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Exterior residential entrance steps are usually about 7 inches high, so a porch with more than 2 steps would be about 21 inches high. Most building codes require a 36 inch high guard (railing) if the change in level is 30 inches or more.
In this example, an architecturally correct railing height for this house is 27.25 inches or lower. This places the rail even with the window sill. Therefore, this hand rail must be 8.75 inches higher to meet the building code requirement of 36 inches from the porch floor (36-27.25=8.75).our railing height is now up to the 36â³ code. Well â almost to code. Step 3) To correct this, a 1 x 1.5 inch strip of wood should be attached to the support blocks. You will then have a space of 3 inches on one side and 2.75â³ on the other side. Building Code: Your rail height must be 36 inches or more.