R.B.I. Custom Window
Robert Bowden Inc Celebrating 25 Years

Why Factory Built Stairs versus site built stairs?


  • Every stair built same way.


  • Precise, engineered computer generated rise/run calculation and cut for any site condition.
  • Treads, risers, and stringers are nailed and screwed together as one unit, instead of pieced together at site.
  • Treads and risers are encased by precision routed LVL stringers instead of nailed to 3 individually cut (and slightly different) 2x10 stringers underneath.
  • Site stringers must be reinforced with "sistered" 2x4 to regain strength lost by deep tread and riser cuts. Frequently "oversawn", further reducing strength.


  • Factory stair stringers serve as skirt board because treads and risers are routed into it. Site stairs require costly 1x12 skirt to trim out ends -- difficult to cut precisely and gaps are common.


  • Equal to or lower than site built. Can be a lot lower, depending on framing and trim carpenter's skill level.

Stair Quote Info

Open Stairs


Why RBI factory built stairs versus other factory built stairs?

  • Primed LVL stringers instead of unimproved lumber.
  • Solid yellow pine treads instead of particleboard or MDE.
  • Smooth plywood instead of rough OSB for risers.
  • Stainable oak treads are protected with hardboard tread covers.
  • Oak cove mould under stainable oak treads.
  • Engineered PVC wedges instead of hand cut wood wedges to insure tight, squeak proof joints.
  • Glue blocks on all riser and tread joints.
  • Every stair is accurately measured and custom built.
  • Faster lead times.

Examples of Shop Built Stairs

Straight Box
"L" Stair
Scissor Stair
Stairs with no platform or turn. May have wall on both sides, one side or variation of the two.
Stairs with one platform or turn. May have wall on both sides, one side or a variation of the two.
When the lower level stairs share a common wall with the upper level stairs.
.Straight Stair
.L Stair
Scissor Stair.


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