Septic System Installation: Licensed Septic Installers Based in Londonderry, NH

16 of the 25 licensed listings based in Londonderry hold a license class that covers this work: they are licensed to build and install septic tanks and drainfields, and repair or replace failed ones. Not every well and septic professional is; see all Londonderry listings for the full roster.

People also call this septic tank installation, septic system replacement or drainfield repair. It is the same work, done under the same license class.

"Based in" is the city on the business's license record. That can be a mailing address; it doesn't tell you where the business works.

Looking for a specific contractor? Search by name, business name, or license number.

What does septic system installation cost?

A conventional septic system typically costs $3,600 to $12,500 installed. Alternative systems (aerobic, mound) for difficult sites run $10,000 to $20,000. Soil conditions drive most of the difference, which is why a soil or percolation test comes first.

Those are national ranges. The Septic System Installation cost guide explains what moves the price, and local quotes set the real number.

Before you hire

Before you sign anything: confirm the license on this page is still active with the agency that issued it, ask for proof of insurance, and get at least three written quotes; pricing on this work varies widely by site conditions.

Do I need a permit for well or septic work in New Hampshire?

Related guides: 7 Signs Your Drain Field Is Failing · Aerobic Septic Systems: How They Work, What They Cost, and What They Need · How to Choose a Septic Company: 9 Checks Before You Sign

Need someone in another town? The New Hampshire page lists licensed contractors across the state by county and city.

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