The interior of the house was designed partially by Capability Brown, with plasterwork by G. Vassalli, and partially by Robert Adam, with plasterwork by Joseph Rose, Jr. It has a central spine corridor.
A stone staircase, with iron balusters, is at the east end.

The entrance hall is on the north side of the building, and has four fluted Doric columns, along with moulded doorcases.
To the east of the entrance hall is the dining room, which has a plaster ceiling and cornice, while to the west is a billiard room, featuring fielded panelling, a plaster cornice, and a rococo fireplace.
The three rooms were probably decorated around 1758–1759 by Capability Brown.
The dining room was vibrantly repainted by the Hare Krishnas in the 1970s-80s.

The central room on the south side is a saloon, probably by Brown and Vassalli.
It has an elaborate ceiling, with three panels, deep coving, and a cornice, along with two Ionic fireplaces, and Palladian doorcases.
King George III was entertained by George Coventry, the 6th Earl, in the house's Saloon.
A drawing room is to the west of the saloon, and features rococo plasterwork and a marble fireplace.

To the east of the saloon is the Tapestry Room.
This was designed in 1763–1771, based on a design by Robert Adam, and contained tapestries and furniture covers possibly designed by François Boucher and Maurice Jacques, and made by Manufacture Nationale des Gobelins.
Around 1902 the ninth Earl sold the tapestries and seating to a Parisian dealer.
The Samuel H. Kress Foundation purchased the ceiling, floor, mantlepiece, chair rails, doors and door surrounds in 1949; they were donated to the Metropolitan Museum of Art, New York, in 1958.
In 1959, the Kress Foundation also helped the Metropolitan Museum acquire the chair and sofa frames, which they recovered using the original tapestry seats.
A copy of the ceiling was installed in place of the original.
As of 2016, the room is displayed as it would have looked after the tapestries had been sold, with a jug and ewer on display as the only original decoration of the room that remains in it.
The adjacent library room is used to explain what happened to the tapestry room; the former library was designed by Adam, and was dismantled except for the marble fireplace.

At the west side of the building is a Long Gallery which was designed by Robert Adam and installed between 1761 and 1766.
It is the best preserved of the original interior (little of the rest has survived in situ).
It has an octagonal panelled ceiling, and plaster reliefs of griffins.
A half-hexagonal bay faces the garden.
The room also contains a marble caryatid fireplace designed by J Wilton.
As of 2016, modern sculptures are displayed in empty niches along the Long Gallery.
The interior of the house was designed partially by Capability Brown, with plasterwork by G. Vassalli, and partially by Robert Adam, with plasterwork by Joseph Rose, Jr. It has a central spine corridor. A stone staircase, with iron balusters, is at the east end.
The entrance hall is on the north side of the building, and has four fluted Doric columns, along with moulded doorcases. To the east of the entrance hall is the dining room, which has a plaster ceiling and cornice, while to the west is a billiard room, featuring fielded panelling, a plaster cornice, and a rococo fireplace. The three rooms were probably decorated around 1758–1759 by Capability Brown. The dining room was vibrantly repainted by the Hare Krishnas in the 1970s-80s.
The central room on the south side is a saloon, probably by Brown and Vassalli. It has an elaborate ceiling, with three panels, deep coving, and a cornice, along with two Ionic fireplaces, and Palladian doorcases. King George III was entertained by George Coventry, the 6th Earl, in the house's Saloon. A drawing room is to the west of the saloon, and features rococo plasterwork and a marble fireplace.
To the east of the saloon is the Tapestry Room. This was designed in 1763–1771, based on a design by Robert Adam, and contained tapestries and furniture covers possibly designed by François Boucher and Maurice Jacques, and made by Manufacture Nationale des Gobelins. Around 1902 the ninth Earl sold the tapestries and seating to a Parisian dealer. The Samuel H. Kress Foundation purchased the ceiling, floor, mantlepiece, chair rails, doors and door surrounds in 1949; they were donated to the Metropolitan Museum of Art, New York, in 1958. In 1959, the Kress Foundation also helped the Metropolitan Museum acquire the chair and sofa frames, which they recovered using the original tapestry seats. A copy of the ceiling was installed in place of the original. As of 2016, the room is displayed as it would have looked after the tapestries had been sold, with a jug and ewer on display as the only original decoration of the room that remains in it. The adjacent library room is used to explain what happened to the tapestry room; the former library was designed by Adam, and was dismantled except for the marble fireplace.
At the west side of the building is a Long Gallery which was designed by Robert Adam and installed between 1761 and 1766. It is the best preserved of the original interior (little of the rest has survived in situ). It has an octagonal panelled ceiling, and plaster reliefs of griffins. A half-hexagonal bay faces the garden. The room also contains a marble caryatid fireplace designed by J Wilton. As of 2016, modern sculptures are displayed in empty niches along the Long Gallery.
Croome Court