The short answer
Interior work is quoted per room, per square foot or as a turnkey package, and the joinery quantity drives most of the cost.
Quotes usually combine a design fee with an execution estimate, priced by area, by room or as a turnkey package. Modular kitchens, wardrobes and false ceilings dominate the budget, so quantities matter more than finishes.
Ask for a room-by-room breakdown with material specifications. A low package price usually means thinner carcasses, standard hardware and fewer electrical points — the three places savings are hidden.
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