755 Banfield Rd., Unit 102, Portsmouth, NH 03801

capstone mechanical

Certified Great Place to Work®​

We’re proud to be Great Place to Work® Certified - but even more proud of what that represents.​​
95% of our team says Capstone is a great place to work - far above the national average!​
That doesn’t happen by accident. It’s the result of a culture built on trust, accountability, and genuinely taking care of one another. From day one, our team members are supported, empowered, and given the opportunity to grow - both personally and professionally.
To us, this certification isn’t just an achievement - it’s a reflection of who we are and how we show up for our people every day.

Join Our Team!

Our People - their experience, expertise and willingness to think differently, makes us who we are. We are hard-working, kind, committed, and curious. We embrace challenges, and take care of each other and those around us. Our culture empowers independent thinking, and collaborative environments to continuously evolve our approach to benefit our customers, team members, and the organization.

Capstone Accelerate

We don’t just hire great people - we invest in building great leaders.

The Capstone Accelerate – Leadership Immersion Program is a 12-week leadership experience designed to prepare high-potential team members for future leadership roles within Capstone Mechanical. Through hands-on learning, mentorship, and cross-functional exposure, participants gain the skills, confidence, and perspective needed to lead in a fast-growing organization.

This program is more than development - it’s a launchpad. Participants work on real business challenges, build meaningful relationships across teams, and develop the leadership mindset needed to succeed in leadership roles.

At Capstone, growth is a partnership. We provide the tools, guidance, and support - you bring the curiosity, ownership, and drive.

What Our Team Values

Safety Always

We are all safety advocates: for ourselves, our team, and our community.

Customer Care

Provide an exceptional customer experience by understanding our customers' unique needs and providing proactive guidance.

Holistic Wellness

We look to take care of the whole human and aim to offer resources that encompass all aspects of life. We provide access to resources to guide our team members and their families along their unique personal wellness journeys through a comprehensive wellness program.

Capstone Culture

We are built on trust, transparency, personal development, and continuous improvement. We are a team that takes pride in our work, the relationships that we nurture, and building a sustainable future.

Autonomy

Freedom and flexibility provide our team with the autonomy to best support our customers at the point of service while sustaining personal well-being.

Team Member Reviews

"Worked for this Company for over 6 years. Best company I worked for, and they took care of you as an employee and a person. Wish I never retired from this awesome company.'
Service Technician
"Overall, Capstone Mechanical is a great company to work for. I have been in the industry 5 years, and I can honestly say, this company has offered me the work/life balance that I desire, and they genuinely care about you and your family."
Service Technician
"Great company culture. Enjoy working alongside people who work hard and genuinely care about each other. Fun environment that is continually challenging."
A/R Specialist
"Capstone truly cares about their employees/technicians. The office and upper management trust the technicians in the field 100%. I have full control of my schedule, there are NO dispatchers. Capstone wants to see your family life thrive as well as your career. It is an amazing company to work for and a wonderful community to be a part of. I will definitely be finishing my career at Capstone."
Service Technician
"Capstone is a great place to work. There is a real community among the employees, and management truly cares about all staff. Open communication between all team members is encouraged as the company is always looking to do better. Management is looking for team members willing to take initiative and invest in the growth of the company. In return the company invests in you."
Business Support Analyst
"Owners and management are sympathetic to family life and understanding life with kids. Overnights are voluntary and minimal. Growing company that allows employees to schedule and work at their own pace. Company provided and reimbursed uniforms/PPE."
Service Technician