Attic insulation price guide
SFL Attic is a guide run by Terragroupe, LLC. We do not install anything and we are not booking jobs yet.
National price guides list blown-in fiberglass at 1.60-2.40 USD per sq ft1 installed and open-cell spray foam at 3.80-4.95 USD per sq ft1 (PickHVAC, May 2026). For a 1,500 sq ft attic that comes to 2,400-3,600 USD1 for fiberglass and 5,700-7,425 USD1 for open-cell foam (our arithmetic). These are national ranges, not a South Florida quote.
SFL Attic is a guide run by Terragroupe, LLC. We do not install anything and we are not booking jobs yet.
Last reviewed October 18, 2026 against the cited sources. A guide, not legal, tax or engineering advice.
Updated . Sources
Price by attic size and insulation type
This table is our arithmetic. It multiplies each attic size by the low and high price per square foot in PickHVAC's national guide: 1.60-2.40 USD per sq ft1 for blown-in fiberglass, 1.90-2.75 USD per sq ft1 for cellulose, 3.80-4.95 USD per sq ft1 for open-cell foam and 5.35-6.75 USD per sq ft1 for closed-cell foam.
| Insulation type | 1,000 sq ft | 1,500 sq ft | 2,000 sq ft |
|---|---|---|---|
| Blown-in fiberglass | 1,600-2,400 USD1 | 2,400-3,600 USD1 | 3,200-4,800 USD1 |
| Blown-in cellulose | 1,900-2,750 USD1 | 2,850-4,125 USD1 | 3,800-5,500 USD1 |
| Open-cell spray foam | 3,800-4,950 USD1 | 5,700-7,425 USD1 | 7,600-9,900 USD1 |
| Closed-cell spray foam | 5,350-6,750 USD1 | 8,025-10,125 USD1 | 10,700-13,500 USD1 |
Foam is priced on the surface it covers, which is the roof deck. On a pitched roof that is more than the attic floor, so a real foam bid can run higher than its row here.
As a cross-check, Block Renovation (July 2026) lists a typical 1,500 sq ft attic at 2000-4500 USD2 and a 2,000 sq ft attic at 3000-7000 USD2. Your own price needs someone to measure the attic.
Subtract FPL's ceiling rebate of $220 per installation if your attic qualifies 3. The federal 25C credit is over 4. Both are covered under Rebates and credits below.
For your own attic size and R-value, with the gap to the code minimum and a check against the FPL rebate conditions, use the attic cost and gap calculator.
What moves the price of an attic job
- Attic size. Guides price by the square foot of attic floor, so a bigger attic costs more.
- What is already there. Adding to an existing layer costs less per square foot than filling an empty attic 1.
- Old insulation. Removing it adds 1.00-1.50 USD per sq ft5. Wet or contaminated loose-fill should be removed, not covered 2.
- Access and air sealing. A tight attic or a hard hatch can add labor. Some quotes include air sealing, so ask whether yours does.
- Type. Foam costs more than blown-in. The next section compares them.
Blown-in versus spray foam cost
PickHVAC (May 2026) lists open-cell spray foam at 3.80-4.95 USD per sq ft1 and closed-cell at 5.35-6.75 USD per sq ft1.
Block Renovation (July 2026) lists blown-in at 1.00-3.00 USD per sq ft2 and spray foam at 1.50-5.00 USD per sq ft2, without splitting open-cell from closed-cell. Angi (October 2026) lists blown-in at 1-4 USD per sq ft5 and spray foam at 2-5 USD per sq ft5.
At PickHVAC's per-square-foot foam prices, a 1,500 square foot attic comes to about 5700-10125 USD1 (our arithmetic: 1,500 times the low and the high price). A pitched roof deck has more surface than the attic floor, so real bids can differ.
One Broward County contractor's blog lists a typical retrofit at 1700-7500 USD6 for any type. That seller also sells foam, so treat the figure as a cross-check, not a quote.
Want help choosing? Read spray foam vs blown-in in Florida.
Rebates and credits
As of October 18, 2026
FPL's ceiling insulation rebate is $220 per installation, credited on the invoice of an FPL-approved contractor 3. Your existing attic insulation must be below R-8 3. The whole attic must also be open to reach 3. It is one rebate per home every 20 years 3.
Additions and renovations, flat roofs, and insulation over unfinished drop ceilings do not qualify 3.
FPL's page showed the rebate as current on October 18, 2026, with no end date announced 7. Check FPL before you hire anyone.
The federal 25C credit is over 4. It covered only property placed in service on or before December 31, 2025 4. Some older pages still list it, so ignore them.
We found no other insulation rebate we can verify. If someone quotes you one, ask for the program page.
Questions to ask an installer, and how to compare quotes
- Ask for the scope in writing: square feet, product, the R-value to be installed, and who removes old insulation.
- Use the new-home minimum as a yardstick: R-30 in South Florida 8.
- Ask whether the price includes removal, air sealing and photos.
- If a rebate is part of the price, ask the installer to show their FPL approval.
- Check what the code asks for in a new ceiling. The Florida attic insulation code guide explains the minimum and the edition dates.
How this guide is kept current
The Updated date at the top is the date of the last review. Every figure comes from a source listed under Sources, with its own date, and every table cell shows its inputs.
Change log: added the answer box and the price table by attic size.
National price ranges for attic insulation
| Job | Range | Source |
|---|---|---|
| FSEC: in the Southeast a radiant barrier can reasonably take 8-12 percent off annual cooling costs (worked example: 1,500 sq ft Central Florida house); benefit shrinks with more insulation: at R-30 or better there is very little heat flow left for a barrier to block | 8-12 percent of cooling cost | [21] |
| Blown-in fiberglass, full depth, installed | 1.60-2.40 USD per sq ft | [1]National price guide range, Attic Insulation Cost and Guide 2026 - PICKHVAC, May 2026 |
| Blown-in cellulose, full depth, installed | 1.90-2.75 USD per sq ft | [1]National price guide range, Attic Insulation Cost and Guide 2026 - PICKHVAC, May 2026 |
| Open-cell spray foam (envelope), installed | 3.80-4.95 USD per sq ft | [1]National price guide range, Attic Insulation Cost and Guide 2026 - PICKHVAC, May 2026 |
| Closed-cell spray foam (envelope), installed | 5.35-6.75 USD per sq ft | [1]National price guide range, Attic Insulation Cost and Guide 2026 - PICKHVAC, May 2026 |
| Blown-in, typical 1,500 sq ft attic, total | 1875-4125 USD | [1]National price guide range, Attic Insulation Cost and Guide 2026 - PICKHVAC, May 2026 |
| Blown-in fiberglass 1.00-2.50 and cellulose 1.20-3.00 per sq ft installed | 1.00-3.00 USD per sq ft | [2]National price guide range, How Much Does Attic Insulation Cost? 2026 Guide, July 2026 |
| Spray foam (open and closed not split) | 1.50-5.00 USD per sq ft | [2]National price guide range, How Much Does Attic Insulation Cost? 2026 Guide, July 2026 |
| Typical 1,500 sq ft attic, total | 2000-4500 USD | [2]National price guide range, How Much Does Attic Insulation Cost? 2026 Guide, July 2026 |
| Typical 2,000 sq ft attic, total | 3000-7000 USD | [2]National price guide range, How Much Does Attic Insulation Cost? 2026 Guide, July 2026 |
| Removing old attic insulation: Angi and HomeAdvisor both list $1 to $1.50 per square foot (Angi also adds air sealing at $250 to $750). | 1.00-1.50 USD per sq ft | [5]National price guide range, How Much Does Attic Insulation Cost? [2026 Data] (Angi), October 2026 |
| Contractor blog: open-cell 1.50-3.50 and closed-cell 2.00-4.75 per sq ft in Florida 2026; typical attic retrofit 1,700-7,500 | 1700-7500 USD | [6]National price guide range, Florida Spray Foam Insulation: Costs, Climate & Building Code Guide (2026), June 2026 |
| Spray foam, 1,500 sq ft at 3.80-6.75 per sq ft (PickHVAC envelope prices); 2,000 sq ft shown in note | 5700-10125 USD | [1]National price guide range, Attic Insulation Cost and Guide 2026 - PICKHVAC, May 2026 |
| Angi: blown-in attic insulation costs $1 to $4 per square foot (table 'Average Cost Per Square Foot in 2026'); national average attic $2,100, most homeowners $1,700 to $2,500.National range from a price guide, not a local quote. | 1-4 USD per sq ft | [5]National price guide range, How Much Does Attic Insulation Cost? [2026 Data] (Angi), October 2026 |
| Angi: spray foam attic insulation costs $2 to $5 per square foot (no open-cell / closed-cell split).National range from a price guide, not a local quote. | 2-5 USD per sq ft | [5]National price guide range, How Much Does Attic Insulation Cost? [2026 Data] (Angi), October 2026 |
| HomeGuide: blown-in insulation costs $0.90 to $2.40 per square foot, or $900 to $3,600 total.National range from a price guide, not a local quote. | 0.90-2.40 USD per sq ft | [22]National price guide range, How Much Does Attic Insulation Cost? (HomeGuide), January 2026 |
| HomeGuide: attic spray foam insulation costs $1.50 to $5.00 per square foot.National range from a price guide, not a local quote. | 1.50-5.00 USD per sq ft | [22]National price guide range, How Much Does Attic Insulation Cost? (HomeGuide), January 2026 |
| HomeAdvisor: removing old attic insulation costs $1 to $1.50 per square foot.National range from a price guide, not a local quote. | 1.00-1.50 USD per sq ft | [23]National price guide range, How Much Does It Cost to Insulate an Attic? (HomeAdvisor), June 2026 |
| Angi: contractors charge between $0.60 and $1 per square foot to install both foil and spray-on radiant barriers.National range from a price guide, not a local quote. | 0.60-1.00 USD per sq ft installed | [24]National price guide range, How Much Does a Radiant Barrier Cost to Install? [2026 Data] (Angi), October 2026 |
| Angi: professional radiant barrier installation costs between $710 and $2,840 for the project.National range from a price guide, not a local quote. | 710-2840 USD | [24]National price guide range, How Much Does a Radiant Barrier Cost to Install? [2026 Data] (Angi), October 2026 |
Facts used in this guide
As of October 18, 2026
| Fact | Value | Source |
|---|---|---|
| Current Florida Building Code, Energy Conservation is the 8th Edition (2023), effective December 31, 2023 (based on 2021 IECC) | 8th Edition (2023) | [8] December 31, 2023As of October 19, 2026 |
| Florida Building Code 9th Edition (2026) takes effect December 31, 2026; permit applications on/after that date follow it | 2026-12-31 date | [10] 2026As of October 19, 2026 |
| Florida Building Code 9th Edition (2026) applies to permit applications filed on or after December 31, 2026 | 9th Edition (2026)Takes effect December 31, 2026 | [10] 2026As of October 19, 2026 |
| Prescriptive minimum ceiling insulation, Climate Zone 1, FBC Energy Conservation 8th Ed. Table R402.1.2 | 30 R-value (U-0.035) | [8] December 31, 2023As of October 19, 2026 |
| Prescriptive minimum ceiling insulation, Climate Zone 2 (not South Florida), 8th Ed. | 38 R-value (U-0.030) | [11] 2023 |
| Miami-Dade, Broward and Palm Beach counties are all Climate Zone 1A in the FBC Energy Conservation 8th Edition (Palm Beach moved from Zone 2 to Zone 1) | Zone 1 climate zone | [12] 2023 |
| Existing-building alterations: R503.1 says alterations comply with new-construction rules; R503.1.1 exceptions include existing ceiling/wall/floor cavities that are not exposed (and exposed cavities filled with insulation), provided the building's energy use is not increased | text code text | [13] 2023 |
| F.S. 553.9065: unvented attic assemblies insulated with at least R-20 air-impermeable insulation are deemed to meet the energy code if blower door is below 3 ACH50, mechanical ventilation is present, exposed rafters have R-3 where applicable, and HVAC equipment/ducts are inside the envelope | 20 R-value | [14] 2026 (2026 Florida Statutes online edition) |
| Florida HB 803 (signed May 2026, effective July 1, 2026): single-family owners and their contractors do not need a building permit for work valued under $7,500; structural, electrical, plumbing, mechanical and gas work still needs one; projects cannot be split; a written request is required | $7,500 USD | [15] May 8, 2026As of October 19, 2026 |
| FPL residential ceiling insulation rebate | 220 USD per installation | [3] 2025-09-01 (program standards effective date) |
| Eligibility: active FPL residential account, whole-house central electric AC and heating, verified existing ceiling R-value below R-8, all attic spaces accessible, hired PIC, once per home every 20 years | below R-8 R-value | [3] September 1, 2025 |
| Not eligible: additions or renovations, inaccessible attics, flat roofs, insulation over unfinished drop ceilings; material may be blown-in, batt or spray foam and must be new | n/a | [3] September 1, 2025 |
| FPL ceiling insulation rebate is current in October 2026 with no announced end date | open status | [7] October 18, 2026 |
| Federal 25C Energy Efficient Home Improvement Credit ended for property placed in service after December 31, 2025; nothing for 2026 installs unless Congress changes the law | ended 2025-12-31 date | [4] October 18, 2026As of October 19, 2026 |
| Florida Building Code, Energy Conservation, 9th Edition (2026): the Commission's Form R402-2026 lists a ceiling R-value requirement of 30 for Climate Zone 1 (the zone the 8th Edition assigns to Miami-Dade, Broward and Palm Beach counties)Takes effect with the 9th Edition on December 31, 2026; the 8th Edition value for new construction is also R-30. | 30 R-valueTakes effect December 31, 2026 | [16] August 14, 2026 |
| Florida Building Code, Energy Conservation, 9th Edition (2026): the Commission's Form R402-2026 lists a ceiling R-value requirement of 38 for Climate Zone 2 (not South Florida) | 38 R-valueTakes effect December 31, 2026 | [16] August 14, 2026 |
| The Commission's 9th Edition change analysis lists these Table R402.1.2 changes for Climate Zones 1 and 2: maximum skylight U-factor cut from 0.75 to 0.60 in Zone 1, skylight SHGC set at 0.28, new cavity-plus-continuous insulation options for wood-frame walls and floors, and a new heated-slab column | skylight U 0.75 to 0.60; skylight SHGC 0.28Takes effect December 31, 2026 | [17] 2026 |
| 9th Edition Table R402.4.1.1 (air barrier and insulation installation, ceiling/attic) adds gasketing for attic access openings, drop-down stairs and knee-wall doors, requires access hatches and doors to be insulated per R402.2.4, and requires eave baffles per R402.2.3 | gasketed attic access; eave bafflesTakes effect December 31, 2026 | [17] 2026 |
| Florida Building Code, Residential (8th Edition, 2023) R806.2: the minimum net free ventilating area of an attic is 1/150 of the area of the vented space | 1/150 ratio of vented space area | [18] 2023 |
| FBC Residential R806.2 exception: the ratio may be 1/300 of the vented space if at least 40 percent and no more than 50 percent of the required vent area is high in the attic (ventilators not more than 3 feet below the ridge) and the rest is in the bottom third of the attic space | 1/300 with 40-50% upper vents ratio / percent | [18] 2023 |
| FBC Residential R806.3: where eave or cornice vents are installed, blocking, bridging and insulation must not block the free flow of air, with at least a 1-inch space kept between the insulation and the roof sheathing at the vent | 1 inch | [18] 2023 |
| The Commission's 9th Edition Residential change analysis lists one roof ventilation change in Chapter 8: R806.5 (unvented attics) now sets the vapor diffusion port at 1/150 or more of the ceiling area; it also adds R903.5, which sends attic ventilation to R806.1 through R806.4 | R806.5 port >= 1/150 of ceiling areaTakes effect December 31, 2026 | [19] 2026 |
| FBC Energy Conservation (8th Edition) R503.1.1: building envelope assemblies that are part of an alteration must meet R402.1.2 or R402.1.4 and sections R402.2.1 through R402.2.13 (R402.2.1 covers ceilings with attic spaces); listed exceptions apply if the building's energy use is not increased, including existing cavities that are not exposed | R503.1.1 code section | [13] 2023 |
| FBC Building (8th Edition) 105.1: an owner who intends to construct, enlarge, alter, repair, move, demolish or change the occupancy of a building, or to install or replace an electrical, gas, mechanical or plumbing system, must first apply to the building official and obtain the required permit | 105.1 code section | [20] 2023 |
Cities we cover in South Florida
Attic Heat Score
Answer a few quick questions. The score shows how likely your attic is to benefit from more insulation. It is a starting point; a measured depth confirms it.
Start the Attic Heat ScoreSFL Attic is a guide run by Terragroupe, LLC. We do not install anything and we are not booking jobs yet.
Questions people ask
How much does attic insulation cost in South Florida?
Block Renovation (July 2026) puts a typical 1,500 square foot attic at 2000-4500 USD2 and a 2,000 square foot attic at 3000-7000 USD2 for blown-in. These are national guides, not South Florida quotes. A real price needs someone to measure your attic.
Is spray foam worth the extra cost in Florida?
It depends on your house. Foam on the roof deck can seal the attic, and Florida's wind-mitigation form lists it as one way to qualify for a sealed roof deck 9. Some inspectors dislike it because it can hide roof leaks. Blown-in is enough for many attics. See the comparison guide.
Does removal add to the cost?
Yes, when old insulation has to go. Guides list removal at 1.00-1.50 USD per sq ft5. Suspect asbestos or vermiculite? Stop. That needs a licensed abatement contractor, and we do not handle it.
Sources
- Attic Insulation Cost and Guide 2026 - PICKHVAC, May 15, 2026
- How Much Does Attic Insulation Cost? 2026 Guide, July 21, 2026
- FPL residential ceiling insulation program standards, September 1, 2025
- IRS, Energy Efficient Home Improvement Credit, October 18, 2026
- How Much Does Attic Insulation Cost? [2026 Data] (Angi), October 12, 2026
- Florida Spray Foam Insulation: Costs, Climate & Building Code Guide (2026), June 16, 2026
- FPL ceiling insulation rebate page, October 18, 2026
- Florida Building Code, Energy Conservation, 8th Edition (2023), Table R402.1.2, December 31, 2023
- Florida Office of Insurance Regulation, Uniform Mitigation Verification Inspection Form OIR-B1-1802 (Rev. 04/26), 2026-04
- Important Notice: Florida Building Code 9th Edition Code Change (Miami-Dade Permitting and Inspection Center), 2026
- Appendix RD Forms: Residential Building Thermal Envelope Approach (8th Edition FBC Energy Conservation), 2023
- Chapter 3 [RE] General Requirements: 2023 FBC - Energy Conservation, 8th edition | UpCodes, 2023
- Chapter 5 [RE] Existing Buildings: 2023 FBC - Energy Conservation, 8th edition | UpCodes, 2023
- Online Sunshine, Florida Statutes: s. 553.9065, 2026 (2026 Florida Statutes online edition)
- A new Florida law will drop permits for low-cost home projects | WLRN, May 8, 2026
- Form R402-2026, Residential Building Thermal Envelope Approach (EnergyGauge USA 9.0.00 report posted by the Florida Building Commission, Energy TAC, September 2026 meeting folder), August 14, 2026
- Analysis of Changes for the 9th Edition (2026) Florida Codes: Energy Conservation, Residential (Florida Building Commission), 2026
- Chapter 8 Roof-Ceiling Construction: 2023 FBC - Residential, 8th edition | UpCodes, 2023
- Analysis of Changes for the 9th Edition (2026) Florida Codes: Residential (Florida Building Commission), 2026
- Chapter 1 Scope and Administration: 2023 FBC - Building, 8th edition | UpCodes, 2023
- Radiant Barriers: A Question and Answer Primer (FSEC-EN-15), 2005 (copyright year; revisions undated)
- How Much Does Attic Insulation Cost? (HomeGuide), January 13, 2026
- How Much Does It Cost to Insulate an Attic? (HomeAdvisor), June 20, 2026
- How Much Does a Radiant Barrier Cost to Install? [2026 Data] (Angi), October 14, 2026