How Much Does Spray Foam Insulation Cost in Peoria IL? [2026 Guide]

The Short Answer: What It Costs

Spray foam insulation in the Peoria area typically runs $1,500 to $6,500 for a full residential project, depending on the type of foam and the area being insulated. A standard attic insulation job on a 1,200 sq ft home falls somewhere between $2,000 and $4,000. Crawl spaces and rim joists tend to be smaller dollar amounts — $600 to $1,800 — because you're covering less square footage.

Those numbers mean nothing without context. Here's what actually drives the price.

Open Cell vs Closed Cell: The Biggest Price Factor

This is the decision that affects your bill more than anything else. Open cell and closed cell foam are two different products with different properties and very different costs.

Foam Type	Cost Per Board Foot	R-Value Per Inch	Best For
Open Cell	$0.44–$0.65	~3.5	Attics, interior walls, sound dampening
Closed Cell	$1.00–$1.50	~6.5	Crawl spaces, basement walls, exterior applications

Open cell foam is softer, expands more, and is the go-to for attic insulation. It seals air gaps and provides solid thermal performance at a lower cost. The downside is that it absorbs moisture, so you don't want it in wet areas.

Closed cell foam is denser, harder, and acts as both an insulator and a vapor barrier. It's more expensive, but in a Peoria crawl space — where ground moisture is a real problem — it's usually the right call. Closed cell also adds structural rigidity to the surfaces it's applied to.

Which one do you need? For most attic jobs, open cell is fine. For crawl spaces, basement walls, and anywhere moisture could be an issue, we recommend closed cell. When you're not sure, call us and we'll give you a straight answer — no pressure, no upsell.

What Else Affects the Price

Beyond foam type, here's what moves the number up or down on a Peoria job:

Square Footage and Thickness

Spray foam pricing is measured in board feet — one square foot of foam applied one inch thick. An attic might need 5–6 inches of open cell to hit the right R-value. A crawl space might only need 2–3 inches of closed cell. More area, more inches, higher total.

Accessibility

An open attic hatch and a clean crawl space are easy. A cramped attic with knee walls and cross-bracing, or a 24-inch clearance crawl space with plumbing in the way — those take longer. More labor time means higher cost.

Existing Insulation Removal

If you have old fiberglass batts that need to come out before we can spray, that's added labor. We'll tell you upfront whether it needs to go or whether we can work around it.

Peoria Weather Timing

Spray foam requires temperatures above 50°F to cure properly. Jobs booked in the shoulder seasons — late fall or early spring — sometimes require additional prep if we're working in cold spaces. This rarely affects price much, but it's worth knowing.

Real-World Job Examples From Peoria

Here's how these numbers look on actual jobs we've done in the area:

1,000 sq ft attic, open cell, 5 inches: approximately $2,100–$2,800
Full crawl space, closed cell, 2.5 inches: approximately $1,400–$2,200
Basement rim joists only: approximately $600–$950
New construction, full exterior walls: approximately $3,500–$7,000 depending on footprint

These are ballpark figures for the Peoria market. Your number will depend on your specific situation. The only way to get an accurate quote is to have someone look at it — which is why we offer free estimates on all major projects.

Get Your Free Peoria Estimate

We'll tell you exactly what your project needs and what it'll cost. No surprises.

CALL 309-491-4457

How to Know If You're Getting a Fair Quote

If you're shopping around — which you should — here's how to compare quotes properly:

Ask for the board feet being quoted, not just the total price. This lets you compare apples to apples.
Make sure the quote specifies open cell or closed cell and the target thickness. A lower price for thinner foam isn't a bargain.
Check that the contractor has liability insurance. Spray foam equipment is high-pressure and high-temperature. Uninsured crews are a bad bet.
Ask whether prep, cleanup, and disposal are included. Some contractors price these separately.

We're happy to explain our quotes line by line. If another contractor's number looks dramatically lower, ask them to show you the board feet and thickness — the two numbers don't lie.

What You Get Back: The ROI Case

Spray foam isn't cheap compared to blown-in fiberglass or batts. But it's not really the same product. The air seal you get with spray foam is something other insulation materials simply can't deliver. Fiberglass batts do nothing about air movement — they just slow heat transfer. Spray foam stops both.

The average Peoria homeowner we work with sees a 15–30% reduction in heating and cooling costs after a spray foam job. At current gas and electric rates, a $2,500 attic project often pays for itself in 4–6 years. After that, it's pure savings — every year, indefinitely.

If you're planning to stay in your home long-term, spray foam is one of the better investments you can make in it. If you're selling, it's a legitimate selling point — buyers and inspectors both take note of a properly insulated attic.

Next Steps

If you're ready to get a number on your project, give us a call. We serve Peoria, East Peoria, Peoria Heights, Washington, Morton, Dunlap, Chillicothe, and the surrounding area. We'll come out, take a look, and give you a written quote — no obligation, no hard sell.

If you have questions before you're ready to schedule, call or text us at 309-491-4457. We answer our own phones.

Frequently Asked Questions About Spray Foam Insulation Costs

What is the difference in open cell vs closed cell spray foam cost?

Open cell spray foam typically costs $0.44–$0.65 per board foot in the Peoria area, while closed cell runs $1.00–$1.50 per board foot. Closed cell costs more because it uses a denser, two-component foam that also acts as a vapor barrier. For most attics, open cell works fine. For crawl spaces and below-grade applications, closed cell is almost always the right call.

What is the spray foam insulation cost per square foot?

Cost per square foot depends on the thickness applied. Open cell at 3.5 inches (standard wall cavity) runs roughly $1.50–$2.25 per square foot installed. Closed cell at 2 inches runs $2.00–$3.00 per square foot. Attic jobs usually need 5–6 inches of open cell, which puts most Peoria attic projects in the $1,800–$4,500 range depending on size.

Is spray foam insulation worth it?

For most Peoria homes, yes. Spray foam creates an air seal that fiberglass batts simply can't match. The typical homeowner sees a 15–30% reduction in heating and cooling costs. Given that Peoria winters regularly hit single digits, that savings adds up fast. Most jobs pay for themselves in 4–7 years, and spray foam lasts the lifetime of the building.

How long does spray foam insulation last?

Properly installed spray foam insulation lasts 80+ years. Unlike fiberglass, it doesn't sag, settle, or absorb moisture over time. It bonds to the substrate and stays put. The foam itself doesn't degrade under normal conditions. The only reason to replace it would be if you're doing a major structural renovation that requires removing it.