Commercial Site Work
Site packages for builders, developers and property owners, ready for the next trade.
- Mass excavation
- Utility trenching
- Stormwater & drainage
- Parking lot subgrade
Mike Terwilliger on the job · from the family archive
Site Work & Septic Contractor · Bristol, CT
Site work & septic in Connecticut, done right since 1976.
Commercial and residential site work, septic systems, land clearing and grading. One family, our own equipment, and no job too small or too big.
50+Years
Est. 1976Family owned
Licensed& insured
What we do
Site work & septic services
We run our own machines and crews, so one call covers the whole job from clearing the lot to the final grade.
Residential Site Work
New house lots, additions, garages and pools. We prep it, dig it and clean it up.
- Foundation excavation
- Driveways
- Water & sewer lines
- Backfill
Septic Systems
New systems, repairs and full replacements, built to the approved plan.
- New installations
- Repairs & replacements
- Leaching fields
- Tanks & D-boxes
Land Clearing
Wooded or overgrown land turned into a usable, buildable site.
- Tree & brush removal
- Stumps
- Rock & boulders
- Lot clearing
Grading
Grades that move water away from your house and off your driveway.
- Rough grading
- Finish grading
- Yard drainage
- Topsoil & seed prep
If it's in the ground
Not on the list? Ask. If it takes a machine and the ground, chances are we've done it.
- Excavation
- Demolition
- Retaining walls
- Small jobs welcome
No job too small.
No job too big.
A single drainage fix or a full commercial site. Same family, same standard, same answer when you call.
Who we work with
Two ways in
Homeowners and contractors need different things from a site contractor. Here's what each gets.
Homeowners
Building, adding on, or fixing a septic or water problem? We walk the property with you and explain the work in plain terms.
- Free on-site estimate
- Help with town and health department steps
- Clean site when we leave
Builders & GCs
Need a reliable site sub? Send plans and specs and we'll return a clear number and a schedule we keep.
- Bids from plans & specs
- Our own equipment, our own crews
- Certificate of insurance on request
Septic systems
How a new septic job goes
In Connecticut, septic work runs through your local health department. Here's the path from first call to final approval.
Site visit
We look at the property, the existing system and access for equipment.
Soil testing
Deep test pits and perc tests, witnessed by the health department.
Design & permit
An engineered plan is approved and a permit to construct is issued.
Installation
Tank, distribution box and leaching system built to the approved plan.
Inspection
The health department inspects before backfill. Then we grade and clean up.
Every town handles scheduling a little differently. We'll tell you what to expect for yours.
Recent work
Our work
From house lots to full commercial sites. Swap in photos of your own crews and machines any time.
Why Terwilliger
What you can count on
A Terwilliger answers
You talk to one of the brothers who run the company, not a call center.
Our own machines
We don't wait on rentals or subs to start your job.
Straight pricing
A written estimate you can understand, before work starts.
We clean up
Raked, graded and seeded where needed. We leave it better.
Mike's sons, back to work.
My father, Mike Terwilliger, started Terwilliger Construction in 1976 and built it from the ground up. He was always honest, above board and fair with every customer, and that's what the Terwilliger name came to mean across Connecticut.
Now my brothers and I are bringing it back. Same name, same family, same way of doing business. When you call, you talk to one of Mike's sons, and you get a straight answer and a fair price.
- Founded
- 1976 by Mike Terwilliger
- Experience
- 50+ years
- Ownership
- Family owned & operated by the Terwilliger brothers
- Licensing
- Licensed & insured
- Home base
- Bristol, Connecticut
- Coverage
- Crews working all over Connecticut
From the archive
From Mike's early years running Terwilliger Construction.
Service area
Where we work
Based in Bristol with crews working all over Connecticut, from Fairfield County to the Quiet Corner. Residential and commercial, every county in the state.
Hartford Co.Litchfield Co.New Haven Co.Fairfield Co.Middlesex Co.New London Co.Tolland Co.Windham Co.
Common questions
FAQ
Do you take small jobs?
Yes. A single trench, a drainage problem or one stump is worth a call. No job too small.
Are estimates free?
Yes. We come out, look at the site and give you a written price.
How do I know my septic is failing?
Common signs are slow drains, sewage odors, soggy or bright green patches over the leaching field, and backups after heavy use. Call us and we'll take a look.
Do you handle permits?
We work with your town and health department through soil testing, design approval and inspection, and tell you what you need at each step.
Do you work for contractors?
Yes. Send plans and specs and we'll bid the site work. Certificates of insurance are available on request.
Free estimates
Tell us about your job.
Fill out the form or call. We'll get back to you within one business day to set up a site visit.
- Phone
- 860-484-9846
- Hours
- Mon–Fri, 7:00 am – 5:00 pm
- Location
- Bristol, CT · Crews across Connecticut