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Question DetailsAsked on 11/29/2015

How much should I anticipate spending to dig out 2' from a basement that's approximately 900 sq ft of existing home

I going to be purchasing a semi detached corner unit home in DC that was built in 1923 and has about 900 square feet of basement that current has about 6'7 ceilings. I would like to dig out the 1 foot to 2 feet of the basement floor to achieve ceiling heights of around 7'6" to 8'6' to make to the basement a usable dwelling unit. What are some of the concerns I should have with doing this work (such as settling or moving of sanitary drain pipes) and how much should I expect to pay for doing all of this work?

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Depends a lot on your specific house foundation and its current condition, and on whether watear and especially sewer lines (which have to maintain certain grades) have to be or can easily be moved, and of course on soil conditions if very hard digging or bedorck, or if soil is very wet or soft so stability is a major concern.

One other solution being used more often these days, depending on surface grades and whether you dislike stairs to the front door and on whether your garage is attached/detached or tuck-iunder (which makes it more difficult) is jacking the house up and building stub-walls on top of the existing foundation (assuming it is in good condition) then setting the house back on top of that and reconnecting utilities - can be cheaper at times than digging out and deepening the foundation under the house.

Generally, having an Architect/Engineer firm look at it and assess the issues and alternatives first is worth the cost for that.

Here are a number of similar questions with answers - those and some others are linked below the various responses:

Answered 4 years ago by LCD

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