৪৯তম বিসিএস ⎯ গার্হস্থ্য অর্থনীতি [৩৯১]

According to the Building Construction Rules 2008, it is mandatory to keep an open space (zoning area) around any building on a plot. 

Factors to Consider Land, Home or Flat 
Surrounding Environment:When selecting a house or flat, the first priority should be the surrounding environment. A good environment supports the mental and social development of children.

Land Area:Sufficient space is necessary when selecting a house or flat. According to municipal authority regulations:
On 4 kathas of land, a house of 1,900 sq. ft. per floor can be built.
On 3 kathas, 1,400 sq. ft. per floor.
On 2 kathas, 960 sq. ft. per floor.
On 1 katha, 480 sq. ft. per floor.

Legal Documents:It is important to check whether the land, house, or flat has proper legal documents. If necessary, expert advice should be sought.Without proper documents, future legal issues may arise.

 Large walls are ideal for placing big furniture like beds or wardrobes to optimize floor space and ensure harmonious arrangement.

Colors influence mood: warm colors (red, orange) excite, cool colors (blue, green) calm.
​Warm Colors

​Red: Stimulates energy, increases heart rate, and can evoke excitement, passion, or even aggression. It’s often used to grab attention (like in warning signs or advertisements).

​Orange: Promotes enthusiasm, creativity, and social interaction. It’s energetic but less intense than red.

​Yellow: Associated with happiness, optimism, and mental stimulation. It can uplift mood but excessive bright yellow may cause anxiety in some people.
Usage:
Living rooms or kitchens (to encourage energy and social activity)
Marketing materials or sale signs (to attract attention)

According to the Building Construction Rules 2008, it is mandatory to keep an open space (zoning area) around any building on a plot. In home construction, emphasis should be given not only to technology but also to natural dependency. Regardless of the design, a residential plan should include 
​
​three main zones:
1. Work Area.
2. Rest and Relaxation Area.
3. Leisure and Entertainment Area.

Analogous Colors
Definition: Colors that are next to each other on the color wheel.Effect: They harmonize naturally and create a pleasing, cohesive look.Examples:Red → Red-Orange → Orange,Blue → Blue-Green → Green
Use in Design: Often used to create calm, visually appealing compositions because the colors blend well without strong contrast.

Every room should have enough natural light, mainly from sunlight, which is beneficial for health, removes dampness, keeps the house dry and germ-free, and boosts energy.

Rest and Relaxation Area:Considered the most private part of the house, it includes bedrooms, bathrooms, and small personal rooms. It is used by family members for sleeping, resting, and bathing.

Land Area:Sufficient space is necessary when selecting a house or flat. According to municipal authority regulations:
On 4 kathas of land, a house of 1,900 sq. ft. per floor can be built.
On 3 kathas, 1,400 sq. ft. per floor.
On 2 kathas, 960 sq. ft. per floor.
On 1 katha, 480 sq. ft. per floor.

The first step is to prepare a draft design, usually by an architect.
​After selecting the land, there are three main stages in planning a house design:
1. Preparation of the draft design বাড়ির খসড়া নকশা প্রস্তুতকরণ
2. Necessary corrections and modifications প্রয়োজনীয় সংশোধন ও পরিবর্ধন
3. Preparation and approval of the final design চূড়ান্ত নকশা প্রস্তুত ও তা অনুমোদন।

Architects often draw the first design on blue paper, which is why it is called a "Blue Print" or "নীল নকশা" in English.

The front of the house should preferably face south or east to maximize sunlight and avoid cold northern winds or intense western afternoon sun.

Work Area:This area is used for food preparation and serving, storage of household items, laundry, sewing, and other household tasks.

Room Shape for Aesthetic Appeal:
An “L”-shaped house is considered ideal.
Square rooms make furniture placement difficult.
Rectangular rooms are better, with dimensions such as 8×10 ft, 10×12 ft, or 12×18 ft.
The shape should allow all necessary functions to be carried out comfortably.

Complementary Colors
Definition: Colors that are directly opposite each other on the color wheel.
Effect: They create strong contrast and make each other appear more vibrant and intense when placed side by side.Examples:
Red ↔ Green
Blue ↔ Orange
Yellow ↔ Purple
Use in Design: To grab attention (e.g., advertisements, logos, warning signs),To highlight elements in art or interior design.

Yellow is a bright, warm color that reflects light and can make dark or dimly lit rooms appear cheerful and well-lit. Using yellow curtains, flowers, or wall accents can brighten a room that doesn’t get much natural sunlight.

 A kitchen with ample sunlight enhances harmony with the surroundings, as does a south-east facing house and quiet southern bedrooms.

Emphasis highlights a particular element in a room, such as a focal point like a painting, a sofa, or a decorative feature. It draws attention and creates interest, making one object stand out among others. While repetition ensures harmony and continuity, emphasis ensures that the space has a visual center or focus.

The soil used for brick-making contains mainly aluminum oxide (alumina) and silicon oxide (silica), with small amounts of limestone, magnesium, and iron.

Synthetic rubber paints form a flexible, water-repellent coating that prevents moisture from penetrating walls. They are commonly used in high-humidity areas such as bathrooms, kitchens, and damp exterior walls.

First Class Brick:
All sides — back, sides, top, and bottom — are smooth, and the edges are sharp and straight. These bricks are burnt at the correct temperature. When struck against each other, they make a ringing sound. If dropped from a height of three feet onto another brick, they do not break easily. They have no cracks or gaps. When submerged in water, these bricks absorb less than 15% water.

First Class Brick:
All sides — back, sides, top, and bottom — are smooth, and the edges are sharp and straight. These bricks are burnt at the correct temperature. When struck against each other, they make a ringing sound. If dropped from a height of three feet onto another brick, they do not break easily. They have no cracks or gaps. When submerged in water, these bricks absorb less than 15% water.

Cement hardens when it reacts with water, a process known as hydration.Curing is the controlled process of keeping the cement and concrete moist after it is placed, so that it gains strength and durability. Proper curing prevents cracks, ensures full hydration, and improves the overall quality of the concrete.

Seasoning of wood:Wood is cut into planks and left in shade for seasoning. Commercially, steaming is used for rapid seasoning.

Glass is primarily made from silica sand. The sand is melted at high temperatures along with small amounts of soda and lime to form molten glass, which is then cooled and shaped.

Jhama Brick:
When bricks are burnt under excessive pressure, they usually become black and porous. These are called Jhama bricks.

Third Class Brick:
These bricks are poorly burnt and of low quality. They break easily and do not make sound when struck. When soaked in water, they become soft and heavy. Their water absorption capacity is more than 25%.

Second Class Brick:
These bricks are of lower quality than first class and are burnt at a slightly lower temperature. Their edges and sides are slightly crooked. When struck against another brick, they do not make a sharp sound. They have cracks. Their water absorption capacity is more than 20%.

Blue has a calming effect on the mind and body. It promotes relaxation, serenity, and mental clarity, making it ideal for spaces where peace and focus are desired, such as bedrooms, study rooms, or meditation areas.

Cement is the main ingredient for any permanent construction work. The artificial stone made by mixing sand, aggregate (khoya), cement, and water is called concrete. Joseph Aspdin invented cement in the mid-18th century. 

Asymmetrical balance occurs when objects of different sizes, shapes, or colors are arranged so that the visual weight on both sides feels balanced, even though they are not identical.It creates a dynamic, interesting, and informal look compared to symmetrical balance.Example: A large sofa on one side of a room balanced by a group of smaller chairs and a tall lamp on the other side.

Architectural flaws are imperfections in the structure or design of a building, such as awkward corners, low ceilings, uneven walls, or poorly proportioned rooms.Furniture placement and decoration can visually balance or hide these flaws:
1.Placing tall furniture against a low wall can make it appear proportional.
2.Using rugs, curtains, or partitions can mask irregular spaces.
3.Arranging furniture to guide movement can reduce the impact of awkward layouts.

Marble is valued for its beauty and is commonly used in house construction for aesthetic purposes, such as flooring or decoration.

Tin:Tin is a major construction material used for roofing, walls, or fences, especially in rural areas. Painting tin improves its durability and appearance.

In interior design, symmetrical balance occurs when objects on either side of a central axis (like a wall, sofa, or room center) are identical or very similar in size, shape, color, or arrangement.It creates a sense of stability, order, and harmony.Example: A sofa with identical side tables and lamps on both ends demonstrates symmetrical balance.

Light colors (such as white, cream, pale yellow, or light pastels) reflect more light, creating a sense of openness and spaciousness. They make walls and ceilings feel farther apart, giving the illusion of a bigger room.

The first cement was made using limestone collected from the Portland quarries, which is why it is called Portland cement. Portland cement is generally used for house construction. The composition of cement includes limestone (72%), clay (25%), and gypsum (3%).

Silicate paints are waterproof and resistant to salts and alkalinity, making them suitable for exterior walls, masonry, and humid environments. They chemically bond with mineral surfaces, providing durable and long-lasting protection against moisture and saline conditions.

​Rhythm is the principle that guides the viewer’s eye smoothly through a space.It creates a sense of order, flow, and continuity in a room.Repetition of colors, shapes, patterns, or textures establishes rhythm, but ultimately, it works by directing the observer’s gaze along a visual path.Example: A series of identical chairs, a row of lamps, or alternating colors along a wall creates a visual rhythm that leads the eye naturally.

Monochromatic schemes use different shades, tints, or tones of a single color. This creates a balanced, cohesive, and harmonious look because all the colors naturally match each other.

Cool colors create a calm, relaxing, and comfortable environment. They help reduce stress and provide a soothing atmosphere, which is especially beneficial for older adults.

Visual harmony can be symmetrical or asymmetrical.

Plastic/emulsion paints are water-based, so the water evaporates quickly, allowing the Plastic paint to dry much faster than oil-based paints like enamel or epoxy. 

Cement mixed with water must be used within 30 minutes. After 30 minutes, the strength of the cement starts to deteriorate. The setting time of cement is 10 hours. However, for cement to fully harden under normal conditions, it takes 28 days (4 weeks).

Sylhet’s sand is mostly coarse and is good for concrete. Fine sand is used for plastering work, while pit sand is used only for filling land.

Green is associated with nature and renewal. It has a refreshing and calming effect on the mind, promotes relaxation, reduces stress, and helps maintain a sense of balance and mental freshness.

Sand is an important construction material used in making concrete. Sand is mainly divided into three types:i. Coarse sandii. Fine sandiii. Pit sandSylhet’s sand is mostly coarse and is good for concrete. Fine sand is used for plastering work, while pit sand is used only for filling land.