Inside, the restoration involved extensive, but meticulous reinstatement of existing work, but the main structure is substantially medieval, though possibly rebuilt.
Thus, the north arcade is the earliest (late C13).
Late C13 chancel arch with cylindrical shafts and stiff-leaf.
Chancel has simple sedile in south wall, and 2 stained glass window - the east window, by A. Gibbs, commemorates Charles Earl of Gainsborough, erected by his tenants in 1866.
The south window, by Clayton and Bell is a memorial to the daughter of Sir G. Noel, who died in 1816.
Exton Church is particularly remarkable for its monuments.
The earliest is a table tomb in the chancel: Nicholas Grene, late C14: Incised cross on marble slab on base with ogee-arched niches.
Also in the chancel, a wall monument by Nollekens: Baptist, 4th Earl and Elizabeth his wife, d. 1751 and 1771.
A reclining female figure with a cornucopia, on a sarcophagus backed by an obelisk with medallions and putti.
Chancel N. wall, memorial to James Harrington and his wife Lucy, 1591.
SK9211 : James Harrington, Memorial, Ss Peter & Paul church, Exton
A large standing monument with 2 kneeling figures at a pri-dieu in a double aedicule.
Wrought in various marbles and enriched with low-relief carving, strapwork etc. surmounted by obelisk, and arms.
Stylistically linked with this, the SK 9211 - 9311 EXTON EXTON PARK 5/56 Church of Saints Peter & Paul (Cont) 14.6.54 I S. transept memorial,to Robert Kelway, his daughter, wife and their 2 children.
This memorial is attributed by Pevsner to Nicholas Johnson and elsewhere (Rutland Magazine Vol. III) to Nicholas Stone.
Within, are the Viscount and his 4th wife in effigy and various lowreliefs, depicting his previous wives and 19 children, in Roman dress, completed at least by Grinling Gibbons.