How to Build a Spiral Staircase
If you have limited space and want to create access to a loft or upper floor, a spiral staircase is an extremely efficient solution. Spiral staircases can be purchased prebuilt and installed in a home, or they can be custom created out from iron or wood.
Before you begin installing a spiral staircase, you should first apply for a building permit. In many cases, if you attempt to purchase a kit without a permit, it will not be shipped to you until you can show a valid building permit.
Next you will need to select a set of stairs. You can look at building magazines for ideas and order catalogs from manufacturers or can you find an online source if you want to buy a kit. You can also go to a local wrought-iron artisan to have a custom-designed spiral staircase created specifically for your interior space.
Step 1 - Determine Location
Decide where to install the stairs. Start by cutting a hole in the floor of the second level, or by choosing a spot along the edge of the loft. Do not choose a location that is next to a wall. Doing so will make the installation difficult.
Step 2 - Allow for Headroom
Set the stairs in place so that they have a headroom of at least 6.5-feet.
Step 3 - Measure for Clearance
Measure the height and diameter of the staircase. Include a clearance of at least 2-inches from the walls and the floor for the handrail.
Step 4 - Measure for Tread Height
Measure the outside of the steps to calculate the tread height.
Step 5 - Cut Treads
Cut the treads for the staircase all at the same time using a pattern that you have made. The treats should be no wider than 4-inches. You will be gluing the risers together, so vary the wood grain as you glue the pieces together after you have sanded the edges smooth.
Step 6 - Cut Center
Use a band saw to make the circular cut for the inner center circular cut.
Step 7 - Mount Center Pole
Mount the center pole to the floor. Make sure that it is level and securely attached to the floor so that it does not move back and forth.
Step 8 - Weld Steps to Pole
Weld the top and bottom steps to the pole. Install the rest of the steps and attach them to the pole.
Step 10 - Install Railing
Purchase a railing that is specifically designed for a spiral staircase. It is extremely difficult to build one unless you have special skills as a carpenter or other artisan experienced. Install the railing as directed.