According to the gothic style of the time, the plan of the church is a Latin cross, with little outriggers. The nave measures 55 meters long, 12 wide, 20 cruise ship, plus 30 high. It is divided into four sections with their vaults, opening between the pillars individual chapels on either side, some starters, and a functional semidecorativo attempt.
The pillars are covered by life-size sculptures, supported by brackets and filigree covered by canopies, concerning saints or biblical characters not easily identifiable. Nerves or Gothic vaults palms do not cross diagonally but transversely, which accuses German influence. Appliques and rosettes tops the joints of the nerves, with a central shield and many signs of yokes and bundles of arrows and initials crowned Kings, like a starry sky in question.
A tracery topped with vegetable motif runs around the perimeter of the ship, dividing the canvas into two sides and underlining, between borders, a Spanish inscription in Gothic characters, from right to left, which reads:
“ESTE MONESTERIO E IGLIA MANDARON HASER LOS MUY ESCLARESCIDOS PRINCIPES E SEÑORES DO HERNANDO E DOÑA YSABEL REY E REYNA DE CASTILLA DE LEON DE ARAGON DE CECILIA LOS CUALES SEÑORES POR BIENAVENTURADO MATRIMONIO SE IUTARO LOS DICHOS REYNOS SEYENDO EL DICHO SEÑOR Y SEÑORA Y SEÑOR NATURAL DE ARAGON Y CECILIA Y SEYENDO LA DICHA SEÑORA REYNA Y SEÑORA NATURAL DE LOS REYNOS DE CASTILLA Y DE LEON EL CUAL FUNDARON A GLIA DE NRO SEÑOR DIOS Y DE LA BIENAVENTURADA MADRE SUYA NUESTRA SEÑORA LA VIRGEN MARIA Y POR ESPECIAL DEVOCION QUE TUVIERON”.