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According to DCMR 12, the DC building code, it's 30 inches below grade.

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11y ago
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11y ago

I expect roughly 14 inches in elevations below 1700 feet.

Above that up to 3500 feet , I expect 18 to 24 inches ,

above 3500 feet expect 25 to 36 inches deep .

John Queen

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Wiki User

13y ago

4 foot

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Wiki User

11y ago

12 in

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Anonymous

Lvl 1
3y ago

6 inches

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Anonymous

Lvl 1
3y ago

1 ft

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Anonymous

Lvl 1
3y ago

7 inches

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