Insulation contractor in Centennial, CO - even rooms upstairs and over the garage
Reliable Castle Rock Insulation Services is an insulation contractor working in Centennial, CO. We seal attic gaps, top up or replace tired insulation, and spray foam the rooms over garages so upstairs stops running hot and cold.

- Licensed and insured.
- Free in-person estimates.
- Expect a reply within 1 business day.
Family homes and townhomes across Centennial
As an insulation contractor based in Castle Rock, we come up to Centennial the same way we do to Highlands Ranch and Lone Tree next door. The city is mostly settled neighborhoods of single-family homes and townhomes, with offices and shops along the main roads, so our calls here come from homeowners with drafty rooms and from property managers who need a building done to commercial standards.
Your price depends on how much insulation is already up there, whether any of it has to come out, how many gaps need sealing and whether foam makes sense. The schedule mostly turns on removal and on whether a permit is needed, and the estimate I write on site gives you the number for your house. A lot of the homes here are two stories with a room over the garage, and that shapes the job, because the upstairs and that garage room are where you feel a weak attic first.

Our services in Centennial, CO
- Attic insulation
In two-story Centennial houses the upstairs usually tells you first, and the cause is often an attic where the old fill has settled and gone thin. Our attic insulation work brings the depth up across the whole attic with blown-in insulation, which is loose fill blown in through a hose, once the gaps underneath are sealed.
- Attic air sealing
Can lights, pipes and the hatch in a hallway or closet ceiling leave gaps that let house air leak straight up into the attic. Attic air sealing closes those gaps before anything else goes in, because insulation laid over a draft just spends its life fighting it.
- Insulation removal
Some attics we open here have insulation that got soaked by an old roof leak or is full of mouse droppings. We vacuum that out and clean up before new material goes in, since covering it only keeps the problem in your house.
- Spray foam insulation
The room over the garage is the cold floor we hear about most, because it sits over an unheated space and often has ductwork running through it. Foam costs more than loose fill but seals air while it insulates, so that's where I'll suggest it, and in a plain attic with no ducts, sealing the gaps and topping up loose fill usually wins.
- Crawl space insulation
Houses here with a crawl space instead of a full basement often have cold floors in the rooms above it. We seal and insulate the crawl space so the floor stops drawing cold from the space underneath.
- Commercial insulation
Centennial's offices and business parks bring calls from property managers who need work done to commercial standards. I spent my first years insulating offices, warehouses and metal buildings, and our installers bring that same order of work to your building.
What Centennial houses ask of an attic
A lot of the attics we climb into in Centennial have the hatch in a closet or hallway, ductwork running across the joists and vents along the low edges at the eaves. Those eave vents matter, because when new insulation gets blown right over them the attic stops breathing and moisture starts showing in the framing. So we put in baffles, which are short chutes that hold the insulation back, and we fill the edges as deep as the middle instead of leaving them thin. I'll point the flashlight at all of it with you before I write anything down.
Any contractor working under a city building permit in Centennial has to be licensed with the city, and the city's Building Division approves those licenses and handles permits and inspections. Before you hire anyone, ask whether they're licensed with Centennial, since the city's license application asks for proof of general liability and workers' comp insurance or a workers' comp waiver. We're licensed and insured.
Get a free on-site insulation estimate for your Centennial home
Fill out the form or call (720) 408-0974 and tell me what's going on in your Centennial house, and you'll hear back within one business day. I come out myself to look at the job and write the estimate, it's free with no obligation, and if you go ahead, our own installers do the work.
What careful insulation work looks like
Questions from Centennial homeowners
How much does attic insulation cost in Centennial, CO?
The cost comes down to the size of your attic, how many inches are already up there and whether that old layer can stay or has to come out first. How many gaps need sealing, how easy the hatch is to work through and whether any part of the house is better off with foam all move it too. I measure and look at all of that when I come out, and the estimate gives you the figure for your house.
Do I need a permit to insulate my house in Centennial?
Some insulation jobs can need one, because the city requires a permit for any project that alters or repairs a building, and for any work on electrical, gas, mechanical or plumbing systems. The research doesn't settle every insulation job, so before we start I check which office covers your address. When a permit is needed, we apply for it and set up the inspections.
Can a homeowner pull their own building permit in Centennial?
Yes, but only if you're doing the work yourself and you live in the house, and you'll need to turn in the city's Homeowner Agreement when you apply, according to the Building Division's owner-permit rules. When we do the job, the permit goes through us as the contractor, so you don't have to file anything.
How long does it take to get a building permit in Centennial?
When a job needs plan review, the city says that review takes about 5 to 20 business days. The permit is issued once every review is approved, the fees are paid and every contractor on the job is added and active, and it then stays active for 180 days. If your job needs one, I'll tell you at the estimate so you can plan around the wait.
How do I find out if my Centennial home is in a floodplain?
You can look up your address on the city's floodplain map. Proposed projects in the floodplain go through a floodplain development permit, which the Southeast Metro Stormwater Authority reviews and issues. That makes it worth checking before we plan crawl space or basement work.
How long will the insulation crew be in my attic, and when can my family go back inside?
With blown-in or air sealing work you can usually stay home, but with spray foam everyone, kids and pets included, stays out until the re-entry time has passed, which is the wait the foam maker sets before people come back in. How long our installers are up there depends on the attic's size and on whether old material has to come out first. I'll walk you through the schedule for your house at the estimate.




