Flooring Standards in India: The Complete Code & IS Map (2026)

A floor is one of the few things in a home you walk on every single day for decades — and almost everything that decides whether it stays flat, stays safe, and stops you slipping is written down in a standard you have probably never read. Indian flooring is governed by a surprisingly complete web of codes: Bureau of Indian Standards (BIS) specifications, National Building Code (NBC) provisions, accessibility law, and international slip and abrasion tests that Indian manufacturers quote on their cartons. This guide is the master map. It tells you what each code governs, why it protects you, and exactly which spec to demand before you pay an advance.

If you remember one thing: a standard is not bureaucratic noise. It is the difference between a tile that survives twenty years of foot traffic and one that wears matte in two, between a bathroom you can stand in and one your parents fall in. Insisting on the right code on the quote is the cheapest insurance you will ever buy.

The master map: code to coverage to why it matters

Indian flooring standards fall into five families: ceramic and vitrified tile specs (the IS 15622 family), test-method standards (IS 13630), performance ratings that ride on top (PEI abrasion, slip R-ratings), natural-stone specs (the IS 1130 / 14223 / 3622 / 1124 family), and building-code obligations (NBC 2016 plus accessibility law). On top of all of them sits the BIS Quality Control Order, which turns "recommended" into "mandatory by law" for tiles.

How to read the hierarchy

These codes are not a flat list — they nest. A test-method standard (IS 13630) defines the measurement; a product standard (IS 15622) sets the pass thresholds and groups; a performance rating (PEI, R-rating) sits on top for the buyer; the QCO makes it all enforceable; and the building code (NBC) governs how the finished floor must behave in the room. The diagram below shows that stack.

IS 15622 and the water-absorption groups: the core tile code

IS 15622 is the single most important code for the tiles in most Indian homes. It adopts the international ISO 13006 system and sorts pressed tiles by how much water the body soaks up — which is a direct proxy for density, strength, frost and stain resistance. The lower the absorption, the harder and more impervious the tile.

The single most common mistake we see in finished flats is a BIII wall tile laid as a floor because it was cheap and looked the same in the showroom. Within a year it crazes, stains and wears. Always ask the dealer for the water-absorption group in writing. For a deeper walk-through see our companions on the IS 15622 tile standard explained and tile water-absorption groups.

Abrasion and scratch: PEI and MOHS

Water absorption tells you about the body of the tile; PEI tells you about the wear of the glaze. The PEI rating (ISO 10545-7) grades glazed tiles from 0 to V by how many cycles of abrasion the surface survives before visibly dulling.

• PEI 0 / I: walls and decorative use only.
• PEI II: light foot traffic, such as a bedroom with soft footwear.
• PEI III: normal homes — living rooms, kitchens, the workhorse home grade.
• PEI IV: heavy domestic plus light commercial — entrances, small shops.
• PEI V: heavy commercial — malls, stations, airports.

For home floors pick PEI III or higher; for retail or office floors specify IV-V. Note that full-body and double-charged vitrified tiles carry the abrasion deep through the body and are rated by abrasion volume loss (cubic millimetres) rather than PEI, which is why a good double-charged tile can outlast a glazed one even without a high PEI number. MOHS hardness (typically 5-7 for stone and tile) is a quick scratch gauge but is not a substitute for PEI. Our PEI rating guide breaks down the classes with examples.

Slip resistance: the code that prevents falls

Slip is where standards literally save lives, and it is the most under-specified property in Indian projects. Three systems are in use:

• DIN 51130 ramp test, results R9 to R13 (shod feet). R9 is dry indoor; R10 and above for wet floors; R11-R12 for outdoors, balconies and pool surrounds; R13 for industrial wet zones.
• DIN 51097, results A / B / C, for barefoot wet areas — the correct test for bathrooms and pool decks, which the shod ramp test does not represent.
• Wet-pendulum test, reported as a Pendulum Test Value (PTV), increasingly used for an objective single number.

NBC 2016 read with the RPwD 2021 Harmonised Guidelines requires anti-slip floors in wet and circulation areas, level and flush transitions, thresholds of 12 mm or less, and tactile flooring for the visually impaired. Specify at least R10 for bathrooms and kitchens and R11 for open balconies and terraces. The detail lives in our anti-slip flooring standards and NBC flooring requirements guides.

Natural stone: a separate code family

Marble, granite and sandstone do not fall under IS 15622 — they have their own specifications. IS 1130 covers marble blocks, slabs and tiles. IS 14223 covers polished building and granite stone. IS 3622 covers sandstone (the Jaisalmer, Jodhpur and Kota-belt stones). IS 1124 is the test for water absorption, specific gravity and porosity of stone — the natural-stone equivalent of the tile absorption test, and the number that tells you how stain-prone a marble will be. Because stone is a natural material with no ISI mark on the slab, these codes plus a daylight slab inspection are your only quality anchors. See natural stone standards for the full breakdown.

BIS, QCO and the ISI mark: what makes it mandatory

Recommendation becomes law through the Quality Control Order. Ceramic and vitrified tiles in India fall under a QCO that makes BIS certification — and the ISI mark — mandatory against IS 15622, IS 13753, IS 13755 and IS 13756. This applies to imports too: foreign tiles must carry valid BIS certification to be sold legally. Practically, this means you should refuse any tile carton without a genuine ISI mark and a traceable licence number. It is the one piece of paper that ties everything above into an enforceable promise. Our BIS marking guide shows how to read and verify the mark.

Fire and resilient floors

For most homes flooring is a low fire risk: stone and ceramic are non-combustible. The standards matter more for resilient floors — vinyl, carpet, laminate — in high-rises and commercial buildings, where NBC fire provisions call for low-smoke and controlled flame-spread materials. If you are specifying soft flooring for an apartment tower or office, check the NBC fire chapter and the product's flame-spread classification.

Putting it to work: a buyer's checklist

Before you pay, your quote or spec sheet should name, at minimum: the IS 15622 water-absorption group (BIa or BIb for floors), the PEI class (III+ for homes), the slip rating (R10+ wet, R11+ outdoor), the ISI mark and licence number, and for stone the relevant IS code plus a written slab-inspection note. If a vendor cannot supply these, that is your answer. To turn the codes into numbers for your own floor, use our tile water-absorption classifier, PEI grade selector and anti-slip rating selector.

Frequently asked questions

Is the ISI mark really mandatory for tiles in India?

Yes. Ceramic and vitrified tiles fall under a BIS Quality Control Order, which makes certification to IS 15622 and the related standards compulsory, including for imported tiles. A genuine ISI mark with a traceable licence number is your proof that the tile was tested. Treat any unmarked tile as unverified and avoid it for main floors.

What water-absorption group should I choose for floors?

For floors choose Group BIa (fully vitrified or porcelain, water absorption 0.5% or less) or BIb (vitrified, up to 3%). These are dense, strong and stain resistant. Groups BIIb and BIII are wall tiles — never use them as flooring. Always get the group confirmed in writing on the quote rather than relying on the showroom name.

Do natural stones have an ISI mark like tiles?

No. Marble, granite and sandstone are natural materials and the slab itself carries no ISI mark. They are governed by separate IS specifications — IS 1130 for marble, IS 14223 for granite, IS 3622 for sandstone, with IS 1124 as the water-absorption test. For stone, those codes plus a careful daylight slab inspection for veins, cracks and resin fills are your quality anchors.

What slip rating do I need for an Indian bathroom?

For a wet bathroom floor specify at least DIN 51130 R10 for shod feet, and consider DIN 51097 class B for barefoot wet areas. For open balconies, terraces and pool surrounds step up to R11 or R12. NBC 2016 with the RPwD 2021 guidelines also requires level, flush, anti-slip flooring in accessible buildings, with thresholds of 12 mm or less.

Does PEI rating apply to all tiles?

PEI applies only to glazed tiles, measuring glaze surface wear from class 0 to V. Full-body and double-charged vitrified tiles carry colour and pattern through the body and are rated by abrasion volume loss in cubic millimetres instead, which is why a good double-charged tile can outwear a glazed one. For homes pick PEI III or higher; for shops and offices pick IV or V.