High Quality Content by WIKIPEDIA articles! Beltwood House is a Grade II listed building within the Dulwich Wood Conservation Area in south London, England. The large three-storey mansion has fifty rooms and stands in about 3.05 acres of wooded grounds, with gatekeeper`s lodge, mews courtyard cottages, stables and a stable apartment, a tennis court and a croquet lawn. The site has been subject to a blanket tree preservation order since 1985.