Insulation in West Hollywood, CA
Spray foam insulation in West Hollywood is the fastest way to fix top-floor units that bake in the late-afternoon heat pushing off the Sunset Strip corridor. Most of the city’s 1920s through 1960s apartment buildings and courtyard bungalows went up with hollow 2×4 wall cavities and thin or missing attic insulation, so we spend most of our days retrofitting occupied multi-unit buildings with open-cell and closed-cell foam, blown-in dense-pack, and radiant barrier. Call (213) 527-4062 when you’re ready to stop sweating through September.
Why West Hollywood Homes Are Different
West Hollywood packs roughly 1.9 square miles with some of the oldest, tightest-spaced housing stock in Los Angeles County. Pre-1979 rent-controlled apartment buildings dominate: 1920s and 1930s courtyard bungalows, stucco dingbat walk-ups from the 1940s and 1950s, and mid-century multi-unit complexes. Almost none of them originally had wall insulation. The wood-frame stucco construction means hollow cavities between studs, and retrofitting those walls with blown-in or injection foam while tenants are still living there is the single most common insulation job we do in the city.
There’s a quirk here that changes how permits work. West Hollywood has run its own building department since 1984, so insulation permits and inspections go through the City of West Hollywood, not LA City. A contractor working the same street can face two different approval chains depending on which side of the city line the job sits. We know which side we’re on and file accordingly.
Climate matters too. The baseline is mild Mediterranean, but the dense urban corridor along Santa Monica Boulevard and the Sunset Strip creates a localized heat-island effect. Attic temperatures in top-floor units run well above ambient, which makes inadequate attic insulation the leading comfort complaint and the easiest efficiency win for older apartment owners.
Our Main West Hollywood Services
Two services get the most calls from West Hollywood property owners, and each has its own dedicated page with local pricing and job details.
Attic Insulation in West Hollywood
In West Hollywood’s 1930s through 1960s apartment buildings, the attic is usually the single biggest energy leak. Original batt insulation, where it exists at all, is thin, compressed, or settled below the top plates. We install Owens Corning and Johns Manville blown-in fiberglass and cellulose to bring top-floor units up to current R-value targets, which immediately drops ceiling temperatures and quiets the street noise that drifts up through the roof deck. Read the full breakdown on our Attic Insulation in West Hollywood page.
Crawl Space Encapsulation & Vapor Barrier in West Hollywood
Crawl spaces under West Hollywood’s older bungalows and dingbats tend to be short, dirty, and damp. Unsealed crawl spaces pull moisture up into floor assemblies and wall cavities, which makes insulation perform worse and invites mold. We install vapor barriers, seal vents, and encapsulate the space so the entire building envelope stays dry. Get the full picture on our Crawl Space Encapsulation & Vapor Barrier in West Hollywood page.
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.
Spray Foam Insulation in West Hollywood
Spray foam insulation in West Hollywood solves two problems at once in the city’s older apartment stock: it seals air leaks and adds serious R-value in cavities that were built empty. On top-floor units near the Sunset Strip, closed-cell foam on the roof deck or attic floor cuts the heat-island effect dramatically, and in party walls it doubles as acoustic treatment against late-night club noise. Our crews install open-cell and closed-cell foam from Icynene and Demilec, and we’ve been doing Spray Foam Insulation work in this exact housing type for years.
Open-Cell Spray Foam
Signs you need it
Top-floor units stay hot after sunset and you hear street noise through the ceiling.
What it costs in West Hollywood
Open-cell spray foam in West Hollywood typically runs $1.50 to $2.50 per board foot for attic roof decks and ceiling cavities.
How we do it
We mask off the work area, spray the foam to the specified depth, let it cure, and trim it flush before reinstalling any access panels.
Closed-Cell Spray Foam
Signs you need it
Moisture gets into rim joists or roof decks, or you need maximum R-value per inch in a tight cavity.
What it costs in West Hollywood
Closed-cell spray foam in West Hollywood typically runs $2.50 to $4.00 per board foot, with rim joist jobs landing on the higher end.
How we do it
We spray the foam in lifts to control expansion, check the depth against the target R-value, and verify the foam has adhered fully before closing the cavity.
Rim Joist Spray Foam
Signs you need it
You feel drafts along the top of the foundation wall or see rodent entry points where the floor meets the sill plate.
What it costs in West Hollywood
Rim joist spray foam in West Hollywood runs $2.50 to $4.00 per board foot for typical 2×4 to 2×6 cavities.
How we do it
We seal each joist bay with closed-cell foam from the sill plate up, covering the entire rim area before the insulation crew moves into the floor system.
What Spray Foam Insulation Costs in West Hollywood
| Item | Typical range in West Hollywood |
|---|---|
| Open-cell spray foam | $1.50-$2.50 per board foot |
| Closed-cell spray foam | $2.50-$4.00 per board foot |
| Rim joist spray foam | $2.50-$4.00 per board foot |
Is spray foam worth it in West Hollywood’s mild climate?
Yes for top-floor units and party walls. The heat-island effect along Santa Monica Boulevard pushes attic temperatures well above the regional average, so air-sealing foam pays off faster than in a freestanding house. Call (213) 527-4062 for a straight answer on your building.
Can you spray foam an occupied apartment building?
We do it regularly in West Hollywood. Tenants can stay in adjacent units while we foam attics, rim joists, or one wall cavity at a time, with containment and ventilation managed around the work area. Estimates are always free.
Blown-In Insulation in West Hollywood
Blown-in insulation in West Hollywood is the go-to retrofit for hollow-wall apartment buildings and bungalows from the 1920s through the 1950s. Dense-pack cellulose and fiberglass fill the empty 2×4 cavities without tearing out plaster or drywall, and the same material tops up attics that have settled below the top plates. We install Knauf and GreenFiber products for Blown-In Insulation jobs across the city.
Blown-In Cellulose
Signs you need it
Rooms run hot in summer, cold in winter, and you hear neighbors through walls that should be quiet.
What it costs in West Hollywood
Blown-in cellulose in West Hollywood runs $2 to $3 per square foot for walls and $1.50 to $3 for attic top-ups.
How we do it
We drill access holes, blow the cellulose to the target density, and patch the holes to match the existing surface.
Dense-Pack Wall Insulation
Signs you need it
Exterior walls feel hollow when you knock and the building predates the 1980s energy codes.
What it costs in West Hollywood
Dense-pack wall insulation in West Hollywood runs $3 to $5 per square foot installed, depending on access and ceiling height.
How we do it
We dense-pack the cavity from inside or outside using a high-pressure hose, verify the fill with an infrared camera, and repair the access points.
What Blown-In Insulation Costs in West Hollywood
| Item | Typical range in West Hollywood |
|---|---|
| Blown-in cellulose | $2-$3 per square foot |
| Blown-in fiberglass | $1.50-$3 per square foot |
| Dense-pack wall insulation | $3-$5 per square foot |
How long does blown-in insulation last in West Hollywood’s climate?
Cellulose and fiberglass both hold their R-value for decades when they stay dry. The bigger issue in older buildings is settling, so we dense-pack walls and top up attics to original depth. Call (213) 527-4062 and we’ll check what’s in your walls.
Can you insulate walls without removing drywall?
Yes. Dense-pack blown-in goes through small holes we drill and patch, so plaster and drywall stay intact. It’s the standard retrofit approach in West Hollywood’s pre-1979 apartment stock.
Radiant Barrier Installation in West Hollywood
Radiant barrier installation in West Hollywood targets the heat-island effect that makes top-floor units along the Sunset Strip and Santa Monica Boulevard feel like ovens by 4 p.m. A foil layer under the roof deck reflects radiant heat before it enters the attic, which drops ceiling temperatures and takes load off the AC. We pair it with proper attic ventilation and do Radiant Barrier Installation work on dingbats, bungalows, and newer mixed-use infill buildings.
Attic Radiant Barrier
Signs you need it
The attic stays hot well after sunset and the top-floor unit runs its AC nonstop from June through October.
What it costs in West Hollywood
Attic radiant barrier in West Hollywood runs $1.50 to $3 per square foot installed, depending on roof pitch and access.
How we do it
We staple foil-faced barrier to the underside of the rafters or lay it over existing attic insulation, keeping the reflective side facing the air gap.
Radiant Barrier & Ventilation
Signs you need it
The attic has no ridge vents or the existing vents are blocked, so heat builds up with no escape path.
What it costs in West Hollywood
Radiant barrier with ventilation upgrades in West Hollywood runs $2 to $4 per square foot when we add or repair vents.
How we do it
We check intake and exhaust vent balance first, then install the barrier so airflow across the underside keeps the attic within a few degrees of ambient.
What Radiant Barrier Installation Costs in West Hollywood
| Item | Typical range in West Hollywood |
|---|---|
| Attic radiant barrier | $1.50-$3 per square foot |
| Radiant barrier foil (material only) | $0.50-$1.50 per square foot |
| Radiant barrier with ventilation | $2-$4 per square foot |
Does radiant barrier help in a city as mild as West Hollywood?
It helps most in the buildings that overheat, not the ones that stay comfortable. Top-floor units near the entertainment corridor see the biggest drop in ceiling temperature. Call (213) 527-4062 and we’ll tell you honestly if your attic is a good candidate.
Can radiant barrier go over existing insulation?
Yes. Laying foil over the attic floor insulation is common in West Hollywood attics with low clearance, and it performs well as long as dust doesn’t build up on the reflective surface.
Insulation Removal & Replacement in West Hollywood
Insulation removal and replacement in West Hollywood usually means pulling out material that’s been soaked by roof leaks, packed with rodent droppings, or contaminated by decades of dust and debris in an old dingbat attic. Older apartments in this city sometimes have original insulation that’s compressed or vermiculite that should come out before new material goes in. We handle the full Insulation Removal & Replacement process: removal, cleaning, air sealing, and new insulation.
Attic Insulation Removal
Signs you need it
The existing insulation is compressed, water-damaged, or covered in decades of dust and pest waste.
What it costs in West Hollywood
Attic insulation removal in West Hollywood runs $1.50 to $3 per square foot, with higher rates for tight or low-clearance attics.
How we do it
We use a HEPA-filtered vacuum to pull out the old material, then inspect the attic floor and top plates before any new insulation goes in.
Contaminated Insulation Removal
Signs you need it
You see rodent droppings, smell urine, or find mold on the insulation surface in an apartment or bungalow attic.
What it costs in West Hollywood
Contaminated insulation removal in West Hollywood runs $2.50 to $5 per square foot due to containment and disposal requirements.
How we do it
We set up containment, remove the contaminated material with HEPA equipment, sanitize the space, and seal entry points before reinstalling insulation.
What Insulation Removal & Replacement Costs in West Hollywood
| Item | Typical range in West Hollywood |
|---|---|
| Attic insulation removal | $1.50-$3 per square foot |
| Contaminated insulation removal | $2.50-$5 per square foot |
| Insulation replacement | $2-$4 per square foot |
Is it cheaper to remove old insulation or just add more on top?
If the old insulation is dry and intact, topping up is cheaper. If it’s compressed, wet, or contaminated, removal first saves you from sealing problems under a fresh layer. Call (213) 527-4062 for a straight read on your attic.
How long does insulation removal take in a West Hollywood apartment attic?
Most attics in the city’s dingbats and courtyard buildings take one to two days for full removal, cleaning, and reinstallation. Larger complexes with multiple units take longer, and we’ll give you a written timeline before we start.
Attic Air Sealing in West Hollywood
Attic air sealing in West Hollywood stops the stack effect that pulls conditioned air out of top-floor units and drags hot attic air down through can lights, top plates, and duct boots. In pre-1979 apartment buildings, the gaps around framing and penetrations are usually wide open, which is why sealing the attic floor before adding insulation delivers a bigger comfort improvement than the insulation itself. We do Attic Air Sealing as a standalone service or paired with blown-in top-ups.
Attic Floor Air Sealing
Signs you need it
Dust collects around ceiling fixtures and the top-floor unit never holds temperature, even after insulation was added.
What it costs in West Hollywood
Attic floor air sealing in West Hollywood runs $1.50 to $3 per square foot when combined with insulation, or $3 to $6 as a standalone job.
How we do it
We seal every penetration, joint, and gap in the attic floor with foam or caulk before blowing insulation over the sealed surface.
Can Light & Duct Boot Sealing
Signs you need it
Recessed lights feel hot or you can see daylight around the fixtures from inside the attic.
What it costs in West Hollywood
Can light and duct boot sealing in West Hollywood runs $50 to $150 per fixture when we handle them as part of a full attic seal.
How we do it
We install rated covers over non-IC fixtures, seal the gaps with foam, and wrap duct boots before the insulation goes down.
What Attic Air Sealing Costs in West Hollywood
| Item | Typical range in West Hollywood |
|---|---|
| Attic floor air sealing | $1.50-$3 per square foot with insulation |
| Standalone air sealing | $3-$6 per square foot |
| Can light and duct boot sealing | $50-$150 per fixture |
Does attic air sealing matter more than insulation in West Hollywood?
In older apartment buildings, yes. The air leaks are the bigger comfort problem, and sealing first means the insulation you add actually performs. Call (213) 527-4062 and we’ll inspect the attic floor before recommending anything.
Can you air seal an attic without removing the insulation?
Sometimes. If the existing insulation is in good shape, we can work around it in sections. If it’s contaminated or compressed, removal first is cleaner and faster.
Wall Insulation in West Hollywood
Wall insulation in West Hollywood is the retrofit that most of the city’s 1920s through 1950s apartment buildings were never built with. Hollow wood-frame stucco walls mean tenant complaints about heat, cold, and neighbor noise all lead back to the same empty cavity. We do injection foam and drill-and-fill work on occupied multi-unit buildings, plus interior soundproofing for units near the Sunset Strip nightlife corridor. Read more on our Wall Insulation service page.
Injection Foam Wall Insulation
Signs you need it
Exterior walls feel cold in winter and hot in summer, and the unit sits in a pre-1979 building with original plaster or drywall.
What it costs in West Hollywood
Injection foam wall insulation in West Hollywood runs $3 to $6 per square foot installed, depending on cavity depth and access.
How we do it
We inject slow-rise foam through small holes at each stud bay, verify the fill with an infrared scan, and patch the holes to match.
Interior Wall Soundproofing
Signs you need it
You hear music, voices, or footfall through party walls and ceilings in an apartment near the Sunset Strip or Santa Monica Boulevard.
What it costs in West Hollywood
Interior wall soundproofing in West Hollywood runs $5 to $10 per square foot for dense-pack insulation plus resilient-channel drywall work.
How we do it
We dense-pack the cavity, install resilient channel or sound clips, and add a second layer of drywall to break the vibration path.
What Wall Insulation Costs in West Hollywood
| Item | Typical range in West Hollywood |
|---|---|
| Injection foam wall insulation | $3-$6 per square foot |
| Drill and fill wall insulation | $3-$5 per square foot |
| Interior wall soundproofing | $5-$10 per square foot |
Can you insulate walls in an occupied apartment without moving tenants out?
Yes. We work unit by unit, wall by wall, with dust containment and patching done the same day. West Hollywood property managers use us for this exact reason. Call (213) 527-4062 to schedule a walkthrough.
Does wall insulation help with noise or just temperature?
Both. Dense-pack cellulose and injection foam cut thermal transfer and absorb sound, especially in the 1940s and 1950s wood-frame buildings common in West Hollywood.
Attic Cleaning & Rodent Proofing in West Hollywood
Attic cleaning and rodent proofing in West Hollywood starts with what we find in the city’s older apartment attics: rodent droppings, nests, chewed wiring, and insulation that’s been packed down by decades of activity. Rats and mice move through the same gaps and vents that leak air, so cleaning and exclusion work together. We do full Attic Cleaning & Rodent Proofing jobs, from cleanout to sanitizing to sealing every entry point.
Attic Cleanout
Signs you need it
You see droppings, nesting material, or old debris in the attic, or the insulation looks packed and dirty.
What it costs in West Hollywood
Attic cleanout in West Hollywood runs $2 to $5 per square foot for typical dingbat and bungalow attics.
How we do it
We remove debris and contaminated insulation with HEPA equipment, bag everything for disposal, and leave the attic floor ready for new insulation.
Rodent Proofing & Exclusion
Signs you need it
You hear scratching at night or see droppings reappear after cleaning, meaning entry points are still open.
What it costs in West Hollywood
Rodent proofing and exclusion in West Hollywood runs $500 to $2,500 depending on how many entry points we have to seal.
How we do it
We find every gap, vent, and penetration, seal them with steel mesh and foam, and verify nothing can get back in.
What Attic Cleaning & Rodent Proofing Costs in West Hollywood
| Item | Typical range in West Hollywood |
|---|---|
| Attic cleanout | $2-$5 per square foot |
| Attic sanitizing and decontamination | $1.50-$3 per square foot |
| Rodent proofing and exclusion | $500-$2,500 |
How long does attic cleaning take in a West Hollywood apartment building?
Most single-attic jobs in the city’s dingbats and courtyard complexes take one full day for cleaning, sanitizing, and basic exclusion. Larger attics or heavy contamination take longer. Call (213) 527-4062 for a timeline on your building.
Do you replace insulation after rodent contamination?
Yes. We remove the contaminated material, sanitize the space, seal the entry points, and install new insulation so the attic is clean, dry, and properly insulated when we leave.
Home Energy Audit in West Hollywood
A home energy audit in West Hollywood pinpoints exactly where a pre-1979 apartment building is losing conditioned air and letting heat in. We use blower-door testing and thermal imaging to map the leaks and hot spots, then hand you a prioritized list instead of a guess. For property owners who want to fix the right thing the first time, we offer full Home Energy Audit services across the city.
Blower Door Test
Signs you need it
Utility bills stay high, rooms never hold temperature, and no one has ever measured the building’s actual air leakage.
What it costs in West Hollywood
A blower door test in West Hollywood runs $200 to $500 as part of a full audit, or as a standalone test for smaller buildings.
How we do it
We mount the fan in an exterior door, depressurize the unit, and read the airflow needed to hold the pressure, which gives us the total leakage number.
Thermal Imaging Inspection
Signs you need it
Rooms feel different from wall to wall, or you suspect missing insulation in wall cavities and around windows.
What it costs in West Hollywood
Thermal imaging in West Hollywood runs $150 to $400 as part of an audit or as a focused scan of specific areas.
How we do it
We scan walls, ceilings, and floors with an infrared camera to map missing insulation, air leaks, and thermal bridging in real time.
What Home Energy Audit Costs in West Hollywood
| Item | Typical range in West Hollywood |
|---|---|
| Blower door test | $200-$500 |
| Thermal imaging inspection | $150-$400 |
| Full insulation and air leakage audit | $400-$900 |
Is an energy audit worth it for a small courtyard building?
Yes, especially if you’re planning insulation work anyway. The audit tells you which units leak the most and where the money goes first, which prevents spending on the wrong fix. Call (213) 527-4062 and we’ll walk you through it.
How long does an energy audit take in West Hollywood?
Most apartment units take two to three hours for the full audit, including blower-door testing and thermal imaging. Larger buildings take longer, and we’ll give you a written schedule before we start.
Brands We Service in West Hollywood
We install and service Owens Corning, Johns Manville, and Knauf products across West Hollywood, with common items like foam sealant and insulation batts stocked on our trucks for fast turnaround. See our brands for the full list and what we recommend for older apartment buildings.
Pricing for Insulation in West Hollywood, CA
| Service | Typical range in West Hollywood |
|---|---|
| Open-cell spray foam | $1.50-$2.50 per board foot |
| Closed-cell spray foam | $2.50-$4.00 per board foot |
| Blown-in cellulose | $2-$3 per square foot |
| Dense-pack wall insulation | $3-$5 per square foot |
| Attic radiant barrier | $1.50-$3 per square foot |
| Attic insulation removal | $1.50-$3 per square foot |
| Contaminated insulation removal | $2.50-$5 per square foot |
| Attic floor air sealing | $1.50-$3 per square foot with insulation |
| Injection foam wall insulation | $3-$6 per square foot |
| Attic cleanout | $2-$5 per square foot |
| Blower door test | $200-$500 |
Prices in West Hollywood run higher for tight attics, occupied units that need containment, and buildings with multiple access points or roof decks. Every job gets upfront pricing before we start, and we honor the Done Right Promise on the workmanship for life.
Neighborhoods We Serve in West Hollywood
We work throughout West Hollywood’s 1.9 square miles, from the courtyard bungalows of the Norma Triangle to the dingbat walk-ups near Plummer Park and the mixed-use buildings along Santa Monica Boulevard. Our crews are usually in the area within a day or two for estimates, and same-week scheduling is common for smaller jobs.
- Norma Triangle
- West Hollywood West
- Tri-West
- West Hollywood Heights
- Santa Monica Boulevard corridor
Service Area - Cities Near West Hollywood
Walt’s Insulation also covers the surrounding cities when West Hollywood jobs bring us to the edge of the map. We regularly work in Beverly Hills, CA, Culver City, CA, Marina del Rey, CA, and El Segundo, CA. Dispatch is coordinated from our Los Angeles office, and crews serve West Hollywood locally.
Serving West Hollywood, CA - Our Local Coverage Area
We’re based in the West 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 in West Hollywood
We answer the phone live 24/7 and can usually schedule an estimate within a day or two in West Hollywood. Smaller jobs like attic top-ups and air sealing can often start the same week. Call (213) 527-4062 and we’ll give you a real date on the first call.
West Hollywood runs its own building department, so insulation and air-sealing work is permitted through the City of West Hollywood rather than LA City. We handle the paperwork and inspections for every job. It’s one of the reasons we know which side of the city line your building sits on.
No. We work in occupied West Hollywood apartment buildings regularly, sealing and insulating unit by unit with containment, dust control, and same-day patching. Tenants stay in place, and we coordinate access with property managers so the building keeps running.
If your West Hollywood apartment, bungalow, or condo has been losing comfort to thin walls and empty attics, call Walt’s Insulation at (213) 527-4062. Walt Brenner and his crew have been insulating buildings in this city’s specific housing stock for a long time, and every job is backed by the Done Right Promise. Estimates are free, and a live person answers the phone.
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 the hour.
- 4You approve before work beginsNothing starts until you say go.
What West Hollywood Customers Say
"Crawl space was wet every spring. They laid the heavy liner, sealed the vents, and put a dehumidifier down there. Floors are warm and the moisture meter he left reads fine now. He still answers when I text him a reading."
- Devon Pierce"Spray foam in the garage ceiling under the bonus room. That room used to be unusable in summer. Walt talked me out of foaming the whole attic because it did not need it - saved me a couple thousand and I trust him more for it."
- Bud Larkin"The house had rats in the attic insulation and a smell we could not place. Walt's crew pulled all of it, sealed the gaps where they were getting in, sanitized, and put in new blown-in. He sent photos of the sealed openings so I could see it done."
- Rosa Delgado