Advantages of Hollow Blocks:

Cost effective:
With hollow block system, one block replaces 4.5 traditional bricks and the price of 4.5 traditional bricks is greater than one block. Since the blocks are sideways, you can also save on the sideways brick laying mortar required in conventional brickwork. Due to the lighter weight of the blocks the size of the structural members of both the foundation and superstructure is reduced which results in significant cost saving in the structural design of the building.
Faster construction:
The blocks allow an efficient construction process since there is no need of mortar in sideways brick layering. This results in faster construction, thereby also saving delayed project costs and minimising cost.
Durability:
Since durability is a huge factor when it comes to building materials, the hollow block proves to be the ideal product. They are able to withstand an extremely high level of loading. Added advantages include no efflorescence or water absorption which prevents dampness of the wall making it more durable. It is also fire, thermal and sound resistant.
Eco-friendly:
Hollow blocks are very much environment friendly since these are machine made concrete blocks unlike the traditional mud baking way which releases harmful fumes.
Thermal Insulation for Comfortable interiors:
A structure made of hollow blocks gives you a comfortable interior since it is a natural heat absorber, keeping your room cool in summer and warm in winter.
Greater earthquake resistance:
Walls made of hollow blocks offer better resistance to earthquake horizontal thrust due to the mechanism. Another reason for its superior earthquake resistance is that it is extremely light weight which reduces building load significantly. This provides a stable foundation and makes it better earthquake resistant.