Save and comment SHOP below for a link. This vinyl trim window mullion DIY took my builder-grade windows from basic to custom for under $30. I started with a classic grid in the living room, then got a little braver and did a cottage-style diamond pattern in the kitchen. Same DIY, two totally different vibes. Cut to size, peel, stick onto a clean window… and you’re done. Ten out of ten, would do again. DIYHome WindowMullions BuilderGradeToCustom CottageStyle HomeDIY

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