Work has started on the bulletproof wall along the base of the structure in a bid to stop any potential terror attacks at the world’s most visited monument.
The security boost comes as France improves its security measures amid the country’s ongoing state of emergency.
And the work, which will see a bulletproof wall constructed around the gardens beneath the Paris monument, is set to take nine months and will cost £30 million.
In the past two years, there have been a string of jihadist attacks in the French capital, which has killed 200 people.
Last year there was a drop in visitors to the Eiffel Tower and officials are now trying to entice tourists back to the famous site.
The overhaul includes better security measures, new signage and more online ticket availability from 2018.
According to French media, construction began on the glass wall installation on Monday and construction has been planned to cause as little disruption as possible.
Earlier this year, Paris Deputy Mayor Jean-Francois Martins said: “Currently, the perimeter is protected by unsightly temporary installations, which take the form of high-grade metal grids and modular buildings. It is useful in terms of security, but it spoils the monument. ”
The Eiffel Tower, which has six to seven million visitors a year, already has a permanent police patrol.
Paris councillors voted in March to increase security at the monument because of the high terrorist threat.
Last month, a teenage psychiatric patient jumped the security barrier with a knife saying he wanted to attack a soldier.
Authorities have claimed the new wall will not disrupt visitors to the iconic tower.
Paris will host the Olympics in 2024, which will bring further security concerns to the city.
In total 300 million euros have been put aside to improve visitors’ experience of the UNESCO World Heritage site over the next 15 years, half of which is for maintenance.