Claremont Fan Court school in Portsmouth Road, Esher, is opening for free during Heritage Open Day weekend.
The 18th century Palladian mansion will open jointly with the surrounding park and landscaped garden.
The house, which was built by Clive of India and later became a palace, opens this Saturday from 11am to 5pm, while the garden, with its lake, island pavilion, grotto and turf amphitheatre, opens from 10am to 6pm.
For more details, log onto claremont-surrey.co.uk
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