Quick answer: Most visible commercial buildings benefit from a full facade and window wash one to four times a year, depending on climate, traffic, and how much the property's appearance matters to the people walking past it. Homes typically need it less — once or twice a year is common. There's no single correct interval; it depends on how fast grime actually builds up on your specific building.
What actually determines the right interval
Climate and exposure. Coastal salt air, urban pollution and soot, heavy pollen seasons, and wet climates that favor algae growth all accelerate how fast a surface visibly dirties.
Visibility and foot traffic. A street-facing retail storefront or a Class A office lobby makes a first impression constantly — it needs more frequent attention than a low-visibility warehouse or back-of-building wall.
Surface material. Glass and smooth, light-colored facades show streaking fast. Textured stone and brick hide grime longer, but they're not immune to it — buildup just becomes visible later, and often harder to remove once it does.
Nearby vegetation. Trees overhead mean sap, pollen, and bird activity — all of which shorten the interval before a wash is noticeably needed again.
A general starting schedule
As a starting point, not a rule: high-visibility commercial properties (retail, Class A office, hospitality) often land on a quarterly cadence. Standard commercial and multifamily buildings commonly land closer to twice a year. Homes are usually fine on an annual or biannual schedule, often timed around a seasonal transition. Roofs specifically tend to need less frequent attention than facades and windows — buildup is slower to start but more visible once it does, which is why an annual inspection with cleaning as needed is a reasonable default.
Signs you're overdue, regardless of schedule
Any fixed schedule is a starting estimate — the property itself will tell you when it's actually due. Visible streaking from the street, algae in shaded areas, and comments from tenants or visitors are all signs worth acting on sooner rather than waiting for the calendar.
Frequently asked
Is there a standard industry recommendation for wash frequency?
There's no single universal standard — it depends on the building's environment. That said, quarterly to twice a year is a common range for visible commercial properties, and once or twice a year is typical for most homes.
Does a maintenance plan actually save money compared to one-time washes?
Steady maintenance keeps grime from setting in and becoming harder to remove, and it avoids the compounding cost to curb appeal and tenant impressions that builds up between infrequent, one-off cleanings.
Can weather delay a scheduled cleaning?
Yes. Professional operators reschedule around unsafe wind or rain conditions rather than clean through them.
One-time wash or an ongoing maintenance plan — quarterly, monthly, or a cadence built around your property.
See plan options