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The thickness of a wall would depend on the construction. Modern houses would probably have exterior walls not much thicker than a brick. As a rule the older the house (and colder the climate) the thicker the walls. I've seen exterior walls 4 feet thick in medieval welsh cottages for example.

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14y ago
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14y ago

The average size for an interior wall is about 4.75 in. and exterior walls are about 8 in. thick.

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13y ago

320mm standard

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Q: What is the average residential inside and outside wall width?
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