Your Trusted Local Excavation Experts Three Generations Strong
Your trusted excavation partner serving Southern New Hampshire and Northern Massachusetts.
RESIDENTIAL
COMMERCIAL
MUNICIPAL & DOT
DEVELOPERS
Fully insured
Bonding capacity available upon request
Safety-first program
Our Excavation Services
JG Gagnon & Sons delivers expert excavation and site work services across Southern NH and Northern MA from
foundations and septic systems to full site development for commercial, residential, and municipal projects.
Site Development
Full site prep for house lots, subdivisions, and land development from clearing to final grading.
Foundations & Utilities
Expert excavation for foundations, water and sewer connections, and complete drainage solutions.
Septic & Systems
Licensed installation and repair of septic systems, including advanced and alternative designs.
Commercial Projects
Comprehensive commercial site work building pads, underground utilities, and road preparation.
Demolition & Removal
Safe and efficient demolition, including building removal, stumps, and underground tanks.
Equipment & Operators
Modern equipment with skilled operators available for hire on residential, commercial projects.
Ready to break ground?
Building New England from the Ground Up
Before
After
Exeter subdivision
site prep
Before
After
Drainage & utility
tie-ins – Salem, NH
Before
After
Drainage & utility
tie-ins – Salem, NH
See What We’ve Built
About us
Family-Owned. Locally Trusted.”
For over three generations, J.G. Gagnon & Sons has been serving New England with reliable, top-quality excavation and site development. From residential lots to large-scale commercial projects, we bring the equipment, expertise, and work ethic to get the job done right — on time, every time.
Trusted by Homeowners,
Contractors & Municipalities
We’re proud to earn the trust of homeowners, builders, and municipalities
across Southern NH & Northern MA
General Contractor
“JG Gagnon consistently delivers site work on time and with precision. Their crews are dependable, and their attention to safety is unmatched.”
Local GC, Seacoast NH
Homeowner
“They handled our septic system replacement with professionalism from start to finish. The crew was respectful of our property and kept us informed every step.”
Homeowner, Exeter NH
Municipality
“From road prep to drainage solutions, JG Gagnon has been a reliable partner for our town projects. Their ability to manage large-scale work sets them apart.”
Town Engineer, Southern NH
Ready to Break Ground?
Contact J.G Gagnon & Sons Excavation today for a free quote or to discuss your upcoming project needs.