Call us now and we'll work to schedule a technician the same day, across every trade we handle.
Book A ServiceGenerator Services in Salem, NH
Residential & Commercial Backup Power, Installation & Maintenance
When a nor’easter rolls through Rockingham County or a summer storm knocks out the grid, the systems that matter most, including heating, refrigeration, sump pumps, medical equipment, and security, can stop along with it. Cornerstone Services provides generator installation, maintenance, and electrical support for homes and businesses across southern New Hampshire and northern Massachusetts. Our electrical team handles the full scope: the generator, the transfer switch, the panel work, all of it. One call does it all.
Ready to protect your home or business with reliable backup power? Call (603) 874-1402 to schedule same-day or next-available service.
What Our Generator Services Include
Our Salem, NH generator services cover installation, maintenance, and the supporting electrical work that keeps your backup power system running the way it should from day one.
Standby Generator Installation
A standby generator connects directly to your electrical panel through an automatic transfer switch, a device that detects an outage and restores power within seconds, without any manual intervention. Sizing that system correctly means calculating the total electrical load of the circuits you need to keep running. Our electricians assess your property, determine the right capacity, and handle the installation from the ground up.
Electrical Panel & Transfer Switch Work
Before any generator goes in, we evaluate your existing panel. If the panel can’t handle the added load, we upgrade it as part of the same job. Transfer switch installation is included in the scope, wired and integrated by the same team, under the same workmanship warranty.
Generator Maintenance
Standby generators should be serviced every 6 to 12 months or after 200 hours of use. Our maintenance visits cover oil and filter changes, battery inspection, load testing, spark plug checks, air filter replacement, and coolant system review. We also advise on any repairs or component upgrades needed to extend the system’s lifespan.
Transparent Pricing & a Signed Warranty on Every Job
Generator installation is a significant investment. The two things that tend to cause friction, surprise costs at the end of a job and uncertainty about whether the work is covered under warranty, are addressed before we start. We price by the job, not the hour. The number we quote you is the number you pay at completion, with no hourly overruns or hidden fees.
Every job we complete is backed by a signed workmanship warranty under our quality assurance policy. That documentation stays with you after the work is done. Same-day scheduling is available when you can’t wait. Every worker we send has passed a background check, and our technicians clean up completely before they leave.
More than 1,250 five-star reviews across Google, HomeAdvisor, Facebook, and Yelp reflect the kind of experience customers actually have, and financing options are available if you’d like to discuss payment terms when you schedule.
One Provider for the Generator & Everything Around It
Generator installation rarely happens in isolation. The job frequently surfaces related needs: a panel that needs upgrading, transfer switch wiring, or circuit work that has to be done correctly for the system to operate safely. When those needs show up on a job where two separate contractors are involved, you’re left coordinating schedules and reconciling whose scope covers what.
At Cornerstone Services, electrical, plumbing, heating, air conditioning, cleaning, and handyman services all run through the same team, under the same warranty and pricing structure. Whatever surfaces during a generator installation, electrical panel work, HVAC coordination, or anything else, we handle it. You make one call, and we sort out the rest.
Our home modifications division also works alongside our electrical team for clients who need smart home setup, backup power integration, or accessibility modifications. It’s a service combination available under one roof in the Salem area.
Frequently Asked Questions
How Long Does Generator Installation Take?
Most residential installations take one to two days. The timeline depends on the size of the unit, site conditions, and whether panel work is required as part of the job.
Will My Existing Electrical Panel Need to Be Upgraded?
Not always, but we assess it before installation. If your current panel can’t handle the generator load safely, we’ll include the upgrade in the project scope and quote it upfront, with no surprises at the end.
Does a Standby Generator Increase My Monthly Electric Bill?
No. A standby generator only activates during a power outage. During normal operation, it stays dormant, so it doesn’t draw from your utility and won’t affect your regular bill.
Can I Install a Generator Myself?
Generator installation involves transfer switch wiring, panel connections, and compliance with local building codes. In New Hampshire, a licensed electrician is generally required to perform this work. This isn’t a project where DIY saves money. It’s one where mistakes create serious risk.
What If I Need Service Outside Normal Business Hours?
Call (603) 874-1402 anytime.
Schedule Generator Services in Salem, NH
Whether you’re installing a new standby system, catching up on maintenance, or dealing with a generator that isn’t performing, Cornerstone Services is ready to help. Same-day scheduling is available, and financing options are on the table. Ask about current terms and monthly promotions when you call.
Call (603) 874-1402 now to schedule.
The Cornerstone Difference: Built on Trust. Backed by Service.
The service standards behind the thousands of positive experiences our customers share year after year.
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Flat-Rate Pricing
The price you're quoted before the job begins is the price you pay at completion, no hourly adjustments, no surprise charges.
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On-Time Arrival
Service vehicles are staged at multiple locations so we show up when we say we will, not hours after your window closes.
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Signed Workmanship Warranty
Every job comes with a signed warranty under our quality assurance policy. You get a written record of what the work covers.
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Background-Checked Workers
Every technician passes a background check before they step onto your property, regardless of the trade or type of job.
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Same-Day Scheduling
Call us and we'll work to get a technician out the same day. Our on-call staff is available 24 hours a day, every day of the week.
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Clean Job Sites
Your home or business will be left clean when we're done. Technicians are responsible for cleaning up after every job, no exceptions.
1,250+ Five-Star Reviews & Counting
We let our work speak for itself. From quick repairs to major installs, our customers say it best.
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Paul Quinn did electrical work for me and he was the best!Nicola Sullivan
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Michael with Cornerstone Services was excellent to work with.Jamie Fasbender
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He was very professional and explained all that he was doing.Mary Duford
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Showed up as agreed and was very informative.John Cote
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Fast response and very professional.Anne Butterworth
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On time. Thorough. Kind. Positive attitude in this awful heat.N N
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Cornerstone came promptly and fixed them.Marilyn Frank
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He and his partner PJ worked quickly and efficiently to solve a dryer vent issue we had been experiencing.Pierre Thelusma
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Took care of our electrical needs with ease!Peter Larocque
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He was quick, thorough, professional, and made sure everything was done right.Jess Nichol
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10/10 experience and so happy we got in touch with him and this company!Anthony Capozzi
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They were so neat, you would never know there was a problem.Bill Mullen
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Paul is always friendly, polite, and professional.Cindy Marcin
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Paul was efficient and expert at correcting the problem and ensuring all was well.Woodrow Cook
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He went above and beyond for me when some unforeseen issues arose with my bathtub install.Susan Hevey
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Tech was on time, friendly, and competent.Vincent JJ Balukonis
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He was very thorough and quickly corrected the issue.Gary Chisholm
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Josh was very prompt with his services and explained things clearly.Kim Mcanany
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Arnold is a pleasure to work with.Esther Bradbury
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Jason is always great and knowledgeable and friendly.Mark Duell