Attic insulation in Boca Raton
SFL Attic is a guide run by Terragroupe, LLC. We do not install anything and we are not booking jobs yet.
Boca Raton is a city of eighties and nineties homes: the median build year is 19831, and 81.4 percent1 of units date to 1999 or earlier. The question is what each attic holds, and age alone cannot say. A measured depth can, so compare yours with the new-home minimum of R-30 2.
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 Boca Raton
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 Boca Raton
Also close by: Highland Beach (4 mi), Deerfield Beach (4 mi), Delray Beach (6 mi), Hillsboro Pines (6 mi), Lighthouse Point (6 mi), Hillsboro Beach (7 mi),
Straight-line distances in miles, from our place registry from Census Gazetteer centroids.
Mostly mid-age, with a long tail
Boca Raton has 49,128 housing units1. Only 43.6 percent1 were built in 1979 or earlier, but 69 percent1 were built in 1989 or earlier.
That makes the typical Boca attic younger than the typical Miami one. Only a measurement tells what any one attic holds.
ZIP areas differ. ZIP area 33486 has a median build year of 1977 3, with 58.8 percent3 of units from 1979 or earlier. ZIP areas 33496 and 33498 are newer: both have a median of 1991 4, and only 5.6 percent4 and 5 percent5 of units date to 1979 or earlier.
Reading the Boca Raton ZIP list
Most Boca Raton ZIP areas have a median build year in the early eighties. ZIP area 33433 sits at 19856 and ZIP area 33434 at 19837.
In ZIP area 33434, 97 percent7 of units were built by 1999. In ZIP area 33433 it is 93.7 percent6. A home from that stretch is old enough to have settled insulation and young enough to have had some from the start.
Heat: what we can and cannot say
We have no weather-station normal for Boca Raton, so we show no cooling figure for it. We do not borrow a number from another city. Nearby stations show very little heating need, so the job here is the same as in the rest of South Florida: keep heat out.
Who owns the roof?
The share of detached houses swings widely from one Boca Raton ZIP area to the next. ZIP area 33432 has 22.5 percent8. ZIP area 33498 has 88.4 percent5.
Where detached houses are rare, expect shared roofs and association rules. Where they are common, the attic is more likely to be yours to insulate.
What to check in Boca Raton
- Settled or uneven layers. Look for settled, thin or patchy insulation. Compare its depth with R-30, the new-home minimum 2.
- Permit. The City of Boca Raton's permit guide does not mention insulation. Ask the building division whether your job needs a permit before you hire anyone.
- HOA or condo rules. If your home is in an HOA or condo community, ask about roof and attic access first.
- Rebate. If FPL is your electric company, read its ceiling insulation rebate rules. The rebate needs existing attic insulation below R-8 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 | [10] |
| Blown-in fiberglass, full depth, installed | 1.60-2.40 USD per sq ft | [11]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 | [11]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 | [11]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 | [11]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 | [11]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 | [12]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 | [12]National price guide range, How Much Does Attic Insulation Cost? 2026 Guide, July 2026 |
| Typical 1,500 sq ft attic, total | 2000-4500 USD | [12]National price guide range, How Much Does Attic Insulation Cost? 2026 Guide, July 2026 |
| Typical 2,000 sq ft attic, total | 3000-7000 USD | [12]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 | [13]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 | [14]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 | [11]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 | [13]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 | [13]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 | [15]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 | [15]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 | [16]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 | [17]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 | [17]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
Boca Raton facts that shape the job
| Fact | Value | Source |
|---|---|---|
| Median year structure built, Boca Raton, FL (B25035) | 1983 | [1] 2020-2024 |
| Share of housing units built 1979 or earlier, Boca Raton, FL (B25034 bins 1970-79 and older) | 43.6 percent | [1] 2020-2024 |
| Share of housing units built 1989 or earlier, Boca Raton, FL (B25034) | 69 percent | [1] 2020-2024 |
| Share of housing units built 1999 or earlier, Boca Raton, FL (B25034) | 81.4 percent | [1] 2020-2024 |
| Total housing units, Boca Raton, FL (B25034 total) | 49,128 housing units | [1] 2020-2024 |
| Share of housing units that are single-family detached, ZCTA 33432 (B25024) | 22.5 percent | [8] 2020-2024 |
| Median year structure built, ZCTA 33433 (B25035) | 1985 | [6] 2020-2024 |
| Share of housing units built 1999 or earlier, ZCTA 33433 (B25034) | 93.7 percent | [6] 2020-2024 |
| Median year structure built, ZCTA 33434 (B25035) | 1983 | [7] 2020-2024 |
| Share of housing units built 1999 or earlier, ZCTA 33434 (B25034) | 97 percent | [7] 2020-2024 |
| Share of housing units built 1979 or earlier, ZCTA 33486 (B25034 bins 1970-79 and older) | 58.8 percent | [3] 2020-2024 |
| Share of housing units built 1979 or earlier, ZCTA 33496 (B25034 bins 1970-79 and older) | 5.6 percent | [4] 2020-2024 |
| Share of housing units built 1979 or earlier, ZCTA 33498 (B25034 bins 1970-79 and older) | 5 percent | [5] 2020-2024 |
| Share of housing units that are single-family detached, ZCTA 33498 (B25024) | 88.4 percent | [5] 2020-2024 |
Sources
- U.S. Census Bureau ACS 2020-2024 5-year estimates via Census Reporter: Boca Raton city, FL, 2020-2024
- Florida Energy Conservation Code 2023 (UpCodes viewer), 2023
- 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 33498, 2020-2024
- U.S. Census Bureau ACS 2020-2024 5-year estimates via Census Reporter: ZIP Code Tabulation Area 33433, 2020-2024
- U.S. Census Bureau ACS 2020-2024 5-year estimates via Census Reporter: ZIP Code Tabulation Area 33434, 2020-2024
- U.S. Census Bureau ACS 2020-2024 5-year estimates via Census Reporter: ZIP Code Tabulation Area 33432, 2020-2024
- FPL residential ceiling insulation program standards, September 1, 2025
- 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
My Boca Raton house was built in the eighties or nineties. Does it need more insulation?
Maybe. Today's new-home minimum is R-30 2. We found no survey of real attic R-values by year built, so we do not guess what an eighties or nineties attic holds. Measuring your own attic is the only way to know.