Residential window cleaning in Boulder means every visible pane inside and out, plus screens off the frame and washed by hand, tracks vacuumed, sills wiped, and frames detailed. What changes from town to town is not the checklist — it is what is actually on the glass. In Boulder, at 5,328 feet on Boulder's Barker Reservoir and Silver Lake snowmelt supply, the work is shaped by airborne debris more than anything else, and the sections below explain exactly how.
Quick answer
Residential window cleaning means a full clean of every visible window, inside and out, including screens, sills, and frames.
The checklist is the same everywhere. What is on your glass is not. These are the conditions that actually shape this job in Boulder — each one is true here and false in plenty of other towns we serve.
Boulder is supplied by Boulder's Barker Reservoir and Silver Lake snowmelt supply — mountain snowmelt, and notably soft. That is genuinely good news and it means hard-water spotting is rarely the complaint here that it is in the Denver Basin communities or in New Mexico. What it does not mean is that Boulder windows stay clean on their own. Soft water still carries the dust, pollen, and road film that lands on the glass; it simply does not add mineral of its own. The practical result is that cleaning here is about removal rather than restoration, and a straightforward wash gets a better result than it would fifteen miles south.
Boulder sits in conifer country, and needles are a different problem than deciduous leaf. They pack tighter, they shed year-round rather than in one autumn window, and they carry pitch. Pitch bonds to glass and frames and does not respond to detergent — it needs a solvent, and it must never be scraped dry. Needles also block weep holes, the small drainage slots at the bottom of a window frame, and a blocked weep hole holds water against the sash all winter. That is how frames rot in the mountains while the same window in the city lasts decades.
Boulder's older housing stock includes original wood sash with hand-set glazing, and in the oldest homes the putty failed decades ago and was painted over — meaning the glass is held in place substantially by paint. Cleaning that aggressively can dislodge a pane. We check first, work gently, and tell you what we find, because discovering a glazing failure with a squeegee is the expensive way to learn about it.
Boulder has a lot of custom and view-oriented homes — two-story window walls, clerestories, and big fixed panes aimed at whatever the lot was bought for, frequently on a slope with nowhere level to set a ladder. Those are the windows the owner cares about and the ones most often skipped, because reaching them safely takes planning and equipment. We work out access before quoting and list those panes as their own line item, so the cost of the view is visible rather than buried in a per-window average that either overcharges the easy glass or quietly leaves the hard glass dirty.
Every visible window in the home — interior and exterior surfaces, plus screens, sills, and frames. We don't skip the kitchen window above the sink, the basement egress, or the garage windows.
Screens are removed, washed by hand, and reinstalled. Bent screen splines are corrected; severely damaged screens are flagged for our optional re-screening service ($25–$45 per window).
Sills (the inside ledge) and tracks (the bottom channel where the window slides) are vacuumed clean of dirt, dead bugs, and dust. This is the part that DIY cleaning almost always misses.
Frames are wiped down — the painted or wooden border around the glass — including the corners where mineral deposits and pollen accumulate.
Pre-walk and final-walk: a Sonlight technician walks the home with you (if present) at the start to flag anything unusual, and again at the end to verify the work meets your standard.
Enter your address. Our autoquoter pulls property details from public records and returns a real, firm price in seconds. No callback, no in-home estimate.
Choose any open day on our calendar in the next 14 days. Same-day booking cuts off at 6 PM the prior evening. SMS + email confirmation arrives instantly.
Our crew shows up within the time window, in branded trucks with $2M liability and workers' comp. The lead tech walks the property with you (if home) before starting.
Interior windows are squeegeed dry with hand-towels and finished by hand. Exterior is cleaned with a purified-water rinse system that prevents new mineral spotting.
We walk the home with you (or send photos if you're not there). Pay by card, ACH, or check. If anything looks off within 24 hours, we come back free.
Most Boulder properties land between $315 and $500 for this service. That band is derived from real Boulder jobs, not a national average — which is why it differs from the number you would see on our page for a neighboring town. Here is how the job profiles break down:
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Student rentals and Greek houses; fast turnover service for landlords.
Bungalow-belt homes with original wood storms; rebed and reset every spring.
Older homes with mature trees — heavy pollen on east-facing windows.
Modern condos and lofts with industrial-height windows.
Mix of 1950s ranches and new infill; flat lots, easy access.
Table Mesa neighborhoods with Flatirons views; west-facing windows hit hardest by chinook winds.
See every neighborhood and the full local guide on our Boulder window cleaning page.
Colorado's mile-high+ altitude means UV exposure is 25-40% stronger than at sea level. Mineral deposits etch into window glass faster, and window seals fail sooner. Twice-yearly professional cleaning is the practical baseline — quarterly for west-facing exposures or homes near sprinkler overspray.
Front Range water averages 50–150 ppm hardness depending on city (Denver Water ~70 ppm, Colorado Springs Utilities ~125 ppm). The water is also slightly alkaline (pH ~8) which etches the silica in glass faster than acidic water of the same hardness.
Spring pollen (cottonwood, pine) and June cottonwood fluff are the heaviest contamination periods. Most Front Range homeowners book a major clean in late May or early June after pollen drops, then a second in October before the holidays.
Twice a year covers most Boulder homes. Spring after pollen drops and fall before the first hard freeze are the two appointments that do the most work.
Both, included. Screens come off the frame and are washed flat rather than brushed in place, and tracks are vacuumed dry before any water goes on the window.
Most 2-story Colorado homes (1,800–2,400 sqft, ~22–30 windows) take 2–3 hours with a 2-tech crew. Larger custom homes can run 4–6 hours. We'll give you a specific time window when we confirm the booking.
No. As long as we can access exterior gates, side yards, and any rooms you want cleaned interior, we're fine. We text you when the crew arrives and when the job is complete with photos. Most of our recurring customers are not home during the appointment.
Full service = interior + exterior + screens + sills + frames. Exterior-only = exterior surfaces only, no interior access required. Exterior-only runs about 65-75% of the full-service price and is faster to schedule. Most customers do full service in spring and exterior-only in fall.
Yes. We use water-fed pole systems that reach up to 4 stories, and rope-descent gear for taller buildings. There's no upcharge for height on a typical 2-story residential job — height pricing only kicks in for homes over 3 stories or with bosun-chair access requirements.
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