Do I need a concrete foundation?

If your home already stands on a foundation, you almost never need a new concrete one. You need the foundation you have to be sound and dry. We are 603 Basement Solutions, and most calls we get about a “new foundation” turn out to be a repair job, not a rebuild. We fix and stabilize foundations across New Hampshire, Maine, and Massachusetts. We do not pour new ones.

So let’s sort out what you actually need.

What a concrete foundation does, and when you have one

A foundation carries the weight of your house and keeps it level on the ground. Most New England homes already have one. Poured concrete, block, even older fieldstone. If your house is up and standing, you have a foundation under it. The question is rarely “do I need one.” It is “is mine still doing its job.”

You would need a brand new foundation only in a few cases. New construction on bare land. An addition with no existing footing. Or a foundation so far gone that it has to come out and go back. Those are pour jobs. We do repair, not new builds, so for new construction you want a general contractor or a concrete outfit.

The real question: is your foundation failing?

Here is where most homeowners land. The foundation is there, but something looks wrong. Watch for these.

A crack you can fit a coin into. Walls bowing inward. Doors that stick. Sloping floors. Gaps where the wall meets the floor. Stairs pulling away from the house.

Those are signs the foundation is moving, not signs you need a new one. Movement has a fix that costs far less than a rebuild.

Why do walls move here? Two reasons. The soil right against your foundation is disturbed backfill, the loose dirt put back when the house was built. It drains slowly and holds water. Then NH frost heave pushes on it through winter, and that pressure shoves walls inward over time. Neutral building-science groups like DOE Building America (basc.pnnl.gov) cover how soil and water behave around foundations.

How we fix a foundation instead of replacing it

Most foundation problems get solved with targeted repair. We self-perform this work in-house.

A poured-concrete crack that leaks or spreads gets crack injection, epoxy or polyurethane, starting around $1,000 to $3,000 with a 10-year warranty. A wall bowing from soil pressure gets carbon-fiber straps from $850 each, warrantied 25 years, or a power brace from $1,300 per brace for heavier movement. A foundation settling or sinking gets helical or push piers from $2,700 per pier for the first three, then $2,200 per pier after that, 25-year engineered warranty, to carry the load back down to stable ground. Sagging floors get lally columns and floor support from $1,300 to $2,500. A rotted sill or beam gets sill and beam replacement from $7,000 to $40,000. When a wall is too far gone for straps but you do not want a full rebuild, an auxiliary (sister) wall from about $1,350 per linear foot braces it.

A few things we price only after we see them. Full foundation-wall rebuilds, wall anchors, and steel I-beams. We price that after we see it.

You do not need every one of these. Most homes need one or two. A free inspection tells you which.

What about water, not cracks?

Plenty of “foundation” worries are really water worries. A wet basement does not mean your foundation failed. It means water is getting in through the floor wall joint or a crack. That is a waterproofing job, handled with our Forever Dry System, interior perimeter drainage into a sump pump with a vapor barrier and dehumidifier, from $3,000 to $30,000 and guaranteed dry for life. A crawl space with a dirt floor gets crawlspace encapsulation from $3,000 to $25,000 instead.

We do not do exterior excavation waterproofing. In our experience it fails in a couple of years. The durable fix is interior drainage.

So, do you need a concrete foundation?

If you are building new, yes, and that is a concrete contractor’s job. If your house already stands, almost certainly not. You need yours inspected, and likely a repair. See our structural and foundation repair and foundation repair hubs, and the 603 guarantee for how our warranties transfer.

Not sure which camp you are in? Get eyes on it before you spend a dime on a rebuild you may not need.

Call us at 603-610-1770 or book your free inspection. Free inspection, free estimate, and a quote within 24 hours. We will tell you if you need a repair, a waterproofing fix, or nothing yet!

Related questions

Is a cracked foundation dangerous? Some cracks are cosmetic. Others mean the wall is moving. A hairline crack often just needs sealing. A wide or growing crack, or one with the wall bowing, needs a structural fix like carbon-fiber straps or piers. A free inspection tells you which.

Can you repair a foundation without replacing it? Almost always, yes. Crack injection, carbon-fiber straps, a power brace, helical piers, and lally columns each fix a different problem for far less than a rebuild. We do repair work in-house and price full rebuilds only after we see them.

Does foundation repair affect my homeowners insurance? It can vary by policy. Many policies treat earth movement and gradual settling differently from a sudden event. Check with your carrier, and see the Insurance Information Institute (iii.org) for how foundation and water claims generally work.

Do I need a new foundation if my basement floods? Usually no. Flooding is a water problem, not a structural one. The fix is waterproofing with interior drainage and a sump, not a new foundation.