Foundation Repair & Waterproofing FAQs — Brooklyn, NY

These are the questions Brooklyn Foundation Pros hears most from New York City homeowners and property managers about foundation repair and basement waterproofing — pricing, permits, timelines, and how the work actually goes. Short answers here; the linked service and cost pages go deeper. If your question isn't covered, call (347) 620-1227 and ask us directly.

How much does foundation repair cost in NYC?

It depends entirely on the fix: a single crack injection often runs $500–$1,200, a sump pump installation $1,500–$3,500, interior waterproofing $6,000–$18,000 for a typical basement, and underpinning $1,500–$3,000 per pin. NYC labor and access push prices above national averages. Your quote is fixed in writing after a free inspection — no per-foot surprises halfway through the job.

Is a foundation crack serious?

Some are, most aren't. Hairline vertical cracks in poured concrete are usually shrinkage and cosmetic. Horizontal cracks, stair-step cracks in block walls, cracks wider than a quarter inch, or any crack that is growing or leaking deserve a professional look — those can signal pressure or movement. We inspect free and tell you which kind you have, with photos.

Interior or exterior waterproofing — which is better?

Exterior excavation waterproofing stops water before it enters the wall and is the gold standard when the outside of the wall is accessible. Interior systems manage water that gets in, channeling it to a sump pump, and are far less disruptive and expensive — the right call for most finished basements and attached Brooklyn homes where the exterior simply cannot be dug. We quote the method your house can actually take.

Why is my basement wet only in spring or after heavy rain?

That pattern points to a rising water table or surface water finding one entry path — a floor-wall joint, a window well, a single crack. Seasonal water is usually fixable with a targeted repair or a sump system rather than a full perimeter job. The inspection includes checking gutters, grading, and window wells first, because sometimes the fix is above ground and cheap.

What does underpinning involve, and how long does it take?

Underpinning deepens or strengthens your foundation in sequenced sections called pins, dug and poured one at a time so the building is always supported. A typical Brooklyn rowhouse takes two to six weeks depending on pin count and inspections. It is the correct fix for settling and for basement dig-outs, and it is engineered work — permits and your engineer's drawings govern the sequence.

Do you guarantee the work?

Waterproofing systems and structural repairs carry written warranties, and the terms — what is covered, for how long, and what voids it — are in your quote before you sign, not in fine print after. If water finds a new path in a warrantied area, we come back and fix it.

Want the full menu of what we do? See our foundation repair and basement waterproofing services page, and check the service area page to confirm we cover your neighborhood.