Measuring Floor-to-Floor Height for a Steel Staircase

What floor-to-floor height actually means

Floor-to-floor height, often called the total rise, is the vertical distance between the finished surface of one floor and the finished surface of the floor above. The key word is finished. Concrete slabs are rarely the final surface, so screed, tiles, wood or stone must be accounted for before the number is final.

On renovation projects, check whether the measurement reflects the current floor or the planned finish. A difference of a few centimeters changes every riser in the staircase.

How to measure on site

Measure at several points, not only at one corner. Floors are seldom perfectly level, and the difference between points is information you need.

• Measure from the finished floor at the bottom to the finished floor at the top, at both sides of the opening.
• Record each reading and note any slope or uneven areas.
• Mark the position of the opening and the landing to be used.
• Photograph the area with a measuring tape visible for reference.

Use the average and the highest and lowest readings to plan tolerances.

Calculating steps and riser height

Once the total rise is known, the number of risers is set by dividing it by a comfortable riser height. Steps must be even in height, so every riser must be identical within a tight tolerance. The resulting tread depth is then checked against the horizontal space available.

Exact comfort values and safety limits are defined in the Israeli railing and staircase standard SI 1142 and related requirements, which the engineer checks for your project. Do not finalize riser numbers from a rough estimate.

Allowing for landings, turns and structure

A straight run is only one option. Quarter-turn or half-turn stairs with intermediate landings change how the total rise is split, and each landing adds a fixed height step. The structure itself, whether stringers, a central spine or cantilevered treads, must be coordinated with the slab and wall conditions at the top and bottom.

Confirm the fixing points early. Anchoring into a concrete slab needs known edge distances and enough thickness at each connection.

From measurement to production

After measuring, the team prepares a drawing and written specification that show the number of steps, riser and tread dimensions, the stringer profile, and the fixing details. The client approves the drawing before anything is cut. Steel elements are then manufactured in the factory to these exact dimensions.

Finishing, such as hot-dip galvanizing or powder coating, is applied after fabrication. Plan for this step, because it adds time and can slightly affect fit if the coating thickness is not considered.

Installation and final checks

Installation is best done once the floor finishes are fully completed at both levels, or with a clear agreement on the final surface height. Installing before the final screed or tile layer is one of the most common causes of a staircase that ends up too high or too low.

• Verify the top and bottom finished levels before fixing.
• Check that all steps are level and identical in height.
• Confirm handrail and railing heights after installation.

Frequently asked questions

Should I measure before or after the floor is finished?

Measure the finished floor level wherever possible, or confirm the planned final thickness of screed and tiles. Measuring the bare slab alone usually leads to a staircase that does not fit the final floor.

Why does the number of steps matter so much?

Every step must have the same riser height, so the total rise is divided into a set number of equal parts. Changing the number of steps changes the tread depth and the overall footprint of the staircase.

Can the staircase be adjusted after production?

Limited adjustment is possible for some details, but steel elements are cut and fabricated to fixed dimensions. Accurate measurement before production avoids costly corrections.

Do I need an engineer for the calculation?

Yes, for the structural design and the verification of riser, tread and railing values against the applicable standard. The engineer confirms the exact figures for your project.

Common mistakes to avoid

Measuring only once at one point and ignoring the screed or tile thickness are the two errors that most often lead to a staircase that does not match the floor. Always measure several points on the finished surface.

Our recommendation

Record the floor-to-floor height at three points, agree on the final finished levels in writing with the contractor, and approve the drawing before production begins.

Summary

Correct floor-to-floor measurement on the finished surface is the foundation of a well-fitting steel staircase, and it should be confirmed before any steel is cut.

Related guides

• How Ceiling Clearance Affects Steel Staircase Design
• Site Survey Checklist Before Ordering Steel Stairs
• Planning Staircase Landings in Steel Structures
• Staircase Rise and Run: How Steel Stairs Are Dimensioned
• Steel Staircase Design Drawings: What to Expect
• Straight vs Spiral Steel Stairs: Process and Fit
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