How Much Does Crawl Space Insulation Cost? (3 References)

Crawl space insulation costs $3,550 on average for a 1,000-square-foot space, with most projects landing between $2,600 and $16,900.¹ Fixr puts the national average at $2,000, and Homewyse estimates $2.75 to $6.08 per square foot installed. Prices below are national averages* for 2026.

*National averages, not local quotes. Your price depends on insulation type, crawl space size, and prep work like cleaning, repairs, or old insulation removal.

$3,550

average, 1,000 sq ft (Angi)

$2,600 – $16,900

typical range (Angi)

$2,000

national average (Fixr)

$2.75 – $6.08

per sq ft installed (Homewyse)

What sources say

Source	Figure	Scope
Angi	$3,550 average; $2,600 – $16,900 range	Average 1,000 sq ft crawl space, professional installation
Fixr	$2,000 average; $500 – $6,000 range	Spray foam in an 800 sq ft crawl space
Homewyse	$2.75 – $6.08 per sq ft	Installed batt insulation, basic mid-range work (May 2026)

These figures describe different baseline jobs, so treat them as a spread of averages rather than one price: Angi’s covers a 1,000 sq ft professional project across materials, Fixr’s national average assumes spray foam in an 800 sq ft space, and Homewyse’s per-square-foot estimate models batt insulation between floor joists.^1,2,3

Cost by insulation type

Angi breaks out materials versus installed cost per square foot:¹

Type	Materials (per sq ft)	With labor (per sq ft)
Batt and roll	$0.30 – $1.50	$0.55 – $2
Blown-in and loose-fill	$1 – $2	$1.25 – $2.50
Rigid foam board	$0.25 – $2	$0.50 – $2.50
Spray foam	$1 – $4 per board foot	$3 – $8

Fixr’s installed figures run higher: batt $1 to $2, roll $1 to $2, foam board $1 to $4, and spray foam $2 to $5 per square foot.² The two sources also disagree on blown-in insulation: Angi lists it as a crawl space option, while Fixr says professionals do not recommend blown-in for crawl spaces because of the tight space.^1,2 Ask your installer which types they will warrant in your space.

Cost by crawl space size

Angi’s size table covers materials only; Fixr’s covers installed cost. Both per-square-foot spans widen for larger spaces.

Size (sq ft)	Angi (materials only)	Fixr (installed)
250	$75 – $1,700	—
300	—	$300 – $1,500
500	$150 – $3,400	$500 – $2,500
800	—	$800 – $4,000
1,000	$300 – $6,800	$1,000 – $5,000
1,200	—	$1,200 – $6,000
1,500	$450 – $10,100	$1,500 – $7,500
2,000	$600 – $13,500	$2,000 – $10,000
2,500	$750 – $16,900	$2,500 – $12,500

Cost by material (Angi)

Material	Average cost per sq ft (materials)
Fiberglass	$0.30 – $1.50
Cellulose	$0.60 – $2.30
Mineral wool	$1.40 – $3.10
Polystyrene	$0.25 – $0.50
Wood fiber	$4.25 – $6.75

Fiberglass is the most familiar option but is vulnerable to moisture in crawl spaces; Angi notes it performs best paired with a vapor barrier or full encapsulation.¹

Labor and prep costs (Angi)

Professional installation adds $0.25 to $0.50 per square foot in labor, or $60 to $100 per hour for installers who bill hourly.¹ Common prep line items:

Prep item	Average cost
Crawl space cleaning	$0.55 – $2.70 per sq ft ($550 – $2,700 for 1,000 sq ft)
Old insulation removal	$1 – $1.50 per sq ft
Crawl space repair	$0.55 – $2.70 per sq ft
Full encapsulation (optional add-on)	$5,000 – $15,000

If your crawl space has moisture problems, insulation alone may not hold up. See our crawl space encapsulation cost guide for what a sealed system adds.

DIY vs professional installation

Angi calls batt and roll fiberglass the most DIY-friendly option, while spray foam benefits from professional equipment and precision; skipping labor saves $0.25 to $0.50 per square foot, or $60 to $1,250 total.¹ Tight clearances, moisture, and wiring make crawl spaces harder to work in than attics, so get at least one professional assessment before committing to DIY.

Sources
1. Angi — Crawl Space Insulation Cost
2. Fixr — Crawl Space Insulation Cost
3. Homewyse — Cost to Insulate a Crawl Space