Spray foam insulation and air sealing are highly effective solutions for improving your home's energy efficiency, comfort, and indoor air quality across St. Louis. Whether you need attic insulation, crawl space sealing, rim joist protection, or comprehensive air sealing, pricing varies based on your specific project size, foam type, accessibility, and existing conditions. We're transparent about costs so you can make an informed decision with confidence.
Pricing guide
These rates are indicative. Every job is unique: size, access, complexity. Request a free estimate for exact pricing tailored to your situation.
| Service | Price | Details |
|---|---|---|
| Attic Spray Foam Insulation | From $1.50/sq ft | Open-cell roof-deck foam turns an attic that bakes at 140°F in July and freezes in January into conditioned space. The ductwork ends up inside the envelope. Every estimate lists the R-value target; the thickness per pass; the board footage. |
| Closed Cell Spray Foam Insulation | From $1.20/board ft | Two-pound closed-cell foam delivers R-6.5 per inch with its own vapor retarder and real structural stiffening. The right product for basement foundation walls; rim joists; metal buildings and any St. Louis wall where vapor drive flips direction between August and February. |
| Open Cell Spray Foam Insulation | From $0.55/board ft | Half-pound open-cell foam air-seals attics and walls at a friendlier price per board foot. Sound dampening between rooms and flat units comes with it. We spell out where it belongs, and where a basement or cold exterior wall calls for closed cell instead. |
| Wall & Injection Foam Insulation | From $2/sq ft | Injection foam fills closed frame walls through small drilled ports, no demolition. The retrofit answer for post-war frame and brick-veneer ranches with empty cavities. On solid double-brick city homes there is no cavity to fill; we tell you so before anyone drills. |
| Crawl Space Spray Foam Insulation | From $2,500 | Closed-cell foam on crawl space walls and subfloors ends the cold floors of January and the damp air of August. It seals crawl spaces under kitchen additions; sunrooms and enclosed back porches. Moisture problems get fixed first, we never spray over a wet crawl space. |
| Rim Joist & Band Joist Spray Foam | From $650 | Basement rim joists leak more cold air than almost anything in a St. Louis house. Closed cell seals every bay along the top of the foundation, the small-ticket job with the fastest comfort payback. Cantilevers and bonus-room floors are handled the same way. |
| Garage Spray Foam Insulation | From $1,200 | Garage ceilings under bonus rooms and walls shared with the house are foam-sealed against July heat and January cold. Workshop conversions are handled the same way. The difference between a storage box and usable space twelve months a year. |
| Metal Building & Barndominium Spray Foam | From $1.75/sq ft | Closed-cell foam stops a Missouri metal building from sweating in spring and frosting inside in winter. Shops; barndominiums; pole barns and ag buildings sealed against condensation from Franklin County acreage to Earth City warehouses. |
| Commercial & New Construction Spray Foam | Free commercial estimate | Warehouses; offices; churches and production builders served on schedule. Code-compliant assemblies come with documentation your county or city inspector will actually accept. Phased work keeps your operation running from Earth City to the Wentzville corridor. |
| Insulation Removal | From $950 | Old blown-in and batts vacuumed out before any new foam goes in, never buried. We also cut out failed spray foam; the job most installers will not touch. Vermiculite is common in older St. Louis attics and gets flagged for testing; never disturbed. |
| Insulation Replacement & Re-Insulation | From $2,800 | The full reset: old material removed; gaps air-sealed; new foam installed to current code R-values. The right call when insulation is flattened; mouse-fouled; soaked after storm damage or simply twenty years past its job. |
| Air Sealing | From $650 | Top plates; can lights; chimney chases and attic hatches leak more heated and cooled air than most walls. We seal the leaks before insulating, the step that makes every R-value actually perform and the cheapest comfort fix in a St. Louis house. |
What Affects the Price
- Project Size and Square Footage : Larger areas typically benefit from lower per-unit costs. A 1,500 sq ft attic project will have different pricing than a 500 sq ft garage, affecting your total investment.
- Foam Type: Closed Cell vs. Open Cell : Closed cell foam ($1.20/board ft) offers superior R-value and moisture resistance, while open cell foam ($0.55/board ft) is budget-friendly and suitable for interior applications. Your home's needs determine which is best.
- Accessibility and Structural Conditions : Tight attics, finished spaces, or homes requiring extensive prep work may increase labor costs. We assess your space during the free estimate to provide accurate pricing.
- Existing Insulation Removal and Cleanup : If old insulation, debris, or contamination must be removed first (starting at $950), this is factored into your final quote. Proper cleanup ensures optimal foam application.
What's included
- Travel included across the St. Louis area
- Professional labor & equipment
- Old insulation vacuumed out, bagged & hauled away
- Job site cleanup
- Written estimate before work begins
To get an accurate estimate for your St. Louis home, have your square footage ready and be prepared to describe the area you want insulated (attic, crawl space, walls, etc.). Our team will assess accessibility, existing conditions, and your specific goals during a free consultation. Call us at (314) 912-1801 to schedule your estimate and receive a detailed breakdown of materials, labor, and any prep work required.
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Indicative ranges only. Final pricing depends on the thickness and R-value specified, what has to come out first, access, and whether open or closed cell is the right product. Measured on site at the board foot. Minimum job charges apply on small jobs.
Pricing FAQ
Why do spray foam insulation prices vary so much between projects?
Pricing depends on multiple factors: the area's square footage, foam type (closed or open cell), accessibility, labor complexity, and whether existing insulation removal is needed. A straightforward attic project differs significantly from a crawl space with moisture issues or a retrofit requiring extensive air sealing. We provide itemized estimates so you understand exactly what you're paying for.
Is there a minimum project cost?
Yes, smaller projects like rim joist sealing start at $650, while crawl space work begins at $2,500. These minimums reflect the equipment, materials, and labor required. Contact us at (314) 912-1801 to discuss your specific project and confirm whether it meets our service minimums.
Do you offer free estimates?
Absolutely. We provide free, no-obligation estimates for all residential projects in the St. Louis area, including commercial and new construction consultations. Call (314) 912-1801 to schedule your free assessment and receive a detailed quote tailored to your home.
What payment methods do you accept?
We accept standard payment methods including cash, check, and credit cards. For larger projects, we're happy to discuss payment arrangements. Ask about financing options when you call for your estimate at (314) 912-1801.
Are there any hidden fees in your pricing?
No. Our estimates include all costs: materials, labor, equipment, cleanup, and disposal. We're transparent about pricing so you know exactly what to expect. If conditions change during the project, we'll communicate any adjustments upfront.