Business Details
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Expert Excavation & Septic Solutions in Marlborough, NH
David O'Neil Construction is a trusted excavation company serving Southern New Hampshire and the Monadnock Region. With over 20 years of industry experience, our team delivers safe, professional, and cost-effective solutions for residential and commercial projects. We specialize in excavation, septic system design and installation, drainage solutions, and driveway repairs, prioritizing quality workmanship and customer satisfaction. Our mission is to provide reliable construction services that meet the unique needs of every client, ensuring long-term value and peace of mind. 
Services
Excavation Services
Septic System Installation
Driveway Repairs
Drainage Solutions
Snow Plowing
Culvert Replacement
French Drains
House Lot Development
Trucking Services
Septic Inspections
Highlights and features
- Over 20 years of excavation and septic system expertise
- Licensed and insured for your protection
- Emergency services available for urgent needs
- Customized solutions for residential and commercial projects
- Proven track record of customer satisfaction
What people say
Top notch
Prompt and professional
Exceeded expectations
Honest and fair
Dependable service
Services
Excavation Services
We provide comprehensive excavation services for residential and commercial projects, including site preparation, foundation digging, and utility trenching. Our experienced team uses modern equipment to ensure precise grading and efficient earthmoving. Clients benefit from our expertise in preparing land for construction while maintaining safety and compliance standards.
Septic System Installation
Our septic system installations include design coordination with licensed soil scientists, proper material selection, and expert field placement. We ensure systems meet state regulations and environmental requirements. Homeowners receive detailed guidance on maintenance to maximize system longevity and performance.
Drainage Solutions
We install French drains, foundation drains, and surface drainage systems to prevent water damage to properties. Our solutions address basement flooding, yard pooling, and driveway erosion issues. Systems are built with durable materials for long-term effectiveness.
Driveway Repairs
We repair and maintain gravel, asphalt, and concrete driveways, addressing ruts, potholes, and drainage problems. Our team reinforces bases and reshapes surfaces for improved functionality and appearance. Regular maintenance extends driveway lifespan significantly.
Snow Plowing
We offer residential and commercial snow removal, plowing, and sanding services during winter months. Our team ensures safe access to properties through timely snow clearance and proactive ice management using environmentally-conscious materials.
People
David O'Neil
Owner
With over 20 years in excavation and 18 years in carpentry, David founded the company in the early 1990s. He oversees operations and brings extensive hands-on experience to every project.
Matthew O'Neil
Project Manager
Matthew manages septic installations and excavation projects, combining technical expertise with customer-focused service. He works directly with clients to ensure project goals are met efficiently.
Janelle Hodgman
Office Manager
Janelle handles administrative operations and client communications, providing organizational support that ensures smooth project execution and customer satisfaction.
Questions
What services does David David O'Neil Construction offer?
We specialize in excavation, septic system design/installation, drainage solutions, driveway repairs, snow plowing, and culvert replacement for residential and commercial clients.
Do you provide emergency excavation services?
Yes, we offer emergency services for urgent septic system failures and drainage issues requiring immediate attention.
How much does a septic system installation cost?
Septic system installations typically range from $20,000 to $30,000 depending on system complexity and site requirements.
What areas do you serve?
We primarily serve Southern New Hampshire and the Monadnock Region, including Marlborough and surrounding communities.
Are you licensed and insured?
Yes, we are a fully licensed and insured excavation contractor in New Hampshire.
Reviews (4)
Susan Scott
Sep 08, 2020
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What a great company to do business with! Everyone I spoke to, owner, staff or crew were friendly, helpful and pleasant. Right from the start they were very upfront about the extent of what needed to be done for our septic system. No sugar coating things and quoting a lower price, only to have to raise it later! Their honesty and integrity was very appreciated. They did the work with professionalism and quality. Buying a septic system is never fun, but if you have to do it, O"Neil Construction will do it right the first time.
Bart Cushing
Oct 03, 2019
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They do good work, do not mess around. Our crews always like it when we are on a job together, the men and equipment show up on time and are prompt. Customers happy with the work and the pricing. Highly recommend.
Brad Grinstead
Jun 16, 2018
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They are almost too good to be true. Honest, fair, and dependable. Dont waste your time (and money) on other contractors for your septic/leach field needs, or for all of the other services they provide.
Mike Kapiloff
Dec 22, 2017
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I had pipe issues at a rental property and o'Neil construction got right out there, gave me a quote and did the work slightly under the quoted price. They even cleaned up their mess.
