The main purpose of an apartment building is to offer secure, comfortable living for individuals or families. Apartments provide amenities and services that improve daily life. Shared spaces foster community and a sense of belonging. Their design maximizes space and efficiency, making them popular in urban areas. Solar and daylight access are crucial for apartment buildings, as they reduce reliance on artificial lighting and heating, improve energy efficiency, and enhance residential amenity through pleasant living and working conditions. Balconies or sun shading should extend far enough to shade summer sun, while allowing winter sun to penetrate living areas. Natural ventilation is the movement of sufficient volumes of fresh air through an apartment to create a comfortable indoor environment. Sustainable design practice incorporates natural ventilation, responding to the local climate, which reduces the need for mechanical ventilation and air conditioning. Acoustic privacy, fire safety, and minimum privacy separation distances Room dimensions are carefully adjusted to facilitate a variety of furniture arrangements. Efficient planning of circulation by stairs, corridors, and through rooms to maximise the amount of usable floor space.