Blown-In Insulation Cost - Same-Day Service, Done Right the First Time

How Much Does Blown-In Insulation Cost in Woodland Hills?

Blown-in insulation in Woodland Hills typically runs $1,450 to $3,800 for a standard attic of 1,200 to 1,800 square feet, with most homeowners paying around $2,200. Your exact price depends on your attic’s current insulation depth, the product you choose (fiberglass vs. cellulose vs. mineral wool), and whether you need air sealing first. At Thistledown Insulation Woodland Hills, you’ll get a written price before anyone picks up a tool, so the number you’re quoted is the number you’ll pay.

Key Takeaways:

• Typical attic blown-in insulation cost in Woodland Hills: $1,450 – $3,800
• Fiberglass blown-in (Owens Corning AttiCat, Johns Manville Climate Pro): $1.10 – $1.75 per square foot installed
• Cellulose blown-in (GreenFiber, Knauf Jet Stream): $1.25 – $1.90 per square foot installed
• Mineral wool blown-in (Rockwool): $1.60 – $2.40 per square foot installed
• Most Woodland Hills attic jobs are completed in 4 – 6 hours
• Free estimates are standard with Thistledown – call (559) 245-9223 to schedule yours

Blown-In Insulation Cost Breakdown (2026)

Here’s what you can expect to pay in Woodland Hills this year, broken down by the three most common blown-in products our crews install in the valley and the hills above it:

These ranges assume a typical Woodland Hills attic with accessible hatch or pull-down stairs, existing insulation that can stay in place (or needs minimal removal), and no rodent damage or moisture issues. If you’re starting from an empty attic or need old insulation removed first, add $1 to $2 per square foot for extraction and disposal.

The biggest variable we see in Woodland Hills homes is the existing insulation. Many houses in the flats south of Ventura Boulevard were built in the 1950s and 60s with thin R-11 or R-13 batts. Homes in the hills, especially those built after 2010, often already have R-30 to R-38, but owners want to top up to R-60. Topping up costs less per square foot than starting from scratch because the old material stays in place and the new blown-in product just adds depth.

What Affects Blown-In Insulation Pricing in Woodland Hills

• Attic square footage and depth. A 900-square-foot attic in a Calabasas-adjacent condo will cost less than a 2,200-square-foot attic in a mid-century ranch south of Ventura. We price by the square foot installed, so the math is simple.
• Existing insulation condition. If your current batts are dry, clean, and sitting flat, we can blow new material right over them. If there’s rodent activity, water staining, or compressed old insulation, removal costs $1 – $2 per square foot before new material goes in.
• Air sealing needs. Gaps around recessed lights, plumbing vents, and the attic hatch leak air year-round. Air sealing typically adds $350 – $750 for a standard Woodland Hills attic, and it makes the insulation noticeably more effective.
• Product choice. Cellulose (GreenFiber, Knauf) is made from recycled paper with a borate treatment and costs a bit more than fiberglass. Mineral wool (Rockwool) is the quietest and most moisture-resistant, and it’s the most expensive of the three, which is why it’s a smaller share of our Woodland Hills installs.
• Attic accessibility. A walk-in attic is easy and fast. A tight crawlspace with a 2-foot access panel slows the crew down and adds labor hours. Homes with cathedral ceilings over part of the living space also reduce the blowable square footage and shift some of the project toward spray foam, which carries a different price.
• Time of year. Spring and fall are the busiest seasons for insulation in Woodland Hills. We don’t charge seasonal pricing, but if you need same-week service during a heat wave in July or August, scheduling flexibility helps. We answer calls live 24/7, so you can always reach a human to ask.

Fiberglass vs. Cellulose vs. Mineral Wool: What You’ll Pay and Why It Matters

Most Woodland Hills homeowners choose fiberglass for its lower price point and easy top-up. But let’s be specific about what each material does, because the cheapest option is not always the best fit for a valley home with kids and pets.

Fiberglass Blown-In ($1.10 – $1.75 per sq. ft. installed)

Owens Corning AttiCat and Johns Manville Climate Pro are our most installed fiberglass products. They’re light, they settle less than cellulose in dry attics, and they’re the lowest-cost option. In Woodland Hills, where our dry summers pull moisture out of everything, fiberglass stays fluffy for years. If you’re topping up an existing fiberglass batt attic, blown fiberglass goes on top seamlessly.

Cellulose Blown-In ($1.25 – $1.90 per sq. ft. installed)

GreenFiber SANCTUARY and Knauf Jet Stream cellulose are denser than fiberglass, which helps block air movement slightly better. The borate treatment also resists pests, which matters in Woodland Hills attics that back up to open hillside where rodents are more active. We choose pet-safe products where a choice exists, and cellulose with borate is one of them. A family with cats who like to explore the garage won’t run into anything concerning.

Mineral Wool Blown-In ($1.60 – $2.40 per sq. ft. installed)

Rockwool is the premium option. It handles moisture better than fiberglass, it’s naturally fire-resistant, and it damps sound, which is a real benefit if your Woodland Hills home sits close to the 101 or under the flight path into Burbank. Most of our Rockwool installs go into homes where the owner wants one-and-done insulation that never compresses and never needs a top-up.

Attic Cleaning and Prep: What It Adds to Your Blown-In Insulation Cost

Not every attic is ready for blown-in insulation the day we arrive. About one in four Woodland Hills homes we visit needs some prep work first.

Rodent remediation and droppings removal: In hillside neighborhoods like Calabasas Highlands or near Topanga State Park, rats and mice find their way into attics through vents and roof gaps. Removing contaminated insulation, sanitizing, and sealing entry points runs $1.50 – $3.00 per square foot. It’s unpleasant to budget for, but blowing new insulation over droppings is a health issue and a smell issue that never really goes away.

Existing insulation removal: If your 1960s batt insulation is crumbly, water-stained, or packed with decades of dust, removal typically costs $1 – $2 per square foot. The crew bags everything in the attic, lowers it through the hatch, and hauls it away the same day. You’ll never see a bag sitting on your front lawn.

Minor roof leak repairs: We don’t patch roofs, but we do flag water stains and softened decking when we see them. Most homeowners appreciate the heads-up before new insulation gets installed over a slow leak that would ruin it.

Blown-In Insulation vs. Spray Foam: What’s the Right Choice in Woodland Hills?

Spray foam runs $3.50 – $7.00 per square foot installed, roughly three times the price of blown-in fiberglass. It makes sense in specific situations: unvented attics, cathedral ceilings, or homes where the HVAC equipment lives in the attic. For a standard vented attic in Woodland Hills, blown-in insulation at R-38 to R-60 is the right value choice for most families.

Our crews install both, and we’ll tell you honestly which one your attic needs. If blown-in is the right answer, we won’t pitch you spray foam to inflate the invoice. That’s not how Thistledown works. The written price is the price, and the product is what your attic actually needs.

For more detail on what blown-in installation looks like in your home, see our Blown-In Insulation in Woodland Hills guide.

How to Save on Blown-In Insulation in Woodland Hills

Saving money on insulation doesn’t mean cutting corners on the product or the crew. Here’s where you can keep costs down without giving up the clean-home, written-price standards we run on.

• Top up instead of replacing. If your existing insulation is dry and intact, blowing new material over it is the single biggest cost saver. You’re paying for new material and labor, not removal and disposal.
• Time it with a roof replacement. If your roofer is up there anyway, adding attic insulation the following week means you’ll catch any old leak issues before new insulation goes in. It also gives you a cleaner attic to work with.
• Bundle air sealing with your insulation. Sealing the hatch, recessed lights, and plumbing stacks at the same time costs less than a separate visit because the crew is already in the attic with the foam gun.
• Avoid the urgency markup you’ll find elsewhere. Some companies charge extra for same-week service. We don’t. Call (559) 245-9223 and a live person answers, 24/7, with a real conversation about your attic and a free estimate.
• Ask about utility rebates. LADWP and SoCalGas periodically offer insulation rebates for Woodland Hills homes. Our team can point you toward current programs during your estimate, and the written price you receive will reflect any rebate eligibility.

What Happens on Installation Day (and What You’ll See After)

The price isn’t the only thing families in Woodland Hills want to know. They also want to know what the house will look like after the crew leaves. Here’s exactly what happens.

Before work starts, we lay drop cloths across your hallway and wear shoe covers from the front door to the attic hatch. The crew is uniformed and background-checked, so you know exactly who’s walking through your home. If the baby is napping, we keep the tools quiet and work upstairs without unnecessary noise.

We blow the insulation in stages, checking depth markers as we go so every inch of the attic reaches the R-value we quoted. When we’re done, we take photos of the attic and the clean-up before the van leaves. You get a photo of your clean hallway floor, the drop cloths rolled up, and the attic fully insulated. The C.A.R.E. values we work by are not a slogan: Clean up like it is our own home, Ask before we move or touch anything, Respect the family’s time and quiet hours, Explain the price before the work. That’s the standard on every Thistledown job in Woodland Hills.

Thistledown is the soft fluff of the thistle, one of nature’s lightest insulators. The name is a promise about how carefully we work. We founded this company in 2003 as part of the Cedarwell family of independently owned insulation companies, and every home we enter gets the same Cedarwell Care Promise: shoe covers, drop cloths, a photo of the clean-up, and a written price before any work starts.

FAQs – Blown-In Insulation Cost in Woodland Hills

How much does blown-in insulation cost per square foot in Woodland Hills?

You’ll pay $1.10 to $2.40 per square foot installed in Woodland Hills, depending on the product. Fiberglass runs $1.10 – $1.75, cellulose $1.25 – $1.90, and mineral wool $1.60 – $2.40. A typical 1,500-square-foot attic falls between $1,650 and $3,600 installed. Call (559) 245-9223 for a written quote specific to your attic, and estimates are free.

Is blown-in insulation cheaper than batt insulation?

Blown-in fiberglass at $1.10 – $1.75 per square foot installed is typically 10 – 20% cheaper than a comparable R-value of batt insulation, which runs $1.50 – $2.50 per square foot installed in Woodland Hills. Blown-in also covers uneven ceilings and awkward corners better than carefully cut batts. If you’re comparing options, our home page covers the full range of insulation services we offer in Woodland Hills and surrounding areas.

Can you install blown-in insulation in one day?

Yes, most Woodland Hills attics are fully insulated in 4 – 6 hours, including setup and clean-up. Larger attics over 2,000 square feet or projects that require old insulation removal may take a second day. We schedule around your family’s routine, and a live person answers our phone 24/7 if you need to talk through timing.

How much does it cost to remove old insulation before blowing in new?

In Woodland Hills, removing old batt or blown-in insulation costs $1 – $2 per square foot, so a 1,500-square-foot attic typically adds $1,500 – $3,000 to the project. The price includes bagging in the attic, lowering through the hatch, and same-day haul-off. If your current insulation is dry and rodent-free, you can usually skip removal and simply top up over it.

Does blown-in insulation settle, and will I need to add more later?

Fiberglass blown-in settles about 2 – 3% in the first year, which is why crews blow it to a slightly higher initial depth. Cellulose settles a bit more, around 10 – 15%, and mineral wool settles the least. We install depth markers in your attic so you can visually confirm the R-value any time. If your insulation ever drops below the quoted depth during the 365-Day Done Right Promise period, we make it right at no charge.

Get a Written Blown-In Insulation Price in Woodland Hills

You deserve to know the number before anyone picks up a tool. Call Thistledown Insulation Woodland Hills at (559) 245-9223 for a free estimate. A live person answers, 24 hours a day, 7 days a week. We’ll look at your attic, recommend the right product from our eight brand lines, and put your price in writing before you commit to anything. No fine print. No surprises. Just a clean attic, a quieter home, and a number that doesn’t move.

Pricing reflects the Woodland Hills market as of 2026. Thistledown Insulation Woodland Hills offers free estimates – call (559) 245-9223.

Written by Neil Barron, Owner at Thistledown Insulation Woodland Hills, serving Woodland Hills since 2003.