BWP & Sons Excavation will get the job done right, the first time! Complete septic sytem design and installation, foundation excavation of home additions & garages in New Hampshire. We Can Handle All Types of Septic Services, Excavation and Demolition Services NH. Land reclamation, forestry mulching & brush clearing, surface & foundation drainage, driveway & parking lot construction/grading to utility trenching, Demo both small & large. When you're looking for an excavation company, you'll want to go for a company that is large enough to handle all your needs and small enough to offer highly customized services that are reasonably priced. At BWP & Sons Excavation, we have a fleet of equipment all kinds of jobs - big or small.