A lally column inspection is one of the most common home inspection issues on older homes across Greater Boston, and it can hold up a sale fast if nobody catches it early. Home inspectors check these columns on almost every basement walkthrough, and it does not take much to get one flagged: rust, a hollow steel post, a section made of wood, or even a stack of old bricks doing a steel column's job. None of that means your house is falling down. It usually means a fix is needed before closing, and buyers, sellers, and lenders all want to see it done right.
Here at A-1 Foundation Crack Repair we do lally column repair in Boston and the surrounding region, and we've replaced thousands of lally columns across Massachusetts, Rhode Island, New Hampshire, and Connecticut. We know exactly what inspectors are trained to look for and what it takes to pass the second time around.
What Is a Lally Column?
A lally column is a vertical steel or concrete post in your basement that carries the weight of the main beam above and transfers that load down into the foundation. The name comes from John Lally, a Waltham and Boston-area contractor who patented the concrete-filled steel column in the early 1900s. 'Lally column' has since become the generic term. New Englanders use almost any steel basement support post, which is part of the problem: the term gets used for true fixed columns and for temporary screw jacks alike, and a lally column inspection checks those two very differently.
What a Lally Column Inspector Looks For
When it comes to a lally column inspection, home inspectors are trained to look for the same handful of red flags on almost every visit:
1. Rust on steel columns. Steel touching damp concrete or soil stays wet, and wet steel rusts. Building code requires a rust-inhibitive coating inside and out for exactly this reason, so inspectors are checking for coating failure and active corrosion, not just surface discoloration.
2. Splits or cracks in the column itself, however small.
3. The wrong column type for a permanent support. This is the one that trips people up: a hollow column is not automatically a problem, since adjustable steel columns are hollow by design. The real red flag is a two-piece, screw-adjustable column doing a one-piece solid column's job. InterNACHI and other inspection standards only recognize one-piece solid columns, at least 3 inches in diameter, as approved for full-time structural support.
4. Wood posts or tree trunks used as columns. This was common decades ago and still shows up in older homes, but it has never met code as a permanent basement support.
5. Stacked brick or stone columns, especially in older homes where the mortar has started to crumble and the masonry is no longer carrying real weight.
6. A top or bottom plate that is missing or not securely fastened. There should be a plate connecting the column to the beam above and the footing below, and if it is missing or loose, the column may not be doing its job at all.
7. More than a few inches of exposed adjustment screw on a jack-style column. Once a column is set at its final height, only a short length of thread should still show; several inches of exposed thread usually means the column is near the end of its adjustment range and under more strain than it was designed for.
That third point trips up more homeowners than any other. A permanent, one-piece column and a temporary, screw-adjustable one can look similar from a few feet away, but they are not interchangeable, which is why the American Society of Home Inspectors trains its members to check the column type first, before anything else on this list.
Why Lally Columns Fail in New England Basements
New England basements are hard on lally columns in a few specific ways. Humidity is the big one. Basements in coastal towns and older homes with dirt or poorly sealed crawl spaces stay damp most of the year, and that moisture is what turns a solid steel column into a rusted one over time.
Homes built before the 1970s often have footings that were undersized to begin with, so the column has been working harder than it was ever meant to since the day it went in. Add New England's freeze and thaw cycle, which shifts the soil under and around a foundation every winter, and even a properly installed column can end up out of plumb or carrying more load than it was designed for.
We saw this play out on a recent lally column replacement on Cape Cod, where a pre-sale home inspection caught a crawl space full of failing columns: temporary jacks rusted to the point that a light kick would have knocked them over, and older footings sitting directly on sand instead of solid concrete. Moisture was the root cause of nearly everything the inspector found that day.
What Lally Column Replacement Involves
If your inspection turns up a column that needs to be replaced, the fix itself is fairly standard, even though it looks dramatic while it is happening. We break the section of floor where the column sits, dig down below the frost line, and pour a new concrete footing.
Once that footing has cured, we set a lally column replacement made of steel and filled solid with concrete on top of it, cut to the exact height, with a plate and cup welded on top and bolted to the beam above. Most single-column jobs take a day or two from start to finish, and we do this work year-round across Massachusetts, Rhode Island, New Hampshire, and Connecticut.
Lally column replacement cost depends mainly on how many columns need work and whether a new footing has to be poured for each one. The clearest way to get an accurate number is a free on-site estimate, since every basement and every column is a little different.
What This Means If You're Buying or Selling a Home
A flagged lally column is one of the most common home inspection foundation issues we see in the Greater Boston market, and it rarely has to be a deal-breaker. Most purchase and sale agreements give buyers and sellers a set window to resolve inspection items, and lally column replacement is usually quick enough to fit inside it once the work is scheduled. If lally columns are the only items on your home inspection checklist flagged for structural attention; that is generally a good sign. It means the rest of the foundation held up to scrutiny.
Need to Get Your Lally Column Checked Out?
If a lally column inspection just turned up on your report, or you want to get ahead of one before you list, contact A1 Foundation Crack Repair at 866-929-3171 for a free, straightforward estimate. We've handled this exact issue in basements across Boston and the rest of New England for decades, and we're happy to walk you through what your specific columns need.