DIY blown-in insulation typically costs about $0.50-$1.50 per square foot for materials and equipment, or roughly $500-$1,500 for a 1,000-square-foot attic. The final price depends on insulation type, target R-value, existing insulation, blower rental terms, and how much air sealing or cleanup the attic needs.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| Insulation material | $300 | $650 | $1,000 | For 1,000 sq ft; type and depth affect quantity |
| Blower rental | $0 | $100 | $250 | May be included with a qualifying bag purchase |
| Safety and prep supplies | $50 | $125 | $250 | Includes protective gear and basic air-sealing supplies |
| Estimated DIY total | $350 | $875 | $1,500 | Excludes major repairs or paid labor |
What DIY blown-in insulation costs in a 1,000-square-foot attic
For a typical accessible attic, blown-in cellulose costs about $0.50-$1.20 per square foot for material, while fiberglass commonly runs $0.40-$1.00. With equipment and basic supplies, a 1,000-square-foot project often lands around $500-$1,500. Reaching a higher R-value or topping up an uneven attic can increase the amount required.
A practical midrange budget is about $875 for 1,000 square feet. This assumes standard bagged material, a one-day blower rental, and no extensive removal, electrical work, or structural repairs. Prices can vary by brand, store, and local availability.
Assumptions: accessible Midwest attic, standard materials, blower available locally, no major air-sealing repairs.
How bags, blower rental, and prep supplies shape the quote
Bag labels list coverage at specific depths and R-values; use those figures rather than relying on a generic bag count. The table shows common budget ranges for a 1,000-square-foot DIY project.
| Cost component | Low | Average | High | What changes the price |
|---|---|---|---|---|
| Cellulose bags | $300 | $650 | $1,000 | Bag price and target depth |
| Fiberglass bags | $350 | $700 | $1,050 | Product type and coverage per bag |
| Blower rental | $0 | $100 | $250 | Purchase requirement and rental duration |
| Air-sealing and safety supplies | $50 | $125 | $250 | Sealant, baffles, masks, and protective clothing |
| Delivery or disposal | $0 | $75 | $200 | Store delivery or old insulation removal |
Some retailers lend a blower when customers buy a minimum number of bags; confirm the terms, return time, and deposit before purchasing.
How attic depth and R-value change bag counts
Insulation quantity depends on the existing layer and the recommended R-value for the home’s climate zone. A bare attic targeting R-38 may need around 10-13 inches of material, while R-49 can require roughly 13-17 inches; actual depth varies by product. Check the package chart because cellulose and fiberglass settle differently.
Each extra inch across 1,000 square feet can add roughly $50-$120 in material. Complex framing, blocked eaves, narrow access, recessed lights, and irregular attic floors can also slow application or require baffles and fire-safe clearances. Never cover fixtures or vents unless the product and local requirements allow it.
Ways to lower the DIY price without cutting coverage
Compare bag coverage and cost per stated R-value, not just the price per bag. Ask whether the blower is free with a purchase threshold and whether the rental period includes pickup and return time. Buying the correct quantity in one trip can reduce delivery charges and avoid a second rental day.
Air-seal accessible gaps before blowing insulation rather than paying to insulate around avoidable leaks. Keep the scope to the attic floor if that is the intended thermal boundary, and skip premium products or added depth that are not needed for the home’s target R-value. Do not compress the insulation to fit a limited space.
Cellulose or fiberglass for a lower attic budget
Cellulose often costs less per installed depth and may be a budget-friendly choice for topping up an attic, but the actual cost depends on bag coverage and settled depth. Fiberglass can be lighter and easier to handle, though some products cost more per square foot at a comparable target. Both require careful distribution and appropriate protective equipment.
Existing insulation can usually remain if it is dry, clean, and in usable condition. Wet, moldy, pest-contaminated, or badly damaged material may need professional evaluation or removal, adding several hundred dollars or more. Avoid disturbing material that may contain asbestos; testing and specialized abatement are separate costs.
Three DIY attic sizes and their likely totals
These examples use typical bag pricing, one-day equipment access, and basic safety supplies. They exclude extensive air sealing and removal.
| Project | Material estimate | Other costs | Likely total |
|---|---|---|---|
| 500 sq ft top-up | $200-$500 | $50-$200 | $250-$700 |
| 1,000 sq ft attic to about R-38 | $400-$900 | $100-$300 | $500-$1,200 |
| 1,500 sq ft attic to about R-49 | $750-$1,400 | $150-$400 | $900-$1,800 |
Assumptions: common retail products and ordinary attic access; product coverage can shift totals substantially.
How much time and help does a blower job need?
A straightforward 1,000-square-foot attic can take about 4-8 hours for two people, including setup, bag feeding, and cleanup. One person operates the hose while another feeds the machine, so working alone can make the job slower and harder to control. A second rental day may add $75-$150 or more.
Before starting, protect the attic hatch, mark joists, install required baffles, and confirm the blower’s electrical requirements. The operator should follow the machine instructions and avoid kinks or blockages in the hose.
Why local prices and blower terms differ
Material prices and delivery charges vary by retailer and region. Big-city and high-demand markets may run about 10%-25% above lower-cost rural areas, while remote locations can pay more for delivery or have fewer rental options. These are planning differences, not fixed regional price lists.
Seasonal demand can also affect blower availability, especially during cold-weather preparation. Reserve equipment before buying bags, verify store hours and return deadlines, and compare the full rental terms rather than assuming a free blower is included.