A self-climbing elevator arrangement for use during the construction of a building, characterized in that the self-climbing elevator arrangement comprises a self-climbing installation platform comprising - two decks (110, 120) being positioned upon each other, each deck (110, 120) comprising guide means for supporting the deck (110, 120) movably on guide rails, and locking means for locking and unlocking the deck (110, 120) to the guide rails and/or to guide rail fixing means (26, 27), - lifting means for moving the two decks (110, 120) along the guide rails in relation to each other, - at least one power source providing power to the lifting means, the self-climbing installation platform being arranged to climb stepwise along the guide rails by alternatingly locking and unlocking the lower deck and the upper deck to the guide rails and/or to the guide rail fixing means (26, 27) with the respective locking means and thereafter raising the unlocked deck (110, 120) with the lifting means, a machine room deck positioned below the self-climbing installation platform and provided with machinery for an elevator car, the machine room deck comprising guide means for supporting the machine room deck movably on the guide rails, and locking means for locking and unlocking the machine room deck to the guide rails and /or to the guide rail fixing means (26, 27), the machine room deck being suspended from the self-climbing installation platform, and an elevator car positioned below the machine room deck, the elevator car comprising guide means for supporting the elevator car movably on the guide rails, and locking means for locking the elevator car to the guide rails and/or to the guide rail fixing means (26, 27), the elevator car being suspended with hoisting ropes from a traction sheave positioned on the machinery deck. a self-climbing installation platform comprising - two decks (110, 120) being positioned upon each other, each deck (110, 120) comprising guide means for supporting the deck (110, 120) movably on guide rails, and locking means for locking and unlocking the deck (110, 120) to the guide rails and/or to guide rail fixing means (26, 27), - lifting means for moving the two decks (110, 120) along the guide rails in relation to each other, - at least one power source providing power to the lifting means, the self-climbing installation platform being arranged to climb stepwise along the guide rails by alternatingly locking and unlocking the lower deck and the upper deck to the guide rails and/or to the guide rail fixing means (26, 27) with the respective locking means and thereafter raising the unlocked deck (110, 120) with the lifting means, - two decks (110, 120) being positioned upon each other, each deck (110, 120) comprising guide means for supporting the deck (110, 120) movably on guide rails, and locking means for locking and unlocking the deck (110, 120) to the guide rails and/or to guide rail fixing means (26, 27), - lifting means for moving the two decks (110, 120) along the guide rails in relation to each other, - at least one power source providing power to the lifting means, the self-climbing installation platform being arranged to climb stepwise along the guide rails by alternatingly locking and unlocking the lower deck and the upper deck to the guide rails and/or to the guide rail fixing means (26, 27) with the respective locking means and thereafter raising the unlocked deck (110, 120) with the lifting means, a machine room deck positioned below the self-climbing installation platform and provided with machinery for an elevator car, the machine room deck comprising guide means for supporting the machine room deck movably on the guide rails, and locking means for locking and unlocking the machine room deck to the guide rails and /or to the guide rail fixing means (26, 27), the machine room deck being suspended from the self-climbing installation platform, and an elevator car positioned below the machine room deck, the elevator car comprising guide means for supporting the elevator car movably on the guide rails, and locking means for locking the elevator car to the guide rails and/or to the guide rail fixing means (26, 27), the elevator car being suspended with hoisting ropes from a traction sheave positioned on the machinery deck.