our first big home renovation on a newly purchased 1926 Irvington house. Greenhammer was very professional and responsive from start to finish. They provided excellent design-to-completion guidance and overall the complex project with many moving parts was finished without any major setbacks or headaches. And honestly, this was more than I expected. The project schedule and pricing was very transparent and changes we asked for half way through (for example, we decided to remove the chimney), were quickly accommodated. Overall I thought we thought the subcontractors did strong quality work and Greenhammer project lead stepped in immediately whenever there was a quality issue. I felt they had our backs the whole time.
Description of Work: Complete kitchen renovation down to the studs with custom cabinetry from Urban Timberworks (partner company) Insulation and energy efficiency improvement in coordination with Clean Energy Works skim coating and refinishing several lathe-plaster walls New water line, extensive plumbing and electrical work
Rating Category
Rating out of 5
quality
5.0
value
4.0
professionalism
5.0
responsiveness
5.0
punctuality
4.0
Yes, I recommend this pro
$120,000
William S.
08/2014
4.0
insulation
+ -1 more
Very well. Very complete and timely. Although we did not use them in this project I wouldn't hesitate to hire Green Hammer in the future.
Description of Work: Gave an estimate for insulation.
Rating Category
Rating out of 5
quality
5.0
value
3.0
professionalism
5.0
responsiveness
5.0
punctuality
5.0
Yes, I recommend this pro
$4,000
Jan N.
09/2013
5.0
heating & air conditioning/hvac, insulation, replacement windows
+ 1 more
It went great. They did everything I needed done. I would recommend them to others.
Description of Work: I used Green Hammer to insulate my house, replace windows, and put a new furnace in.
Rating Category
Rating out of 5
quality
5.0
value
5.0
professionalism
5.0
responsiveness
5.0
punctuality
5.0
Yes, I recommend this pro
$18,000
Leah K.
06/2013
5.0
flooring contractor, remodeling, home builders, home remodeling
+ 2 more
They were excellent! They pay attention to detail. We hired them because of their focus on energy conservation and green products.
Description of Work: They did almost a whole home remodel. They have done everything from kitchen, bathrooms, flooring and much more.
Rating Category
Rating out of 5
quality
5.0
value
5.0
professionalism
5.0
responsiveness
5.0
punctuality
4.0
Yes, I recommend this pro
Marina S.
03/2013
4.0
heating & air conditioning/hvac, insulation, siding
+ 1 more
I liked that they were local and that they were green. There was kind of a mix up because the guy who was in charge of our account quit in the middle of it, so there was this kind of overlap where there wasn't any work done for three days and no one knew what was going on. They made up for it and gave us a discount. They were pretty professional and did a very good job. They had some very good artisans and people that knew what they were doing. They were also here on time.
Description of Work: Green Hammer insulated our house including the attic. We took off the asbestos siding ourselves and they cleaned things up, so it looked like the original house. They also installed a heat pump and a backup gas furnace.
Rating Category
Rating out of 5
quality
5.0
value
5.0
professionalism
5.0
responsiveness
4.0
punctuality
5.0
Yes, I recommend this pro
$30,000
Response from Green Hammer
Thanks for your understanding regarding the project manager transition that happened during the installation of your project. That was a challenging transition for us to navigate, and working together with a considerate client like yourself made it possible to arrive at a successful project with a minimal amount of disruption. It was a pleasure working with you! Best, Devan
Joanna M.
01/2013
3.0
energy audit, insulation
+ 0 more
Not too well. They were nice enough when we discussed the problems, but they did not deliver. I think their reputation is overinflated.
Description of Work: Green Hammer did our energy audit and agreed to weatherproof our house and blow in insulation into our attic. They had to be micromanaged to finish the job and still missed key places they promised to do (which appeared on our bill as completed). We also looked into them having manage our window insulation but found them to be unresponsive and expensive.
Rating Category
Rating out of 5
quality
2.0
value
2.0
professionalism
3.0
responsiveness
3.0
punctuality
3.0
$4,000
Response from Green Hammer
Hello Member, Thanks for reporting your concerns about your experience with Green Hammer. Unfortunately your project happened during a transition time for one of our employees, and he is no longer employed at Green Hammer. I realize in this instance that our work was not up to our usual standards. If I recall correctly, I listened to your concerns, asked what I could do to make it right, and was agreeable to the financial adjustments you proposed. I'm sorry you had this kind of experience with Green Hammer, and we are all grateful for this opportunity to improve. Best, Devan
Overall they did an excellent job. I will definitely use them again.
Description of Work: They installed new sidings, built a new deck and did some repairs.
Rating Category
Rating out of 5
quality
5.0
value
4.0
professionalism
5.0
responsiveness
5.0
punctuality
5.0
Yes, I recommend this pro
$100,000
Daniel G.
05/2012
5.0
energy audit, insulation
+ 0 more
They did an excellent job as they methodically went through all the different energy uses of my home. It took about four hours to do the energy assessment and about an hour and a half to meet with the representative to review their recommendations. The report was thorough and representative, a passionate but very pleasant environmentalist, was very thorough and knowledgeable about the particular features of my home's energy assessment report. I didn't do the recommended work right away because other expenses piled up but I'm glad to have the report and assessment. The prices for contracting the work through Green Hammer were fair, but on the high side.
Description of Work: These guys came to my house to do a complete energy audit. This includes going over all my energy bills and a complete inspection of the home with respect to heating, hot water, air movement, and insulation.
Rating Category
Rating out of 5
quality
5.0
value
5.0
professionalism
5.0
responsiveness
5.0
punctuality
5.0
Yes, I recommend this pro
$400
ANN K.
05/2012
5.0
insulation
+ -1 more
We have an old 1909 Dutch Colonial home that has no exterior insulation. Green Hammer came to the house, inspected it, and told us exactly what 3 other companies had said: that it would not be cost effective to insulate our home. Because of it's odd construction and big sun porch in the upstairs, even if insulated, the heat loss would remain. They took a great deal of time to think of solutions and I appreciated their honesty even though it was bad news.
Description of Work: Invited the company to give us an estimate to insulate our home.
Rating Category
Rating out of 5
quality
5.0
professionalism
5.0
responsiveness
5.0
punctuality
5.0
Yes, I recommend this pro
MARY F.
04/2012
5.0
insulation
+ -1 more
From the start, every person I dealt with was very qualified and professional. This is an amazing company.
Description of Work: Whole house air sealing. Attic flat insulation and rim join insulation.
Rating Category
Rating out of 5
quality
5.0
value
5.0
professionalism
5.0
responsiveness
5.0
punctuality
5.0
Yes, I recommend this pro
$3,800
Christopher N.
03/2012
5.0
energy audit, garage builders, remodeling, home builders, heating & air conditioning/hvac, insulation, home remodeling, replacement windows
+ 6 more
Green Hammer took what is normally a very complicated and stressful process and made it easy and fun. We loved the individuals we worked with who were pleasant, punctual and cleaned up after themselves. They recycled most all of the construction debris and were mindful of existing vegetation. They did a lot of research on how to construct our home which is made out of unusual materials with a geothermal heat pump and radiant heating system and kept us informed of the options and associated costs. The quality of the construction is excellent. They have returned to do small projects since the initial construction of our home with the same great results. I wish we had the money to build another house because working with them was a rewarding experiance.
Description of Work: Constructed a custom built LEED Gold green home and additional cabinetry a few years later.
Rating Category
Rating out of 5
quality
5.0
value
4.0
professionalism
5.0
responsiveness
5.0
punctuality
5.0
Yes, I recommend this pro
$500,000
Benjamin R.
02/2012
4.0
insulation
+ -1 more
Their punctuality and professionalism stood out. I was happy with them.
Description of Work: They did some insulation work.
Rating Category
Rating out of 5
quality
4.0
value
5.0
professionalism
5.0
responsiveness
5.0
punctuality
4.0
Yes, I recommend this pro
Kaitlin G.
02/2012
5.0
insulation, structural engineer
+ 0 more
They were professional. They were connected to all the rebates and made it easy for us. They were here when they said they would be and they handled the subcontractors well. They were all around excellent.
Description of Work: They did a complete weatherization insulation job. And they also did preventive earthquake stuff.
Rating Category
Rating out of 5
quality
5.0
value
5.0
professionalism
5.0
responsiveness
5.0
punctuality
5.0
Yes, I recommend this pro
Emily D.
12/2011
5.0
energy audit, insulation, siding
+ 1 more
Jesse oversaw everything very well. He was timely and communicated regularly, especially about several added in costs. I felt like he did more than his job expectations, despite his busy schedule.
Description of Work: Performed home energy audit. Found catastrophic duct failure. Coordinated with insulation subcontractor to fix this and to work and roofing company to blow in foam insulation during roof tear off. Worked to replace wood rot, some sections of bad siding.
Rating Category
Rating out of 5
quality
5.0
value
5.0
professionalism
5.0
responsiveness
5.0
punctuality
5.0
Yes, I recommend this pro
$13,000
Bruce H.
08/2011
5.0
energy audit, remodeling
+ 0 more
It was very clear. They were very responsive and quick to get back to us. We just liked their attitude of how they approached the work. They gave us some very creative ideas on how to save money. So we would probably be working with them. Their attitude seems to be really for the best interest of the person that’s hiring them versus the company making the most money that they could fake. So I would say that the one thing very attractive about the people we’ve talked to was that they really seemed, their attitude really seemed to be towards doing the best work that they can do and also do it in an environmentally sustainable way versus making the most money they can make.
Description of Work: Green Hammer gave us a proposal, a couple of weeks ago for energy efficiency work and general remodeling.
Rating Category
Rating out of 5
professionalism
5.0
responsiveness
5.0
punctuality
5.0
Yes, I recommend this pro
Damion S.
07/2011
3.0
remodeling, heating & air conditioning/hvac, insulation
+ 1 more
They were part of an energy audit. We paid an energy advocate to come in and sign off on the job after it was finished. This particular job was kind of a pain in the rear for them because they subbed out some of the ceiling work. One of their subs wasn't very thorough and the management of the project wasn't timely due to other problems that occurred. Overall the project manager didn't keep the job in line as well as he could have. It was partially the sub's fault. The sub did a horrible job on the duct ceilings so they had to come in and fix it and then they had to come back and redo it again. They redid it once and then had to come and do some touchup work the second time. They had to redo the work until we were satisfied because we had the advocate and we wouldn't sign off on any of the payment paperwork until we were satisfied. It was a pain for them but really good for the consumer. We only had one bid. The majority of the price was the furnace installation. Some of the quality was good and some of it was bad. A lot of the issues with Green Hammer were the subs' fault. They used garbage subs. The work was pretty average.
Description of Work: We had an energy upgrade to our house with Green Hammer. They did blown in insulation and ceiling work. It included some HVAC work and a furnace addition.
Rating Category
Rating out of 5
quality
4.0
value
4.0
professionalism
4.0
responsiveness
4.0
punctuality
4.0
$18,000
Benjamin R.
07/2011
5.0
insulation, siding
+ 0 more
They were professional and punctual with their work. They did a good job of removing existing siding boards and installing insulation then reinstalling siding. The only issues I had was that they forgot to reinstall one board and drilled a couple more holes through the siding than originally agreed on. Overall I would recommend them.
Description of Work: Green hammer installed blown in insulation on our 1924 house.
Rating Category
Rating out of 5
quality
4.0
value
5.0
professionalism
5.0
responsiveness
5.0
punctuality
5.0
Yes, I recommend this pro
$2,500
samuel D.
06/2011
5.0
insulation
+ -1 more
They were expensive. I had some other companies give me bids and they were less expensive. But, Green Hammer seemed to be very thorough and they took a lot of things into consideration that other companies did not. They are great.
Description of Work: Green Hammer gave me a bid for insulation a couple of weeks ago.
Rating Category
Rating out of 5
professionalism
5.0
responsiveness
5.0
punctuality
5.0
Yes, I recommend this pro
$16,000
STEPHEN W.
05/2011
5.0
energy audit, remodeling, insulation
+ 1 more
Green Hammer is an excellent company. We were treated with courtesy and professionalism throughout the process. They came in on time and on budget. They are extremely knowledgable about all phases of construction and energy efficiency. Their subs were excellent. We are very pleased, and we would hire them again without question. They worked extremely hard to get a good result for us, and we are very happy with our remodeled house.
Description of Work: Green Hammer Construction did a major remodel of our 1920s bungalow. They completely remodeled the second floor by taking out all the walls and adding a large dormer. That addition gave us enough room for a bathroom and two bedrooms. They completely reworked the staircases to the second floor and basement. They finished out the basement space and made some significant cosmetic changes to the main floor. They also upgraded our energy efficiency by insulating the entire house and re-working our HVAC system. They added mechanical ventilation.
Rating Category
Rating out of 5
quality
5.0
value
5.0
professionalism
5.0
responsiveness
5.0
punctuality
5.0
Yes, I recommend this pro
PATRICIA P.
03/2011
5.0
energy audit, insulation
+ 0 more
In all three cases, the work was done with attention to detail and explanations of the processes being used to determine the overall "score" for the house...and to determine where problem areas existed. Scott, Andrew, and Tyler discussed the testing processes, results, and helped us determine just where our main issues were. They were great with suggestions about areas with problems and what was serious and what wasn't. They discussed the test numbers and what those numbers meant. They worked to make sure everything needed was done with as little interruption to our lives as possible. While they were not responsible for the work that was done, the testing information they found helped determine where the biggest issues were and what steps we might discuss with the contractor to improve energy efficiency. They also made us aware of the need for CO2 detectors and at their recommendation we also added an HRV unit to deal with potential moisture issues as the house was better sealed.
Description of Work: Green Hammer was used for test-in and test-out on an energy audit for developing a scope of work to improve insulation and energy efficiency of our home. Blower door and duct testing was done in October and two test-outs were needed in Feb. and March 2011 to assure work was complete by the contractor and that desired improvements were met. Green Hammer did only the testing, not the actual work of weatherizing/insulating. Their information was very valuable in determining the scope of work to be done.
Rating Category
Rating out of 5
quality
5.0
value
5.0
professionalism
5.0
responsiveness
5.0
punctuality
5.0
Yes, I recommend this pro
$300
Christine E.
01/2011
5.0
energy audit, garage builders, remodeling, insulation, replacement windows
+ 3 more
The overall experience was great. We contacted Green Hammer because of their reputation for green building expertise and were not disappointed. Their knowledge and professionalism was superb -- helping sort out various product choices and giving us candid assessments of what would work best for us and our home. They were exceedingly careful in making sure we were getting what we wanted in terms of window aesthetics including different performance characteristics for north vs. south facing windows. They take pride in their work, craftsmanship, and customer service -- and it shows. Beyond that, they were simply a pleasure to work with. We wouldn't hesitate to work with them again.
Description of Work: Green Hammer conducted a full-house energy audit and followed up with recommendations on cost-effective strategies to reduce energy use; researched window options for our 1926 home that would be superior in terms of energy, aesthetics and sound control; procured, installed and trimmed out the five windows to match existing woodwork; completed partial insulation work in several areas of the house and conducted several minor repairs.
Rating Category
Rating out of 5
quality
5.0
value
5.0
professionalism
5.0
responsiveness
5.0
punctuality
5.0
Yes, I recommend this pro
$13,500
ALEX S.
10/2006
2.0
hardwood floor, home remodeling, replacement windows
+ 1 more
Our overall experience was not great. Steven was supposedly the general contractor on the job and there was poor coordination with the subcontractors. In addition, he was too hands-off and seemed busy with too many other jobs. The floors looked great once they were installed and the quality of the work was pretty good, but we were constantly having to track him down to find out when certain parts of the job were going to be completed. We finally took over the management of the projects ourselves.
Description of Work: Installed bamboo floors throughout the house, installed new windows and did a kitchen remodel.
Rating Category
Rating out of 5
quality
4.0
value
4.0
professionalism
3.0
responsiveness
1.0
punctuality
2.0
$7,500
Response from Green Hammer
TO RESPOND - THIS WAS AN UNFORTUNATE EXPERIENCE FOR GREEN HAMMER AS WELL. GREEN HAMMER WAS NOT HIRED BY THIS CLIENT BUT BY A THIRD PARTY. WE WERE NEVER IN CONTRACT WITH THE HOMEOWNERS TO DO THE KITCHEN (ONLY THE WINDOWS AND FLOORS) - WE WERE IN CONTRACT WITH ANOTHER COMPANY TO BUILD CABINETS FOR THEM. THE REASON THE HOMEOWNERS 'TOOK OVER MANAGEMENT' WAS BECAUSE WE WERE NEVER PAID TO DO SO. THE OTHER COMPANY NEVER GAVE US A DOWN PAYMENT - IN FACT IT WAS THREE MONTHS BEFORE WE EVEN GOT 25% DOWN TO BUILD THE CABINETS - WHICH PROGRESS HAD BEEN STOPPED ON BECAUSE LACK OF PAYMENT (THE OTHER COMPANY HAD BEEN SUPPLIED WITH THE NON PAYMENT BREACH OF CONTRACT NOTICE). I CAN'T BELIEVE THE COMPLAINT IS AGAINST GREEN HAMMER AND NOT THE OTHER COMPANY. NEEDLESS TO SAY GREEN HAMMER WILL NEVER TAKE A KITCHEN CABINET JOB FROM THE OTHER COMPANY EVER AGAIN.
All statements concerning insurance, licenses, and bonds are informational only, and are self-reported. Since insurance, licenses and bonds can expire and can be cancelled, homeowners should always check such information for themselves. To find more licensing information for your state, visit our State Contractor License Requirements page.
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Service Categories
Insulation,
Energy Efficiency Auditing,
General Remodeling,
Heating and Air Conditioning,
Kitchen and Bath Remodeling,
Garage and Shed Building,
Windows,
Siding,
Homebuilders,
Structural Engineering,
Hardwood Flooring Sales and Installation,
Handyman Services
FAQ
Green Hammer is currently rated 4.6 overall out of 5.
Sunday: Closed
Monday: 8:00 AM - 5:00 PM
Tuesday: 8:00 AM - 5:00 PM
Wednesday: 8:00 AM - 5:00 PM
Thursday: 8:00 AM - 5:00 PM
Friday: 8:00 AM - 5:00 PM
Saturday: Closed
Green Hammer accepts the following forms of payment: Check
Yes, Green Hammer offers free project estimates.
Yes, Green Hammer offers eco-friendly accreditations.
No, Green Hammer does not offer a senior discount.
No, Green Hammer does not offer emergency services.
Yes, Green Hammer offers warranties.
Green Hammer offers the following services: Major and minor remodels, new construction, accessory dwelling unit (ADU) additions