Grendon Hall is a Grade II listed building situated in the Parish of Grendon Underwood. A former residence, then during the Second World War was Station 53a of the Special Operations Executive (SOE), it is now the main administration building for Springhill Prison.

Dated 1882 on a beam in chapel. Built by Rev. Randolphe Pigott for his brother Sir Digby Pigott.

Red brick with painted stone quoins, bonded window surrounds and copings, and moulded brick eaves. Tiled roofs, brick chimneys. Jacobethan E-plan building with shallow projecting outer bays and porch.

Outer bays have shaped gables and 2-storey canted bay windows with painted stone mullions and transoms, embattled ornament to parapets, and diaper panels between storeys. 3-light attic windows with hoodmoulds and shields above.

Intermediate bays each have 2 cross windows to each storey and 2-light attic dormers with stone crosses in ogee gables.

Central porch has 3-light transomed window with hoodmould to first floor, 2-light attic window, and door in 4-centred stone arch with hoodmould. Stone shields above door and in shaped gable of porch.

Chapel to rear of left wing has battlemented porch with 2-centred arch. Altered chapel has open truss roof, inserted floor, and coffin hatch with re-used C16 wooden surround.

Interior: ribbed plaster ceilings; fireplaces with 4-centred stone arches, that to dining room with wooden Gothic surround; Ground floor doors are in Renaissance style with carved ornament; first floor doors in moulded architraves with panelled and fluted friezes and dentil cornices; fine C17 staircase, re-sited, with turned balusters, moulded handrail and urn finials.