Insulation contractor in Morgan Hill, CA - comfortable rooms, done in the right order
Thermal Gilroy Spray Foam Insulation is an insulation contractor based in Gilroy, working in Morgan Hill's homes and commercial buildings. We seal attic gaps, top up or replace tired insulation, and foam crawl spaces and rooms over garages.
Request an estimate
Morgan Hill's mix of older and newer houses
Morgan Hill sits in the narrow south end of the Santa Clara Valley, about 10 miles north of us in Gilroy, with the Santa Cruz range on one side and the Diablo range on the other. On jobs there I see a real mix, from older houses near downtown to tract neighborhoods and newer homes on bigger lots toward the hills, and San Martin, just down the road, looks a lot the same.
That mix shapes the job. Older houses tend to have thin, settled insulation and plenty of open gaps, while newer ones usually have more up there but can still come up short over the garage and at the attic edges, so I don't guess what's in your attic until I've had a look.
Working in Morgan Hill: permits, price and schedule
Permits for work inside the city come from the Morgan Hill Building Division, which issues building permits for alterations and repairs, and its list of work that needs no permit covers things like sheds, fences and decks, not insulation. So whether your job needs one is the division's call, and if it does, we pull it and set up the inspections, which means that step comes before our installers do. We're licensed and insured. Your price moves with the size of the attic and how easy it is to get into, how many inches are already up there, whether soaked or droppings-filled material has to come out first, and how many gaps need sealing. The schedule turns on the permit and on anything I find that has to be fixed before insulation goes in, and you'll see both in the written plan I give you at the estimate.
Morgan Hill is a short drive up 101 from us, so getting a crew there is the easy part. We do the same work south in Hollister and north in Santa Clara, and if your city isn't on our list, call and ask.
What do older Morgan Hill houses need most?
In a lot of older Morgan Hill attics, the insulation has settled down to a few inches and the gaps around can lights, pipes and the hatch were never closed, which is why the house feels drafty and the upstairs runs hot no matter what the thermostat says. We seal those gaps before anything new goes in, keep the eave vents clear so the attic can still breathe, and make sure the edges end up as deep as the middle, since thin edges are where most attics fall short.
The other two spots we get called about are the room over the garage and cold floors over a crawl space. Both are hard to reach and easy to skip, so we go after them directly with foam, batts or a vapor barrier, whichever fits the space.
- Call (669) 205-6284
- Mon–Fri: 6 AM–11 PM, Sat–Sun: 7 AM–11 PM
- Gilroy, CA 95020
What we do for Morgan Hill homes
Attic air sealing
Many attics we open here have open gaps around can lights, pipes and the hatch, so the house stays drafty no matter how much insulation is up there. We close those gaps first with air sealing, which means plugging the leaks before insulating, so what goes on top can do its job.
Blown-in insulation
Older houses here often have just a few settled inches left, and blown-in insulation, loose fill sent through a hose, is usually the simplest way to top it up. We keep it as deep at the edges as in the middle and keep the eave vents clear.
Insulation removal
When old material is soaked from a past leak or full of droppings, laying new insulation over it just keeps the problem. We bag it out, clean up and get the cause fixed before anything new goes in.
Crawl space insulation
Houses on raised floors here often have cold floors because the crawl space is bare or the old batts have dropped. We insulate under the floor and, where it makes sense, lay a vapor barrier over the ground.
Spray foam insulation
The room over the garage is a common call in Morgan Hill, since its floor and side walls are hard to reach and easy to miss. Spray foam fits those tight spots and seals air while it insulates, so it's often what we use there.
Retrofit insulation
Plenty of older houses here were built with little or nothing in the walls. Retrofit insulation fills those walls without tearing the house apart, and I'll show you at the estimate which way fits yours.
How it goes when you call us about a Morgan Hill house
Call or send a request
You call and I answer, or I call you back, and I'll ask a few questions about the house, like its age and which rooms bother you. Then we pick a time for me to come out.
I look and write the plan
I come out myself to look at the attic, walls or crawl space, so it helps if you're home to show me the rooms that run hot or cold. I note anything that needs fixing first, like a leak or old wiring, and walk you through a written plan with the price before anything is booked.
Our installers work in order
If the job needs a permit, we get it and line up the inspections before work starts. Then our installers go in order, fixes first, then air sealing, then insulation.
We walk the finished job
Before we pack up, I go over the finished work with you and show you what's up there now. You'll know what was done and why.
Get a written insulation plan for your Morgan Hill home
We reply within 1 business day, and the estimate is free and on site, with no pressure to book. After you send the form, I call you to set a time, come out to your Morgan Hill house myself and walk you through a written plan. Backed by our satisfaction guarantee.
- Licensed and insured.
- Phone
- (669) 205-6284
- Location
- Gilroy, CA 95020
- Hours
- Mon–Fri: 6 AM–11 PM, Sat–Sun: 7 AM–11 PM
Insulation questions from Morgan Hill homeowners
Who do I call in Morgan Hill to find out if my insulation job needs a permit?
The Building Division at 408-778-6480 is the contact the city names when you're not sure whether a project needs a permit. Tell them what you're having done, and if the answer is yes, the paperwork and inspections are on us, as I said above.
Which building codes apply to a permit in Morgan Hill right now?
Permit applications in Morgan Hill have to meet the 2025 California Building Standards Codes, the state's building rules, as the city adopts and amends them in its own municipal code. If your insulation job needs a permit, that's the set of rules it gets filed under.
Can an insulation permit be applied for online in Morgan Hill?
Not through the city's online permit system, which takes contractor applications only for residential reroofs, repipes, water heaters and approved solar. The city asks that all other permits be sent by email to permits@morganhill.ca.gov, so if your job needs one, that's how we send it in.
How much does it cost to insulate an attic in Morgan Hill?
Your price comes in the written plan after I've seen the attic, because it rests on what's already up there and what needs fixing first. The biggest choice is foam or loose fill. Foam costs more and seals air while it insulates, but sealing the gaps and topping up with loose fill usually wins, unless your ductwork runs through the attic.
How long does attic insulation take, and when can we go back inside?
A straight top-up goes a lot faster than a job where old material has to come out or repairs come first, and I put the expected time in your written plan. With blown-in you can usually walk right back in, while foam has a re-entry time, the wait before you, the kids and the pets come back, and I'll tell you how long it is for your job ahead of time.
What causes the room over the garage to be hot in summer and cold in winter?
Usually the floor over the garage and the short side walls are thin, gappy or open to the attic, so outside air moves right through them. We seal those openings and often use foam there, since it fills the tight spots that batts tend to miss.
Set up a look at your Morgan Hill attic
We pick up seven days a week, early morning into the late evening, so you can call (669) 205-6284 after work or send the form whenever it suits you.
Request an estimateCall (669) 205-6284