Bricks & Blocks in Chennai: AAC, Fly Ash & Solid — 27 Oct 2026

The most common AAC block sizes for residential construction in Chennai are 4-inch (100mm) for internal partition walls and 6-inch (150mm) for external walls. 8-inch blocks are used where a thicker external wall or more thermal/acoustic separation is specified by your engineer. For a typical 2BHK or 3BHK house, 4-inch and 6-inch blocks cover most applications.

AAC (Autoclaved Aerated Concrete) blocks are approximately 3× lighter than red clay bricks, so the walls put less dead load on the structure; how much that saves depends on the structure, so ask your engineer. AAC is aerated, which gives some thermal insulation, and the blocks are more dimensionally accurate, which reduces mortar usage. They cost more per piece than bricks, so compare today's prices above.

AAC block prices in Chennai today range from ₹27 (2 inch) to ₹103 (9 inch) per piece. The popular 4-inch block is ₹49 and the 6-inch ₹71. For bulk orders, call +91 63996 96363 for a confirmed bulk/project rate.

Every 600 × 200 mm AAC block covers 0.12 m² (≈ 1.29 sq ft), so about 8.3 blocks cover one square metre and about 77 blocks cover 100 sq ft of wall, whatever the thickness. Add 3–5% for cutting and breakage. A 10 × 10 ft room with a 9 ft ceiling has about 360 sq ft of wall, which needs roughly 280 blocks before deducting doors and windows.

Whether a wall is load-bearing is decided by your structural engineer. For RCC-framed buildings (which most modern Chennai homes are), AAC blocks are used as infill walls and are NOT load-bearing. In an RCC framed structure, the steel-concrete frame carries all loads — the block walls are just partitions and enclosures.

AAC blocks are factory-made using cement, lime, fly ash, and aluminium powder under high pressure and steam (autoclaving), giving them a uniform cellular structure. Fly ash bricks are manufactured under hydraulic pressure without steam curing. AAC blocks are lighter, have better insulation, and are more dimensionally precise. Fly ash bricks are denser and cost less per piece — making them suitable for boundary walls and exterior applications where insulation is less critical.

Fly ash brick price today in Chennai is ₹10 per piece for the standard 230 × 110 × 75 mm size. Fly ash bricks are covered by IS 12894 and are widely used across Chennai for all wall types. For bulk orders, call +91 63996 96363 for a confirmed bulk/project rate.

Solid concrete block price in Chennai starts from ₹12 per piece; the rate depends on size (400 × 200 mm face in 100, 150 and 200 mm thickness, about 12.5 blocks per m² of wall). Solid blocks suit compound walls, boundary walls and retaining walls. For bulk orders, contact us for a confirmed bulk/project rate.

It depends on the wall. AAC blocks are lighter and need fewer joints; fly ash bricks cost less per piece; solid concrete blocks suit compound walls. Compare today’s rates above and confirm the choice with your engineer.

Blocks per m³ = 1 ÷ (0.6 × 0.2 × thickness in metres). For 600 × 200 mm blocks: 2 inch (50 mm) ≈ 167, 3 inch (75 mm) ≈ 111, 4 inch (100 mm) ≈ 83, 5 inch (125 mm) ≈ 67, 6 inch (150 mm) ≈ 55.6, 8 inch (200 mm) ≈ 41.7 and 9 inch (225 mm) ≈ 37.

About one 40 kg bag per ~1 m³ of 200 mm AAC blockwork, laid with thin 2–3 mm joints. Actual use varies with the wall and workmanship. AAC blocks are covered by IS 2185 (Part 3).

BuildingNeeds delivers AAC blocks, fly ash bricks and red (solid) blocks to all areas of Chennai — Anna Nagar, T. Nagar, Tambaram, Velachery, OMR, Porur, Ambattur, Avadi, Sholinganallur, Chromepet, Adyar, Guindy, Medavakkam, and other areas within Chennai. Direct site delivery within 24–48 hours. Call +91 63996 96363 or WhatsApp to order.