A typical 1,000 square foot attic costs about $800 to $1,700 in cellulose bags if you blow it in yourself, and about $1,400 to $2,500 if a crew does it. Those two ranges overlap far more than you'd guess. This guide prices both routes at R-38 and R-49, then lists the extras that move a quote.
One thing before the numbers. I don't have an invoice of my own to show you, and I'm not going to invent one. Every figure below is published 2026 pricing with the source named, so you can check it against your local quotes.
What Do the Published 2026 Prices Say?
Start with the professional side. CurrentCost's 2026 attic guide, dated August 14, prices blown-in cellulose at $1.40 to $2.50 per square foot installed, against $0.90 to $1.60 for fiberglass batts. Labor runs $40 to $95 an hour, crews are usually two to four people, and the whole labor component lands between $1,000 and $4,000 depending on the job. Regional swings of 10 to 25 percent are normal, with coastal markets above rural ones.
Now the do-it-yourself side. A 25 pound bag of Greenfiber cellulose sells for about $15.97 at the big-box stores, and CraftedCalcs' 2026 retailer survey puts the realistic range at $14 to $18 at Home Depot and $15 to $22 at Lowe's. Coverage per bag falls as the R-value rises, because you're stacking more depth on the same floor:
| Target | Coverage per bag | Bags for 1,000 sq ft (10% spare) | Bag cost, $14-$22 |
|---|---|---|---|
| R-38 | about 19.0 sq ft | about 58 | $812 to $1,276 |
| R-49 | about 14.1 sq ft | about 78 | $1,092 to $1,716 |
At the $15.97 shelf price, that's roughly $926 for R-38 and $1,246 for R-49. Notice what that does. The material is the bulk of the money. Cellulose is cheap per pound, but you need a lot of pounds.
How Deep Does the Layer Have to Be?
ENERGY STAR describes common insulation types as delivering around R-3 to R-3.5 per inch. Do the division and R-38 is about 11 to 13 inches, while R-49 is 14 to 16. That's a lot of fluff, and it's the reason the bag counts above climb so fast.
Cellulose also settles. The Department of Energy's insulation fact sheet notes that some materials need extra initial thickness to offset eventual settling, so the bag label lists a deeper installed thickness than the final R-value implies. Follow the label's chart, not a ruler and a guess.
Which target should you pick? That depends on your climate zone, and ENERGY STAR's attic page is the place to look yours up. I priced R-38 and R-49 because they're the two columns most retailer coverage charts and cost guides use.
DIY or Crew: Where Does the Money Actually Go?
Run the 1,000 square foot R-49 case both ways.
- DIY: $1,092 to $1,716 for bags, and the blower is free for 24 hours at both Home Depot and Lowe's when you buy 20 or more bags of loose-fill cellulose. You'll clear that threshold easily.
- Crew: $1,400 to $2,500 at the 2026 per-foot range, labor and material together.
Subtract and the DIY saving is somewhere between a small loss and roughly $1,400. At the low end of the pro range and the high end of the bag range, you'd pay more to do it yourself, and spend a day hauling bags besides. CurrentCost's range doesn't pin an R-value, so this isn't a perfect apples-to-apples test. It's close enough to make a point.
That's my read, and you can argue with it. If your attic is open, easy to reach and under 600 square feet, the maths tilts toward DIY. A big, cramped or oddly shaped one belongs to a crew. To run the same comparison on your own square footage, the attic insulation cost calculator uses these exact figures.
What Does a DIY Day Look Like?
The Department of Energy fact sheet says blown-in loose fill is usually installed by professionals with pneumatic equipment, and it's the right call for irregular spaces and around obstructions. It's not impossible for a homeowner, but it's not a one-person job. CraftedCalcs notes the hopper and the hose end often sit 20 to 40 feet apart, the hopper needs near-constant feeding, and the blower can weigh over 100 pounds with the hopper on.
Budget two people and a full day. And buy the bags before you count on the free rental, since store rules vary by location and some SKUs use a 10 bag threshold instead of 20.
Line Items That Change the Quote
The per-foot figure isn't the whole bill. Ask any crew to price these separately:
- Air sealing. The DOE fact sheet is blunt that air leaks carry moisture into walls and attics, so sealing comes before insulation. A quote that skips it isn't comparable to one that includes it.
- Baffles at the eaves. Loose fill must not clog soffit vents, so rafter vents or baffles go in first. The same sheet says never to cover or block attic vents.
- Removing old insulation. CurrentCost lists $0 to $350 for waste bags and cleanup, so it's usually small unless the old material is wet or contaminated.
- Recessed lights and flues. Loose fill can't touch heat-producing fixtures, which means retainers or covers around each one.
- Access. A pull-down ladder through a hallway ceiling costs less to work through than a hatch in a closet.
If the attic has a bathroom fan venting into it, fix that first. Our guide to attic insulation and bathroom moisture explains why piling cellulose over an unsealed bath duct makes the moisture worse, not better. And if ducts run through the space, attic duct insulation is a cheap job to do in the same visit.
Is There Any Rebate Left for 2026?
Not from the federal government. The 25C Energy Efficient Home Improvement Credit expired on December 31, 2025, and Rewiring America's guide is explicit that purchases and installations after that date aren't eligible. Work finished before the deadline can still be claimed on a 2025 return.
State energy offices and utilities run their own programs, and those differ too much from state to state to list here. Call yours before you sign, and price the job as if the rebate is zero. The exterior foam cost breakdown covers the same credit change if you're weighing a bigger project.
Should You Do This Before Winter?
Short answer: yes, if your attic is thin. A top-up is one of the cheaper jobs on a house, and it doesn't compete with your heating budget the way a furnace does. Compare it with the fall 2026 HVAC numbers before you decide where the money goes first.
My advice is to get two written quotes now, each listing air sealing, baffles and the target R-value as separate lines. Then price the bags for the same attic. If a crew's number lands within a few hundred dollars of your bag cost, hire the crew. The fall checklist in our October home maintenance guide has a slot for this anyway.
Cellulose isn't the cheapest insulation per square foot, since batts price lower in the same 2026 guide. What it does well is fill an irregular attic floor with no gaps, and that's worth paying for if you count the labor honestly.