I made new stairs for our backdoor during last summer.
( Fence & handrail is still old )

Frame is made using steel, and covered with wood.

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Wood that i used wasn't very thick, but it does what its intented. Still material for the steel frame was much cheaper than this somewhat thin wood.
Wood was 2.78€ / M ( 3 foot ) when it was two years ago about 0.80 / M !