What to buy before install day, the items everyone forgets, and how to shop once instead of twice.
Most flooring projects don't go over budget at the flooring aisle. They go over budget on the second trip — the one you make mid-install because you forgot transition strips, or ran out of underlayment, or discovered your subfloor needed a vapor barrier after the planks were already stacked in the living room.
A good shopping list prevents the second trip. Here's everything that belongs on it, in the order you'll actually need it — and why each item earns its place.
Every quantity on this list depends on one number: your real square footage. Measure length × width for each room, break odd shapes into rectangles, subtract anything you're not flooring, and add your waste factor — 10% for a straight lay, more for diagonal or herringbone patterns.
Do this first. A shopping list without quantities is just a wish list, and guessing quantities in the store is how projects run short.
Take your square footage with waste included, divide by the coverage printed on your product's box, and round up to whole boxes. Then — and this is the part people skip — buy everything in one purchase. Flooring is manufactured in batches called dye lots, and boxes from different lots can shade differently. One order, one lot, one consistent floor.
If you want the full box math with worked examples, we wrote a whole guide on it: How Many Boxes of Flooring Do I Need?
If your planks have an attached pad, separate underlayment usually isn't needed — but check your product's installation guide, because doubling up can void warranties. If there's no attached pad, you'll need underlayment rolls: divide your square footage by the roll's coverage (commonly around 100 sq ft) and round up.
Every doorway where your new floor meets a different surface needs a transition strip — and every wall needs the gap at the edge covered by baseboard or quarter round. These are small line items that almost never make the first draft of anyone's list, and they're the most common reason for the second store trip.
Walk the space and count: doorways to carpet, doorways to tile, doorways to other rooms at different heights, plus the linear feet of wall. That count goes on the list next to transition strips and trim.
If this is your first floating floor, you likely don't own the small tools that make click-lock installation go smoothly. Most of them come bundled in a single installation kit — cheaper than buying pieces individually.
After everything is installed and the room is put back together, one unopened box goes in the garage. Not for the install — for year three, when a plank gets scratched or a pipe leaks. A matching spare from your original dye lot turns a repair into a five-minute swap. Without it, you're hunting for a discontinued product and hoping.
Everything at once, for two reasons: your flooring stays in one dye lot, and delivery or restocking delays can't stall the project mid-install.
Ask what's included in their quote. Some installers supply underlayment, transitions, and trim; many don't. Get the list of what you're responsible for buying in writing before you shop.
Possibly — leveling compound, patching, or plywood repairs are common surprises once old flooring comes up. You won't know until demolition, so hold a small buffer in the budget rather than buying materials in advance.
Unopened boxes, often yes — but policies and restocking fees vary by retailer. Keep receipts and don't open boxes until you need them.
Enter your rooms once and the calculator builds this shopping list for you — boxes, underlayment, spare box and all.
Use the All-In Flooring Calculator →Budgeting the whole project? Read Why Flooring Costs More Than the Sticker Price →
All-In Flooring Calculator — allinflooringcalculator.com
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