Spray foam insulation and air sealing are among the most effective ways to improve your home's energy efficiency, comfort, and indoor air quality. Whether you're insulating an attic, sealing a crawl space, upgrading walls, or protecting rim joists, pricing depends on several factors including square footage, foam type, project complexity, and your home's specific needs. We're transparent about costs so you can make an informed decision.
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 foam on the roof deck turns a 150°F Durham attic into conditioned space. The air handler and ductwork that so many Triangle homes run overhead end 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 crawl space walls; daylight basements; metal buildings and anywhere Carolina humidity and red-clay moisture push hardest. |
| 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 comes with it. We spell out where it belongs, and where a Triangle crawl space or basement wall calls for closed cell instead. |
| Wall & Injection Foam Insulation | From $2/sq ft | Injection foam fills closed walls through small drilled ports, no demolition. The retrofit answer for Durham's mill houses; 1920s bungalows and 1950s-60s brick-veneer ranches with empty cavities. Ports go under a siding course or along a mortar joint and are patched to match. |
| Crawl Space Spray Foam Insulation | From $2,500 | Closed-cell foam on crawl space walls and rims holds back humid air over Durham red clay. Moisture is fixed first and we leave the inspection strip your termite bond calls for. |
| Rim Joist & Band Joist Spray Foam | From $650 | Rim joists over daylight basements and crawl spaces leak conditioned air at every framing gap. So do the cantilevered floors of rooms over garages. Closed cell seals them for good, the small-ticket job with the fastest comfort payback in a Durham house. |
| Garage Spray Foam Insulation | From $1,200 | Garage ceilings under bonus rooms are foam-sealed against radiant afternoon heat. Workshop conversions are handled the same way. The difference between a storage oven and usable space. |
| Metal Building & Barndominium Spray Foam | From $1.75/sq ft | Closed-cell foam is the insulation that stops a Carolina metal building from sweating. Shops; barndominiums; pole barns and old tobacco-country ag buildings sealed against condensation from Chatham and Person County acreage to Mebane warehouses. |
| Commercial & New Construction Spray Foam | Free commercial estimate | Warehouses; offices; churches; soundstages and production builders served on schedule. Code-compliant assemblies come with documentation your local inspector will actually accept. Phased work keeps your operation running from Research Triangle Park to Mebane. |
| Insulation Removal | From $950 | Old blown-in and batts vacuumed out before any new foam goes in, never buried. Squirrel and raccoon contamination comes out with it. We also cut out failed spray foam; the job most installers will not touch. Vermiculite 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; rodent-fouled; soaked by a roof leak after tree or storm damage or simply twenty years past its job. |
| Air Sealing | From $650 | Top plates; can lights; chases; knee walls and attic hatches leak more 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 Durham house. |
What Affects the Price
- Project Size and Square Footage : Larger projects typically cost less per unit because setup and equipment costs are spread across more area. A 500 sq ft attic will have different per-square-foot pricing than a 2,000 sq ft space.
- Foam Type: Open Cell vs. Closed Cell : Open cell foam is more affordable (from $0.55/board ft) and works well for interior applications. Closed cell foam costs more (from $1.20/board ft) but offers superior R-value and moisture resistance, making it ideal for basements and exposed areas.
- Site Accessibility and Existing Conditions : Easy-to-access attics cost less than cramped crawl spaces or homes with existing insulation that must be removed first. Structural obstacles, ventilation requirements, and air sealing needs also affect the final price.
- Existing Insulation Removal : If your home has old fiberglass, cellulose, or other insulation that must be removed before spray foam installation, removal services (starting from $950) are added to your project cost.
What's included
- Travel included across the Durham 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 Durham home, call us at (984) 254-5400 with details about the areas you want to insulate, whether you need removal of existing materials, and any specific energy concerns. Our team will discuss your project scope, explain which foam type best suits your needs, and provide a transparent quote that includes all labor, materials, and cleanup.
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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 different projects?
Several factors influence pricing: the size and accessibility of the space, whether existing insulation must be removed, the type of foam selected (open or closed cell), and any additional air sealing work needed. A simple attic project may cost less per square foot than a complex crawl space with moisture concerns. We assess each home individually to provide accurate pricing.
How do I schedule a free estimate with Durham Spray Foam Insulation?
Call us at (984) 254-5400 to book your free estimate. Our team will visit your home, evaluate the project, answer your questions, and provide a detailed quote with no obligation. We serve the Durham area and offer flexible scheduling.
What's included in the starting prices listed on your website?
Starting prices reflect the base cost for materials and labor for each service type. Your final invoice will include the specific scope of work, foam type, square footage, site preparation, cleanup, and any additional services like air sealing or insulation removal. We'll provide a complete itemized estimate before work begins.
Do you offer financing options or payment plans?
We work with homeowners to find solutions that fit their budgets. Contact us at (984) 254-5400 to discuss payment options, financing possibilities, and how we can help make your insulation upgrade affordable.
Is there a minimum project cost for spray foam insulation?
Yes, some projects have minimum costs (for example, rim joist sealing starts at $650 and garage insulation at $1,200) because of equipment setup and travel. For larger projects like attics or crawl spaces, we price based on square footage or board feet. Call (984) 254-5400 to discuss your specific project.