My husband is a very experienced Architect, who has just started his own practise Lewis Stroud Architects with a partner. As they have only recently launched, they are able to provide a very competitive package.
Lewis Stroud Architects are based in Balham and offer a full service from concept design and planning through to appointing a contractor and over seeing the project on site. They are RIBA chartered and have a portfolio of well designed, completed projects which they can share with you, if interested.
Below are their details:
Lewis Stroud Architects
Hope that helps!