building permit
US /ˈbɪl.dɪŋ ˌpɝː.mɪt/
UK /ˈbɪl.dɪŋ ˌpɝː.mɪt/
1.
official permission to build, extend, or demolish a building
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You need a building permit before you can start construction.
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Obtaining a building permit can be a lengthy process.