Look for Spanish tiles that match your existing tiles as closely as possible. The colors for clay tiles can vary, and a few mismatched pieces can stick out like a sore thumb. Check with various manufacturers and get samples to ensure the best match.
Use a pry bar to pull up loose Spanish tiles that need replacement. The only time they need replacement is if they have suffered surface damage.
Install the new Spanish tiles using copper nails. These are strong enough to hold up the heavy clay tiles. Note that galvanized nails are not strong enough to install the Spanish tiles and will ultimately fail.
Expect to pay between $11,900 and $21,000 for a complete replacement of a Spanish roof on a 1,700 to 2,100 square foot home. This should include professional installation cost. Custom-glazes or custom-ordered shapes will cost more like $17,000 to $60,000 for complete replacement.