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Walk around the front, back and sides. Count each separate piece of glass: a window split into 4 by a grid counts as 4. If the grid is sealed inside the glass, count it as 1.

• Small

  Under 4 sq ft — bathroom windows, small panes in a grid

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• Standard

  4–15 sq ft — a typical bedroom window

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• Large

  15–30 sq ft — picture windows, sliding-door panels

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• Oversized

  30+ sq ft — floor-to-ceiling great-room or A-frame glass

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Count each mirror by size. For a gym or studio mirror wall, count each panel. Skip this step if you don’t need mirrors.

• Small mirror

  Under 4 sq ft — a vanity or entryway mirror

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• Standard mirror

  4–15 sq ft — a typical bathroom or closet-door mirror

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• Large mirror

  15–30 sq ft — a wide bathroom mirror or one gym-wall panel

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• Oversized mirror

  30+ sq ft — a single huge mirror

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Count the panels on your roof. Skip this step if you don’t have solar.

• Solar panels

  Rooftop panels on a home or business

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• Screens

  Removed, washed and put back

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• Window tracks

  The channel a sliding window runs in

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• Panes with hard-water spots

  White mineral spots, often from sprinklers

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• High or hard-to-reach panes

  Glass that needs a ladder on the inside

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