Clear height, FM2 floors, dock ratios, fire NOC and compliance: the measurable gap between warehouse grades and how to compare them on cost per pallet position.
Grade-A in the Indian market means, in practice: 10 to 12 metres of clear height under the eaves, permitting 5 or more racking levels; FM2-class superflat floors carrying 5 to 6 tonnes per square metre, which VNA racking and articulated MHE require; a dock-to-floor-area ratio adequate for the use, with levellers and canopies; ESFR or equivalent sprinkler coverage and hydrant systems; 40 metre plus yard depths for trailer manoeuvring; and 24x7 operability with proper lighting, security and worker amenities.
Grade-B is everything that misses several of these: 6 to 8 metre heights, ordinary tremix floors of uncertain load rating, few or no docks, packaged or absent fire systems, tight yards and patchy compliance.
The arithmetic that matters is cost per pallet position per month, not rent per square foot. Height drives it directly: the same footprint at 11 metres against 7 metres carries roughly half as much again in pallet positions, which routinely outweighs the rent gap between grades. Floor quality decides whether you can run VNA and how fast; dock ratios decide vehicle turnaround time, which is a labour and detention cost; sprinklered buildings price lower on insurance and are increasingly mandatory for e-commerce and 3PL client audits.
Run the comparison honestly and Grade-B's discount survives only for low-stack, low-velocity uses: bulky slow-moving inventory, open yard adjuncts, or short-term overflow.
A warehouse is a building with approvals: a DTCP or CMDA-sanctioned plan for warehousing use, a fire NOC matched to the stored commodity class, TNPCB consents where operations require them, and structural stability certification. A large share of older Grade-B stock around Chennai's fringes stands on agricultural-classified land or beyond its sanctioned plan, which exposes the occupier to disruption it did not price.
Client audits increasingly check this layer: global 3PL contracts and listed-company supply chains cannot sit in unapproved sheds, whatever the rent saving.
Treat the brochure grade as a claim and verify: measure clear height at the lowest obstruction, not the ridge; sight the floor's flatness and load certification; count docks against your vehicle profile; check the fire NOC's commodity class against your inventory; and read the land and approval records underneath, title, conversion, sanctioned plan, the same way we read any parcel in the 30-point verification.
The half-day of verification costs less than one month of the rent difference it usually explains.
Grade-A delivers 10-12m clear height, FM2 superflat floors at 5-6t/m², adequate docks, sprinkler systems, deep yards and full statutory compliance. Grade-B misses several of these, trading capability and compliance for lower rent.
For racked, high-velocity operations, almost always: the extra pallet positions from height alone usually outweigh the rent gap on a per-pallet basis, before counting MHE speed, insurance and compliance benefits.
Measure clear height at the lowest point, sight floor load and flatness certificates, check the fire NOC's commodity class, count usable docks, and verify the land's title, conversion status and sanctioned plan at source.