To me the design of bespoke furniture for the interior of a house that is in the design phase can be one of two things.
1) The design of furniture that is can be easily made to fit the space with the efficiency of material, storage, function and space, using the most availible resources to the client. Or better still, designing the space for the furniture that standard furniture can be created/bought to fit the space with ease, rendering ir also suitable for the future change of furniture needs (as this will hopefully be before the time of change of the house - if it is well-thought-out design.)
2) The design of furniture to fit a space that has been put in place without the thought of furniture, even though it is a new design, thus meaning, if the space is to be adequately functional in use to the furniture, that it has to be bespoke designed and built in - making future replacement difficult as well as the product expensive and time consuming to all invloved.
In my opinion the furniture can be aethetically designed to match the interior and styels of the building in both these options, so why would one opt to carry out design in the second method?