Foundation Repair, Basement Waterproofing & Foundation Crack Repair in Boston, MA

Interior drainage is priced by the running foot of wall, so one wet wall costs a fraction of doing the whole perimeter. For a typical Boston basement most jobs land somewhere between about five and fifteen thousand dollars once a pit and pump are included. Old stone foundations often need pointing work before or alongside the drainage, and that shows up as its own line rather than hidden inside the waterproofing number. Access matters too, because on a city lot there is often no way to dig the outside of the wall at all.

Honestly, the gutters. A downspout emptying beside the wall delivers more water than most people believe, and redirecting it costs almost nothing. Grading the ground away from the building is next. Neither will fix a wall that water passes straight through, but both are worth doing first and we will tell you if that is all you need.

If you use the space or want to, yes, and it pays for itself the first wet spring. If it is bare storage that takes a little water twice a year, a sump and better gutters may be enough. We would rather say that than sell a full perimeter system to somebody who does not need one.

It is priced by the area of wall and how far the joints have gone. A single bad section runs in the hundreds; a whole cellar wall runs into the thousands. Old rubble takes longer than coursed stone because no two joints are the same. The one thing that reliably raises the price is leaving it, since once the joints are gone the stones start to move and then it is not pointing work any more.

The failed mortar is raked out to sound material, the joints are cleaned and damped, and new mortar is packed in and finished in layers rather than smeared across the face. It is slow work and it cannot be rushed, because mortar forced in too fast simply falls out again in a few winters.

A lime-based mortar, not modern Portland. This matters more than people expect. Portland is harder than the old brick and stone around it, so instead of the mortar wearing as the sacrificial part, the stone does. On a foundation this old the wrong mix quietly destroys the thing it was meant to protect, and it cannot be undone.

It is the more involved end of foundation work, so it runs well into five figures on most Boston houses. It is done in sections rather than all at once, and often only the failing part needs it. What makes it expensive is waiting, because a footing that keeps dropping takes the wall and the floors with it.

If the footing is still moving, yes, because everything above moves with it and the bill grows the whole time. If the settlement is historic and has not changed in years, no. The test we use is whether it has moved recently, not whether it looks alarming, and on a house this old plenty of alarming things stopped moving decades ago. Take a photograph with a ruler against the crack and look again in six months; that answers it better than any opinion.

No, and we will be blunt about this one. Underpinning means removing ground from beneath a wall holding your house up, in sections, in a set order, with the load carried at every stage. Get the sequence wrong and the wall comes down. It is permitted work here and it is not a job to learn on.

Cracks that are wider than they were, doors and windows that have started to catch, floors that slope or bounce, and water arriving where it never used to. One of those on its own is often nothing. Several at once, or any one of them changing over a season, is worth a look. The useful test is change over time rather than appearance on the day, because an old house has always looked a bit alarming.

In this city, longer than you would think. Plenty of Boston foundations are well over a century old and structurally fine. What has a shorter life is the mortar holding them together and, on made ground, the timber underneath. The stone is rarely the problem.

A single crack injected runs a few hundred dollars. Repointing a section runs into the low thousands. Underpinning or pile work runs well beyond that. Nobody can price it honestly over the phone, which is why somebody comes and looks first and the number goes in writing before any work starts.

Not as a rule. Insurers treat waterproofing as maintenance rather than damage, because the water arrived gradually rather than in one event. If a burst pipe flooded the basement, the damage from that may be claimable even though the waterproofing itself is not.

Usually not. Earth movement and gradual water are both standard exclusions and that covers most of what causes foundation trouble. Sudden accidental discharge is the covered path, so a supply line bursting under the slab has a real claim. Read your own policy rather than assuming.

No, and it is worth knowing before you need to. Pile rot is neither sudden nor accidental, it happens over years as the groundwater drops, so it falls outside every standard policy. Massachusetts has no state program covering it either. On a Back Bay or South End building that is a significant number to carry alone, which is exactly why the groundwater levels get monitored. If you own in one of those neighborhoods it is worth knowing your building's groundwater readings before you need them.

Yes, and it is more of the city than people realize. Back Bay was a tidal estuary until it was filled in the 1800s, and the South End and parts of Beacon Hill are made ground too. The buildings put up on that fill stand on untreated wooden piles. Underwater those last indefinitely. If the groundwater drops and the pile tops meet air, they rot, and the building settles. The City set up the Boston Groundwater Trust in 1986 to monitor exactly this.

Because it is lime mortar and it was always the sacrificial part. On an old fieldstone or rubble foundation the stone outlives everybody and the joints between the stones do not. Once they wash out the wall stops acting as one piece, and water walks straight through where the mortar used to be.

Sometimes, and it is a common ask here because so many old cellars have barely six feet of clearance. It means underpinning the walls first so the footings sit below the new floor, then excavating and pouring. It is real structural work rather than digging, and whether it is possible depends on the wall, the neighbors and what is under the slab. On an attached house the party wall usually decides it, so the conversation starts there rather than with the floor.