According to Boulder County Community Planning & Permitting, building permits for properties in unincorporated Boulder County, which includes Niwot, are issued by the county rather than by a municipality, under a Boulder County Building Code that adopts the 2021 International Residential Code and the 2021 International Energy Conservation Code, with the current county amendments effective July 1, 2026.
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 U.S. Census Bureau, the ACS 5-year estimates are available for the nation, all states, and places (i.e., towns or cities) — the geography behind this site's town-by-town housing-age figures, drawn from the 2020-2024 release, table B25034 for year structure built and table B25035 for median year structure built.
Rebates & credits
What rebates can Niwot homeowners claim?
Xcel Energy — the gas and electric utility here:
- Xcel Energy Insulation and Air Sealing Rebate — pays a percentage of project cost for gas-heat customers against per-measure caps; ask your contractor for the current rate. A reduced tier applies to Xcel electric customers with central air conditioning whose heating fuel is not provided by Xcel Energy. Requires a participating contractor and, unless a first blower door test already finds the home tight enough by Xcel Energy's own measure, a documented 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.
For current Xcel rebate amounts and program rules, see the Xcel Energy insulation and air-sealing rebates page. Eligibility may depend on program funding levels and qualifying product specifications.
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 — ask what R-value your contractor is quoting to, in writing, and confirm the figure your permit is reviewed against with the City of Longmont's building department. (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 tier, which is open only to homes on Xcel electric service that have central air conditioning and whose heating fuel is not provided by Xcel Energy. (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, Xcel pays a percentage of project cost against per-measure caps — ask your contractor for the current rate. A reduced tier applies only where Xcel provides the electric service, the home has central air conditioning, and the heating fuel is not provided by Xcel Energy. Xcel requires a participating contractor and, unless a first blower door test already finds the home tight enough by Xcel Energy's own measure, a documented 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