Nadal, who set Spain on their way to victory in the tie by winning the first point on Friday, returned to the clay court at the Palau Sant Jordi to help himself to a 6-3, 6-4 win over Jan Hajek.
Ferrer, whose exhausting five-set victory over Radek Stepanek had given Spain their second point, rounded things off with a more straightforward 6-4, 6-2 win against Lukas Dlouhy, finishing off with a huge smash to the delight of the crowd.
Spain made certain of their fourth Davis Cup win, and second in succession, when they moved into a 3-0 lead after Saturday's doubles. It was a satisfying weekend in every way for the hosts, with Nadal showing he has recovered form and fitness at the end of a trying season and Ferrer's heroic win over Stepanek providing epic drama with a happy ending for the huge crowd.
“Last year was so disappointing for me personally not to be there but for the team it was better, considering the way they played without me,” Nadal told a news conference.
“This year it was just a pleasure to be back on the team, and playing the final at home is always special.
“So I just want to say thanks very much to the team for making it through the quarters and semis. They gave me the opportunity to be here.”