Interior Painting Cost Calculator India

The standard number to ask for on a plastic emulsion quote

BIS's current standard for plastic emulsion paint — the washable, water-based interior wall paint category that dominates the economy-to-premium range this calculator prices — is IS 15489:2024, licensed under Scheme-I of the BIS (Conformity Assessment) Regulations, 2018, the same licensing framework used across BIS-regulated construction materials. The product manual requires a sample of each type and class covered by a licence to be tested before that class can be sold as certified, with a 4-litre sample the standard test quantity. "IS 15489" is the number to write into your painting contract if you want the ISI mark to mean something checkable — a can that says "emulsion" without a standard number attached is not making a certifiable claim.

This standard covers plastic emulsion specifically. Enamel, distemper and exterior-grade paints sit under separate IS standards not confirmed in this registry — do not assume IS 15489 covers a can labelled enamel or distemper.

That "each type and class" testing requirement in IS 15489 is also why an economy, standard and premium emulsion from the same manufacturer are not the same certified product with a different price tag on it — each grade is a distinct type or class, tested and licensed on its own. A contractor moving you from a standard-grade to a premium-grade can under the same licence umbrella is not automatically giving you a like-for-like upgrade unless that specific class was separately tested; ask which class number the can carries if the upsell matters to you.

GST on paint after the September 2025 reform

The reform runs under Notification No. 9/2025-Central Tax (Rate), dated 17 September 2025 — the Department of Consumer Affairs' own FAQ confirms it supersedes Notification No. 1/2017-Central Tax (Rate). The official PIB annexure listing every item whose rate actually changed cuts cement and room air conditioners from 28% to 18%, but a full-text search of that same annexure for "paint," "varnish" and "enamel" turns up only handicraft and hand/wood-frame "painting" items — not wall or emulsion paint. No cut is confirmed for interior emulsion paint from this reform. That matters for a household budgeting a repaint: do not discount your quote on the assumption of a GST saving that has not been verified anywhere in the official rate-change documentation.

A second Consumer Affairs FAQ on the same reform shows the reform was selective rather than a blanket construction-materials cut — most bricks kept their existing composition-scheme rate (6% without input tax credit, 12% with it), with only sand-lime bricks reduced, from 12% to 5%. Paint follows the same pattern as tiles and most bricks: unless a specific item appears in the official change list, its rate did not move in this reform.

Painting over a damp wall — the standard for the compound underneath

A wall that needs waterproofing before it can hold paint — typically an exterior-facing wall with visible dampness, or a wall below a leaking terrace — is not treated with paint at all but with a separate, BIS-certified product: an integral waterproofing compound under IS 2645:2003, which BIS licenses in two distinct types — powder and liquid form — each tested and certified separately, meaning a compound certified as "powder form" is not automatically certified as "liquid form" under the same licence. The compound must fully cure before the wall is painted over it.