States members have voted through the law that will reinstate senators in time for the next election.
The legislation enabling the return of the island-wide vote was passed by 28 votes to 17.
Politicians narrowly agreed back in March to bring back senators, reversing their 2021 abolition.
Every electoral district will lose a deputy, to make way for nine senators.
Town Constable Simon Crowcroft tried to get that number reduced to seven, with two extra St Helier deputies.
However, although he won the vote 24 - 21, he narrowly missed the 25 votes required for the idea to be adopted.
Another suggestion - for a separate election day for senators - was also defeated.
Deputy Montfort Tadier thought failed senatorial candidates should get the chance to run for deputy or constable.
That vote was lost 18 -28.
Deputy Hilary Jeune failed (20-22) in her attempt to require senatorial candidates to have a nominee from at least one person from each electoral district.
Jersey's politicians voted to adopt the Committee of Constables' idea to prevent a by-election being called if a senatorial seat becomes vacant close to a general election.
The timeframe will increase from six months to nine months.
Revised Strive hotel plans given the go ahead
South Hill skatepark gets green light
Health and care charities worth £137m to Jersey
'Not finding guilt is a verdict' says Human Rights Group on retrial law
Date set for new vape tax to take effect
Youth Assembly backs vape ban, but narrowly rejects social media ban
Public Health Jersey issues advice following UK meningitis outbreak
Ports of Jersey to takeover running of harbour café
