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Notes in italics from Hampshire and the Isle of Wight by Nikolaus Pevsner and David Lloyd (1967)
Yale University Press, New Haven and London.

A minster is recorded at Waltham in early Saxon times. Nothing visible in the present structure is earlier than c.1200 ...  Many alterations from the C15 to the C17; heavy restorations in the C19 ... The chancel is in the main C15, with three-light E window and two-light side windows. The church is most interesting for its post-Reformation alterations, the SW tower rebuilt in 1584-9, the N aisle in 1637, and the S aisle in 1652. All are in Gothic Survival, the aisle side windows square-headed and cusped and the E windows of the aisles straightforward Perp with upper tracery. ... the tower is low and quite massive, with square-headed Tudor-type windows. From the stairway rises a tall and prominent rounded turret, decorated with quatrefoils and large crosses; it is of C17 origin but must have been altered since. The W end of the nave was rebuilt in 1849. The external texture of the church is varied; much of the old walling is in flint, but most of that of the C17 is in ashlar, except at the E end of the S aisle, where there is chequered stone and flint work. 

The N arcade of c.1200 has slightly double-chamfered arches with round responds, but the piers are C19 renewals. ... The present S arcade is a copy of the N by Sir Thomas Jackson (in 1894-7), whose is also the chancel arch. ... if the proportions of the wide nave represent those of Norman times, it must have been a building of fairly considerable scale.

Pulpit. A splendid piece, given by Bishop Andrewes in 1626. Panels with strapwork arches under steep little pediments. Elaborate C19 sounding board, matching well.