Find Why The Floor Is Sagging Before You Try To Fix It

Because the visible sag is the symptom, not the cause. The cause is one of five things. Joist failure, beam failure, post settlement, foundation movement, or over-load, and the repair is wrong if it doesn't match the cause. The $200 to $400 laser survey takes 60 to 90 minutes and identifies the actual failure mode. It's refunded against the repair if Epp does the work. The $300 spent on the survey prevents thousands spent on the wrong scope.

Two causes account for most of our sagging-floor work in NE and IA: localized rot at the sill-contact end of floor joists in chronically wet crawl spaces (about 40% of jobs), and settled support posts where an old wood 4x4 on a small unreinforced concrete pad has sunk into wet clay (about 30% of jobs). The remaining 30% splits between undersized 1950 to 1970s joists, beam failures, and foundation movement at the perimeter.

Single-cause repair (one settled post, or three sistered joists): $2,500 to $5,000. Multi-cause repair (sistered joists plus beam reinforcement plus helical pier): $7,000 to $15,000. Per-component: sistered joist $300 to $600, end-rot repair $400 to $800, beam reinforcement $80 to $200 per linear foot, helical pier under settled post $1,500 to $2,500, jack post $300 to $600. Laser-level survey $200 to $400, refunded against repair. Written estimate after on-site inspection reflects your scope.

When the failure is actually at the perimeter foundation rather than under the interior floor. That's foundation underpinning, quoted from the foundation-repair silo. When the sag is from pest damage with active infestation. Licensed pest control treats first, structural repair follows. When the floor is sagging because of subfloor failure (rotted plywood, water damage) rather than joist or support failure. That's finish carpenter scope, not structural scope.

Almost never. Epp targets restoring the floor to within 1/4 inch of original elevation, which is the threshold where the floor feels level underfoot and finish materials (hardwood, tile) sit flat. Pushing for perfectly level on a 50-year-old home risks cracking drywall, trim, plumbing rough-ins, and tile that have all settled into the sagged position. The lift is intentionally limited and intentionally gradual (1/16 inch per day on a finished floor) to balance restoration against secondary damage.

Diagnosis (laser survey) is one visit, 60 to 90 minutes. Single-cause repair is one to three days on-site, plus a gradual lift cycle of one to three weeks if the floor above is finished (1/16 inch per day lift schedule). Multi-cause repair is three to seven days on-site, plus the lift cycle. Helical pier installation under a settled post is a single day. The lift cycle is what extends the calendar. Not the on-site work.

Almost never, if the crawl space or basement below is accessible. Joist sistering, end-rot repair, jack post installation, helical pier installation, and beam reinforcement are all executed from below without disturbing the floor above. The exception is multi-cause repair where ceiling drywall in a finished basement blocks access. Drywall removal and patching are coordinated as separate finish-trade scope, not structural scope.

Let's take the first step toward a healthy home.

A local specialist will inspect your foundation, walk you through the findings, and send a clear estimate. no cost, no pressure.