There is a local hardware store on Great Peter Street and a Robert Dyas on Artillery Row. For paint, the nearest stockist is on Warwick Way:
Leyland Paints SDM
6-8 Warwick Way
London, SW1V 1RU
Tel: 020 7828 8695
Travis Perkins have branches on Pimlico Road, Chelsea and in Vauxhall:
Travis Perkins Trading Co.Ltd
61 Pimlico Rd
London, SW1W 8NF
Tel: 020 7730 6622
Travis Perkins Trading Co.Ltd
77 South Lambeth Rd
London, SW8 1RJ
Tel: 020 7582 3435