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I have an unfinished cellar in Park Slope and am ready to start looking soon for architects/contractors. Before I do this, I would really like to have some idea of what I am talking about vis-a-vis what I want to do, and this will depend on cost (I have a feeling some of my ideas will cost more than I am prepared to spend).

So here are my questions: Does anyone have a ballpark/rule of thumb way to estimate excavation costs (e.g. $ per cubic foot?), as well as the cost of underpinning party walls ($ per vertical and/or horizontal foot?) as well as for pouring new concrete slab?

The house is brick all around, 35 ft long by 19.5 wide.

Much obliged, Brownstoner people!!