David O'Neil Construction LLC

07/24/2026

Another septic system successfully brought back to life!

When a septic system reaches the end of its service life, the best long-term solution is a new replacement system —not just another repair. On this project, our crew removed a failed EnviroSeptic system and installed a brand-new conventional stone and pipe leach field, designed to provide the homeowner with years of dependable performance.

The project included:
✔️ Excavation and removal of the existing failed EnviroSeptic system
✔️ Careful site preparation of the new leach field area
✔️ Installation of new distribution piping and distribution box
✔️ Placement of washed stone and a new stone & pipe absorption system
✔️ Final grading and restoration of the property

Every septic installation starts with proper excavation and precise elevations. Taking the time to build the system correctly ensures even wastewater distribution, proper drainage, and a longer-lasting septic system.

Whether your current septic system is failing or you’re building a new home, David O’Neil Construction has the experience and equipment to handle your project from start to finish.

📍 Proudly serving Cheshire County and the Peterborough area.

📞 Call our office today at 603-876-9000 to discuss your septic replacement or new installation project.

07/22/2026

Driveway Season is in Full Swing! 🚜

We’ve been busy completing several driveway projects, and one thing never changes—a great driveway starts with a great foundation.

At David O’Neil Construction, we believe the key to a long-lasting driveway is building a solid, properly compacted gravel base before applying the final surface. A strong base provides proper drainage, reduces settling, and helps prevent ruts and potholes over time.

One of our most popular finishing options is asphalt grindings (millings). Asphalt grindings offer several great benefits:
✔️ Cost-effective compared to new asphalt
✔️ Creates a durable, hard-packed driving surface
✔️ Helps reduce dust and loose gravel
✔️ Holds up well to everyday traffic
✔️ Recycles existing asphalt, making it an environmentally friendly option
✔️ With proper compaction and time in the sun, it binds together to create a smooth, low-maintenance surface

Whether you’re replacing an old driveway or building a new one, taking the time to install the right base makes all the difference in how your driveway performs for years to come.

If your driveway needs an upgrade, we’d be happy to provide an estimate.

📞 603-876-9000
📍 423 Main Street, Marlborough, NH

Quality work from the ground up—that’s the David O’Neil Construction difference.

07/04/2026

06/12/2026

Anyone in Stoddard area looking for fill? We are in need of a location to dump. PM or call the office at 603-876-9000.

04/21/2026

Our recent septic install & parking area ➡️ satisfied customer & ⭐️⭐️⭐️⭐️⭐️ review! If you or someone you know is looking for a knowledgeable, professional & reliable excavation crew for your next project, we are your company! And thank you Mark, it was a pleasure working with you!

04/20/2026

Big progress on this house lot project in Nelson, NH! 🚧

Our crew has been hard at work digging and prepping the site for the foundation—carefully excavating, grading, and setting the stage for concrete basement walls. Precision is everything at this stage, and we’re making sure the base is solid and ready for the next phase.

From raw land to a future home; it’s always great to see a project start taking shape.

Need site work or excavation for your next build? Reach out—we’d be glad to help get your project off to the right start.

04/15/2026

Aging sewer infrastructure is a common concern for many homeowners, especially those with older clay or Orangeburg piping. While these materials were once standard, they are now prone to cracking, root intrusion, and eventual collapse—leading to costly repairs and potential property damage.

Upgrading to SDR 35 piping provides a durable, long-lasting solution designed to improve flow efficiency and resist common issues associated with outdated systems. Investing in a replacement not only protects your home but also adds long-term value and peace of mind.

If you’re noticing slow drains, frequent backups, or suspect your sewer line may be failing, it’s important to act early.

David O’Neil Construction proudly services the entire Cheshire County and Peterborough areas.

Contact the office of David O’Neil Construction at 603-876-9000 to discuss needed repairs, or full replacement. Our team is here to help ensure your system is functioning efficiently.

04/13/2026

Another successful project in the books!

David O’Neil Construction recently completed the installation of a Presby Advanced Enviro-Septic system for a commercial customer in Swanzey, NH. Our team worked efficiently to ensure the system was installed to the highest standards, providing a reliable and environmentally friendly solution.

In addition to the septic installation, our crew extended the customer’s parking area and finished the gravel driveway, helping improve both functionality and accessibility for their property. We also replaced the old copper waterline with new CTS piping to help prevent future leaks and ensure long-term reliability.

Great work by our crew from start to finish—we’re proud to deliver quality results that our customers can depend on!

If you’re planning a project, big or small, reach out to see how we can help.

📞 603-876-9000