Foundation & Basement Excavation in Buffalo, NY

Foundation and basement excavation is the dig for a new home's basement or crawl space, the footings for an addition or garage, and the backfill once the walls are in. In the Buffalo area, two things decide how the job goes: frost, which sets how deep footings must be, and clay, which decides how the hole behaves and how the backfill settles.

Frost depth

With January averaging 25.5 degrees and long stretches below freezing, footings must sit below the local frost depth set by the building code and your town's building department. Shallow footings heave. We dig to the depth on the approved plans.

Clay and groundwater

Clay soils stand well in a cut when dry but slump when wet, and they drain slowly. On the old Lake Tonawanda bed north of the city, parts of Amherst have had collapsing foundations tied to unstable soil. Where that history exists, a soil evaluation before design is worth it. In low areas near creeks, groundwater can fill a basement hole overnight, and pumping becomes part of the job.

Additions and garages

Additions beside older Buffalo homes mean digging next to foundations of stone, block or brick, sometimes on shallow footings. We dig in sections where needed and backfill promptly so the old wall stays supported.

Backfill

Backfill against new walls goes in after they cure and after waterproofing and footing drains are installed. Clay is not ideal backfill; where specified we use free-draining material against the wall and compact the rest in lifts. Poor backfill is the reason so many stoops, walks and patios beside newer houses sink within a few winters.

Costs

HomeBlue's Buffalo estimates put a new-home basement dig at about $3,700 to $6,400, roughly two and a half days of machine time in normal soil. HomeGuide's national figures for a full basement project, which include more of the work, run $10,000 to $30,000 depending on depth.

Permits

New foundations need a building permit, and footings are usually inspected before concrete. We coordinate the dig with your builder and inspector.

Spoil on small lots

A basement produces a lot of soil, and city and inner-suburb lots have little room to stockpile it. We plan how much stays for backfill and how much is hauled immediately, so the lot stays usable during construction.