Insulation Company in North Hollywood, CA
Blown in insulation retrofits are the most common job we handle in North Hollywood, and for good reason. The pre-war bungalows near the NoHo Arts District and the mid-century stucco tract houses east of the 170 freeway were built when energy was cheap and insulation was an afterthought. Now, with summer highs routinely breaking 100°F, those same homes cook from the attic down. Aliso Viejo Insulation Co has served North Hollywood since 2014, and we start every job the same way: figuring out what’s actually in your walls and attic, then matching the right material to the structure. Call (877) 352-4780 for a free estimate.
Why North Hollywood Homes Are Different
North Hollywood sits at the east end of the San Fernando Valley, where the heat is a different animal than what you get over the hill in Los Angeles proper. Triple-digit summer days are common, and attic temperatures can push 40 to 50 degrees hotter than the outside air. That turns any house with thin or settled insulation into an oven by mid-afternoon. The housing stock makes it worse. The 1920s through 1940s Spanish bungalows and duplexes around Magnolia and Chandler were framed with plaster-and-lath walls and built with no meaningful attic insulation at all. The 1950s through 1970s single-story stucco tracts that fill the upper parts of the 91611, 91612, 91615, and 91616 ZIP codes often have a thin layer of original fiberglass that has compressed to a fraction of its rated R-value.
Then there’s the wiring. A lot of these older North Hollywood homes still have knob-and-tube or early Romex circuits running through the attic and wall cavities. That changes how we blow in insulation, because loose fill around degraded knob-and-tube is a fire risk that has to be addressed before we install anything. In the pre-war bungalows near the NoHo Arts District, we also run into finished attics and low-slope roofs with almost no clearance, which means sealed-off kneewalls and original plaster ceilings that alter the entire approach. These aren’t complications you’d see in a new build. They’re the everyday reality of retrofitting insulation in this part of the Valley.
Our Main North Hollywood Services
Most North Hollywood homeowners call us about two things: bringing an under-insulated attic up to current code and sealing the building envelope with spray foam. Here’s what each job looks like in this city.
Attic Insulation in North Hollywood
Attic work in North Hollywood almost always starts with an inspection of what’s already up there. In the older bungalows, that often means a thin dusting of rock wool or vermiculite from the 1940s sitting below the joists. In the 1960s and 1970s tract houses, it’s usually flattened fiberglass batts. Either way, we’re typically removing or topping off existing material, air-sealing the attic floor, and blowing in new insulation to bring the assembly up to DOE-recommended levels for Climate Zone 3B. Low-slope roofs and converted attic spaces change the access plan, so we scope every job before quoting. Attic Insulation in North Hollywood walks through the full process.
Spray Foam Insulation in North Hollywood
Spray foam earns its keep in North Hollywood because of how it handles heat. Closed-cell foam, installed against the roofline or rim joists, creates an air and thermal barrier that stops the attic from turning into a heat sink in July and August. For the older plaster-walled homes near the Arts District, open-cell foam is often the better fit because it moves with the structure and won’t stress brittle plaster. We install both Icynene and Demilec systems, so the chemistry matches the house rather than the other way around. Spray Foam Insulation in North Hollywood covers the differences in depth.
What happens when you call
- 1
A real person answersNo phone trees — you reach a local pro.
- 2
You get an upfront price rangeHonest numbers before anyone is dispatched.
- 3
A background-checked tech heads outLicensed & insured, dispatched right away.
- 4
You approve before work beginsNothing starts until you say go.
Blown In Insulation in North Hollywood
Blown in insulation is the workhorse retrofit for North Hollywood’s older housing stock. In the pre-war bungalows and duplexes, blowing loose-fill fiberglass or cellulose into existing attic and wall cavities is often the only practical way to add R-value without tearing out original plaster. And in the 1960s and 1970s tract houses east of the 170, it’s the fastest way to top off settled insulation and restore what the heat has compressed. Because our crews install both fiberglass and cellulose, the material choice is driven by your attic’s conditions, not by what’s on the truck. That matters whether we’re working around old knob-and-tube wiring or filling sealed-off kneewalls in a converted attic. Learn more about the method on our Blown In Insulation page.
Cellulose Insulation
Signs you need it
Your attic insulation has settled below the joist tops, or you can feel heat radiating through the ceiling on summer afternoons.
What it costs in North Hollywood
Cellulose retrofit jobs in North Hollywood typically run $1.25 to $2.15 per square foot of attic space.
How we do it
We dense-pack or loose-fill GreenFiber recycled cellulose into the target cavities, after air-sealing and confirming the wiring is safe to cover.
Blown In Attic Insulation
Signs you need it
Rooms under the attic are consistently 8 to 12 degrees warmer than the rest of the house during summer, or your insulation is original to a home built before 1980.
What it costs in North Hollywood
Blown in attic insulation in North Hollywood usually falls between $1,500 and $3,200 depending on attic size and prep work.
How we do it
We remove or top off the existing material, air-seal penetrations at the attic floor, and blow new insulation to the specified depth and density.
What Blown In Insulation Costs in North Hollywood
| Item | Typical range in North Hollywood |
|---|---|
| Blown in fiberglass (attic, existing home) | $1.00 – $1.80 per sq ft |
| Blown in cellulose (attic, existing home) | $1.25 – $2.15 per sq ft |
| Attic air-sealing + blow-in combo | $2,200 – $4,500 |
Can you blow insulation into walls without removing the drywall?
Yes, in most cases. We drill small access holes through the exterior siding or interior drywall, blow the insulation into each stud bay under pressure, and patch the holes afterward. It’s the standard retrofit method for older North Hollywood homes with empty wall cavities.
How long does a blown in insulation job take in North Hollywood?
A typical attic blow-in takes one day, including prep and cleanup. Wall cavity retrofits usually run a second day, depending on access and the number of stories. We quote a timeline after the initial inspection so there are no surprises.
Brands We Service in North Hollywood
We install GreenFiber cellulose, Owens Corning and Johns Manville fiberglass, and Knauf mineral wool. That lineup means we can match the material to the house instead of forcing one product into every attic. Stock is pulled from our regional supply chain, and we schedule North Hollywood installs within a week of the estimate. See our full lineup on our brands page.
Pricing for Insulation Company in North Hollywood, CA
| Service | Typical range in North Hollywood |
|---|---|
| Blown in fiberglass (attic, existing home) | $1.00 – $1.80 per sq ft |
| Blown in cellulose (attic, existing home) | $1.25 – $2.15 per sq ft |
| Attic air-sealing + blow-in combo | $2,200 – $4,500 |
| Wall cavity blown-in retrofit | $2,300 – $5,000 |
| Open-cell spray foam (attic roofline) | $1.80 – $3.40 per sq ft |
| Closed-cell spray foam (rim joist, crawlspace) | $2.50 – $4.50 per sq ft |
| Spray foam + batt hybrid (attic floor or kneewall) | $2.00 – $3.75 per sq ft |
| Mineral wool batt upgrade (interior or sound wall) | $2.20 – $3.90 per sq ft |
North Hollywood prices run higher when access is tight, old wiring needs to be addressed before we blow anything in, or a finished attic forces us to work through kneewalls and small hatches instead of an open attic floor. Every quote is a fixed number before work starts, so there’s no per-bag metering or surprise upcharge at the end.
Neighborhoods We Serve in North Hollywood
We work all four North Hollywood ZIP codes (91611, 91612, 91615, 91616), from the NoHo Arts District and the Magnolia/Chandler bungalow blocks to the tract house streets east of the 170 and the low-rise apartments up toward Valley Glen. Our typical response window for an estimate or a diagnostic visit is one to two business days, with same-week scheduling available during most of the year.
- NoHo Arts District
- Magnolia Park / Chandler Estates
- West North Hollywood
- Valley Plaza
- Greater Toluca Lake area
Service Area – Cities Near North Hollywood
Our crews also cover the surrounding San Fernando Valley and east Valley communities. That includes Studio City, CA just over the hill to the southeast, Universal City, CA to the immediate south, Burbank, CA to the east, and Valley Glen, CA to the west. If you’re in North Hollywood or any of these nearby areas, call (877) 352-4780 for a free estimate.
Serving North Hollywood, CA — Our Local Coverage Area
We’re based in the North Hollywood area and know this community well. Use the map below to see our service coverage — if you’re nearby, we can almost certainly help.
FAQs About Insulation Company in North Hollywood
Most insulation retrofits, including blown-in and batt replacement, do not require a building permit in Los Angeles. If your project involves structural changes like converting an attic or modifying roof framing, the city may require a permit. We’ll tell you during the estimate whether your job falls into the permit category.
Yes. Every North Hollywood job starts with a free on-site inspection where we check existing insulation depth, wiring conditions, access clearance, and signs of air leakage. You get a written, fixed-price quote after the inspection, not before we’ve seen the house.
During most of the year we can schedule a North Hollywood estimate within one to two business days and start work within a week of the signed quote. Summer is our busiest season in the Valley, so late June through August may push scheduling out to ten days or so. Call (877) 352-4780 to check current availability.
What happens when you call
- 1A real person answersNo phone trees — talk to a local insulation pro.
- 2You get an upfront price rangeHonest numbers before anyone is dispatched. No surprises.
- 3A background-checked tech heads outLicensed & insured, typically within 1-hour.
- 4You approve before work beginsNothing starts until you say go.
What North Hollywood Customers Say
"Plastic laid from the front door to the attic hatch and they vacuumed the hallway afterward."
— Brooke Pruitt"Told me the crawlspace didn't need doing and only the attic did. Half the job, half the money."
— Marcy Anderson"Found and sealed a gap around the chimney chase that was basically an open chimney to the attic."
— Sanjay Patel