Low end
$1,500
Typical range
$1,500 - $15,000
High end
$15,000+
Crawlspace Repair Cost Components
Crawlspace projects typically combine several scopes of work. Understanding each component helps you evaluate what you’re being quoted for.
| Component | Typical Range | Notes |
|---|---|---|
| Individual pier shimming | $150-$400/pier | Existing pier OK but settled |
| Pier replacement | $250-$600/pier | Standard concrete or steel |
| Beam sistering | $50-$150/linear ft | Adding support alongside damaged beam |
| Vapor barrier (ground only) | $500-$2,000 | 6-12 mil poly, basic coverage |
| Full encapsulation | $2,000-$8,000 | Ground + walls + sealed vents |
| Crawlspace dehumidifier | $800-$1,500 | Equipment; plus installation |
| Interior drainage + sump | $2,000-$5,000 | For active water intrusion |
| Pest treatment | $200-$800 | Required before wood replacement |
Project Cost by Scope
| Scope | Typical Total |
|---|---|
| Minor pier shimming only | $500 - $2,000 |
| Structural repair (4-8 piers + beam work) | $2,000 - $6,000 |
| Vapor barrier installation only | $500 - $2,000 |
| Structural + vapor barrier | $2,500 - $7,000 |
| Full encapsulation only | $2,000 - $8,000 |
| Structural + full encapsulation | $4,000 - $12,000 |
| Comprehensive remediation (all scopes) | $8,000 - $20,000 |
What Affects Crawlspace Repair Cost
Crawlspace Size
Vapor barrier and encapsulation costs are largely driven by square footage. A 600 sq ft crawlspace costs half as much to encapsulate as a 1,200 sq ft crawlspace, all else equal.
Crawlspace Clearance
Working in a 24-inch crawlspace is significantly harder (and slower) than a 48-inch crawlspace. Contractors price low-clearance work at a premium because it’s physically demanding and slower.
Active Water Intrusion
If water is entering the crawlspace from the exterior (foundation walls, surface drainage), a vapor barrier alone is insufficient - you need interior drainage and a sump pump. This adds $2,000-$5,000.
Extent of Structural Damage
How many piers need shimming or replacement, how much beam and joist work is needed, and whether the framing has pest damage all drive the structural component of the cost.
Access Difficulty
If the crawlspace access hatch is very small, inconveniently located, or requires tools to open, labor costs increase. Contractors factor in the time to move materials in and out.
Estimating Your Crawlspace Repair Cost
The most reliable way to estimate cost is to have 3+ contractors inspect the crawlspace and provide itemized quotes. Compare:
- What’s included - some quotes bundle structural and encapsulation; others quote separately
- Vapor barrier spec - 6 mil poly vs. 12-20 mil reinforced liner is a significant quality difference
- Warranty - structural work should carry a warranty; encapsulation materials typically carry manufacturer warranties
- Pest treatment - who is responsible for pest treatment, and when?
Avoid quotes that come without a crawlspace inspection - there’s no way to price crawlspace work accurately without seeing what’s inside.
Signs a Crawl Space Foundation Needs Structural Repair
Moisture problems are easy to smell and see, but structural failure often shows up first in the rooms above the crawl space. Watch for these signs:
- Sagging or dipping floors. A floor that slopes toward the center of a room, or a noticeable low spot, usually means a girder or the piers under it have settled.
- Bouncy or springy floors. Floors that flex or vibrate when you walk across them point to weak, overspanned, or rotted joists rather than settled piers.
- Cracked or crumbling piers. Concrete block piers that are cracked, leaning, or spalling have lost bearing capacity. Wood posts that are split or crushed are a similar red flag.
- Gaps at trim and baseboards. When a section of floor drops, you often see gaps open up between the baseboard and the floor, or between crown molding and the ceiling on the level above.
- Sticking interior doors. Doors that suddenly stick or swing open on their own can reflect a floor system that is no longer level. This overlaps with slab symptoms, so match it against the other signs here.
- Piers not touching the beam. In the crawl space itself, daylight or a visible gap between the top of a pier and the girder means that pier has stopped carrying load.
If you spot several of these together, the problem is structural and not just cosmetic. Sagging and springiness that trace back to the framing are covered in more detail on the uneven floors and floor joist damage pages.
Structural Repair Types and Costs
Structural crawl space repair is really a set of distinct fixes. A quote usually combines two or three of them. Here is what each one addresses and what it costs.
| Repair type | Typical cost | What it fixes |
|---|---|---|
| Shimming / re-leveling existing piers | $150-$400 per pier | Sound pier that has settled or dropped off the beam |
| Adding new support piers | $300-$800 per pier | Overspanned girder or a missing support point |
| Replacing failed piers | $250-$600 per pier | Cracked, leaning, or crumbling concrete or wood piers |
| Adjustable steel jack posts | $150-$400 per post | Temporary or permanent point support under a beam |
| Sistering floor joists | $100-$300 per joist | Cracked, sagging, or partially rotted joists |
| Replacing floor joists | $200-$600 per joist | Joists rotted through or crushed |
| Girder / beam replacement | $1,000-$5,000 per beam | Rotted, split, or undersized main support beam |
| New concrete footings | $500-$1,500 per footing | Piers sitting on soil with no proper footing |
| Helical piers (perimeter settlement) | $1,500-$3,000 per pier | Settling foundation walls or perimeter piers on poor soil |
A few notes on how these fit together:
- Piers and jacks are the workhorses. Shimming is the cheapest fix and works when the pier itself is sound but the beam has dropped away from it. When a pier is failing, replacement is the honest fix, and when a girder simply spans too far, adding a new pier and footing between the existing ones solves the sag.
- Sistering vs replacing joists. Sistering bolts or nails a matching board alongside a weak joist and is far cheaper than removing the old member. Full replacement is only needed when a joist is rotted through or crushed.
- Girder and beam work is the big-ticket structural item. A rotted main beam has to be temporarily supported on jacks, cut out, and rebuilt, which is why it runs into the thousands.
- Helical piers come into play when the settlement is at the perimeter foundation rather than the interior piers. They are drilled deep to reach stable soil. See the helical piers cost page for a full breakdown, and the pier and beam foundation repair service page for how these methods are combined on a typical home.
Cost by Scope With Worked Examples
The single biggest driver of a structural quote is how much of the system is failing. Three common scopes:
Minor shimming and re-leveling. A localized dip in one room, caused by a few piers that have settled off the beam. The contractor re-shims 4 to 6 piers and checks the girder for level. Worked example: 5 piers at $250 each equals roughly $1,250, landing this job in the $500 to $2,000 range.
New and replacement piers with beam support. A section of the home has settled, several piers are cracked, and a girder is sagging. The contractor replaces 4 piers, adds 2 new piers with footings, and jacks the beam back to level. Worked example: 4 replacement piers at $450, 2 new piers at $600, plus a footing allowance and leveling labor, totals roughly $3,500 to $5,500.
Full re-level with joist and beam work. Widespread settlement plus rot from a long-standing moisture problem. The contractor re-supports the whole floor system, sisters a run of joists, replaces one main girder, and re-levels across the footprint. Worked example: a main beam replacement at $3,000, 10 sistered joists at $200, plus 8 piers of pier and leveling work, pushes this into the $8,000 to $15,000+ range, which is why the top of this guide reaches $15,000.
For homes where the whole floor structure needs to be brought back to level rather than spot-fixed, compare the dedicated house leveling cost guide, which covers the leveling process across pier and beam and slab systems.
How Moisture Damage Drives Structural Cost
On many crawl space jobs, the structural damage exists because the crawl space was wet for years. Standing water and high humidity feed wood rot and wood-destroying insects, and both attack the same members you pay to repair: the joists, the girders, and the sill plate.
This is why a structural quote can balloon. A pier that settled on soft soil is a clean fix. A girder that rotted because the ground under it stayed saturated means you are paying to replace the beam and to stop the water that caused it, or the new beam rots too. When rot spreads across the joists, joist work alone can add several thousand dollars, as covered on the floor joist damage page.
The moisture side of the fix, vapor barriers, wall liner, sealed vents, and dehumidifiers, has its own pricing. Rather than repeat it here, see the crawl space encapsulation cost page for those numbers. The short version: budget for the structural repair AND the moisture control, because doing one without the other is how homeowners end up paying twice. Most of this traces back to a wet crawl space, so fixing the water source is step one.
DIY vs Professional Structural Repair
Cosmetic and preventive tasks in a crawl space are reasonable DIY: laying a ground vapor sheet, clearing debris, improving exterior drainage, or adding a simple temporary jack post under a bouncy floor to reduce flex.
Load-bearing structural work is not a good DIY candidate. Jacking a settled floor has to be done slowly and in small increments to avoid cracking the finishes above, and lifting too fast can do more damage than the settlement did. Replacing a girder means holding up the entire floor on temporary supports while you work underneath it. Getting the load path wrong is a safety risk. Pier placement, footing size, and how far to lift are engineering judgments, and structural warranties only come with professional installation. For anything involving piers, beams, or re-leveling, hire a contractor. The crawlspace foundation repair service page explains what a professional scope includes.
Repair Timeline
Most crawl space structural jobs are faster than homeowners expect because the work happens under the house without disrupting living space.
- Minor shimming or a few piers: 1 day.
- Multiple pier replacement plus beam support: 2 to 4 days.
- Full re-level with joist and girder work: 3 to 7 days, sometimes longer if rot is worse than expected once the crew is inside.
- Adding encapsulation afterward: 1 to 3 more days, typically scheduled as a separate phase once the structure is sound.
Weather rarely stops crawl space work since it is sheltered, but active water intrusion may need to be pumped down before the crew can start.