Photo: Adrian Tync · CC BY-SA 4.0 · Source
Supply and install EPS or XPS polystyrene foam board insulation (1-2 in) on walls, foundation or under slab, with adhesive/fasteners and taped seams.
Polystyrene Insulation typically costs $1.50 to $4 per sq ft (national average as of 2026). Most straightforward jobs start near $1.50 per sq ft. Final pricing depends on material quality, project scope, local labor rates, and site conditions. Use our free calculator below for a personalized estimate.
Quality Level
Estimated Total Cost
200 sq ft • Standard Quality
National average — enter your ZIP for local prices.
Estimates are approximate and vary by location, project scope, and current market conditions. Contact a local contractor for an accurate quote.
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$1.28 – $3.40 per sq ft
1-1/2 in. white EPS foam board (around R-6), adhesive and fasteners, seams taped
$1.50 – $4 per sq ft
1-1/2 in. graphite EPS foam board (around R-7), adhesive and fasteners, seams taped
$1.88 – $5 per sq ft
1-1/2 in. higher-density graphite EPS (around R-7), adhesive and fasteners, seams taped, edges and penetrations sealed
| Component | Category | Low | High | Unit |
|---|---|---|---|---|
| Materials | material | $0.67 | $1.80 | sq ft |
| Labor | labor | $0.53 | $1.40 | sq ft |
| Supplies & Other | supplies | $0.18 | $0.48 | sq ft |
| Equipment & Disposal | equipment | $0.12 | $0.32 | sq ft |
Supply and install EPS or XPS polystyrene foam board insulation (1-2 in) on walls, foundation or under slab, with adhesive/fasteners and taped seams.
Typical polystyrene insulation pricing range per sq ft.
Starting price $1.50 per sq ft. National average as of 2026. This is a directional range. Final pricing depends on scope, materials, access, and local labor rates.
Estimates are approximate and vary by location, project scope, and current market conditions. Contact a local contractor for an accurate quote.
Polystyrene Insulation usually lands between $1.50 to $4 per sq ft. That range reflects current national calculator data after materials, labor, supplies, equipment, and disposal are rolled together. Your real quote will move based on quantity, site conditions, finish level, and contractor availability in your ZIP code.
Supply and install EPS or XPS polystyrene foam board insulation (1-2 in) on walls, foundation or under slab, with adhesive/fasteners and taped seams.
Material selections can move the budget faster than anything else, with current material allowances landing around $0.67 to $1.80 per sq ft.
Labor complexity is the next major swing factor, with installation or trade time currently averaging $0.53 to $1.40 per sq ft.
Smaller consumables still matter, because supplies are contributing about $0.18 to $0.48 per sq ft.
Specialty tools, access equipment, cleanup, and disposal can add another $0.12 to $0.32 per sq ft.
Scope changes, premium finishes, difficult access, demolition, and permit requirements can push the total toward the high end of the range. Cleaner access, standard finishes, and bundled work often keep the job closer to the low end.
Get multiple itemized bids, ask contractors to separate materials from labor, and confirm what is included before you compare totals. Scheduling during a slower season and bundling adjacent work can also reduce mobilization costs.
Keep specifications tight before work starts. Change orders are one of the fastest ways to blow past the original budget, especially when material lead times or specialty trades are involved.
DIY can make sense when you already own the tools, understand the prep requirements, and can tolerate schedule risk. Hiring a pro is usually the better move when mistakes would affect finish quality, code compliance, waterproofing, structural performance, or warranty coverage.
View local pricing for polystyrene insulation across 51 states.
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Cost guides for property owners. Contractor ID for the shops who do the work.
Expanded polystyrene insulation boards fixed to an exterior wall with dowels
Photo: Adrian Tync · CC BY-SA 4.0 · Source
Find a pro to do thisSamples of white and graphite-grey EPS foam insulation board
Photo: Energieeffiziente Dämmstoffe · CC0 · Source
Find a pro to do thisClose-up of the cut edge of graphite EPS foam insulation board
Photo: Cjp24 · CC BY-SA 4.0 · Source
Find a pro to do thisRigid polystyrene foam boards installed on a building exterior wall
Photo: Manforowicz · CC0 · Source
Find a pro to do thisUse the calculator range of $1.50 to $4 per sq ft as your baseline, then compare that against the time, tool rentals, material waste, and rework risk you would take on by doing the project yourself.
Most polystyrene insulation jobs start with site review, measurements, and material confirmation. From there the crew usually handles preparation, core installation or repair work, cleanup, and a final walkthrough to confirm the finished scope matches the quote.
Ask each contractor how they handle protection of adjacent finishes, debris removal, and change approvals. Those three points tend to separate a clean project from an expensive headache.