"interior details" is correct and can be used in written English.
You could use it in a sentence such as: "The interior details of the mansion were extraordinary."
Most interior details are original.
The elaborate interior details were simply covered up.
Interior details include hardwood floors and exposed-beam ceilings.
Interior details include oak floors, fluted columns, pilasters and stained glass.
Most original interior details are well preserved, including hardwood floors, molding and seven wood-burning fireplaces.
The interior details are original, including heart-pine floors, brick fireplaces and mantels, and molding.
Interior details include tumbled travertine and bamboo flooring, vaulted ceilings and custom audio systems.
INSIDE: Most of the interior details and architectural flourishes are original.
Most of the house's interior details, including built-in furnishings and maple floors, are original.
Many interior details — like molding, arched windows, built-in woodwork and plaster walls — were retained.
Moreover, many interior details, Scheeren had told me, remained under discussion.
