Construction
Construction began with setting foundations for the tomb. An area of roughly three acres was excavated and filled with dirt to reduce seepage from the river. The entire site was levelled to a fixed height about 50 m above the riverbank.
View from the Agra Fort.
In the tomb area, wells were then dug down to the point that water was encountered. These wells were later filled with stone and rubble, forming the basis for the footings of the tomb. An additional well was built to same depth nearby to provide a visual method to track water level changes over time.
Instead of lashed bamboo, the typical scaffolding method, workmen constructed a colossal brick scaffold that mirrored the inner and outer surfaces of the tomb. The scaffold was so enormous that foremen estimated it would take years to dismantle. According to legend, Shah Jahan decreed that anyone could keep bricks taken from the scaffold, and it was dismantled by peasants overnight.
A fifteen-kilometer tamped-earth ramp was built to transport marble and materials from Agra to the construction site. According to contemporary accounts teams of twenty or thirty oxen strained to pull the blocks on specially constructed wagons.
To raise the blocks into position required an elaborate post-and-beam pulley system. Teams of mules and oxen provided the lifting power.
The order of construction was
The plinth
The tomb
The four minarets
The mosque and jawab
The gateway
The plinth and tomb took roughly 12 years to complete. The remaining parts of the complex took an additional 10 years. (Since the complex was built in stages, contemporary historical accounts list different "completion dates"; discrepancies between so-called completion dates are probably the result of differing opinions about the definition of "completion". For example, the mausoleum itself was essentially complete by 1643, but work continued on the rest of the complex.)