How to Measure Flooring Accurately
For a rectangular room, simply multiply length times width to get the square footage. But most rooms are not perfectly rectangular. Closets, alcoves, bay windows, and angled walls all add complexity. The best approach is to sketch the room on paper, divide it into manageable rectangles, measure each one, and add them together. For L-shaped rooms, split at the corner into two rectangles. For rooms with a closet, measure the main area and the closet separately, then add them.
Always measure at the widest points, including into doorways and closet openings. Measure along the floor, not at waist height, since walls are not always plumb. Record measurements to the nearest inch and round up to the next foot when calculating. If you are replacing existing flooring, pull back a corner to check the subfloor condition before ordering materials. For homes with carpet that you are replacing with hard surface flooring, account for the height difference at transitions to adjacent rooms.
Flooring Cost Comparison by Material
Laminate flooring is the most budget-friendly option at $1-5 per sq ft for materials. It looks like wood or stone but is actually a high-resolution photograph under a clear wear layer. Laminate is easy to install as a floating floor (no glue or nails) but is not waterproof, making it unsuitable for bathrooms and basements. Luxury vinyl plank (LVP) costs $2-7 per sq ft and is fully waterproof, making it the most popular choice for whole-house installations. It handles spills, pet accidents, and humidity without warping.
Engineered hardwood runs $3-10 per sq ft and provides real wood surface with a plywood core that resists expansion. Solid hardwood is $5-15 per sq ft and can be sanded and refinished multiple times over its 50+ year lifespan. Tile flooring costs $1-20 per sq ft for materials alone and requires a tile calculator to estimate properly since tiles come in many sizes. Professional installation adds $2-5 per sq ft for laminate and LVP, $4-8 for hardwood, and $5-12 for tile due to the labor-intensive mortar and grout work.
Waste Factor and Why It Matters
The waste factor accounts for cuts at walls, doorways, and corners, plus mistakes and damaged planks. A standard straight-lay pattern needs 10% waste. Diagonal (45-degree) installation requires 15% because every plank along the walls gets cut at an angle. Herringbone patterns waste 15-20% due to the precise angle cuts. Rooms with many angles, curved walls, or built-in cabinets should use 15-20%. The waste factor does not mean the material goes in the trash; it means you will have leftover pieces from cuts that cannot be reused elsewhere.
Ordering with the correct waste factor is especially important for discontinued or special-order flooring. If you run short by even one box on a discontinued style, you may need to replace the entire floor. Always order from the same batch number to ensure color consistency across all boxes. When the delivery arrives, check that all boxes match the batch number printed on the packaging before the driver leaves.
DIY vs Professional Flooring Installation
Click-lock laminate and LVP are the most DIY-friendly flooring types. A competent homeowner can install 200-400 sq ft per day with basic tools: a saw, tapping block, pull bar, and spacers. The learning curve is short, and mistakes are relatively easy to correct by disassembling back to the error point. Total cost for a 300 sq ft room: $400-1,200 in materials plus $50-100 in tools you may need to buy. Compare that to $1,000-2,400 for professional installation of the same space.
Hardwood and tile are significantly harder to install correctly. Solid hardwood requires a nailer ($200-400 rental for a flooring nailer), precise moisture acclimation (2-7 days), and expansion gaps at all walls. Tile requires mortar mixing, precise spacing, leveling, and grouting, plus a wet saw ($50-80/day rental). Poorly installed tile cracks, and poorly installed hardwood cups and gaps. For these materials, professional installation is worth the investment. Use our paint calculator to budget repainting baseboards and trim after new flooring installation.
Subfloor Preparation Before Installing Flooring
The subfloor is the foundation of your flooring installation and the most common source of problems. For any hard surface flooring, the subfloor must be flat within 3/16 inch over a 10-foot span. Use a long straightedge to check, and mark high spots with a pencil. Grind down high spots with a concrete grinder or belt sander (for wood subfloors). Fill low spots with self-leveling compound ($30-50 per bag, one bag covers about 50 sq ft at 1/8 inch thick). On concrete slabs, test for moisture using a calcium chloride test kit ($15-30) before installing any wood-based flooring.
Remove existing flooring completely, including staples, nails, and adhesive residue. Sweep and vacuum thoroughly. Install a moisture barrier (6-mil polyethylene for concrete, roofing felt for wood subfloors) before laying the new flooring. If the existing subfloor is damaged or uneven beyond repair, install a new layer of 1/4-inch plywood underlayment over the entire floor. This adds $1-2 per sq ft but ensures a flat, stable surface. For basements with moisture issues, consider a deck calculator for an elevated subfloor system instead.
Common Flooring Mistakes to Avoid
Not acclimating wood flooring to the room is the most expensive mistake. Solid hardwood needs 3-7 days in the installation room to adjust to the temperature and humidity. Skipping this step causes the planks to expand or contract after installation, creating gaps or buckling. Engineered hardwood needs 48 hours. Laminate and LVP need 24-48 hours. Stack the boxes flat (not on edge) in the room with the packaging open so air can circulate around the planks.
Forgetting expansion gaps at walls is the second most common error. All floating floors expand and contract with temperature and humidity changes. Without a 1/4-inch gap at every wall and fixed object, the floor buckles when it expands in summer humidity. Use spacer wedges during installation and remove them before installing baseboards. The baseboard covers the gap but must not be nailed through the flooring. Also ensure door casings are undercut so the flooring slides underneath, rather than butting against them.