Does Every Foundation Crack Need Repair?

The short answer

No. Plenty of foundation cracks are cosmetic, stable, and best left alone. The trick is knowing which is which.

Cracks that usually need nothing

• Hairline cracks less than about a sixteenth of an inch wide
• Shrinkage cracks in a poured wall, which often appear in the first year and then stop
• Vertical cracks that have been the same width for years
• Cracks in a garage slab or a sidewalk with no other symptoms

For these, the right move is to photograph them with a date, then check again in six months.

Cracks that need a look

• Stair-step cracks in brick veneer
• Horizontal cracks in a foundation wall — these suggest lateral pressure
• Cracks wider than a quarter inch
• Cracks that are wider at one end than the other, which shows rotation
• Any crack accompanied by sticking doors, sloping floors or a musty crawl space

The symptoms matter more than the crack

Here's the thing I tell every homeowner: a crack on its own is just a crack. A crack plus a symptom is a pattern.

If your foundation crack comes with any of these, it's worth investigating:

• Doors or windows that stick in one season and free up in another
• A floor that slopes or bounces
• Cracks in drywall above door frames
• Water in the crawl space or basement
• Bricks or trim pulling away from the wall

Why I say no so often

I make my living doing foundation work. But a big part of my job is telling people they don't need it.

Every foundation repair changes the house in some way, and every one costs real money. Doing one that isn't needed isn't just wasteful — it can create problems that weren't there.

What to do next

If you're unsure, take two photos: one wide shot showing the whole wall or room, and one close-up with something for scale next to the crack. Send them to me and I'll give you a straight read.