# House Foundation Repair: A Diagnostic Order

> Foundation repair starts with measurement, not a sales visit. See the order of diagnosis, the methods that match each finding, and the costs.

Canonical: https://foundationrepairlab.com/house-foundation-repair/

Last updated: 2026-11-09

House foundation repair begins with measurement, not with a contractor's opinion. Crack width, wall plumb, and floor elevation tell you which method applies, and the method sets the price. Most [foundation repair](https://foundationrepairlab.com/foundation-repair-cost/) work runs $4,000 to $15,000, but only after the diagnosis says which repair is actually needed.

## Step One: Measure Before You Choose

A crack at 1/16 inch is usually cosmetic. At 1/8 inch it should be monitored with a gauge and photographed monthly. A wall that is out of plumb by more than an inch, or a floor that has dropped more than an inch across a room, moves the project from observation to engineering.

Write the numbers down with dates. Two readings a month apart are worth more than any description, because they show whether the movement is active. A dormant crack and an active crack can look identical in a photograph.

## What the Symptoms Usually Mean

| Symptom | Likely cause | Method |
|---|---|---|
| Vertical crack, stable | Shrinkage or minor settlement | Injection if leaking |
| Stair-step crack in block | Corner settlement | Underpinning piers |
| Horizontal crack, bowing wall | Lateral soil pressure | Anchors or carbon straps |
| Sloping floor, sticking doors | Settlement of the structure | Piers and leveling |
| Crack at wall and ceiling joint | Roof or frame movement | Engineer review |

The same symptom can have two causes, which is why the inspection matters. A crack above a door frame can be settlement, or it can be a missing header. A slab crack can be a void, or it can be a post-tension tendon failure. Measure, then diagnose.

## The Methods and Their Prices

| Method | Cost | What it fixes |
|---|---|---|
| Crack injection | $400 - $1,200 | Leaks in a stable wall |
| Push piers | $1,000 - $3,000 each | Deep settlement |
| Helical piers | $700 - $2,500 each | Lighter loads, tight access |
| Wall anchors | $500 - $1,500 each | Bowing from soil pressure |
| Carbon fibre straps | $400 - $1,200 each | Bowing block walls |
| Slab lifting | $3 - $12 per sq ft | Settled flatwork |

A full pier job commonly runs $6,000 to $30,000 because most houses need several piers. The per-unit price is only meaningful with a stated count.

## The Arithmetic of a Typical Job

A 1,500 sq ft house has settled along two walls. The engineer specifies nine push piers at $1,900 each:

9 × $1,900 = $17,100

Engineering at $900 and interior restoration at 10% to 25%:

$17,100 × 0.10 = $1,710
$17,100 × 0.25 = $4,275

All-in: $19,710 to $22,275. That is a major repair, not a typical one, and it sits just under the $20,000 to $40,000 band. A single-wall job with four piers at the same price would be $7,600 plus engineering, which is squarely in the typical range.

## Why Engineering Is Not Optional

For a wall that is out of plumb, for a house with a second story, and for any lift beyond an inch, an engineer's report is the difference between a repair and an experiment. The report sets the pier type, the spacing, the design depth, and the lift tolerance. It also tells the contractor when to stop lifting, which is the instruction that protects your plumbing and your drywall.

The cost is $400 to $1,500. Against a $20,000 repair, that is 2% to 7.5% of the budget for the document that defines the work. Skipping it to save money is the most expensive shortcut in this trade.

## The Repair Sequence

1. Measure cracks and record floor elevations.
2. Book an engineer if any threshold is crossed.
3. Fix drainage and roof water so the cause stops loading the foundation.
4. Permit the work; local review takes one to three weeks.
5. Install piers, anchors, or straps to the engineer's specification.
6. Lift and lock off, then verify with a second elevation reading.
7. Repair interior finishes after a one to two week settling period.

## What to Ask Before Hiring

Ask for the engineer's report, the pier count, the design depth, and the warranty terms. Ask what happens if refusal comes early or late, and get the overrun rate in writing. Ask for the lift record at completion, because it is the proof the work was done to plan.

Then compare at least three bids against the same scope. A bid that is 40% below the others usually has fewer piers, a shallower design, or no engineering, and those differences are invisible on the invoice total. Read [how to choose a foundation contractor](https://foundationrepairlab.com/how-to-choose-a-foundation-contractor/) and [foundation repair red flags](https://foundationrepairlab.com/foundation-repair-red-flags/) before you sign.

## Living in a House Under Repair

Most house foundation jobs do not require moving out. Exterior piers are installed from trenches outside the wall, and the house stays occupied. The parts that disrupt daily life are the noise, the blocked driveway, and the dust that finds its way through basement windows even when they are taped.

Plan for two to five days of abnormal noise and one day of genuine vibration during the lift. Move breakables away from the walls on the working side, keep vehicles off the driveway, and expect the water to be shut off briefly if interior plumbing is part of the scope. If the house has a finished basement and the work is inside, seal the stairwell with plastic and run a fan to the exterior; concrete dust travels through a house faster than most people expect.

After the lift, give the structure a week or two before patching drywall. The frame settles into its new position, doors that were adjusted on lift day may need a second adjustment, and paint applied too early will show the seam again. Contractors who schedule the finish work as part of the original job usually get this right; contractors who treat it as an extra rarely do.