A Bangalore wall is not a Jaipur wall.

Pick any Indian city or enter your 6-digit PIN code. The tool returns advisory envelope bands for that city — window sizes per direction, external wall thickness, roof slope, overhang depths, courtyard guidance — drawn from ECBC 2017, Eco Niwas Samhita 2018, and supplementary climate tables. The same data set is read into GrehYug's Vastu reports, and informs door/window placement in the floor-plan generator. Wall, roof, and foundation specifications require an architect or RCC consultant.

Live demo · Same plot, different city

DelhiDelhi

Composite

Hot summers, cold winters, monsoon — the climate where classical Vastu was calibrated.

Köppen: Cwa / Cfa
NBC zone: Composite
Summer: 35-48°C
Winter: 2-15°C
Rainfall: 500-1200 mm
Humidity: 20-90% (seasonal)

Operable windows matter more than fixed ones. The same opening that bleeds heat in January welcomes it back in July.

Envelope · drawn from engine

External wall: 9"
Roof slope: 10°
Plinth: 1.5 ft
Ceiling: 10 ft
Overhang S: 3 ft
Overhang W: 2.5 ft
Cross-vent: high
Courtyard: essential
Glazing: clear
Wall R: 2.3

North

5.0ft

low sill

East

4.5ft

mid sill

South

3.0ft

high sill

West

2.5ft

high sill

Don't see your city? Try its 6-digit PIN code · 80+ cities mapped · ECBC 2017 · Eco Niwas Samhita 2018

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How to read this: the numbers are advisory bands — what a typical residential envelope in this zone should approximate. They are not structural design values, they are not a substitute for licensed architectural or engineering review, and they should not be relied on for any sanctioned drawing. For a sanctioned construction drawing the architect / RCC consultant on your project signs off on the final envelope. For a generated GrehYug plan, the climate data informs door and window placement; wall thickness, roof slope, and foundation specifications remain the licensed professional's call.

Seven climate zones, drawn from the engine

India's residential climate is split into five canonical zones in ECBC 2017 (Hot-Dry, Warm-Humid, Composite, Temperate, Cold). GrehYug recognises two more — Tropical (Kerala) and Extreme Rainfall (NE India) — because they need different envelopes that the canonical five do not cover.

Hot-Dry

Jaipur · Jodhpur · Ahmedabad

Warm-Humid

Mumbai · Chennai · Kolkata

Composite

Delhi · Lucknow · Patna

Temperate

Bengaluru · Pune · Hyderabad

Cold

Srinagar · Shimla · Leh

Tropical

Kochi · Trivandrum

Extreme Rainfall

Cherrapunji · Shillong

Climate adaptation tool

DelhiDelhi

Seven climate zones, drawn from the engine