How to Plan a Home Interior Project — Greenbox Design Studio
Planning

How to Plan a Home Interior Project

The order you do things in decides how much the project costs. Here is the sequence that works.

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Updated 19 Sep 2026
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The sequence

  1. Write the briefHow many people, how you cook, what you store, who works from home. Two pages is enough, and it prevents months of drift.
  2. Set a realistic budgetUse a per-sq-ft band, then add 10% contingency and 18% GST. Know your ceiling before you meet designers.
  3. Shortlist and appointMeet three studios. Ask each for a line-item BOQ, not a lump sum — the quality of the BOQ tells you more than the portfolio.
  4. Layouts, then 3DResolve the plan first. 3D views make a resolved plan beautiful; they cannot rescue an unresolved one.
  5. Sign the contractBOQ, timeline, payment milestones, exclusions, variation procedure, warranty. All six, in writing.
  6. BuildWeekly site reviews. Decisions get made in the review, not ad hoc by whoever is on site.
  7. Snag and hand overWalk the home with a written list. Close it before the final payment.
Design and build under one accountable roof — Greenbox Design Studio
Planning

Design and build under one accountable roof

The three decisions that cost the most if delayed

What late decisions actually cost
DecisionDecide byCost of deciding late
AppliancesBefore joinery fabricationCut-outs remade; ₹15k–₹60k plus a week
Electrical point positionsBefore tiling and plasteringChasing new walls; ₹20k–₹1 L plus two weeks
Flooring changeBefore any joineryJoinery lifted and refitted; can exceed ₹2 L

Every decision is cheap on paper, expensive on site, and ruinous after handover.

Greenbox principal designer
Greenbox residential interior project in Mumbai — 1
Greenbox residential interior project in Mumbai — 2
Greenbox residential interior project in Mumbai — 3
Greenbox residential interior project in Mumbai — 4
Greenbox residential interior project in Mumbai — 5

Selected work by Greenbox Design Studio. Tap any image to enlarge.

Frequently asked questions

How long does planning take before site work starts?+

Typically three to five weeks: one week for brief and budget, two to three for layouts and 3D iterations, and one for BOQ finalisation and contract. Rushing this phase is the most reliable way to increase the final cost.

Should I fix the budget before or after meeting designers?+

Before. Arrive with a ceiling figure and share it. A designer who knows your budget will design to it; one who does not will produce something you have to value-engineer afterwards, which wastes everyone's time and usually the design's coherence.

How much contingency should I keep?+

Ten per cent of project value. It gets consumed by site discoveries — old wiring, uneven walls, damp — and by the small upgrades every client makes once they see the space taking shape.

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