It depends on the fireplace size. The link above is good. I have a gas fireplace, so I don't have a hearth. For a wood burning fireplace, the width has to be wider than the firebox and deep enough to catch sparks.
We would greatly appreciate your assistance in selecting a new color for the fireplace wall.The color of our living room walls and fireplace wall is Sherwin Williams ...
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This site has some answers that might help you: https://www.hunker.com/13402164/dimensions-of-standard-hearths
Here are some ideas as well to look at in addition to Holly's! Good luck.
https://inspectapedia.com/chimneys/Fireplace_Hearth_Specifications.php
https://www.bespokemarblefireplaces.co.uk/guides/the-average-height-for-a-fireplace-hearth-base-section-of-fire-surround-from-the-floor-is-50mm-total-thickness.html
https://www.hunker.com/13402164/dimensions-of-standard-hearths
It depends on the fireplace size. The link above is good. I have a gas fireplace, so I don't have a hearth. For a wood burning fireplace, the width has to be wider than the firebox and deep enough to catch sparks.
Consult the Building Regulations for restrictions on proximity of combustible materials