Serving Denver & the Front RangeCold rooms upstairs? Text us the address — we'll get you on the schedule.
Insulation being installed in an attic

Attic Insulation in Denver, CO

[FREE WRITTEN ESTIMATE — CONFIRM WITH OWNER]
[YEARS IN BUSINESS][YOUR CITY CONTRACTOR LICENSE #] Send us these two and they go live here. If your Google rating is solid, we'll show that instead.
Free written estimatesMost attics done in one dayLocally owned & operated
Services

What we do

Attic insulation and air sealing for homes across Denver & the Front Range, plus walls and crawl spaces. We measure what you have before quoting anything.

Blown-in attic insulation at depth

Attic blow-in

Loose-fill cellulose or fiberglass blown to depth over a sealed attic floor, with baffles at the eaves and a measured final R-value left on a card by the hatch.

Air sealing at an attic top plate

Air sealing

Top plates, can lights, chases, and attic hatches sealed before insulation goes in. The step that makes everything above it actually work.

Wall injection insulation being installed

Wall injection

Dense-pack into empty stud cavities from the exterior or interior, patched and finished. For cold rooms in older homes where the walls were never insulated at all.

Crawl space

Rim joist and floor insulation, vapor barrier, and vent detailing so the floor above stops feeling like the outdoors in January.

Spray foam

Open and closed cell foam for rim joists, cathedral ceilings, and additions where there's no room for anything else to do the job.

Insulation removal

Water-damaged, pest-infested, or flattened insulation vacuumed out and the space sanitized before anything new goes down.

Commercial

Offices, retail, warehouses, and multi-unit buildings. We work around your hours and quote by phase if the job needs to run that way.

Which one

Just the attic, or the whole house?

Most homes only need the attic. Some are losing heat in three places at once. Here's how to tell which one you are — and it costs nothing to be wrong.

Start with the attic if

One or two rooms upstairs won't hold heat You can see the tops of the joists up there Ice builds up along the eaves each winter You want the fix with the fastest payback

We seal the leaks, blow to depth, and finish in a day.

Look at the whole house if

Cold rooms on more than one floor The house is drafty on windy days Floors over a crawl space are cold underfoot Walls are open for a remodel anyway

We assess attic, walls, and crawl space together, then stage the work so the biggest loss goes first.

Not sure which one you are?Tell us which rooms are cold and we'll tell you where to spend first. No pressure, no trip fee.
How it works

Three steps, no surprises

01

Call or text us

Tell us which rooms are cold or which bills look wrong. We book a time that works, usually within the week.

02

We measure and quote

We check attic depth, air leaks, and access, then hand you a written price. No pressure to sign on the spot.

03

We do the work

Most homes are a one-day job. We seal, insulate, mark the depth, clean up, and leave the paperwork with you.

Why reinsulate

Insulation doesn't last forever

Old fiberglass settles and flattens. Roof leaks and humidity ruin its R-value. Mice and squirrels tunnel through it. Any of these and you're paying to heat insulation that stopped working years ago.

Signs it's time
You can see the tops of the ceiling joists in your attic One floor or one room never matches the thermostat Ice dams along the eaves, or icicles every thaw Drafts at outlets, can lights, or the attic hatch Bills climbing while your habits haven't changed Signs of mice, water stains, or a musty smell up there
Brick exterior of an older two-storey home
Industry figures — sourced, not ours
90%of US homes are under-insulated. NAIMA
44%of a home's energy goes to heating and cooling. Insulate.org
Up to 70%of energy loss traces back to insulation and air leaks. US DOE
Local offer

Free attic assessment

Depth measured, leaks found, R-value written down — whether or not you hire us.

Claim it by text
Why us

Four things you can check

Everything in this band is verifiable in about a minute. The bracketed slots are waiting on the owner — send them over and they go live.

[YEARS IN BUSINESS]

Years doing this work

How long the business has been insulating homes in this area, under this name.

[YOUR CITY CONTRACTOR LICENSE #]

Licensed and insured

The contractor licence number and insurance carrier, printed so you can look them up yourself.

[WARRANTY TERMS]

What's warranted

What's covered, for how long, and what voids it — in plain words, on the quote.

[ATTICS COMPLETED]

Attics finished

A real count from the job records, not a round number picked to sound big.

Demo

This part is a demo. Everything else is your site.

Saturday, 7:42 PM · nobody in the office
Our upstairs is freezing all winter and the downstairs is fine. Do you handle insulation for that?
We do. That's usually attic insulation plus air sealing. Is the cold room under the attic or over the garage?
Under the attic. Two-story, built in the 70s.
Got it. We'd measure your attic depth and check for leaks at the top plates and can lights, then quote it. Free estimate — Tuesday 10am or Wednesday 4pm?
Tuesday 10 works.
Booked, Tuesday 10am. You'll get a text confirmation with your tech's name. — Northline
What does your calendar look like? Capacity calculator
3
$2,400
First year at a 25% fill rate $93,600 39 jobs a year at $2,400 each
Book 15 minutes with Chris
Service area

Where we work

Based in Denver, CO, working across Denver & the Front Range. Don't see your town? Call and ask — we go further for whole-house jobs.

Denver, Aurora, Lakewood, Arvada, Westminster, Thornton, Centennial, Littleton, Englewood, Wheat Ridge, Broomfield, Commerce City, Northglenn, Golden, Parker, Highlands Ranch

Find us Northline Insulation
Address[STREET ADDRESS — ONLY IF YOUR GOOGLE LISTING SHOWS IT]Denver, CO
Hours[YOUR HOURS]

These have to match your Google Business Profile character for character — send us what it says and we'll mirror it.

FAQ

Questions we get weekly

How much attic insulation should a Denver home have?

The Front Range sits in climate zone 5, where the Department of Energy recommends R-49 to R-60 in the attic — roughly 16 to 20 inches of blown-in. Homes built here in the 1970s and 80s were commonly done to R-19, so many are less than half way there. We measure your depth in three places and tell you the number before quoting anything.

How do I know if my attic needs more insulation?

If you can see the tops of the ceiling joists when you look across the attic floor, you're low. Cold upstairs rooms, ice dams at the eaves, and uneven bills point the same direction. We measure the existing depth and tell you what you have before quoting anything.

How long does insulation work take?

Most attics are a one-day job, start to finish. Wall injection and crawl space work depend on access and square footage, and that timeline goes in the written quote before anyone starts.

Do I need air sealing too, or just insulation?

Insulation slows heat; air sealing stops it leaking out entirely. Adding depth over unsealed top plates and can lights wastes part of what you pay for, so the leaks get sealed first wherever it matters.

Is insulation work messy?

There's dust in the attic, not in your house. Hose protection runs through the hallway, drop cloths go down at the hatch, and the work area gets vacuumed before the crew leaves.

Are there rebates available for insulation?

Most of the metro is served by Xcel Energy, which runs rebates on insulation and air sealing, and income-qualified households can also go through Energy Outreach Colorado. Programs change and some run out of funding mid-year, so we check what your job qualifies for the day we quote and fill out the paperwork with you.

Will more insulation stop my ice dams?

Usually, because ice dams form when heat escaping the house melts snow on a cold roof. Sealing the air leaks and bringing the attic up to depth keeps the roof deck cold, which is what stops the melt-and-refreeze cycle.

Do you remove the old insulation first?

Only when it needs to go. Dry, intact insulation can usually be topped up. Water-damaged, rodent-infested, or flattened material gets vacuumed out and the space sanitized first, and we tell you which case you're in before we quote.

Let's get it handled

Tell us the address and which rooms won't stay warm. A photo of your attic hatch helps — send it right in the text and we'll tell you what we'd look at.

Northline Insulation

Attic insulation, air sealing, wall injection, and crawl space insulation for homes in Denver & the Front Range.

(303) 555-0142

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