Why insulate
Why do Niwot homes need insulation attention?
Niwot's housing-age estimate is the oldest-skewing of any town in this service area — an estimated 77.9% of Niwot housing units predate 1990, with a median year built around 1983 (Census Bureau American Community Survey 5-year estimates, 2020-2024). Even at the low end of that estimate's margin of error, a clear majority of Niwot homes are old enough that original attic insulation, where it exists, is a reasonable bet to be under today's target.
Niwot is also the smallest market this property serves — an estimated 1,526 total housing units, against tens of thousands in Longmont — and that estimate's margin of error (±13.9 percentage points on the pre-1990 share) is the widest of the four towns. We're stating that plainly rather than presenting a small-sample estimate with more confidence than it has.
Utility-wise, Niwot is simpler than Longmont: Xcel Energy is confirmed as both the gas and electric utility here, so there's one insulation rebate program to check, not two.
According to the International Energy Conservation Code, “the 2021 IECC (R402.1.2) sets attic insulation minimums at R-49 to R-60 for Climate Zone 5.”
Rebates & credits
What rebates can Niwot homeowners claim?
Xcel Energy — the gas and electric utility here:
- Xcel Energy Insulation and Air Sealing Rebate — 30% of project cost for gas-heat customers, up to $500 for attic insulation, $350 for wall insulation, and $400 for air sealing, with a 1.5x multiplier when the heating fuel is Xcel gas. A reduced tier ($15–$60 per measure) applies to Xcel electric customers whose heat is not Xcel gas. Requires a participating contractor and a blower door test documenting at least a 20% reduction in CFM50.
Xcel's rebate excludes new construction, additions, garages, sheds, and mobile homes. Ask your contractor to confirm your project scope and heating fuel qualify before assuming a figure.
According to Xcel Energy, “Xcel's insulation and air sealing rebates pay 30% of project cost for gas-heat customers, up to $500 for attic insulation, $350 for wall insulation, and $400 for air sealing, with a 1.5x multiplier for customers whose heating fuel is Xcel gas.”
Get a quote
Tell Us About Your Home
30 seconds to fill out. Free quote, no high-pressure follow-up.
We've Got It. Here's What Happens Next.
We've got your info and are routing it to a local pro. When they call, here's what to look for in the quote you receive: (1) R-value target — the model energy code for Climate Zone 5 calls for R-49 to R-60 attic insulation; ask what your contractor is quoting to. (2) Air sealing scope — insulation alone does nothing if air leaks aren't sealed first, and Xcel requires a blower door test to rebate it. (3) Rebate handling — ask whether your project qualifies for Xcel's gas-heat tier or the reduced electric-only tier. (The federal IRA Section 25C tax credit ended December 31, 2025 — no federal insulation credit applies to 2026 work. Xcel Energy's insulation and air-sealing rebate remains active for its gas and electric customers here.) (4) Removal scope — older homes often need old insulation removed before new install. If a quote skips all four, get another quote.
Frequently asked
What do Niwot homeowners ask most about insulation and rebates?
Is Niwot's 'oldest housing share' figure reliable?
Treat it as directional, not precise. Niwot's estimated 77.9% pre-1990 share carries a margin of error of ±13.9 percentage points — wide, because Niwot's total housing stock is small (an estimated 1,526 units) relative to the other towns this property serves. Even at the low end of that range, most Niwot homes are old enough to be worth checking; we're just not going to quote you a precise percentage a small sample can't support.
Does Niwot have its own separate electric-utility rebate, like Longmont does?
No. Niwot is confirmed Xcel-electric — Xcel Energy serves both gas and electric here, so there's a single insulation rebate program to check. Longmont's situation (a second, Longmont Power & Communications-only rebate) doesn't apply in Niwot.
What does Xcel's rebate actually pay for a Niwot attic project?
For gas-heat customers: 30% of project cost, up to $500 for attic insulation, with a 1.5x multiplier applied when the heating fuel is Xcel gas. A reduced tier applies if your heat isn't Xcel gas. Xcel requires a participating contractor and a blower door test documenting at least a 20% reduction in CFM50.
Should I do this if my Niwot home was built after 2010?
Probably not yet. Post-2010 homes were built to recent code, with attic insulation well above older baselines. If your bills are normal and comfort is fine, hold the money.
Do you serve all of Niwot?
Yes — all of Niwot, plus Longmont, Lafayette, and Louisville. Service areas listed at the bottom of this page show where we work regularly.
Service area
Where do you provide insulation services in and around Niwot?
- Niwot
- greater Niwot area