
The alteration of the interior architecture is vital to satisfy new demands in regards not just to functional needs but to the desired life style of the home owner. This will affect directly the interior design proposal. Before floor plan layout.
When there is the need to change/improve/enhance the look or/and feel of a room not many people realise that they are going to affect how the interior architecture is going to be understood, experienced and more importantly felt.
There is a very strong link between interior architecture and interior design.
Interior design cannot exist without interior architecture; it does not matter if the latter is good, bad, mediocre, sublime, etc. The truth is that interior architecture exists at the moment that the interiors of a building (the space or spaces that are contained/defined by the building), are being created to respond to a particular use.
How those spaces connect, are lit, vary in their proportions, shape, etc in residential projects can be decided either by the home owner or by professionals like property developers, architects and interior designers.
Every one of these individuals has different motivations for defining the character and functionality of those rooms.
At the heart of interior design is the need to understand those rooms and propose a scheme that makes them feel and look in a particular way usually defined by the user.
I would say that the best interior design projects are those that have listened to and understood what the interior architecture is saying.
Here are some of the key points that need to be considered.
Floor plan layout
The way the rooms are organised will play a very important part in how to make them work not just individually but as a whole when deciding on their interior design.
Lighting: natural and artificial
The interior designer needs to have a clear understanding about how the different rooms are being lit by natural means, proposing adjustments to the intensity of it if necessary and proposing ways of including artificial light, either for specific tasks or features.
Proportion rooms
Evaluating carefully the proportions of the rooms will be essential for developing the concept, for choosing the right furniture or soft furniture.
Special features
Sometimes the interior architecture, like that of those homes built during Victorian, Georgian or Edwardian times have very strong details like fire places, cornices etc, that usually become a great starting point for the development of a contemporary concept.
Being able to analyse carefully these elements will certainly help to develop the right solution for a given space, a solution that will be affected as well by the people living in that home.

On this floor plan layout the interior architecture has been proposed which has been fully considered when working on the furniture layout. In this way architecture, interior architecture and interior design, all of them, are aiming to consistency and to complement each other as if they never were independent entities. After floor plan layout.
Hearing what the interior architecture is saying will provide to the interior design process the right clues, either for assimilating or challenging the nature of the space.