Site Work 101: Excavation & Site Prep for NH Building Lots
Every building project in New Hampshire starts the same way: with dirt, and usually with rock. Before a single form is set or a footing poured, the land has to be cleared, shaped, drained and made ready — and how well that invisible work is done determines how everything on top of it behaves for the next fifty years. That phase is site work, and it’s the part of construction we’ve built our reputation on.
Here’s what site work actually includes, the order it should happen in, and the New Hampshire-specific realities — ledge, water, mud season — that separate a smooth project from an expensive education.
What “site work” actually covers
Site work is everything that turns a raw or under-prepared lot into a build-ready one: clearing and grubbing, excavation, grading, drainage, utility trenching, driveway construction, and the backfill and finish grading that close the project out. On a typical residential build it’s the first trade on site and one of the last to leave.
The right order of operations
1. Know before you dig
Survey and lot lines confirmed, utilities marked (Dig Safe before any excavation — always), town requirements checked, and test pits dug where soil, water or ledge is a question. An hour of test pits routinely saves five figures of surprise.
2. Clearing and grubbing
Trees, stumps and roots come out of the building envelope, driveway corridor and septic area. We’ve covered this phase in depth in our land clearing for construction guide — the short version is that stumps and organic material can never stay under anything structural.
3. Strip and stockpile the loam
Topsoil is too valuable to bury and too weak to build on. It gets stripped from work areas and stockpiled on site for finish grading later — a small discipline that pays for itself when it’s time to make a lawn.
4. Excavation and rough grading
The big shaping: cutting the foundation hole, establishing subgrades for the driveway and slabs, and moving material to balance the site. This is where ledge announces itself if the test pits didn’t already find it.
5. Drainage
Water management gets built in now, not bolted on later: footing drain provisions, curtain drains where slopes send water at the building, culverts, and grading that moves surface water away from everything you’re about to build. In our experience, the majority of “foundation problems” homeowners describe are actually drainage problems that were never addressed at this stage.
6. Utility trenching
Water, power, communications and septic lines go in while the site is open and the machine is on site — trenching costs a fraction now versus after the driveway and lawn exist.
7. Foundation handoff, backfill and finish grade
The site hands off to the foundation work (in our case, to our own crew), then the excavation equipment returns to backfill, spread that stockpiled loam, and cut the final grades that keep water moving away from the building for good.
New Hampshire realities to budget for
- Ledge: bedrock near the surface is routine in our part of the state. Most of it is removed by hydraulic hammering; large volumes of hard rock occasionally justify blasting. Either way, discovering it in test pits beats discovering it under a half-excavated foundation hole.
- Water: high water tables and spring-wet soils shape when we dig and what drainage the site needs. Sometimes the cheapest fix is simply scheduling the excavation for the right season.
- Mud season: there’s a window in early spring when frost is coming out of the ground and heavy equipment does more damage than progress. Good contractors schedule around it; impatient ones leave ruts you’ll be regrading for years.
- Erosion control: silt fence, stabilized construction entrances and sensible sequencing keep soil on your lot and off your neighbor’s — and keep your project on the right side of town and state requirements.
- Town rules: driveway and curb-cut permits, wetland setbacks and local grading requirements vary town by town across our service area. We check before the first machine rolls.
What moves site-work cost
The honest answer: the stuff you can’t see from the road. Ledge quantity, water management, slope (flat lots are cheap; hillsides aren’t), access for equipment and trucks, haul distance for material coming in or going out, and how much of the lot needs touching at all. Two one-acre lots on the same street can carry very different site-work numbers — which is why we price from a site walk and test pits, not from an aerial photo.
Why one crew for site work and foundation pays off
On most projects, the excavator and the foundation contractor are two companies with two schedules and, when something goes wrong, two directions to point fingers. We do both — the same company digs the hole, handles the ledge, pours the foundation, and backfills against its own walls. One schedule, one quote, one number to call, and nobody to blame but ourselves — which is exactly how we like it.
Getting a lot ready to build in central or southern New Hampshire? Call N.C. Bratko Construction at (866) 927-2856 for a free site walk and an itemized site-work estimate.
Frequently asked questions
How long does site prep take?
A straightforward lot: often one to three weeks of active work for clearing through rough grade. Ledge, water, weather and permit timing are the variables — we’ll give you a realistic calendar after walking the site.
What happens if you hit ledge?
We hammer it — our excavators run hydraulic breakers, and dealing with ledge is a normal week for us, not a crisis. Test pits beforehand mean the quote already reflects it far more often than not.
Do I need a survey before site work?
If there’s any doubt about lot lines, setbacks or easements — yes, and it’s cheap insurance. Building anything in the wrong place is the most expensive mistake on this entire page.
Can you prep the site but let another contractor build?
Of course. We do site-work-only packages for owners and builders regularly — though once you’ve watched the same crew handle the dirt and the concrete, the one-crew advantage tends to sell itself.
