How Much Does Crawl Space Encapsulation Cost in Oklahoma City?
The Short Answer
In the Oklahoma City area, full crawl space encapsulation usually costs about $3.50 to $7.50 per square foot of crawl space floor, including the liner, vent and rim sealing and a dehumidifier. For a typical 1,200 sq ft crawl space that is roughly $5,000 to $9,500. Small crawl spaces under older bungalows can come in under $5,000, while large crawl spaces with tall walls, drainage work or mold cleanup can pass $15,000.
These are planning ranges. The free written quote after we inspect your crawl space is the number that counts.
What Is Included
- A 12 to 20 mil reinforced liner over the soil, up the walls and around piers
- Seams overlapped and sealed with tape or mastic
- Foundation vents closed and rim joist gaps air sealed
- A crawl space dehumidifier with a proper drain
- A sealed, insulated access door
- Removal of old plastic, insulation and debris
Some quotes also include wall insulation, a sump pump or a remote humidity monitor. Compare quotes item by item so you are comparing the same system.
Typical Price Ranges by Item
| Item | Typical Range |
|---|---|
| Liner, floor and walls, with sealing | $2.50 to $5.50 per sq ft |
| Crawl space dehumidifier, installed | $1,500 to $3,000 |
| Sealed access door | $300 to $900 |
| Old insulation and debris removal | $1.00 to $2.00 per sq ft |
| Sump pump and basin | $1,200 to $2,500 |
| Interior perimeter drain | $30 to $70 per linear ft |
| Mold remediation | $1,500 to $4,500 |
Two Worked Examples
1940s bungalow, about 1,000 sq ft. Damp but no standing water, humidity in the 70s in summer. A 12 to 20 mil liner, sealed vents and rim, and a dehumidifier comes to roughly $4,500 to $7,500. Light mold on a few joists adds $800 to $1,500.
Ranch home, about 1,800 sq ft, water after storms. An interior drain with a sump pump runs about $3,000 to $5,500 and encapsulation about $6,500 to $11,000, for a total near $9,500 to $16,500. Fixing gutters and grading first can sometimes shrink the drainage portion.
What Pushes the Price Up
Low clearance under 18 inches slows the crew. Tall foundation walls add liner area. Many piers mean more cutting and sealing. Ducts, plumbing and gas lines low in the crawl space add time. Standing water, mold or rotted framing must be handled before the liner goes in, and those are priced separately. In Oklahoma City, settled piers are also common, so it often makes sense to level the floor before the liner is installed.
Ways to Keep the Cost Reasonable
Fix the outside first: clean gutters, extend downspouts 6 to 10 feet and slope the soil away from the house. Ask about liner options, since a 12 mil liner may be fine if the crawl space is rarely entered. Do not count on the federal 25C tax credit, which ended for insulation and air sealing placed in service after December 31, 2025. Ask OG&E or your utility about any current rebates.
Want to run your own numbers? Try our crawl space encapsulation cost estimator, or see the crawl space encapsulation page.
Want a free quote?
Call (405) 400-1701 or use the form for a free inspection and written quote.
