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Like glass tiles, you will not need to seal most porcelain tiles, particularly if the porcelain is already glazed. It depends on quality. Porcelain is very water resistant, but it is not 100% waterproof. To avoid staining, some homeowners use a penetrating sealer. It is also a good idea to seal your grout. Unless you use epoxy grout, grout is very porous and can harbor bacteria, mold, and mildew.

The easiest tile size to install is large tiles, and they’re easier to install than small tiles—the job is faster and simpler when there’s less placing, adhering, and grouting to do. However, when tiles get really big, they’re more difficult to handle, cut, and fit. Standard floor tile sizes are 12-by-12 inches, 18-by-18 inches, and 12-by-24 inches.

The average cost for tile installation is about $2,000, with a typical price range between $500 and $6,500. On a per-square-foot basis, you can expect to pay between $5 and $45 for installation.

Several factors influence the total cost, including:

• Installation Site: Costs vary for different areas. Common project costs are: kitchen floor ($870–$6,100), countertop or backsplash ($500–$3,000), bathroom floor ($300–$2,400), or shower wall ($225–$2,000).

• Tile Type and Quality: The material significantly impacts price. For example, standard ceramic or travertine tile can cost about $1 per square foot, while luxury options like marble can be as much as $350 per square foot for the material alone.

• Project Size and Complexity: The total square footage, the complexity of the pattern, and the shape of the tile (e.g., square, rectangle, hexagon, mosaic) will affect labor and material costs.

• Site Preparation: The amount of prep work needed, such as removing old tile or installing a new subfloor or backer board, can add to the final price.

• Tile Characteristics: The tile's durability rating and porosity can also influence the price.

• Location: Labor rates vary by geographic location.

The tile spacing you should use will depend on the tile and where you’re installing it. Choosing the right tile spacers to maintain a consistent gap between your tiles is tricky. Generally, tile spacing shouldn’t be less than 2 millimeters on walls and 3 millimeters on floors because of stress relief requirements. Getting it wrong can result in uneven tiles and early repairs.