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The church consists of nave with north and south aisles, chancel, west tower and south porch. The overall appearance is of a complete Perpendicular style church but some fabric remains from the 12th century.

The exterior is largely 15th century work, the most notable earlier feature being the late 12th century Norman doorway in the north wall of the chancel. The elegant west tower, unlike many neighbours, is of a single period, with a 3-light west window and 2-light bell-chamber openings. The 15th century south porch is noteworthy for the set of 6 crocketted pinnacles and the ribbed vault of its roof. Inside it also contains a small image niche over the remains of a stoup. The north aisle has been reinforced with plain coursed rubble buttresses at some period.

The nave comprises two 4-bay arcades of the 14th century (north) and 15th century (south), with a 15th century clerestory. The chancel arch is flanked by stone angels with a third at the apex. A similar angel surmounts the tower arch. The nave roof timbers are 15th century with carved bosses. There is a fine 15th century timber chancel screen, but other interior furnishings are 19th and 20th century. There are interesting paintings - 'cake-rings' or 'cheeses' - in the ringing chamber of the tower, celebrating weddings and dated between 1769 and 1865.

The church is Listed Grade I. For more information about the church see the Southwell & Nottingham Church History Project Link

Listed buildings and structures are officially designated as being of special architectural, historical or cultural significance. There are over half a million listed structures in the United Kingdom, covered by around 375,000 listings.
Listed status is more commonly associated with buildings or groups of buildings, however it can cover many other structures, including bridges, headstones, steps, ponds, monuments, walls, phone boxes, wrecks, parks, and heritage sites, and in more recent times a road crossing (Abbey Road) and graffiti art (Banksy 'Spy-booth') have been included.

In England and Wales there are three main listing designations;
Grade I (2.5%) - exceptional interest, sometimes considered to be internationally important.
Grade II* (5.5%) - particularly important buildings of more than special interest.
Grade II (92%) - nationally important and of special interest.

There are also locally listed structures (at the discretion of local authorities) using A, B and C designations.

In Scotland three classifications are also used but the criteria are different. There are around 47,500 Listed buildings.
Category A (8%)- generally equivalent to Grade I and II* in England and Wales
Category B (51%)- this appears generally to cover the ground of Grade II, recognising national importance.
Category C (41%)- buildings of local importance, probably with some overlap with English Grade II.

In Northern Ireland the criteria are similar to Scotland, but the classifications are:
Grade A (2.3%)
Grade B+ (4.7%)
Grade B (93%)

Read more at Wikipedia Link