A stair step jig assembly for smoothing treads on concrete steps includes a jig that is elongated to a predetermined length to extend along a full length of a tread on a concrete step for smoothing the tread before the concrete has cured. A riser adjustment is hingedly coupled to the jig and the riser adjustment unit abuts a concrete form that is positioned against the riser of the step adjacent to the tread upon which the jig is positioned. A leg is hingedly coupled to the jig and the leg slidably engages the riser adjustment such that each of the leg, the riser adjustment and the jig forms a triangle. The leg has engages a top of the riser of the step adjacent to tread upon which the jig is positioned for keeping the jig at a fixed angle on the tread.

A stair step jig assembly for smoothing treads on concrete steps includes a jig that is elongated to a predetermined length to extend along a full length of a tread on a concrete step for smoothing the tread before the concrete has cured. A riser adjustment is hingedly coupled to the jig and the riser adjustment unit abuts a concrete form that is positioned against the riser of the step adjacent to the tread upon which the jig is positioned. A leg is hingedly coupled to the jig and the leg slidably engages the riser adjustment such that each of the leg, the riser adjustment and the jig forms a triangle. The leg has engages a top of the riser of the step adjacent to tread upon which the jig is positioned for keeping the jig at a fixed angle on the tread.

A handrail installation device, including a first arm removably connected to at least a portion of a stair tread, a second arm pivotally disposed at a first end on at least a portion of the first arm to rotate from retracted in parallel with the first arm in a first position to at least partially extended away from the first arm in a second position, and rotate from extended away from the first arm in the second position to retracted in parallel with the first arm in the first position, and a bubble level disposed on at least a portion of the second arm to identify a level surface based on a position of at least one of the first arm and the second arm.

A handrail installation device, including a first arm removably connected to at least a portion of a stair tread, a second arm pivotally disposed at a first end on at least a portion of the first arm to rotate from retracted in parallel with the first arm in a first position to at least partially extended away from the first arm in a second position, and rotate from extended away from the first arm in the second position to retracted in parallel with the first arm in the first position, and a bubble level disposed on at least a portion of the second arm to identify a level surface based on a position of at least one of the first arm and the second arm.

An angle adjustable tread holding bracket comprising a first bracket member having a first triangular shaped body member including a first opening; and a second bracket member rotationally attached to the first bracket member via a pin hinge member, wherein the second bracket member includes a second triangular shaped body member having a U-shaped slot allowing the first triangular shaped body member of the first bracket member to be inserted into the U-shaped slot enabling the angle of the tread holding bracket to be adjusted, wherein the second triangular shaped body member includes an arcuate groove and a second opening.

An angle adjustable tread holding bracket comprising a first bracket member having a first triangular shaped body member including a first opening; and a second bracket member rotationally attached to the first bracket member via a pin hinge member, wherein the second bracket member includes a second triangular shaped body member having a U-shaped slot allowing the first triangular shaped body member of the first bracket member to be inserted into the U-shaped slot enabling the angle of the tread holding bracket to be adjusted, wherein the second triangular shaped body member includes an arcuate groove and a second opening.

A square gauge apparatus configured for being selectively and removably mounted on a leg of a carpenter's square has a ledge having a ledge first surface and an opposite ledge second surface, the ledge first and second surfaces being parallel and offset, a first abutment extending from the ledge and having a first abutment front surface that is perpendicular to the ledge first surface, a second abutment extending from the ledge opposite the first abutment and having a second abutment front surface that is perpendicular to the ledge second surface and parallel to and coplanar with the first abutment front surface, and a slot formed adjacent to the ledge between the first and second abutments, the slot having a slot end surface that is parallel to and coplanar with the first and second abutment front surfaces.

A square gauge apparatus configured for being selectively and removably mounted on a leg of a carpenter's square has a ledge having a ledge first surface and an opposite ledge second surface, the ledge first and second surfaces being parallel and offset, a first abutment extending from the ledge and having a first abutment front surface that is perpendicular to the ledge first surface, a second abutment extending from the ledge opposite the first abutment and having a second abutment front surface that is perpendicular to the ledge second surface and parallel to and coplanar with the first abutment front surface, and a slot formed adjacent to the ledge between the first and second abutments, the slot having a slot end surface that is parallel to and coplanar with the first and second abutment front surfaces.

In a method and system of designing a stair lift rail assembly to be mounted on a three-dimensional structure, a light beam including an optical pattern on at least part of the structure is projected from a reference location relative to the structure. Light from the structure is detected. Image data of the structure are generated based on the detected light. The image data are processed to generate a set of map data of the structure, the set of map data representing a three-dimensional map of the structure. Spatial path of the stair lift rail and locations of support interfaces for the stair lift rail assembly in the three-dimensional map are determined. Design of the stair lift rail assembly is generated based on the spatial path of the stair lift rail and the locations of the support interfaces for the stair lift rail assembly.

Systems and methods for constructing staircases are described herein. The systems include a stringer hanger bracket for coupling a stair stringer of the staircase to an upper floor, two or more tread support structures and a jig. Each tread support structure is configured to couple a tread to the stair stringer. The jig is configured to determine a mounting position of each of the tread support structures on the stair stringer, determine a mounting position of each of the tread support structures on the stair stringer and/or determine a length of the stair stringer.