Do you keep the existing metal roof? Or replace with new metal panels? Or install asphalt shingles?

Pricing for new metal panels or asphalt shingles is readily available from local roofers.

For a maintenance coating (means few leaks or extra repairs), $4.50 per square foot is a planning figure.   For a truly worn tin roof, (means double material and work), $8.50 per square foot.

For pricing and other FAQ, check this page .

Here’s a quick method to estimate roof area–take the width and length of your house, then add 50%.  Not a perfect method, but should offer an idea