The first two days of interior work in a newly handed-over flat are often spent breaking things. A builder-fitted kitchen platform sits where the new layout needs a tall unit; sockets land exactly where the wardrobe will stand; a bathroom has been tiled in a colour the family will replace within a year; the AC points face the wrong wall. None of it is a defect. It is simply what happens when finishes are installed before anyone has designed the interior that will sit on top of them.
That scene sums up the real difference between the two ways of buying a flat. An under-construction flat offers a window in which the interior can shape the services and finishes — at the price of waiting, and of trusting a possession date. A ready-to-move flat can be measured, inspected and moved into sooner, but its builder finishes and points are fixed, and some of them will be undone. This comparison looks only at the interior side of that decision: what changes in cost, what changes in time, and how to use the strengths of each. Prices use the Surat 2BHK bands used across this site, before GST.
Side by side: twelve criteria
| Criterion | Under-construction flat | Ready-to-move flat (new, with completion/occupancy certificate) |
|---|---|---|
| When interior design can start | Months before possession, from the builder's drawings | Immediately after purchase |
| When site work can start | Usually only after possession | After registration and handover |
| Typical move-in | Possession + about 12–16 weeks (2BHK mid-range) | About 15–20 weeks from purchase, including design |
| Certainty of dates | Depends on the builder's possession date | Known; the flat exists |
| Changing points and services | Possible before plaster, if the builder accepts requests | Only by cutting walls, then repairing and repainting |
| Rework of builder finishes | Little, if changes are agreed in time | Some: platforms, sockets, tiles chosen by the builder |
| What can be inspected before buying | Sample flat and drawings only | The actual flat, its light, views and finishes |
| GST on the price | 1 % (affordable) or 5 %, without input tax credit | No GST on a sale after the completion certificate |
| Carrying costs while waiting | Rent plus loan interest or pre-EMI until move-in | Shorter overlap of rent and EMI |
| Defect liability under RERA | Five years from possession for structural and workmanship defects | Five years from possession, so check the date it started |
| Site conditions | Many flats doing interiors at once; lifts and hours restricted | Usually calmer in an occupied building |
| Best for | Buyers with time and a clear idea of the interior | Buyers with a deadline, or who want to see before paying |
Two lines in that table deserve emphasis. First, the "change window" in an under-construction flat is real only if the builder accepts change requests and records them; many do for electrical and plumbing points, fewer for tiles and kitchen platforms, and some charge for any change. Second, RERA gives buyers of new flats from registered projects a five-year period from possession in which the promoter must rectify structural and workmanship defects, but alterations made by the owner can complicate claims, so major interior changes are best photographed and recorded before and after.
What it costs: a Surat 2BHK three ways
The interior itself costs the same whichever way the flat was bought: in this site's Surat bands, a 1,000 sq ft 2BHK is about ₹8–11 lakh budget, ₹13–18 lakh mid-range and ₹23 lakh or more luxury, before GST. What differs is the layer of work around it. The table uses the mid-range band and adds only the extra lines each route typically needs.
| Line (1,000 sq ft 2BHK, mid-range, before GST) | Under-construction (changes agreed in time) | New ready-to-move | Older resale, full renovation |
|---|---|---|---|
| Interior scope: kitchen, wardrobes, TV unit, ceilings, lighting, paint | ₹13–18 lakh | ₹13–18 lakh | ₹13–18 lakh |
| Old kitchen platform removal | — | ₹0.10–0.25 lakh | Included in renovation layer |
| About 10 extra concealed points after plaster (₹900–1,800 each) | — | ₹0.09–0.18 lakh | Included in renovation layer |
| Renovation layer: strip-out, rewiring, two bathrooms, floor, repairs | — | — | ₹5.5–12 lakh |
| Total before GST and appliances (band includes basic loose furniture) | ₹13–18 lakh | ₹13.19–18.43 lakh | ₹18.5–30 lakh |
| Watch for | Builder's charges for change requests, if any | Rework grows if bathrooms are re-tiled | Contingency of about 10–15 % of the renovation layer |
On a new flat the rework is small — about ₹19,000–43,000 in the example — but it grows quickly if the family also replaces builder bathroom tiles or the kitchen dado, which brings tile removal and waterproofing into the job. On an older resale flat the renovation layer is the big number: rewiring, bathrooms and floors are often due anyway, and this site's renovation guide puts that layer at about ₹550–1,200 per sq ft for a 2BHK. The figures exclude the GST on the flat itself, which is a separate decision covered in the site's guide to GST 2.0 on building materials.
Timing: from booking to moving in
For a ready-to-move flat the clock is simple: about three to four weeks of design, then about 12–16 weeks on site for a mid-range 2BHK, so roughly 15–20 weeks — three and a half to four and a half months — from purchase to moving in; add four to eight weeks for an older resale flat that needs renovation first. For an under-construction flat the design can be finished long before possession, but site work normally starts only when the keys are handed over, so the move-in date is the possession date plus the same 12–16 weeks. The advantage is that the family loses no time after possession; the risk is that the possession date moves.
| Stage | Under-construction flat | Ready-to-move flat |
|---|---|---|
| Design and drawings | Before possession, from builder's plans; re-measure at handover | 3–4 weeks after purchase, from site measurement |
| Change requests to builder | Electrical and plumbing points, platform, tile choice — before plaster | Not applicable |
| Snag inspection | At possession, before interior work covers anything | Before purchase or at handover |
| Site work, mid-range 2BHK | 12–16 weeks after possession | 12–16 weeks after design approval |
| Extra for renovation | — | 4–8 weeks for an older resale flat |
| Overlap of rent and EMI | From loan disbursements until move-in | Usually 3.5–4.5 months; longer for resale |
Where under-construction wins
- Services placed for the design: sockets, switches, AC, geyser and washing-machine points go exactly where the drawings need them, without cutting finished walls.
- Less waste: a family that plans to fit a modular kitchen can ask the builder to skip or simplify the platform and dado, where the builder allows it.
- Time to design properly: decisions on kitchen layout, wardrobes and lighting can be made over months instead of weeks.
- Payments spread out: the interior budget can be built up while construction-linked payments continue.
- A clean start: the interior begins on fresh walls with no old wiring, plumbing or damp to discover.
The condition attached to all of these is paperwork. Change requests should be made in writing, on a marked drawing, with the builder's acknowledgement and any charge stated. At possession, a full snag inspection should be done before a single interior item is installed, because once wardrobes and ceilings cover walls and services, it becomes hard to prove whether a crack or a leak is the builder's or the interior contractor's.
Where ready-to-move wins
- Certainty: the flat exists, so the move-in date depends only on the interior programme.
- What you see is what you get: daylight, views, ceiling heights, beams and actual room sizes can be measured before buying.
- Shorter overlap of rent and home-loan payments, which often outweighs the small cost of rework.
- No GST on the purchase price when the sale happens after the completion certificate.
- Accurate measurement from day one, so factory-made carpentry can be ordered without re-measuring later.
To keep rework small in a new ready-to-move flat, decide early what will stay: if the builder's bathroom tiles and fittings are acceptable, design around them and spend on the rooms that change most. Mark every new point on the electrical drawing so that the electrician cuts walls once, before putty and paint, rather than in stages.
Resale flats: ready, but rarely ready for interiors
An older resale flat is "ready" only in the legal sense. After ten or fifteen years, wiring may lack proper earthing and RCCB protection, bathrooms may need new waterproofing, and floors may be hollow or uneven. These are best handled before the interior, in one programme, which is why this site's renovation guide adds a layer of about ₹5.5–12 lakh to a 2BHK and four to eight weeks to the timeline. The trade-off can still be good: resale flats are often in established areas, with known neighbours and a society that is already running. Electrical and structural concerns should be checked by a licensed electrician and, where there are cracks or corroded steel, a structural engineer before the purchase is final.
Frequently asked questions
When should I start interior design for an under-construction flat?
Start the design about six months before the expected possession, so that electrical and plumbing change requests can reach the builder before plastering in your flat. Site work normally starts after possession and takes about 12–16 weeks for a mid-range 2BHK.
Is interior work cheaper in an under-construction flat?
The interior scope costs the same; what an under-construction flat saves is rework — moved sockets, removed platforms, replaced tiles — which is about ₹19,000–43,000 in a typical new 2BHK and much more if bathrooms are re-tiled. Any charges the builder levies for change requests should be set against that saving.
How long after buying a ready-to-move flat can we move in with interiors?
About 15–20 weeks, or three and a half to four and a half months, for a mid-range 2BHK: three to four weeks of design and about 12–16 weeks on site. An older resale flat that needs rewiring, bathrooms or floors usually adds four to eight weeks.
Sources & standards
- Real Estate (Regulation and Development) Act, 2016 — project registration, disclosure, and the promoter's obligation to rectify structural and workmanship defects for five years from possession (Section 14)
- GST Council, 33rd and 34th meetings (February–March 2019) — residential flats at 1 % (affordable) and 5 % (other) without input tax credit; CGST Act, 2017, Schedule III — sale of a building after completion certificate
- National Building Code of India 2016, Part 8 (building services — electrical and plumbing installations)
- IS 732 — Code of practice for electrical wiring installations
- Gujarat Real Estate Regulatory Authority (GujRERA) — project registration and disclosure portal
- Price ranges: indicative October 2026 estimates — Surat 2BHK bands, renovation layer and rework rates as used across this site — confirm locally before budgeting. Legal points are general information, not legal advice
