What is the safest place to build on a hill according to this code?

On gentle slopes (less than 30 degrees), preferably in the middle third of the slope, avoiding ridge tops, valley bottoms, and areas with evidence of past instability (Clause 4).

What type of foundation is recommended for sloped ground?

Stepped foundations that follow the natural slope are recommended over cut-and-fill methods that create large, flat benches, which can destabilize the hillside (Clause 6.2).

What building shapes should be avoided in hilly, seismic areas?

Long, narrow buildings and complex shapes like 'L', 'T', or 'U' should be avoided. If complex shapes are necessary, they should be separated into simple rectangular blocks by crumble sections (Clause 5.2).

Are there restrictions on building height in hilly areas?

Yes, buildings should be kept low-rise. The code recommends a maximum height of two storeys or 7.5 meters to maintain stability and reduce visual impact (Clause 5.1.2).

IS 14804

: 2000

Siting, Design and Selection of Materials for Residential Buildings in Hilly Areas - Guidelines

CurrentSpecializedGuidelinesBIMGeotechnical · Hill Area Development Engineering

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This standard provides guidelines for the siting, planning, design, and selection of materials for residential buildings in hilly areas. It emphasizes safety against natural hazards like landslides, earthquakes, and floods, and promotes construction practices that are in harmony with the fragile hill environment.

Siting, Design and Selection of Materials for Residential Buildings in Hilly Areas - Guidelines

Quick Reference Values

Maximum recommended slope for building30 degrees

Preferred building location on slopeMiddle one-third of the slope

Recommended building shapeSimple, compact, and symmetrical (e.g., square, rectangle)

Maximum building length to width ratio1.5:1

Recommended maximum building height2 storeys or 7.5 m

Minimum foundation depth on slopes1.2 m below ground level

Practical Notes

Prioritize a thorough geotechnical investigation to assess slope stability, soil type, and groundwater conditions before any design or construction.

Effective site drainage is paramount. Ensure proper diversion of surface runoff away from the building and foundations to prevent soil saturation and instability.

Prefer lightweight construction materials (e.g., timber, steel frames, lightweight concrete blocks) to reduce the building's seismic mass and load on foundations.