The main types of bricks used in house construction in India are burnt clay (red) bricks, fly ash bricks, AAC blocks, solid and hollow concrete blocks, and a few special-purpose bricks such as fire bricks and engineering bricks. For most Delhi NCR homes the real choice is between red clay bricks, fly ash bricks and AAC blocks, and the right one depends on whether the wall is load-bearing, how much weight the frame can carry, and your budget. This guide explains each type, how burnt clay bricks are classified, where each one belongs in a house, and what they cost in 2026.
Types of Bricks in India at a Glance
Bricks and blocks are grouped by the raw material and how they are made: fired in a kiln, cured with water, or autoclaved under steam pressure. The table below compares the types of bricks used for construction that you will actually be offered by dealers and contractors around NCR. Prices are indicative 2026 ranges and move with season, kiln availability and transport distance.
| Type | Made from | Typical size | Weight | Indicative 2026 price | Best used for |
|---|---|---|---|---|---|
| Burnt clay (red) brick | Clay, moulded and kiln-fired | 230×110×75 mm (9"×4.5"×3") or modular 190×90×90 mm | Heavy | ₹7 – ₹11 per brick | Load-bearing walls, plinth, boundary walls, all-round use |
| Fly ash brick | Fly ash, lime or cement, sand or stone dust; water-cured | Similar to red brick | Slightly lighter to similar | ₹6 – ₹9 per brick | Partition and infill walls, boundary walls, budget builds |
| AAC block | Cement, lime, fly ash or sand, aluminium powder; autoclaved | 600×200 mm face, 100–250 mm thick | Very light | ₹4,000 – ₹5,500 per cu m | Infill walls in RCC-framed houses and upper floors |
| Solid concrete block | Cement, sand, aggregate | 400×200 mm face, 100–200 mm thick | Very heavy | ₹40 – ₹65 per block | Compound walls, godowns, basements |
| Hollow concrete block | Cement, sand, aggregate, with cavities | 400×200 mm face, 100–200 mm thick | Medium | ₹35 – ₹60 per block | Industrial sheds, boundary walls, non-load-bearing walls |
| Fire brick | Fire clay with high alumina | 230×115×75 mm typical | Heavy | ₹30 – ₹90 per brick | Fireplaces, kitchens with tandoors, chimneys, kilns |
1. Burnt Clay (Red) Bricks
Red bricks are the traditional choice and still the most common masonry unit in North India. Clay is moulded, dried and fired in a kiln, which gives the brick its colour and strength. They have good compressive strength, bond well with cement mortar and plaster, and have a long track record in load-bearing homes.
The downsides are weight, size variation from kiln to kiln, and higher water absorption, which means they must be soaked before laying and can show efflorescence (white salt patches) if the clay or water is poor. Kiln pollution rules in NCR can also make supply and prices seasonal.
Classes of burnt clay bricks: the "4 types of bricks"
When textbooks or exam questions refer to the 4 types of bricks, they usually mean the four field classes of burnt clay bricks. In practice you will be offered first and second class; the others have limited uses.
- First class: well burnt, uniform in colour and size, sharp edges, and a clear ringing sound when two bricks are struck together. Used for exposed brickwork, load-bearing walls and quality construction.
- Second class: well burnt but with minor irregularities in shape or colour. Acceptable for plastered walls and general masonry.
- Third class: under-burnt, softer and more absorbent. Only suited to temporary structures in dry conditions.
- Fourth class (over-burnt or jhama): dense, distorted and dark. Not used for walls; crushed as aggregate for base concrete or roads.
Formal grading is done under the relevant BIS standard for common burnt clay bricks by compressive strength class. For important structural walls, ask the supplier for test results rather than relying on the ringing test alone.
Free toolConstruction Cost CalculatorApproximate cost to build your house — floor-wise, city-wise, by quality.Try it free2. Fly Ash Bricks
Fly ash bricks are made from fly ash (a by-product of coal-fired power plants) mixed with lime or cement and sand or stone dust, pressed in a machine and water-cured instead of fired. Because they are machine-made, they are uniform in size with clean edges, which reduces plaster thickness and mortar consumption.
They usually absorb less water than red bricks, show less efflorescence and reuse an industrial waste, which is why government policy encourages fly ash products in construction near thermal power plants. Quality depends heavily on the plant: a well-cured fly ash brick from a reputable unit is a sound walling material, while a poorly cured one can be brittle. Buy from established manufacturers and reject bricks that crumble at the edges.
Fly ash vs red bricks: which should you use?
| Factor | Red clay brick | Fly ash brick |
|---|---|---|
| Size consistency | Varies by kiln | Uniform, machine-pressed |
| Plaster and mortar use | Higher, to level uneven faces | Lower |
| Water absorption | Higher; soak before use | Generally lower |
| Efflorescence risk | Moderate to high with poor clay | Lower |
| Track record in load-bearing walls | Long and proven | Good when strength is verified |
| Environmental impact | Uses topsoil and kiln fuel | Reuses industrial waste, no firing |
| Price | ₹7 – ₹11 each | ₹6 – ₹9 each |
For an RCC-framed house, where walls only fill the gaps between columns and beams, fly ash bricks are usually the better value. For load-bearing construction, both can work, but the brick strength must match what the structural design assumes.
3. AAC Blocks
Autoclaved aerated concrete (AAC) blocks are lightweight blocks full of tiny air pockets, cured under steam pressure in an autoclave. One 600 mm block replaces several bricks, so walls go up faster with fewer joints. Their low density reduces the dead load on the frame and foundation, and the trapped air gives noticeably better heat insulation than solid brick, which helps on west-facing walls and top floors.
AAC blocks need a thin-bed jointing adhesive or a suitable mortar, careful handling at corners, and proper fixings for heavy wall-mounted items such as geysers, TVs and kitchen cabinets. They are meant for infill and partition walls in framed structures, not as load-bearing walls in a typical house. We compare them in detail in our guide to AAC blocks vs red bricks.
4. Concrete Blocks and Special-Purpose Bricks
Concrete blocks are cast from cement, sand and aggregate and cured with water. Solid blocks are dense and strong, making them suitable for compound walls, retaining walls of modest height, basements and godowns. Hollow blocks have cavities that cut weight and cost and can take vertical reinforcement where the design calls for it.
For home interiors they are less popular: heavy, thermally poor and prone to shrinkage cracks if plastered carelessly.
Special-purpose bricks
- Fire bricks (refractory bricks): withstand very high temperatures. Used to line fireplaces, barbecue pits, tandoors and chimneys.
- Engineering bricks: very dense, strong and low in absorption, used where strength and damp resistance matter, such as below damp-proof courses or in retaining structures.
- Perforated and hollow clay bricks: clay bricks with holes that reduce weight and improve insulation while keeping the look and workability of clay.
- Facing and wire-cut bricks: made for exposed brick elevations, with a consistent colour and crisp edges. They cost considerably more than common bricks.
- Sun-dried (kutcha) bricks: unfired and weak against water; not for permanent homes.
Which Brick to Use Where in Your House
Choosing between types of bricks is really about matching each wall to its job. A practical allocation for a typical RCC-framed home in Delhi NCR looks like this:
- Foundation and plinth masonry: first class red bricks or solid concrete blocks, laid in cement mortar over a proper damp-proof course.
- External walls: red or fly ash bricks for robustness, or AAC blocks where the frame is designed for them and you want better thermal comfort.
- Internal partitions and upper floors: AAC blocks or fly ash bricks to keep the load on the frame down.
- Load-bearing houses: first class red bricks or fly ash bricks of verified strength, as specified by the engineer. Our explainer on load-bearing vs frame structure covers when each system makes sense.
- Boundary walls: red bricks, fly ash bricks or hollow concrete blocks, with piers at regular intervals.
- Exposed brick elevations: wire-cut facing bricks, sealed against moisture.
Never swap one masonry type for another mid-project without checking with your structural engineer. A heavier wall than the design assumed adds load to beams and foundations.
How Many Bricks Does a House Need?
As a planning thumb rule, a framed house uses roughly 8 standard bricks per sq ft of built-up area, and a cubic metre of brick masonry takes about 500 modular bricks including mortar joints. For a 1,500 sq ft home, that is around 12,000 bricks, or about ₹84,000 – ₹1.3 lakh at 2026 red brick prices before mortar and labour. Switching internal walls to AAC blocks changes the count and cost, so compare full wall-rate quotes (material, mortar and labour per sq ft of wall) rather than unit prices alone.
Our free construction material calculator estimates bricks, cement, sand and steel from your built-up area, and the construction cost calculator gives the overall budget using basic, standard and premium rates of ₹1,650 – ₹4,200 per sq ft.
The cheapest brick per piece is not always the cheapest wall. Plaster thickness, mortar, breakage and labour speed often decide the real cost.
Quick Quality Checks at Site
- Check that bricks are of uniform size and shape with straight edges.
- Strike two bricks together: a clear metallic ring indicates good burning or curing.
- Scratch the surface with a fingernail; a good brick should not mark easily.
- Soak a sample for a day and look for white patches after drying, a sign of soluble salts.
- Ask for strength test reports for load-bearing work.
Get the Right Wall Specification for Your Home
The best brick for your house depends on the structural system, the floor count, your budget and the finish you want, and it should be decided at the drawing stage, not by whatever the contractor has in stock. Panache Architect specifies masonry as part of full structural and MEP design, so walls, beams and foundations are designed for the same loads. Book a free consultation and we will recommend the right wall specification and estimate for your plot.
