Sonlight Window Cleaning serves Longmont and surrounding Boulder County communities with professional residential and commercial window cleaning. From historic Old Town near Main Street to the new neighborhoods in Prospect, we deliver spotless results backed by 350+ five-star reviews.
Longmont sits at 4,979 feet between Boulder and Loveland, where the high plains meet the foothills. The city has grown rapidly in the last decade, with new construction in Prospect, Lake McIntosh, and the Solos communities. But its core is the historic Old Town district, with Victorian and craftsman-style homes dating to the 1880s.
Our crew works every Longmont subdivision — from the brick Victorians on Main Street, to the bungalow-belt streets near Roosevelt Park, to the larger lots out by Lake McIntosh, to the master-planned Prospect community with its eco-modern designs. We've held recurring contracts with Longmont property managers and HOAs.
Sonlight Longmont services include interior + exterior window cleaning, screen removal and cleaning, gutter cleaning, pressure washing, soft wash, and solar-panel cleaning. Fully insured ($2M general liability + workers' comp) with a 24-hour satisfaction guarantee.
Pricing is per-property — based on your home's square footage, number of windows, stories, and accessibility. Here's a real example for Longmont:
Example: 1,900 sqft 2-story Wolf Creek home, 24 windows
Interior only
$175
Exterior only
$230
Both (most popular)
$360
Want exact pricing for YOUR home in Longmont? Get an instant quote in 30 seconds — no callback, no in-person estimate. For a deeper breakdown of what affects window cleaning prices, see our 2026 Denver pricing guide.
Longmont sits at the edge of the foothills, and chinook winds carry pine pollen from the canyons onto west-facing windows from late March through May. Cleans done in this window don't hold; we recommend late-May or early June.
Longmont Water averages ~95 ppm hardness with some seasonal variability. Sprinkler systems on south- and west-facing windows leave mineral spots within one summer.
Mid-June cottonwood fluff sticks to glass for several weeks; we usually wait until late June for major Longmont cleans.
We've worked every part of Longmont — here's what to expect in your area.
1880s Victorians and Craftsman bungalows; hand-clean only on original glass.
Master-planned eco-modern community with HOA-coordinated cleans.
Larger lots with lake views; bigger window counts and custom builds.
Newer subdivisions with consistent home profiles.
Family-friendly streets; predictable pricing.
Active-adult community with sub-HOA standards.
Larger rural-style lots between Longmont and Boulder.
1970s/80s established homes with mature trees.
New construction; deep first cleans within 90 days.
Storefronts and offices; recurring commercial accounts.
Real Sonlight crew on real Front Range jobs — no stock photos. Same crew that will show up at your Longmont home or business.
Complete window cleaning inside and out, including sills and frames.
Learn more →Screen removal, washing, and reinstallation included with full-service cleans.
Learn more →Professional gutter and downspout cleaning to prevent water damage.
Learn more →Exterior surfaces, driveways, patios, and siding cleaned and restored.
Learn more →Safe cleaning to restore panel efficiency. Dust reduces output up to 25%.
Learn more →Low-pressure exterior wash for stucco, siding, decks, and fences.
Learn more →We're routinely in Longmont's neighboring communities — same crew, same pricing structure, same satisfaction guarantee. Listed by distance from Longmont:
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Most Longmont homes run $200–$500 for full-service. A 1,900 sqft 2-story Wolf Creek home is around $360 interior + exterior with screens.
Every Longmont neighborhood: Old Town, Prospect, Lake McIntosh, Wolf Creek, Mountain Brook, Spring Creek, Renaissance, Solos, Niwot-adjacent rural areas, Centennial Park area, and the Hover Crossing commercial corridor.
Yes. We routinely service Niwot, Erie, Lyons, Hygiene, and the surrounding Boulder County communities.
Twice per year minimum. Foothill-edge homes (Prospect, Wolf Creek) benefit from a third clean after the dry-windy season in March.
Yes. Original-glass Victorians and Craftsman bungalows are hand-cleaned only — no power tools, no aggressive scrubbing. We've worked on registered-historic homes off Main Street.
Yes. Active construction leaves fine silica dust on every window. New-build owners typically book a deep first clean within 90 days of move-in.
We staff Longmont and Boulder County separately from Denver; same-week openings are normal.
Yes. $2M general liability + Colorado workers' comp. Certificate of Insurance emailed to HOA property managers same-day on request.
Want more answers? See our guide to how often Colorado windows need cleaning or our hard-water stain removal guide.
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