Window Replacement Cost in India (2026): Retrofit vs New-Frame, Room by Room

Replacing tired, leaking, or rattling windows is one of the highest-return upgrades an Indian home can make, but the bill swings wildly depending on one decision made on day one: do you retrofit into the existing opening, or cut a full new frame? That single choice can double the civil work. This is the dedicated cost deep-dive for replacing windows in an existing home. For costing windows in a new build from scratch, read our pillar, Home Window Cost in India — that guide budgets fresh openings; this one budgets swapping out what is already there.

All prices are indicative for June 2026 in rupees. Always confirm with itemised quotes from local fabricators, and remember every figure below carries 18 per cent GST on top of materials and labour.

Retrofit replacement versus full new-frame

The cheapest, fastest path is a retrofit (also called a like-for-like or insert replacement): you reuse the existing structural opening and lintel, pull the old frame, and seat the new one in the same hole. Less demolition, less plaster, less dust, often a one-day job per window.

A full new-frame replacement means cutting or enlarging the opening, casting or extending a lintel, and making good the wall, plaster, and finishes. You choose this when the old opening is the wrong size, the wall around it has failed, or you are deliberately going bigger (say, a small kitchen window to a wide slider).

The frame and glazing cost is identical either way; the gap is almost entirely civil work and finishing. On a sound opening, retrofitting can shave 15 to 30 per cent off the all-in cost of each window.

What replacement actually costs per window

Replacement prices track the same supply rates as new windows, because the window itself is the same product. The material pillar, Window Frame Materials Compared, explains why you would pick uPVC over aluminium or wood; here we focus on the rupees.

By glazing tier, a single replacement window runs roughly:

By frame material, supply rates per square foot of window are:

A worked single-window example

Take a standard 4ft by 4ft bedroom window, so 16 sqft of glazing, retrofitted in mid-tier uPVC DGU at ₹700/sqft:

• Frame and glazing: 16 sqft x ₹700 = ₹11,200
• Hardware (handles, multi-point lock, mosquito mesh): ₹1,500
• Installation and sealing: ₹1,200
• Removal and disposal of old window: ₹500
• Subtotal: ₹14,400
• Add 18 per cent GST: ₹2,592
• All-in: about ₹16,992 per window

The same window as a full new-frame (enlarging the opening) would add ₹4,000 to ₹8,000 in cutting, lintel, and plaster making-good, pushing it past ₹22,000.

The cost levers that move your quote

Six variables explain almost every difference between two quotes:

• Number and size of openings — the single biggest driver; more glazing area equals more rupees, linearly.
• Material and glass tier — single to DGU to Low-E/laminated each adds ₹/sqft; acoustic and toughened glass cost more.
• Floor level and access — upper floors (above the third) need scaffolding or even a crane, raising labour ₹800 to ₹2,200 per opening.
• Civil condition of old frames and walls — rotten timber, crumbling sills, or out-of-square openings turn a clean retrofit into a part new-frame job.
• City — metro labour and logistics cost more than tier-2 towns.
• Removal and disposal — every replacement carries this; new build does not. The hidden line items are unpacked in Hidden Costs of Window Installation in India.

Removal and disposal of old windows is the one line a new-build quote never has. Budget ₹300 to ₹800 per opening for prising out the old frame, carting away timber or scrap aluminium, and tidying the debris.

A room-by-room replacement budget

Here is a worked whole-home budget for a typical 1,200 sqft home with 20 openings (about 270 sqft of glazing), retrofitting in mid-tier uPVC and aluminium, ground and first floor, all figures before GST.

This lands squarely in the realistic band. A full-home replacement on a 1,200 sqft home spans ₹36,000 at the bare single-pane retrofit end to ₹4.5 lakh for premium glazing with new-frame civil work; most mid-tier uPVC and aluminium jobs settle between ₹1.2 lakh and ₹2.4 lakh in supply, with install, disposal, civil, and GST carrying the all-in figure higher as above.

To pull the number down: retrofit wherever the opening is sound, keep single-pane in low-priority rooms, batch all windows in one visit to share scaffolding and labour mobilisation, and resist enlarging openings unless the room genuinely needs it.

References

• uPVC windows price per sq ft 2026 (Building and Interiors): https://buildingandinteriors.com/upvc-windows-price-per-sq-ft-india-2026-cost-guide/
• uPVC windows price per sq ft (Weatherseal): https://weatherseal.com/upvc-windows/upvc-windows-price-per-sq-ft-in-india-latest-cost/
• Aluminium windows price and installation cost (Alcoi): https://alcoi.in/aluminium-windows-price-and-installation-cost/
• IS 1948 (aluminium doors, windows and ventilators, BIS): https://law.resource.org/pub/in/bis/S03/is.1948.1961.pdf