Attic insulation in Miami
SFL Attic is a guide run by Terragroupe, LLC. We do not install anything and we are not booking jobs yet.
Miami has the oldest housing of the cities we cover, with a median build year of 19791 and 50.8 percent1 of units built in 1979 or earlier. Only 22.4 percent1 are single-family detached houses, so check who controls your roof before you plan work. A measured depth tells you what sits above your ceiling.
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.
Updated . Sources
What this site gives you now
This guide is built to remove guesswork, so you can decide from a straight answer with no pressure.
- A way to size up your attic
The Attic Heat Score shows how likely new insulation is to help. Then find the type of insulation, how deep it is and what needs fixing first. - Prices you can compare
Price ranges come from named national guides, each with its source. Ask any installer for the scope, the product and the price in writing. Nothing should start until you say yes. - The right product for your house
Blown-in when it is enough. Spray foam only when it fits your roof and your budget. - A photo habit
Take photos of the attic before and after any work, with a ruler for depth, so you can see the result. - The rebate rules
FPL pays a rebate only when your existing attic insulation is thin. The cost guide explains the rules, so you can see whether you may qualify. - What to ask for in writing
Ask any installer to put the workmanship term in your written scope: what it covers and how long it lasts. We will publish an installer's term on this site if one signs.
This site is free to read. It sells no work and takes no payment. If your attic does not need work, the guides and the score will say so. Any work is agreed in writing between you and the installer who does it.
Services in Miami
Illustration Blown-in attic insulation
Loose fill blown across the attic floor. The usual fix for a thin layer in a dry, open attic.
Illustration Spray foam attic insulation
Foam on the roof deck that seals the attic. It costs more and fits homes with ducts in the attic.
Attic insulation removal
Takes out wet, soiled or old insulation so new insulation starts on a clean floor.
Radiant barrier
Reflective foil that turns roof heat back. It helps most where attic insulation is thin.
How to size up your attic
- Take the Attic Heat Score. Answer a few questions about your home. You get a score and the reasons behind it. It is a starting point, and the Attic Heat Score page shows what it is based on.
- Know what a good check covers. A good attic check records the type of insulation, its depth in inches and photos of problem spots. Use that list when you talk to any installer.
- Ask for a written price. Ask for the scope, the product, the installed R-value and the price in writing. Nothing should start until you say yes.
- Compare and decide. Use the cost guide to compare quotes. If your attic already has enough insulation, you may not need work.
- See the finished job. Ask for photos and a depth reading after the work, so you can see the result.
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.
Near Miami
Also close by: Brownsville (4 mi), Fisher Island (4 mi), Miami Beach (5 mi), Gladeview (5 mi), El Portal (6 mi), West Miami (6 mi),
Straight-line distances in miles, from our place registry from Census Gazetteer centroids.
Old buildings, few detached houses
The Census counts 223,826 housing units1 in Miami, and the median one was built in 19791. Of those units, 58.1 percent1 were built in 1989 or earlier, and 63.6 percent1 in 1999 or earlier.
Some Miami ZIP areas are older still. In ZIP area 33165, the median build year is 1965 2, 81.1 percent2 of units date to 1979 or earlier, and 74.9 percent2 are detached houses. In 33155 the median is 1959 3 and 66.4 percent3 are detached houses.
ZIP areas are Census approximations and can spill past city limits. Areas with more detached houses are more likely to have an attic that is yours alone to insulate.
The oldest Miami blocks
A pair of ZIP areas stand out in our data. ZIP area 33145 has a median build year of 19564, and 72.8 percent4 of its units date to 1979 or earlier. About half of them, 51.3 percent4, are detached houses.
ZIP area 33135 is older still on paper, with a median build year of 19605. Only 19.7 percent5 of its units are detached houses, so many roofs are shared.
Old age does not prove a thin attic. It tells you where a measured depth is most worth getting.
A long cooling season
Miami International Airport logs 4,656 cooling degree days in a normal year and only 103.6 heating degree days (NOAA normals for 1991 to 2020) 6.
Cooling is the whole story here. Attic insulation in Miami is about keeping heat out of the rooms you pay to cool.
Storm season and your roof
The Atlantic hurricane season runs from June 1 to November 30 7. Building America guidance says roof vents are one of the most common ways rain gets into an attic in a storm 8.
So ask any installer how the job will treat your vents. Do it before the season starts, not during it.
What to check in Miami
- Who controls the roof. In a condo or townhouse, ask your association before you plan work.
- Permit. Ask the City of Miami building department whether your job needs one. We found no city page that says yes or no.
- Quotes to compare. Get the scope, the product, the installed R-value and the workmanship term in writing. Then compare the R-value with R-30, the new-home minimum 9.
Guides
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 | [11] |
| Blown-in fiberglass, full depth, installed | 1.60-2.40 USD per sq ft | [12]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 | [12]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 | [12]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 | [12]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 | [12]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 | [13]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 | [13]National price guide range, How Much Does Attic Insulation Cost? 2026 Guide, July 2026 |
| Typical 1,500 sq ft attic, total | 2000-4500 USD | [13]National price guide range, How Much Does Attic Insulation Cost? 2026 Guide, July 2026 |
| Typical 2,000 sq ft attic, total | 3000-7000 USD | [13]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 | [14]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 | [15]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 | [12]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 | [14]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 | [14]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 | [16]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 | [16]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 | [17]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 | [18]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 | [18]National price guide range, How Much Does a Radiant Barrier Cost to Install? [2026 Data] (Angi), October 2026 |
Evidence: the facts and sources behind this page
Miami facts that shape the job
| Fact | Value | Source |
|---|---|---|
| Median year structure built, Miami, FL (B25035) | 1979 | [1] 2020-2024 |
| Share of housing units built 1979 or earlier, Miami, FL (B25034 bins 1970-79 and older) | 50.8 percent | [1] 2020-2024 |
| Share of housing units built 1989 or earlier, Miami, FL (B25034) | 58.1 percent | [1] 2020-2024 |
| Share of housing units built 1999 or earlier, Miami, FL (B25034) | 63.6 percent | [1] 2020-2024 |
| Share of housing units that are single-family detached, Miami, FL (B25024) | 22.4 percent | [1] 2020-2024 |
| Total housing units, Miami, FL (B25034 total) | 223,826 housing units | [1] 2020-2024 |
| Median year structure built, ZCTA 33135 (B25035) | 1960 | [5] 2020-2024 |
| Share of housing units that are single-family detached, ZCTA 33135 (B25024) | 19.7 percent | [5] 2020-2024 |
| Median year structure built, ZCTA 33145 (B25035) | 1956 | [4] 2020-2024 |
| Share of housing units built 1979 or earlier, ZCTA 33145 (B25034 bins 1970-79 and older) | 72.8 percent | [4] 2020-2024 |
| Share of housing units that are single-family detached, ZCTA 33145 (B25024) | 51.3 percent | [4] 2020-2024 |
| Share of housing units that are single-family detached, ZCTA 33155 (B25024) | 66.4 percent | [3] 2020-2024 |
| Share of housing units built 1979 or earlier, ZCTA 33165 (B25034 bins 1970-79 and older) | 81.1 percent | [2] 2020-2024 |
| Share of housing units that are single-family detached, ZCTA 33165 (B25024) | 74.9 percent | [2] 2020-2024 |
Sources
- U.S. Census Bureau ACS 2020-2024 5-year estimates via Census Reporter: Miami city, FL, 2020-2024
- U.S. Census Bureau, American Community Survey 5-year estimates 2020-2024 (via Census Reporter), 2020-2024
- U.S. Census Bureau, American Community Survey 5-year estimates 2020-2024 (via Census Reporter), 2020-2024
- U.S. Census Bureau ACS 2020-2024 5-year estimates via Census Reporter: ZIP Code Tabulation Area 33145, 2020-2024
- U.S. Census Bureau ACS 2020-2024 5-year estimates via Census Reporter: ZIP Code Tabulation Area 33135, 2020-2024
- NOAA NCEI climate normals 1991-2020 (annual station file), 1991-2020
- NOAA National Hurricane Center: Tropical Cyclone Climatology, 2026
- Disaster-Resistant Roof Venting, Building America Solution Center, December 5, 2022
- Florida Energy Conservation Code 2023 (UpCodes viewer), 2023
- Florida Energy Conservation Code 2023 (UpCodes viewer), 2023
- Radiant Barriers: A Question and Answer Primer (FSEC-EN-15), 2005 (copyright year; revisions undated)
- Attic Insulation Cost and Guide 2026 - PICKHVAC, May 15, 2026
- How Much Does Attic Insulation Cost? 2026 Guide, July 21, 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
- 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
Questions people ask
Can I add attic insulation to a Miami condo or townhouse?
Often the roof and attic are shared, so start with your association. Only 22.4 percent1 of Miami's units are single-family detached houses. If your unit has its own attic space, the same steps apply.