Insulation Contractor in Altadena - Sealing Older Attics and Insulating Rebuilds
QuietCore Pasadena Spray Foam Insulation, an insulation contractor based in Pasadena, seals and insulates attics, walls and crawl spaces across Altadena, in older houses with hot upstairs rooms and in rebuilds with the walls still open.
- Service area
- Altadena, CA
- Call
- (626) 345-7649
Older homes and rebuilds across Altadena
Altadena isn't incorporated. Los Angeles County serves as its local government, so a job here goes through county offices, even though the houses look a lot like the ones we insulate next door in Pasadena and South Pasadena. County planners describe Altadena as rich in historic resources. On our jobs that means older houses with original framing, attics that were insulated once a long time ago, crawl spaces under the floor and rooms added over the garage. Since the Eaton Fire in January 2025, plenty of streets have rebuilds going up beside houses that came through.
That mix shapes how we work here. In an older house I find what's wrong up top before anything goes in, because a roof leak or old wiring under fresh insulation is still a problem. On a rebuild we come in while the walls are open, which is the easiest time a house will ever have to get insulated right.
Our services in Altadena, CA
A lot of older Altadena attics have a thin, tired layer that's piled deep in the middle and almost bare at the edges, which is why the rooms upstairs run hot. We measure how many inches are up there, keep the eave vents clear and bring the coverage up evenly all the way to the edges.
In a house that's been lived in for decades, the draft usually comes through gaps around can lights, pipes, wiring and the attic hatch. We close those gaps with air sealing before any new insulation goes down, because insulation laid over a draft can't do its job.
Old insulation that got wet from a roof leak, filled up with droppings or took in smoke shouldn't stay under new material, since the problem stays with it. We bag it out, clean the attic floor and look at the roof and wiring before anything new goes in.
On a rebuild the framing sits open before the drywall goes up, so we can fill every cavity full and seal around the boxes and pipes while we can see them. In older houses I check the wiring before any wall insulation goes in, because insulating around old wiring just hides it.
Older houses here often sit over a crawl space, and that's usually where cold floors come from. We check for moisture and look at the vents down there first, then insulate under the floor so it stays in place.
Foam costs more, and it seals air while it insulates, so it earns its price when ductwork runs through the attic or over a room above the garage. Most other attics do fine with sealed gaps and a top-up of blown-in insulation, loose fill blown through a hose, and I'll tell you plainly which one your house needs.
Every service we offer
Spray foam insulation
Attic insulation
Blown-in insulation
Home insulation
Insulation removal
Crawl space insulation
Wall insulation
Air sealing services
Basement insulation
Closed-cell foam insulation
Open-cell foam insulation
Commercial insulation
Crawl space vapor barrier
Vapor barrier installation
Attic air sealing
Retrofit insulation
How it works when you call us about an Altadena house
Call or send a request
Call (626) 345-7649 or fill out the form, and we'll set a time to come out. Tell us whether it's an older house or a rebuild, so I know what to look for.
Walk the attic with me
I come out myself and look at the attic, walls or crawl space with you, checking for leaks, droppings, buried vents and old wiring. You get a written estimate that lays out what gets done first and why, so you know the cost before anything is scheduled.
Our crew does the work
Our own trained crew does the job, and if your address needs a county permit, we pull it and handle the inspection that goes with it. On foam jobs we tell you the re-entry time, when you, the kids and the pets can come back inside, before we start.
Go over the finished job
Before we call it done, I walk you through the finished work so you can see what went in and where. Your satisfaction, guaranteed.
Altadena insulation questions answered
Who issues permits for insulation work on a house in Altadena?
LA County Public Works issues building permits for Altadena homes, not the City of Pasadena. The county's permit list names repairs, replacements, alterations and electrical, plumbing and mechanical work but doesn't name insulation, so the way to know for your house is to enter your address on the county's permit site and see which office covers it. We check that for you, and if the job needs a permit, we pull it.
How long do I have to get a county permit inspected in Altadena?
Public Works says to request the first inspection within 12 months of getting the permit, and follow-up inspections every 6 months keep it active. When we pull a permit for your insulation job, we take care of the inspection that goes with it.
How much does it cost to insulate an attic in Altadena?
It comes down to the size of your attic, what's already up there and how much has to happen before new insulation goes in. Old material that's wet, dirty or smoky has to come out first, gaps need sealing and buried vents need clearing, and foam costs more than sealing and topping up loose fill. I give you the figure in writing after I've seen the attic, with the order of work spelled out.
Do I need a licensed contractor to insulate my house in Altadena?
Not always, because the Contractors State License Board exempts a homeowner improving their own main home when all of its conditions are met. You have to have lived there for the 12 months before the work is finished, the work has to be done before any sale, and you can't have used the exemption on more than two structures in any three-year period. If you'd rather hire it out, we're licensed and fully insured.
What counts as a like-for-like rebuild in Altadena after the fire?
LA County Planning calls a rebuild like-for-like when it has the same size, location and land use as the legally established house that was lost. Changes can be approved if they add no more than 10% or 200 square feet, whichever is greater, to floor area, size, height or footprint, and anything bigger has to meet current county standards for Altadena, including a 20-foot front setback. If you're working out your plans, the county's Altadena One-Stop Permit Center offers residents a free virtual appointment on rebuilding plans, permits and inspections.
What should a fire rebuild contract include in Altadena?
The board requires a written contract for any home improvement job over $500, and it has to say who gets the permits and give a completion date. Rebuilding after a wildfire counts as home improvement, so the contract must be fixed price, and the contractor can't ask for or take a down payment of more than $1,000 or 10 percent of the total price, whichever is less. Check any contract you're handed against those points before you sign it.
Get a written insulation plan for your Altadena home
We reply within one business day to set a time, and I come out to your Altadena house myself to look at the attic, walls or crawl space with you. The estimate is free, done on site and obligation-free, and you get the plan and the order of work in writing.
- Call
- (626) 345-7649
- Location
- Pasadena, CA 91101
- Hours
- Mon–Fri: 8 AM–11 PM, Sat–Sun: 7 AM–11 PM
Get your Altadena attic looked at
We take calls until 11 PM every day, so call (626) 345-7649 or send the form whenever you have a minute.