A seam cutting assembly includes a holder that has a blade slot therein, a cutting space and a hooked end extending partially across the cutting space. The hooked end abuts a wall having a wall covering being positioned in the cutting space. A blade is provided and the blade is slidable into the blade slot. The blade extends into the cutting space when the blade is positioned in the blade slot for cutting the wall covering. The hooked end is positioned beneath the blade when the blade is inserted into the blade slot to inhibit the blade from cutting the wall. A sleeve is slidable over the holder and the blade when the blade is positioned in the blade slot such that the sleeve retains the blade in the blade slot.