What happens during the in-home assessment?
A contractor worth hiring starts by looking, not guessing. That means getting into the attic, crawl space, or wall cavity in question and checking what is actually there: how deep or thick the existing insulation is, what condition it is in, whether it has settled, gotten wet, or been damaged by rodents, and whether it is even the right type for the space.
A thorough assessment also looks past the insulation itself. Air leaks around can lights, plumbing penetrations, the attic hatch, and top plates matter as much as insulation depth, since insulation alone does not stop air movement. Ventilation gets checked too — soffit and ridge vents that are blocked or missing change what kind of insulation approach makes sense. Skipping this step is the most common shortcut a rushed quote takes. It is worth doing well: EPA estimates homeowners save an average of 15% on heating and cooling costs by air sealing their homes and adding insulation in attics, floors over crawl spaces, and basements, and that figure assumes the air sealing and insulation were both done, not just one or the other.
What should a quote actually spell out?
A quote scoped from a real assessment should name the material being proposed, the target depth or R-value, and exactly which areas of the home are included and excluded. 'Attic insulation' as a line item is vague; 'blow cellulose to R-49 across the main attic, excluding the unconditioned storage area' is specific enough to hold the contractor to later. The model 2021 IECC (R402.1.2) sets attic insulation minimums at R-49 to R-60 for Climate Zone 5, which is a reasonable benchmark to ask how a quoted depth compares against, even though it is a model-code figure rather than a statement of what Longmont's adopted code specifically requires.
It is reasonable to ask why a particular material or depth is being recommended, and a contractor who did a real assessment should have a specific answer rather than a generic one. It is also worth asking whether air sealing is included in the scope or quoted separately, since the two are often bundled but not always.
What actually happens on install day?
Crews typically protect the work area first — laying down floor covering along the path to the attic access or crawl space entry, and setting up equipment like a blower truck or hose staged outside or in a garage. From there, the material gets installed to the depth and coverage specified in the quote, with attention to maintaining clearance around recessed lights, flues, and other heat-producing fixtures that need it.
Cleanup follows the install, not just at the very end of the day — a decent crew keeps the work area reasonably tidy throughout rather than leaving a mess for the final hour. For a single attic on an average home, this whole process often fits into a single day, though crawl spaces, multiple areas, or removal work ahead of new insulation can extend that.
What does a properly finished project look like?
Done should mean more than the crew packing up and leaving. A finished project should come with some form of documentation — photos of the completed work, a summary of what material went in and at what depth or R-value, and confirmation that the scope matches what was quoted. That documentation matters later, whether for a homeowner's own records, a future sale, or a rebate application through a utility program.
It is also fair to expect a brief walk-through or explanation of what was done, including anything the contractor noticed along the way that falls outside the original scope — a bath fan vented into the attic instead of outside, for example, or a section of duct that was disconnected. A contractor who flags issues like that instead of insulating over them is doing the job right.
Sources
What the data says
According to ENERGY STAR, “EPA estimates homeowners save an average of 15% on heating and cooling costs by air sealing their homes and adding insulation in attics, floors over crawl spaces, and basements.”
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.”
Take the next step
What happens after you request a quote?
Expect a scheduled in-home assessment first, followed by a written quote that names the material, target depth, and included areas before any install date gets set.
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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 which programs your specific address qualifies for. Xcel and Efficiency Works are separate programs with separate paperwork, and not every address qualifies for both. (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. Longmont Power & Communications electric customers may separately qualify for an Efficiency Works rebate — check your bill to see which utility serves your address. Boulder County EnergySmart pays a third, income-qualified-only rebate as of January 1, 2026.) (4) Removal scope — older homes often need old insulation removed before new install. If a quote skips all four, get another quote.
Frequently asked
Common questions about the insulation project process
How long does a typical attic insulation project take?
Most single-attic jobs on an average home are completed within a day. Larger scopes, multiple areas, or removal work ahead of new insulation can extend the timeline, which a contractor should flag during the quote rather than as a surprise on install day.
Does someone need to be home during the installation?
Access to the work area is what matters most, along with being available if the crew has questions. Specific expectations vary by contractor, so it is worth asking directly when scheduling.
Should air sealing happen before or during insulation work?
Air sealing is generally addressed before or alongside insulation installation, since sealing leaks after insulation is in place is harder to do well. Ask whether a quote includes air sealing or treats it as a separate step.
What should be asked before agreeing to a quote?
What material and depth are being proposed, which areas are included, whether air sealing is part of the scope, and what documentation comes at the end are all reasonable questions to ask before signing off.
Is a permit needed for a typical insulation project?
Requirements vary by project type and jurisdiction, and this is a question to ask the contractor directly rather than assume either way, since it depends on the specific scope of work.
What happens if existing insulation needs to be removed first?
Removal is its own step that should be scoped and quoted separately from new installation, since it changes the timeline and access requirements. See the insulation removal page for how that process typically works.
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