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Building a new staircase can take anywhere from a few days to a few weeks, depending on the complexity of the design, materials, and whether an old one needs to be demolished. Straight staircases are quicker to build than curved or spiral staircases, which require more intricate design and precise measurements.

It depends on whether you’re looking at residential or commercial buildings. For residential buildings, the 2018 International Residential Code asks for a maximum riser (or rise) height of 7 3/4 inches and a minimum tread depth (or run) of 10 inches.

For fixed stairs in commercial buildings, OSHA requires a rise between 6 and 7.5 inches, with a run between 10 and 14 inches. The standards are different for spiral staircases.

You should place a layer of thick landscaping fabric directly over the concrete slab and then a thin layer of leveling sand over that to protect the pavers from moisture. For border pavers, you should plan on locking them in place with polyurethane adhesive. This will prevent them from shifting under foot traffic.

The average ROI you’ll see from a deck or a concrete patio is 70%, so from a value-add perspective, they’re about the same. However, decks are around double the price of a concrete patio, they require significantly more maintenance, and they have a lifespan of 10 to 15 years, about half of what you’d see from a concrete patio. As such, a concrete patio is a better option in terms of up-front cost, long-term maintenance, and ROI.