An elevator system comprising: an elevator car configured to move through an elevator shaft; a first guide beam extending vertically through the elevator shaft, the first guide beam comprising a first surface of the first guide beam and a second surface of the first guide beam opposite the first surface of the first guide beam, wherein the first guide beam comprises a first section (111a-1) of the first guide beam; a second guide beam extending vertically through the elevator shaft, the second guide beam (1 1 1b) comprising a first surface of the second guide beam and a second surface of the second guide beam opposite the first surface of the second guide beam, wherein the second guide beam (11 1b) comprises a first section (111b-1) of the second guide beam (11 1b); a beam climber system configured to move the elevator car through the elevator shaft, the beam climber system comprising: a first wheel in contact with the first surface of the first guide beam; and a first electric motor configured to rotate the first wheel; and a beam climber assembly pod operably attached to the beam climber system, wherein the beam climber system is configured to move the beam climber assembly pod to a location in the elevator shaft where the second section (111a-2) of the first guide beam may be attached to the first section (11 1a-1) of the first guide beam; characterised in that: the beam climber system comprises a second wheel in contact with the second surface of the first guide beam, and a third wheel in contact with the first surface of the second guide beam; the beam climber assembly pod further comprises a first lifting system configured to releasably attach to a second section (11 1a-2) of the first guide beam; and the beam climber assembly pod further comprises a second lifting system configured to releasably attach to a second section (111b-2) of the second guide beam. an elevator car configured to move through an elevator shaft; a first guide beam extending vertically through the elevator shaft, the first guide beam comprising a first surface of the first guide beam and a second surface of the first guide beam opposite the first surface of the first guide beam, wherein the first guide beam comprises a first section (111a-1) of the first guide beam; a second guide beam extending vertically through the elevator shaft, the second guide beam (1 1 1b) comprising a first surface of the second guide beam and a second surface of the second guide beam opposite the first surface of the second guide beam, wherein the second guide beam (11 1b) comprises a first section (111b-1) of the second guide beam (11 1b); a beam climber system configured to move the elevator car through the elevator shaft, the beam climber system comprising: a first wheel in contact with the first surface of the first guide beam; and a first electric motor configured to rotate the first wheel; and a beam climber assembly pod operably attached to the beam climber system, wherein the beam climber system is configured to move the beam climber assembly pod to a location in the elevator shaft where the second section (111a-2) of the first guide beam may be attached to the first section (11 1a-1) of the first guide beam; a first wheel in contact with the first surface of the first guide beam; and a first electric motor configured to rotate the first wheel; and a beam climber assembly pod operably attached to the beam climber system, wherein the beam climber system is configured to move the beam climber assembly pod to a location in the elevator shaft where the second section (111a-2) of the first guide beam may be attached to the first section (11 1a-1) of the first guide beam; the beam climber system comprises a second wheel in contact with the second surface of the first guide beam, and a third wheel in contact with the first surface of the second guide beam; the beam climber assembly pod further comprises a first lifting system configured to releasably attach to a second section (11 1a-2) of the first guide beam; and the beam climber assembly pod further comprises a second lifting system configured to releasably attach to a second section (111b-2) of the second guide beam.