Foundation excavation for a new home costs $1,500 to $10,000 on average and a basement dig $10,000 to $30,000, by HomeGuide's national 2026 figures. In Baltimore, shared walls and old foundations make careful digging the main skill.
The costs shown here are national ranges that HomeGuide publishes, not our own prices. In Baltimore, boulders, groundwater, alley access and haul distance are what really set a job's cost. Figures checked October 2026.
What does foundation excavation cost for a new house in Baltimore?
Foundation excavation for a new house costs $1,500 to $10,000 nationally, and can pass $20,000 in rock or boulders, per HomeGuide. That is only the dig. An unfinished basement foundation is $70,000 to $100,000 and a slab $12,000 to $28,000 for 2,000 square feet.
What does basement excavation cost?
Basement excavation for new construction costs $10,000 to $30,000 by HomeGuide's basement section, typically over 2 to 4 days; rocky or hard-access sites run $30,000 to $50,000 or more. The page's project table shows less, but the basement section applies. It is excavation only.
Can you dig out a crawl space or make a basement deeper in Baltimore?
Yes, but it is structural work. HomeGuide puts a new basement under an existing crawl space house at $20,000 to $45,000 or more for excavation alone. Lowering a rowhouse basement means underpinning the party walls, with an engineer's plan, a permit and the neighbors' cooperation.
What does it cost to dig around an existing foundation in Baltimore?
To dig around an existing foundation costs $5,000 to $15,000, or $100 to $250 per linear foot, per HomeGuide. Basement waterproofing itself is $6,000 to $18,000. On rowhouses, often only the rear wall is reachable from outside.
How far from the wall do you dig?
We dig as far from the wall as the crew needs, usually two to three feet at the bottom, sloped or shored above. Below about five feet, the trench is protected so it cannot cave in, which matters in Coastal Plain sand.
Can you dig next to a rowhouse foundation without damaging it?
Yes, if it is done in sections. We expose short lengths of wall, hand dig close in, never go below the footing and backfill each part before opening the next. Old stone and brick foundations get extra care.
How deep do footings go in Baltimore?
Footings must sit below the frost depth set by the building code that the city or county enforces, and the plans set the exact figure. We dig to the plans and the inspector checks before the pour. Additions must tie into the old footing as drawn.
What does backfill around a new foundation cost in Baltimore?
Backfill is usually part of the dig price. If more is needed, HomeGuide's national count puts delivered backfill at $5 to $25 per cubic yard. Against a basement wall we use drain stone or another free-draining fill in layers.
A neighbor's dig went in, and now my foundation has a crack. Who is responsible?
Whether the neighbor's dig caused a crack is a question for an engineer, and the answer decides who pays. Photograph and measure it at once, with dates, and tell the neighbor and their contractor in writing. Old rowhouses often have existing cracks, so before photos matter. This is general information, not legal advice.
What does a walkout basement door cost?
HomeGuide gives no single figure for a walkout. The dig is like excavating around a foundation, $100 to $250 per linear foot, plus cutting the wall and a stairwell or walls, which an engineer designs. Sloped Piedmont lots suit walkouts best.
Want to know what your job will cost? Call or text (410) 873-7935. We visit the site and then write up the scope and price.