As michael reported in post #43, planning permission has already been granted for this development. You can see the full plans for the two houses on Lewisham's website. The reference is DC/10/74983/X.

According to the conditions

so unfortunately, any vehicles will be parked on the street. Government policy on Transport can be found in PPG13, but cycling is to be encouraged for journeys of less than 5km. The policy that required councils to limit the number of parking spaces allowed in new residential developments and set high parking charges to encourage the use of alternative modes of transport was deleted in January. Further guidance is given in the Manual for Streets, but this is non-binding.