David Clarke, LDS Pacific area projects manager, said high walls at the Masterton chapel were at the centre of the upgrade project that would take the building beyond district authority compliance requirements.
Mr Clarke said the chapel was built in 1962 with members of the then congregation helping with construction, as was the tradition at the time, and additions were made to the building in the 1980s.
"It's always been in the pipeline to seismically upgrade the meeting house. We've done that throughout New Zealand and we've been able to attend to most of our higher priority meeting houses."
Mr Clarke said the Masterton chapel had been identified as a priority, especially given its location in the Greater Wellington region and Wairarapa, which are earthquake prone.
Mr Clarke said the church organisation had been scrutinising its buildings, chapels and churches throughout New Zealand and assessing recompliance needs according to the age and scale of the structures.
The church organisation had not been ordered to upgrade the Masterton chapel, Mr Clarke said, but rather the church were "choosing to do this".
"We've planned this over a number of years just to make sure our facilities are safe moving into the future."
Mr Clarke said the Featherston chapel had been built "quite a bit later" than its counterpart in Masterton and had been earthquake-strengthened in the late 1990s.
"We want to ensure our buildings are safe enough for most conditions because, as with Christchurch, you just don't know what level of intensity an earthquake could have," he said.
"We just want to make sure the saints that attend there remain safe in all our buildings."