In a statement, Mohammad Nizar said the judgment meanns that the law and constitution are the true winners.
Calling judge Abdul Aziz Abd Rahim a brave and courageous person, Mohammad Nizar said everyone would benefit by the judgment "because an independent judiciary is absolutely essential for the well-being of any country and its people".
"(And) we reiterate that the House should be dissolved as per the resolution as per the assembly under the tree on March 3," he said.
In an immediate reaction, opposition stalwart Lim Kit Siang commended the ruling.
"This is a great judgment. This is the first time the court has restored public confidence in the judiciary," he said.
PAS vice-president Husam Musa said he hoped the Perak sultan would now give his consent for new polls.
"It is not about whether we are confident of winning the state again or not but it is a matter of principle for us to go back to the voters to resolve the political impasse that has existed for the past three months," he told AFP.