www.maskells.com Welcome to Maskells, London & International Estate Agents. Based in Chelsea since 1965. As the local experts in Houses and Flats for sale or for rent in Chelsea, Knightsbridge, Belgravia, Kensington & South Kensington, Notting Hill, Holland Park & Battersea. Maskells Estate Agents gives you privileged access to an unrivalled depth of property expertise, experience and local knowledge.