How to Install a Spiral Staircase

A spiral staircase can be the focal point of any room and can serve a practical purpose.

Preparing for Installation

Spiral staircase kit manufacturers have made it easy to select a staircase style, order a kit and do-it-yourself. Improve any space with a spiral staircase by following these steps.

Measure the total floor-to-floor height. The floor-to-floor measurement is taken from the finished floor of the upper floor, to the bottom floor so that the landing is flush with the upper floor.

Count the number of risers. This number equals the number of treads plus the landing. For example, if you have 12 treads and a landing, the number of risers is 13.

Calculate the riser height. Divide the total floor-to-floor height measurement taken in Step 2 by the number of risers calculated in Step 3. The riser height is the distance from the top of one tread to the top of the next tread. This is the distance that is left between each tread.

Determine which corner of the wall opening to attach the landing to. Plumb down from that corner to the floor. This marks the position on the floor where the base of the center post is attached.

Position the baseplate on the floor of the marked area. Secure the plate to the floor with the provided kit hardware. Insert the pole into place. An additional person should hold the pole as the treads are added.

Installing the Staircase

Lower treads from the top of the center pole to the bottom one at a time. Distribute the weight of the treads evenly by alternating them one to the left and then one to the right. Repeat this process until all treads have been added.

Install the support for the newel post into place once all treads have been added.

Fasten the top landing into place in the well opening. Screw brackets into place to secure the landing. Make sure the landing is level.

Line up the treads. Make sure the rear of each tread overlaps the front of the tread directly above it by 1 to 3 inches.

Secure the treads into place by installing the vertical rods. Adjust treads so that riser height distance is equal between each tread. Use the riser height measurement calculated in Step 4.

Install the handrail from bottom to top. Screw the threaded couplers into place.

Install the landing handrail.

Set the newel post into place to complete the installation. Retighten all screws and bolts and make sure all parts are secure.

Things You Will Need

  • Spiral staircase kit
  • Ladder
  • Safety goggles
  • Tape measure
  • Steel ruler
  • Drill with bits
  • Screwdrivers
  • Plumb line
  • Level
  • Wrench
  • Hacksaw


  • Most spiral staircase kit manufacturers assist you with measurement details and other needs when you order the kit.
  • Kit contents and assembly vary based on manufacturer staircase designs.
  • Use a hacksaw to shorten the center pole or vertical rods if necessary.
  • Wear safety goggles during the installation.


  • Avoid damage to the treads during installation. Sharp tools easily damage the finish.