Cost to insulate a 2,000 square foot attic

A house is sold by its finished living area. An attic is priced by its floor. Those are the same number only on a single story house. Stack the same 2,000 square feet over two floors and the attic above it is about 1,000, because only the top floor has an attic over it.

That is the whole reason this page prices two attics. Get the wrong one and the budget is out by half, in either direction.

Three more subtractions catch people out. A cathedral or vaulted ceiling has no open attic over it. A room over the garage has a floor, not an attic floor. And an unheated garage is outside the heated space, so its ceiling is usually left out of the job.

The fastest measurement is the upper floor plan, not the attic. Pace the outside of the top story, length by width, and take off any part with a sloped ceiling. Inside the attic you can check it against the joists: dressed ceiling joists run 5.5 to 9.25 inches deep, and they run in one direction across the whole floor. The attic insulation calculator turns your own measurement into bags and a price.

Figures: Insulation Report Cost Model, August 2026. Blown fiberglass into an open attic you can get into. Labor at the national average wage for the trade. Material at store price. The crew-hour rate and the multiplier on wages are estimates, so every range here is an estimate too.

The last column is about the bag count, not the price. The maker publishes coverage at R-19, R-30, R-49, R-60. R-38 sits between two of those and is worked out here, on the product of R times coverage rather than on coverage itself. The blown-in cost page shows that arithmetic and tests it against a figure the maker publishes separately.

The method, as the model prints it

Here is the R-49 job at 2,000 square feet, in the model's own words.

• Attic floor area 2,000 sq ft, target R-49.
• Labor: 18.0 to 24.0 crew-hours at $26.32/hr (BLS national mean; no state given), times a 2 to 3 burden multiplier covering payroll tax, insurance, equipment, overhead and profit.
• Material: 50.6 bags at $67.58 (39.5 sq ft per bag at R-49), at retail shelf price.
• Wage data May 2025. Material price read 2026-08-07.
• The burden multiplier and the crew-hour range are estimates, not measurements. Material is shown at retail; a contractor pays less.

And the same target on the 1,000 square foot attic, for comparison.

• Attic floor area 1,000 sq ft, target R-49.
• Labor: 9.0 to 12.0 crew-hours at $26.32/hr (BLS national mean; no state given), times a 2 to 3 burden multiplier covering payroll tax, insurance, equipment, overhead and profit.
• Material: 25.3 bags at $67.58 (39.5 sq ft per bag at R-49), at retail shelf price.
• Wage data May 2025. Material price read 2026-08-07.
• The burden multiplier and the crew-hour range are estimates, not measurements. Material is shown at retail; a contractor pays less.

Two things to take from those. Material is about 78 percent of the low estimate on the big attic, and it is priced at the shelf, so a real bid can sit under the low end honestly. And halving the attic halves both lines, which is why the two per square foot figures match.

Two lines make up the total, and they behave differently.

• Material scales with area and with the target. More floor takes more bags. A deeper target takes more bags per square foot as well. That second one is not proportional: doubling the target from R-30 to R-60 multiplies the material by about 2.2, not by two, because loose fiber settles under its own weight and a deeper layer is a denser one. The U.S. Department of Energy describes the same effect.
• Labor scales with area alone, in this model. Crew hours come from floor area at 9 to 12 per 1,000 square feet, which is an estimate rather than a measurement. Raising the target buys more material, not more hours. A deeper blow does take somewhat longer in reality, so read that as a limit of the model.

Both lines are straight in floor area, so the per square foot figure does not fall as the attic grows here. It is $ 2.18 to $2.66 at R-49 on both attics. Real quotes usually do fall a little per square foot at the larger size, and the reason is the part of a job that is fixed: the drive, the setup, the supplier trip and any minimum charge. None of those is measured here, so this page publishes no size discount.

One effect of size is real and computable. A fixed block of extra hours lands harder on a small floor. At the burdened rate of $52.64 an hour, both inputs estimates, one extra crew-hour is about 6 percent of the low end of the modeled labor line on the 2,000 square foot attic, and about 11 percent on the 1,000. A tight hatch or an awkward corner therefore hurts the per square foot figure less on a big attic than on a small one. The installation cost page takes the labor line apart in full.

Cost pages usually claim a large regional swing. The parts do not support one. Material is about 78 percent of the low estimate on this attic, and a bag costs what it costs in every state. Only the labor slice moves with geography.

Figures: BLS OEWS May 2025 mean hourly wages, run through the Insulation Report Cost Model, August 2026, on 2,000 square feet to R-49. The estimated crew hours and wage multiplier are in every row, so all three are estimates.

The trade wage runs from $19.62 an hour in West Virginia to $37.64 in Washington. That is a gap of 92 percent. On this attic it compresses to about 16 percent on the installed low estimate, and about 27 percent on the high. A near doubling of the wage becomes about $649 at the low end and about $1,298 at the high, because the wage only touches one line. The cost index carries all 51 jurisdictions, including the three where the trade wage is derived rather than measured.

Real quotes do vary by region more than that. The honest reasons are mostly not the wage. They are local demand, minimum charges, disposal fees and how busy the season is.

Price is not the only thing that doubles. Three practical differences show up at 2,000 square feet, and they are worth raising with a contractor before the bid.

More bags than one easy run

At R-60 the big attic takes 63 whole bags of the anchor product, about 1,733 lb of material. The Greenfiber cellulose insulation blower, rental model 118 on the blower rental page publishes a throughput of 450 lb an hour, so that load is roughly 3.9 hours of blowing alone. Add carrying, opening bags and moving the hose. Cellulose is denser again. The same attic at R-49 takes about 137 to 142 of the 25 lb bags, which is 7.6 to 7.9 hours at that same rated rate. Those hour figures are arithmetic on a published rate, not a measured job time.

More things in the way

Obstructions scale with area. Twice the floor is roughly twice the recessed lights, twice the pipe vents and twice the wiring holes. It is also more duct, more chance of a masonry chimney needing a dam, and more stored belongings to move first. A square 2,000 square foot attic is about 45 feet on a side, and the published hose on that machine is 100 feet. A long ranch of the same area can run further than that from the hatch, which is a second setup rather than a longer hose.

More reason for the job to split in two

A job this size can outrun one visit, especially when air sealing comes first or the old material has to come out. The model prices one clean pass and carries no second-visit line, so ask instead: is this one day or two, and does the price change if it is two? Get the answer in the written scope.

The machine itself is often free. Both retailers publish the same kind of term, quoted here as they state it.

• The Home Depot, cellulose loose-fill: "The first day's rental is free with the purchase of 10 bags of Cellulose loose-fill insulation."
• The Home Depot, Owens Corning AttiCat blown fiberglass: "Free 24 hour blower machine rental with the purchase of 10 bags."
• Lowe's, Owens Corning AttiCat blown fiberglass: "Free 24-Hour machine rental with purchase of 10 bags or more AttiCat."

An attic this size clears ten bags several times over at any target, so the machine is not a cost worth budgeting. Neither retailer publishes a daily rate on the rental listing, so the cost of the machine on a job that clears ten bags is nothing. A deposit and a card hold are normal at the counter and are not published either. Terms read 2026-08-11.

Figures: material only, no labor, delivery, disposal or air sealing. Fiberglass is the cost model's anchor product, read 2026-08-07. Cellulose is a retail bag price read 2026-08-11, spread over the maker's own attic coverage card.

The cellulose range is the maker's two coverage columns, net of framing and adjusted for framing. The retail listing publishes one coverage figure, 48.8 sq ft, which is its R-19 framing-adjusted number. Attic coverage at higher R-values comes from the manufacturer attic card, not from the retailer. Both prices are one retailer on one day, and a contractor buys below shelf. There is no measured installed cellulose price on this site, so the saving on a fitted job is not known here, only the saving on the bags. The materials comparison weighs the two on more than price, and the per square foot page prices every material in the same unit.

Work down these in order. It ends in one figure and one row of the table.

1. Count the floors under the attic. One story means the attic floor is close to the whole house area. Two stories means about half it.
2. Start from the top story, not the listing. Pace the outside of the upper floor, length by width. That product is your starting area.
3. Take off every sloped ceiling. Cathedral and vaulted areas have no attic floor above them. So does a room built into the roof.
4. Take off the garage, unless it is heated. An unheated garage sits outside the heated space, and its ceiling is usually not part of this job.
5. Split it if the attic is split. Separate attics over an addition or a wing get measured and priced separately, because each needs its own setup.
6. Measure what is already up there. Push a ruler to the ceiling in three spots, away from the hatch, and note the material. The depth checker turns inches into an R-value range.
7. Pick the target for your zone. ENERGY STAR recommends R-30 in zone 1, R-49 in zones 2 and 3, and R-60 in zones 4 through 8 for a bare attic. Find your zone by ZIP.

The recommendation. Read your own area off step 5, then price the row above that matches it and your target. If the house is two story, the 1,000 square foot rows are almost certainly yours, and a bid built on 2,000 square feet measured the wrong floor. Ask what area it used before you argue about the price.

What to hand each contractor, so the quotes compare

Give all six to every contractor. Ask for the same six back in writing.

• Attic floor area, in square feet, and how you measured it.
• Target R-value and climate zone, so nobody quietly quotes lower.
• What is there now, by material and measured depth.
• In or out: air sealing, baffles at the eaves, removal, disposal.
• Bag count or coverage the bid assumes, which is checkable.
• Access, meaning hatch size, walkboards, and anything stored up there.

With those answered, divide each price by the same floor area and compare. Without them, two numbers on two sheets of paper are not comparing the same job.

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We do not sell insulation and we do not install it, which is why this section exists. A big attic is a big invoice, so it is worth being sure the money buys something.

• Dry material already near the target. ENERGY STAR recommends R-60 for a bare attic in zones 4 through 8. An attic already measuring about R-50 needs roughly 11 more bags across 2,000 square feet, about $754 of material, plus a full crew visit. That closes the last R-10 and cuts conductive heat flow through the ceiling by about 17 percent. Going from R-30 to R-60 cuts it by about 50 percent. The last step is the weakest one, and that R-10 threshold is an editorial judgement labeled as an estimate.
• Air sealing has not been done, and here it matters more. Insulation slows heat moving through material. It does nothing about air moving through gaps. A 2,000 square foot ceiling has roughly twice the light fittings, pipe stacks and wiring holes of a 1,000 square foot one, and about 179 feet of wall top plate around it against 126 feet, taking both as squares. More ceiling means more ways for warm air to leave. Department of Energy guidance puts sealing the ceiling first, then insulating, then ventilating. Air sealing is the line most quotes leave out.
• The old material is coming out anyway. Wet, moldy or rodent-fouled insulation should go before anything covers it. At this size you would be buying the new material twice. Remove or add over runs that test. If there is loose vermiculite on the floor, stop and treat it as possibly asbestos-containing, per EPA guidance.
• The roof or the wiring is due. Work that disturbs an attic wastes new insulation. Insulate last, after the trades that walk on it.

Recommended levels above are ENERGY STAR retrofit guidance, based on 2021 IECC Residential Provisions Table R402.1.3. Energy codes cover new building and work done under a permit. They do not usually cover adding insulation to an attic you already have. Which edition applies where you live depends on your state, and often on your city. Your local building department is the only authority on it.

• Attic insulation cost: the installed matrix and the method
• Blown-in cost, per bag and per square foot
• Every material priced in the same unit
• Bags and price for your own floor area
• How much R-value your attic needs
• Do it yourself, or hire? The arithmetic