For a standard straight-lay installation in a simple rectangular room, 5–10% waste is typically sufficient. If you're installing at a 45-degree angle or in a room with many obstacles like closets and doorways, plan for 10–15%. For herringbone or chevron patterns, budget 15–20% waste to account for the additional angled cuts required.

Most boxes of luxury vinyl plank flooring cover between 20 and 30 square feet, though this varies by manufacturer and plank size. The exact coverage is always printed on the box label. Common coverages include 20 sq ft, 23.64 sq ft, and 24.5 sq ft per carton.

Yes, vinyl plank flooring can be installed over most existing hard surfaces including tile, hardwood, concrete, and existing vinyl, as long as the subfloor is clean, dry, level, and in good condition. You should not install over carpet. Always check the manufacturer's guidelines for approved substrates and whether underlayment is required.

Break the room into smaller rectangular sections and measure each one separately. Calculate the square footage of each section (length × width), then add them all together for the total area. For L-shaped rooms, split into two rectangles. For rooms with alcoves or bay windows, measure those as additional rectangles and add them to your total.

Yes, always purchase extra beyond your waste percentage. Keep at least one unopened box after installation for future repairs because matching the exact color and lot can be difficult later. Dye lots can vary between manufacturing runs, so buying everything from the same batch ensures consistent color throughout your project.