Insulation Contractor in Lynwood, CA - Cooler Rooms Under Older Roofs
D&J Hawthorne Insulation Services is an insulation contractor working in Lynwood, CA. We seal the leaks in attics, walls and crawl spaces, clear out old or damaged insulation, and put in new insulation that fits each house.

- Service area
- Lynwood, CA
- Call
- (424) 307-8033
Houses and small buildings across Lynwood
Lynwood is a short drive east of our base in Hawthorne, and the calls we get from there sound a lot like the ones closer to home: a back bedroom that won't cool down, a room over the garage that's always the worst in the house, and a power bill that keeps climbing. The houses we see here are mostly older single-family homes, many on raised floors with a crawl space underneath, along with duplexes, small apartment buildings and the shops on the busier streets. We do the same work in Carson and Gardena, so our crew knows these kinds of houses well.
What moves the price and the schedule here is mostly what's already in the attic and how much has to be fixed before anything new goes in, and your written estimate lays out the price and the plan. In older houses with low roofs, the tight space down by the eaves is the hardest to reach and the easiest to skimp on, so that's where our crew takes its time.
Our services in Lynwood, CA
A lot of older Lynwood attics have only a few inches of insulation left, packed down over the years and pushed around by past repair work. We measure what's up there, bring it up to an even depth across the whole attic and keep the eave vents open so the attic can still breathe.
When the old insulation is soaked from a past roof leak or full of droppings, laying more on top just keeps the problem in your ceiling. We bag it out and clean up, and I tell you what caused it so that gets fixed before anything new goes in.
Older ceilings leak air around can lights, pipes, wiring and the attic hatch, so hot attic air finds its way into the rooms below. We close those gaps first, because insulation sitting over an open gap is just fighting a draft.
When the ductwork runs through the attic or the room over the garage needs real help, closed-cell foam insulation, a dense foam that also blocks moisture, can be worth the higher cost because it seals and insulates in one pass. For most attics without ducts, I'd rather seal the gaps and top up with loose fill, and I'll tell you plainly which one fits your house.
Houses on raised floors can have cold floors and drafts coming up from below, especially where the old insulation under the floor has sagged or fallen down. We check the crawl space first, then insulate under the floor and seal the openings so the new material stays where it belongs.
Small shops and commercial buildings in Lynwood often have older roofs and insulation nobody has looked at in years, and it shows up in the power bill. I walk the building with you first, and we plan the work around your business hours where we can.
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
What happens when you call us about a Lynwood house
You call or send the form
Call (424) 307-8033 or fill out the form below, and we'll get back to you to pick a time that works. Tell us what you're noticing, like a hot room or a high power bill, so I know what to look for.
I look at the space
I come out myself, check the attic, walls or crawl space, and it helps if you're home to show me the rooms that bother you. You get a written estimate with the price and the plan, and anything that should be fixed first is listed on it, not hidden under new material.
We protect and seal first
On the day, the crew covers your floors and belongings, then seals the gaps around lights, pipes and the hatch. Only after that does the new insulation go in.
I walk the job with you
When the crew finishes, I check the work and walk it with you, so you can see the sealed gaps and the depth at the edges for yourself. Ask anything you want on that walk, because I want you to understand what you paid for.
Lynwood insulation questions, answered
Who issues building permits for insulation work in Lynwood?
The city's Building and Safety Division issues building permits in Lynwood, and it reviews plans and inspects work on repairs and alterations to buildings in the city. Its permit list names work like water heaters, wall heaters, outlets, solar, re-roofs and electrical, not insulation by name, so the division is the place to ask about your job. When a job does need a permit, we pull it and set up the inspections for you.
Does an insulation contractor in Lynwood need a California state license?
Yes, in most cases. The Contractors State License Board requires a current license from anyone who contracts for work that needs a building permit, uses employees, or takes on work worth $1,000 or more in combined labor and materials. Nearly any insulation job done by a crew meets at least one of those, and we're fully licensed and insured.
What causes a hot back bedroom or room over the garage in an older Lynwood house?
Usually it's thin insulation above that room plus open gaps in the ceiling that let attic heat pour in. Rooms over a garage often get the least insulation in the house, and old can lights and hatches leak more than people expect. I check those spots first when I come out.
How much does attic insulation cost in Lynwood?
Your price comes down to how big the attic is, what's already up there and what has to be fixed before new insulation goes in. Old insulation that has to come out, a lot of gaps to seal, or a low, tight attic all add to it, and foam costs more than loose fill. Sealing the gaps and topping up with loose fill is usually the better value unless ducts run through the attic, and I'll put the price and the plan in writing.
How long does an attic insulation job take, and do we have to leave the house?
With blown-in insulation, loose fill blown through a hose, you can usually stay home, and the length of the job depends mostly on how much old material comes out and how much sealing there is. Spray foam is different, because everyone leaves for the re-entry time, the wait the foam maker sets before people and pets can come back in. I'll tell you that time before we start so you can plan for the kids and pets.
How do I check earthquake hazard zones for my Lynwood address?
Type your address into EQ Zapp, the state geological survey's map tool, and it shows whether your property sits in any of its mapped earthquake hazard zones. It won't change how we insulate your attic, but it's a quick check worth doing before you plan bigger work on the house.
Get a written insulation estimate for your Lynwood home
Send the form or call, and we'll get back to you within one business day to set a time for me to come out to your Lynwood house. The visit and the written estimate are free, and there's no pressure to book.
- Call
- (424) 307-8033
- Location
- Hawthorne, CA 90250
- Hours
- Mon–Fri: 8 AM–11 PM, Sat–Sun: 7 AM–11 PM
Ask about your Lynwood house today
Tell us about the hot room or the power bill, and if something needs a closer look before I can answer, I'll say so.




