How does the bathroom renovation cost calculator work?

It treats a renovation differently from a new build. You set the bathroom size, wall height, city tier and quality tier, then toggle each of 12 items to replace or keep. It works out floor area, wall area and a waterproofing wet band, applies indicative India 2026 per-item rates scaled by your quality and city, adds roughly 8 percent for site prep, sundries and contractor margin, and totals only the items you replace.

What inputs and values should I enter?

Enter the room length and width in feet, or switch to direct floor area, plus wall height. A typical Indian bathroom is around 35 to 45 sq ft with about 9 ft walls. Pick your city tier, from metro down to town, and a quality tier from budget to luxury. Then mark each item as replace or keep. Keeping working fittings, tiles or plumbing is where most of the savings shown come from.

If I retile, do I have to redo waterproofing and demolition?

Usually yes. Lifting old tiles breaks the existing waterproofing membrane, so retiling floors or walls almost always means fresh demolition, debris removal and re-waterproofing before new tiles go down. Skipping this is the most common cause of later leaks and seepage into rooms below. The figures here are indicative for planning only, so confirm scope and quotes with your contractor and follow good waterproofing practice per NBC 2016.

Renovation Cost

Bathroom Renovation Cost Calculator

Renovating an existing bathroom is not the same as a new build — it carries demolition & debris removal, and you can keep what still works. Set your size, quality and city, then toggle each item to replace or keep and see the cost — and the ₹ you save. Indicative India 2026.

Your bathroom

Length (ft)

Width (ft)

Wall height (ft)

City tier

Quality tier

Replace or keep each item

Demolition & debris removal

Replace · ₹10,022

Re-waterproofing

Replace · ₹11,790

New floor tiles

Replace · ₹4,900

New wall tiles

Replace · ₹28,080

New WC / toilet

Replace · ₹9,000

New basin & vanity

Replace · ₹12,000

New CP fittings & shower

Replace · ₹14,000

New geyser

Replace · ₹12,000

Plumbing rework

Replace · ₹14,800

Electrical rework

Replace · ₹8,400

False ceiling

Replace · ₹4,200

Painting

Replace · ₹2,324

Rates are indicative for India 2026 and include material + labour, plus 8% for site prep, sundries & contractor margin. Retiling forces re-waterproofing and demolition, so keep those checked together. Always confirm quotes locally.

Estimated renovation cost

₹0

replacing 0 of 12 items · about ₹4,058/sq ft

Full-gut reference

₹1,42,037

replace everything

You save by keeping

₹0

0 items kept

Demolition & debris

₹10,022

break-out + haulage

Site prep & sundries

₹10,521

8% of works

Cost by item you are replacing (before the 8% site margin). Indicative — confirm quotes locally.

Plan the renovation scope

Get DesignAI to sanity-check this budget and suggest where to spend or save.

Go deeper

Bathroom cost calculator Waterproofing calculator Bathroom tile calculator

Estimates are indicative for India 2026 and vary with fixture brands, tile grade, contractor rates and site conditions (chasing walls, slab breaking, chute access). Demolition, debris haulage and re-waterproofing are the line items most often forgotten when comparing a renovation to a fresh build — always get an itemised quote and confirm scope with your contractor before you commit.

Frequently asked questions

How does the bathroom renovation cost calculator work?: It treats a renovation differently from a new build. You set the bathroom size, wall height, city tier and quality tier, then toggle each of 12 items to replace or keep. It works out floor area, wall area and a waterproofing wet band, applies indicative India 2026 per-item rates scaled by your quality and city, adds roughly 8 percent for site prep, sundries and contractor margin, and totals only the items you replace.
What inputs and values should I enter?: Enter the room length and width in feet, or switch to direct floor area, plus wall height. A typical Indian bathroom is around 35 to 45 sq ft with about 9 ft walls. Pick your city tier, from metro down to town, and a quality tier from budget to luxury. Then mark each item as replace or keep. Keeping working fittings, tiles or plumbing is where most of the savings shown come from.
If I retile, do I have to redo waterproofing and demolition?: Usually yes. Lifting old tiles breaks the existing waterproofing membrane, so retiling floors or walls almost always means fresh demolition, debris removal and re-waterproofing before new tiles go down. Skipping this is the most common cause of later leaks and seepage into rooms below. The figures here are indicative for planning only, so confirm scope and quotes with your contractor and follow good waterproofing practice per NBC 2016.

Related Guides — Deep-dive reading

Bathroom Renovation Cost in India (2026): Line-Item ₹ Breakdown & Budget

What it actually costs to renovate an existing bathroom in India — demolition and debris, re-waterproofing, plumbing and electrical upgrades, new tiles and fixtures, and labour — with partial-refresh vs full-gut ranges, budget/standard/luxury figures, a worked sample budget and where renovation costs more than new-build.

Bathrooms

Bathroom Renovation Checklist (India): Survey-to-Handover Working Document

A copy-and-use bathroom renovation checklist for Indian sites — what to survey before you touch a tile, what to demolish and what to keep, society NOC and logistics, the correct rebuild sequence, and a phase-by-phase timeline you can lift straight into your project file.

Bathrooms

Bathroom Renovation Guide India: Process, Cost & Mistakes (2026)

How to renovate an existing bathroom in an Indian home, step by step — assessment, demolition, waterproofing, plumbing and electrical upgrades, tiling and fixtures — with a realistic line-item rupee budget, a stage-by-stage timeline, and the mistakes that ruin the flat below.

Bathrooms

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