Plans are a professional language, and most clients do not speak it
Architects read plans fluently and forget that almost nobody else does. A client can look at a floor plan, agree to it sincerely, and still be surprised by the room when they stand in it — because a plan tells you where things are and says almost nothing about how a space feels.
That gap is where late changes come from. Not from indecision, but from the first moment the client genuinely understands what was agreed.
What a walkthrough is really for
Standing inside the model before construction moves that moment of understanding forward by months. People notice things they could never have found on a drawing: that a corridor feels tight, that a window looks straight at a neighbour's wall, that the kitchen counter has its back to the room, that a door swing makes a corner unusable.
Every one of those is trivial to fix in a model. Two of them are expensive to fix after the structure is up, and one of them you simply live with for thirty years.
The economics of a change, by stage
The cost of a change rises steeply and predictably. During design it is a drawing revision. After working drawings it is a coordination exercise across structure and services. After the slab is cast it is demolition and rework. After finishes it is demolition, rework and the finishes you have already paid for.
Anything that moves decisions earlier in that sequence is worth considerably more than it appears to cost, which is why immersive visualisation is part of the NavoGruha process rather than an optional extra.
What it does not do
It is worth being straight about the limits. A walkthrough is a model, not the building: material and light are approximations, and it will not tell you how the house sounds or how warm it is in May. It does not replace a site visit, and it does not substitute for drawings — a contractor still builds from the working set.
What it does is let you make the decisions that are genuinely yours to make — about space, about light, about how you will live in the plan — at the point where changing your mind is still cheap.