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This question already has an answer here:

So I made this structure by subdividing a plane and elevating parts to make hallways:

enter image description here

Then I realized that I wanted to make the walls have a certain thickness. Is there a way to do this? Extruding didn't really work for me.

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marked as duplicate by ideasman42 May 6 '14 at 8:08

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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Solidify Modifier

You can do this by adding a Solidify modifier to your planes:

enter image description here

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