Sioux Falls & Southeastern South Dakota
Whatever the season throws at Sioux Falls, your walls hold the line.
Knight Insulation installs spray foam, blown-in, and batt insulation for homes and businesses across the Sioux Falls area — sized for South Dakota winters, not a mild-climate average.
Family-run · Free on-site estimates · Residential & commercial
Recent work
Two jobs, two different answers.
Every insulation job calls for a different method depending on the framing, the climate zone, and what the space is used for. Here’s a look at spray foam and batt insulation, freshly installed.
Services
One job: keep the temperature you paid for inside your building.
Every service below solves that from a different angle — pick the one that matches your project, or call and we’ll tell you which one actually applies.
Spray Foam Insulation
Closed and open-cell spray foam for rim joists, crawlspaces, and new-construction walls that need an air seal, not just an R-value.
See spray foam →Blown-In Insulation
Cellulose or fiberglass blown into attics and closed wall cavities — the fastest way to bring an older Sioux Falls home up to a modern R-value.
See blown-in →Attic Insulation
Attics lose more heat than any other part of the house. We check ventilation and air-sealing first, then insulate so it actually stays put.
See attic insulation →Wall Insulation
Batt, rigid board, and dense-pack options for new walls, additions, and garages — matched to what the framing and the budget actually call for.
See wall insulation →Commercial Insulation
Metal buildings, shops, and commercial builds in and around Sioux Falls, scheduled around your contractor’s timeline.
See commercial →Free On-Site Estimates
We walk the space, measure what’s actually there, and give you a straight number — no upsell script.
Request an estimate →What actually sets us apart
We don’t insulate over a problem.
Most insulation callbacks trace back to one shortcut: installing new material straight over rodent damage, pest contamination, or an air leak instead of fixing it first. Owner Wymond Hall built Knight Insulation around not doing that.
- Damaged or contaminated material removed before anything new goes in
- Entry points and air leaks addressed, not just covered
- The job that actually performs, not the job that just looks finished
- Owner-operated — no subcontracting, no rotating crews
How a project runs
From first call to final walk-through
Call or send the form
Tell us what you’re insulating — a room, an attic, a whole build — and roughly when.
Free on-site estimate
We look at the space in person, check current insulation and air-sealing, and give you a firm number.
Insulation installed
Spray foam, blown-in, or batt — whichever method fits the space, installed by our crew, not a subcontractor.
Walk-through & cleanup
We show you what was done and clean up the site before we leave.
Ready for a free estimate?
Call, text, or send the form — we’ll get back to you the same day.