Wat Arun, one of the kingdom's most famous landmarks, known for the morning light reflecting off its porcelain-encrusted surfaces, will remain open to visitors during the overhaul, according to officials.
"We will not close it all. The repairs will start in some parts only," a senior monk at the temple, Phra Sri Suthi Wethee, told AFP.
"Tourists can still come. We haven't closed the big stupa yet."
Work on the central tower -- built in the first half of the 19th century -- will start in 2015, according to Tharapong Srisuchat, a senior official at the Ministry of Culture.
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Tharapong estimated that it will take about a year to renovate the Khmer-style central stupa.
The budget for the project, which will start this month, is 130 million baht (USD 4.2 million), he added.
"The maintenance cycle is usually 25-30 years but it's shortening because of increased pollution and more severe changes in the weather," Tharapong said.
He said the work at the temple -- which was last renovated in 1996 -- would include repairing cracks, removing mould and replacing damaged tiles.