My brother-in-law has a painting company. You could call him for a quote. He has done a lot of work on some big houses in Chelsea, Knightsbridge and Fulham, but would be just as happy in Balham.You could give him a call:-
Alexander Lethbridge - 07766 545040
For joinery, you could have a look at my husband John Lethbridge's website
www.lethbridgelines.com or give him a call to discuss any details.
I know I am PR-ing my family but both of them have done work for a lot of my friends, family and colleagues who have all been thrilled with the service and quality of work from both Lethbridge brothers so am confident they could do a good job.