Staircase

Spiral staircases can be safe for all ages if designed with features such as code-compliant handrails, non-slip treads, and proper spacing. However, narrow treads and steep angles may pose challenges and a safety hazard for young children or those with mobility issues, so consider safety upgrades or alternative designs if needed.

No, high labor costs and the project's complexity make concrete stairs more expensive than steel or wood stairs. Wood steps cost between $100 and $200 per step, including labor and materials, while concrete steps are about triple, at between $200 and $600 per step. Building codes may also have stricter requirements for concrete steps, as they’re considered permanent, so you might also pay more for permits.

The best finish for wood stairs is polyurethane, specifically a high-durability option like oil-based or water-based polyurethane. Oil-based polyurethane provides a rich, amber tone that enhances the wood’s natural grain and is highly durable, making it ideal for areas with heavy foot traffic. Water-based polyurethane, while slightly less durable, dries faster, has less odor, and maintains the wood’s natural color without yellowing over time.

The best sandpaper to use for finishing stairs will actually be two separate grades—a coarse sandpaper and a fine one. You should use the coarse grit as a first pass and to do the heavy lifting. Most projects use 80- to 120-grit for the bulk sanding. After you’ve done the first layer, you’ll want to be more careful—using 150- to 220-grit is recommended at this stage. It also is a good idea to sand with the sander first then do the fine work by hand, feeling the wood as you work.