Urban Housing — Study Notes

Key Concepts

1. Urbanisation and Its Causes

Urbanisation is the process in which more people move from rural areas to towns and cities, causing urban areas to grow.
A rural area is a countryside area with fewer people and more farming land.
An urban area is a built-up area with many people, buildings, roads, and services.

Why urbanisation happens

Better job opportunities
- Cities usually have more jobs in factories, offices, transport, retail, healthcare, and education.
- People move to cities to earn a higher income.
Better education
- Urban areas usually have more schools, colleges, and training centres.
- Families may move so children can get a better education.
Better healthcare
- Cities often have more hospitals, clinics, and doctors.
- People may move to have easier access to medical treatment.
Better infrastructure
- Infrastructure means the basic systems and services a place needs to function, such as roads, public transport, water supply, electricity, and internet.
- Urban areas usually have better transport and communication systems.
Industrialisation
- Industrialisation is the development of industries and factories in a country or area.
- Factories and businesses are often located in cities, attracting workers.
Population increase
- A city can also grow because more babies are born there and people live longer.
Rural-to-urban migration
- Migration means the movement of people from one place to another.
- Rural-to-urban migration is one of the main causes of urbanisation.

Effects of urbanisation

Positive effects:
- More economic growth
- Better access to services
- More efficient use of land through high-rise housing
Negative effects if growth is too rapid:
- Overcrowding
- Housing shortages
- Pollution
- Increased waste
- Pressure on transport, water, and electricity supply

2. Types of Housing: Formal and Informal Settlements

Formal settlements

Formal settlements are housing areas that are legally planned, built, and recognised by the government.
They usually have:
- Proper roads
- Clean water supply
- Electricity
- Sewage systems
- Waste collection
- Safer building structures

Examples of formal settlements

HDB flats in Singapore
Private condominiums
Landed housing
Government-planned apartment blocks in cities

Features of formal housing

Built according to building laws and safety rules
Residents usually have legal ownership or legal rental agreements
Better access to services and public facilities

Informal settlements

Informal settlements are housing areas built without proper legal approval or planning.
They are sometimes called slums, squatter settlements, or shanty towns.

Features of informal settlements

Houses may be built from temporary or low-cost materials such as wood, metal sheets, cardboard, or plastic.
Buildings may be crowded closely together.
There may be limited access to:
- Clean water
- Toilets and sewage systems
- Electricity
- Waste disposal
- Healthcare and schools

Why informal settlements form

Cities grow too quickly
There is not enough affordable housing
Poor families cannot afford formal housing
Migrants arriving in cities need shelter quickly

Problems in informal settlements

Poor sanitation
Spread of disease
Fire hazards
Flooding risk
Unsafe structures
Lack of security

3. Challenges of Rapid Urbanisation

Rapid urbanisation

Rapid urbanisation means cities are growing very quickly in a short time.
This can happen faster than governments can build homes and services.

Overcrowding

Overcrowding happens when too many people live in one area or one home.
Effects of overcrowding:
- Less living space
- Stress and poorer quality of life
- More traffic congestion
- Faster spread of infectious diseases
- Greater pressure on shared facilities like lifts, toilets, and public transport

Slums

A slum is a heavily crowded urban area with poor-quality housing and inadequate basic services.
Slums often develop when affordable formal housing is unavailable.

Inadequate services

Inadequate services means basic services are insufficient, poor in quality, or unavailable.
Examples:
- Not enough clean water
- Poor sanitation
- Irregular waste collection
- Limited electricity supply
- Too few schools or clinics

4. Singapore’s Public Housing: HDB Estates and Integrated Planning

HDB and public housing

HDB stands for Housing & Development Board.
HDB is the government agency responsible for planning and developing most public housing in Singapore.
Public housing in Singapore is designed to provide affordable, safe, and good-quality homes for the population.

HDB estates

An HDB estate is a planned residential area made up of HDB flats and supporting facilities.
HDB estates are found across Singapore.

Key features of HDB estates

High-rise, high-density housing
- High-density housing means many people living in a relatively small land area.
- This helps Singapore save land because Singapore is a small country with limited land area.
Different flat types
- Flats of different sizes allow families with different needs and budgets to find suitable housing.
Essential services nearby
- Schools
- Markets
- Clinics
- Shops
- Parks
- Transport nodes such as MRT stations and bus interchanges

Integrated planning

Integrated planning means planning homes together with transport, schools, healthcare, shops, recreation areas, and green spaces so that the whole town functions well.
In Singapore, housing estates are not planned as just blocks of flats. They are planned as complete communities.

Why integrated planning is important

Reduces travel time
Improves convenience
Supports healthier lifestyles
Encourages social interaction
Makes land use more efficient
Improves quality of life

Features of integrated planning in Singapore

Town centres with shops and services
Neighbourhood centres closer to homes
Schools within or near estates
Polyclinics and healthcare facilities
Parks, playgrounds, and fitness corners
Good public transport links
Walkways and sheltered linkways
Barrier-free access for elderly and wheelchair users

Void decks

Void decks are the open, sheltered ground-floor spaces beneath HDB blocks.
They are kept free of walls so that residents have a shared communal space.
Void decks are used for:
- community events such as weddings and funerals
- children’s play
- exercise by elderly residents
- bicycles and other storage
- informal social interaction among neighbours
Void decks are an important feature of Singapore’s public housing model because they encourage community bonding between residents of different backgrounds.

Town councils

Town councils are elected bodies that manage and maintain the common areas within HDB towns.
Each town council is responsible for:
- maintaining lifts, staircases, corridors, and lighting
- keeping common areas clean
- managing landscaping of gardens and open spaces
- collecting conservancy (service) charges from residents
- managing the town’s maintenance funds
Town councils help give residents a say in how their estate is run.
This supports social sustainability because residents develop a sense of ownership and responsibility for their community.

Importance of public housing in Singapore

Makes housing affordable for many citizens
Supports social stability
Helps prevent the growth of slums
Allows efficient land use
Makes it easier to provide services to many people in one area

5. Sustainable Housing Design

Sustainable development

Sustainable development means meeting present needs without reducing the ability of future generations to meet their needs.
In housing, this means building homes that are safe, efficient, and environmentally friendly.

Sustainable housing

Sustainable housing is housing designed to reduce harm to the environment while meeting people’s needs for shelter, comfort, and safety.

Green buildings

Green buildings are buildings designed, built, and operated in ways that reduce energy use, water use, waste, and environmental impact.
In Singapore, many buildings are designed with environmental features because the country has limited land and resources.

BCA Green Mark Scheme

The BCA Green Mark Scheme is Singapore’s national rating system for environmentally sustainable buildings, administered by the Building and Construction Authority (BCA).
It was introduced in 2005 to encourage the construction and operation of more environmentally friendly buildings.
Buildings are assessed on criteria such as:
- energy efficiency (e.g. efficient air-conditioning, LED lighting, solar panels)
- water efficiency (e.g. water-saving fittings, rainwater harvesting)
- indoor environment quality (e.g. natural ventilation, daylighting)
- use of sustainable materials
- green design features (e.g. green roofs, landscaping)
Rating levels (from lowest to highest): Certified → Gold → Gold Plus → Platinum.
Singapore’s target: 80% of all buildings to achieve Green Mark certification by 2030 (under the Singapore Green Plan 2030).
New public buildings must achieve Green Mark Platinum.
The scheme shows how sustainable development can be built into housing and commercial buildings to reduce environmental impact.

Energy efficiency

Energy efficiency means using less energy to achieve the same result.
Example: using LED lights instead of less efficient bulbs to produce the same brightness with less electricity.

Sustainable design features in housing

Natural ventilation
- Designing buildings so that wind can flow through them, reducing the need for air-conditioning.
Daylighting
- Daylighting means using natural sunlight to light indoor spaces.
- This reduces electricity use during the day.
Energy-efficient appliances
- Appliances that use less electricity.
LED lighting
- LED lights use less electrical energy and usually last longer.
Solar panels
- Solar panels convert sunlight into electrical energy.
Rainwater harvesting
- Collecting and storing rainwater for non-drinking uses, such as watering plants.
Water-saving fittings
- Such as low-flow taps and dual-flush toilets.
Green roofs or rooftop gardens
- Roof areas covered with plants.
- These can reduce heat and improve air quality.
Insulation
- Insulation reduces heat transfer into or out of a building.
- This helps keep indoor spaces cooler or warmer with less energy use.
Use of durable and sustainable materials
- Materials that last longer and have lower environmental impact.
Waste management systems
- Facilities for recycling and proper waste disposal.

Benefits of sustainable housing

Reduces electricity and water use
Lowers utility costs
Reduces pollution and greenhouse gas emissions
Improves comfort
Makes cities more resilient and liveable

6. Community Building in Housing Estates

Community

A community is a group of people living in the same area who interact and share facilities and responsibilities.

Community building

Community building means creating strong relationships, trust, and cooperation among residents.

Why community building is important

Helps neighbours support one another
Increases social cohesion
Social cohesion means the strength of relationships and sense of unity among people in a community.
Makes estates safer and more pleasant
Encourages care for shared spaces
Helps people of different backgrounds live harmoniously

Ways community building happens in housing estates

Shared public spaces
- Playgrounds
- Parks
- Community gardens
- Void decks
- Fitness corners
Community events
- Celebrations
- Clean-up activities
- Exercise sessions
- Festivals
Mixed amenities
- Shops, food centres, schools, and parks encourage daily interaction
Inclusive design
- Barrier-free access helps the elderly, young children, and people with disabilities use shared spaces
Resident participation
- Residents help take care of the environment and report problems

In Singapore’s context

HDB estates are designed not only for housing but also for community life.
Shared spaces encourage interaction between neighbours.
Integrated planning supports both physical needs and social needs.

7. Case Study: Comparing Urban Housing — Singapore vs Mumbai, India

The 2026 syllabus requires you to compare Singapore’s housing approach with that of a developing city. The case study below uses Mumbai, India.

Singapore

Feature	Detail
Main housing type	HDB public housing flats (over 80% of residents)
Planning	Fully planned by HDB and URA; integrated with transport, schools, shops
Affordability	Subsidised by government; sold on 99-year leases; CPF can be used
Services	All estates have clean water, electricity, sewage, waste collection
Sustainability	BCA Green Mark scheme; natural ventilation; solar panels on HDB rooftops
Community	Void decks for social interaction; town councils manage estates
Ethnic balance	Ethnic Integration Policy prevents racial enclaves

Key outcome: Singapore has virtually eliminated large-scale informal settlements (slums) through early public housing programmes starting in the 1960s.

Mumbai, India

Feature	Detail
Population	~21 million in the city; one of the world’s largest urban agglomerations
Main challenge	Rapid rural-to-urban migration has outpaced formal housing supply
Informal settlements	Approximately 40–55% of Mumbai’s population lives in slums
Dharavi	One of Asia’s largest informal settlements; ~1 million people in ~2 km²
Conditions in slums	Limited clean water; inadequate sanitation; fire risk; overcrowding
Formal housing	High property prices make formal housing unaffordable for many low-income residents
Government responses	Slum Rehabilitation Authority (SRA) schemes; some slum upgrading and resettlement programmes

Key challenge: Dharavi and similar settlements lack legal land tenure, making it difficult for residents to invest in improving their homes, and making governments reluctant to provide full services.

Comparison Summary

Criterion	Singapore	Mumbai
Housing type	Mainly formal HDB	Mix of formal and large informal settlements
Affordability	Government-subsidised	Private market; largely unaffordable for the poor
Services	Reliable piped water, sanitation, waste collection	Unreliable or absent in many slum areas
Planning	Integrated, long-term	Often reactive; insufficient for pace of migration
Sustainability features	BCA Green Mark; solar panels	Limited in informal areas; some green building initiatives in formal sector
Community structures	Town councils; void decks	Resident associations in some areas; weak in slums

Why the Difference?

Singapore benefited from strong central government control over a small city-state and invested heavily in public housing from independence (1965) onwards.
Mumbai is one city within a vast and diverse country; housing policy must compete with many other national priorities.
Singapore’s land scarcity forced creative solutions (high-rise, high-density); Mumbai has more land area but governance and funding challenges make coordinated planning difficult.

Exam Tips for Case Study Questions

When comparing, always use a clear structure: “In Singapore… In contrast, in Mumbai…”
Refer to specific named features: HDB, BCA Green Mark, void decks (Singapore); Dharavi, SRA schemes (Mumbai).
Link differences back to the three pillars of sustainability: social, economic, environmental.
For 8-mark PEEL questions, evaluate: Why is Singapore’s model hard for developing cities to replicate?

Important Definitions

Urbanisation: the process in which more people move to and live in towns and cities, causing urban areas to grow.
Urban area: a built-up area with many people, buildings, roads, and services.
Rural area: an area outside towns and cities, usually with fewer people and more open land.
Migration: the movement of people from one place to another.
Rural-to-urban migration: movement of people from countryside areas to towns and cities.
Industrialisation: the development of industries and factories in an area or country.
Infrastructure: the basic systems and services needed for a place to function, such as roads, water supply, electricity, and public transport.
Formal settlement: a legally planned and built housing area with government recognition and basic services.
Informal settlement: a housing area built without proper legal approval or planning, often lacking basic services.
Slum: a crowded urban area with poor housing conditions and inadequate services.
Overcrowding: a situation in which too many people live in one area or housing unit.
Inadequate services: basic services that are insufficient, poor in quality, or unavailable.
Public housing: housing provided or developed by the government for the public.
HDB: Housing & Development Board, the agency responsible for public housing in Singapore.
HDB estate: a planned residential area made up of HDB flats and supporting facilities.
Integrated planning: planning homes together with transport, schools, healthcare, shops, and recreation areas so the area functions well as a complete town.
High-density housing: housing that allows many people to live within a small land area.
Sustainable development: development that meets present needs without reducing the ability of future generations to meet their own needs.
Sustainable housing: housing designed to meet people’s needs while reducing environmental impact.
Green building: a building designed to reduce energy use, water use, waste, and environmental harm.
Energy efficiency: using less energy to do the same task.
Daylighting: using natural sunlight to light indoor spaces.
Insulation: material or design that reduces heat transfer.
Solar panel: a device that converts sunlight into electrical energy.
Rainwater harvesting: collecting and storing rainwater for later use.
Community: a group of people living in the same area and sharing facilities or interests.
Community building: strengthening relationships, cooperation, and belonging among residents.
Social cohesion: the strength of relationships and unity within a community.
Void deck: the open, sheltered ground-floor space beneath an HDB block, used as a communal space for residents.
Town council: an elected body responsible for managing and maintaining the common areas and facilities within an HDB town.
BCA Green Mark Scheme: Singapore’s national rating system for environmentally sustainable buildings, administered by the Building and Construction Authority; buildings are rated from Certified to Platinum based on energy efficiency, water efficiency, and other green features.
Building and Construction Authority (BCA): the Singapore government agency that oversees the building and construction sector, including the Green Mark Scheme.

First, identify two valid causes of urbanisation.
- Better job opportunities
- Better healthcare
Explain the first reason.
- People move to cities because urban areas usually have more factories, offices, and businesses.
- This gives them more chances to find work and earn a higher income.
Explain the second reason.
- Cities usually have more hospitals, clinics, and doctors.
- People move there to get easier access to medical treatment and better healthcare services.

Full answer

One reason is that urban areas provide more job opportunities. People may move from rural areas to cities to work in factories, offices, or service industries and earn a better income.
Another reason is better healthcare. Cities usually have more hospitals and clinics, so people can receive medical care more easily.

Why this answer earns marks

It gives two reasons
Each reason is explained clearly
It uses the keyword urban areas

Identify a comparison point.
- Access to basic services
Describe the formal settlement.
- Formal settlements usually have proper water supply, electricity, and sanitation.
Describe the informal settlement.
- Informal settlements often have limited or no access to these services.

Full answer

A formal settlement is legally planned and usually has basic services such as clean water, electricity, and sanitation, while an informal settlement is unplanned and often lacks these services.

Why this answer earns marks

It compares both types directly
It uses correct terms: formal settlement, informal settlement, sanitation

State a key fact about Singapore.
- Singapore has limited land area.
Link this to housing needs.
- Many people need homes, so land must be used efficiently.
Explain how high-density housing helps.
- Tall apartment blocks allow many families to live in one area.
- This saves land for roads, schools, parks, industries, and reservoirs.

Full answer

High-density housing is important in Singapore because Singapore has limited land but a large population needs housing. By building high-rise HDB flats, many families can live in a small land area. This allows land to be used efficiently and leaves space for transport, schools, parks, and other services.

Why this answer earns marks

It includes:
- limited land
- large population
- efficient land use
It explains, not just states

Common Mistakes to Avoid

Confusing urbanisation with industrialisation
- Urbanisation is growth of cities.
- Industrialisation is growth of factories and industries.
Saying all urbanisation is bad
- Urbanisation can improve jobs, education, and healthcare.
- Problems usually happen when urbanisation is too rapid or poorly managed.
Mixing up formal settlements and informal settlements
- Formal = planned and legal
- Informal = unplanned and often lacking services
Writing “slums are the same as all cities”
- Slums are only one type of poor-quality urban settlement, not all urban housing.
Forgetting to explain answers
- In exams, giving one-word answers is often not enough.
- Always link cause to effect.
Describing HDB only as “flats”
- HDB estates include flats plus schools, transport, shops, parks, and clinics.
Forgetting the idea of integrated planning
- This is a key feature of Singapore’s urban housing.
Thinking sustainable housing only means “planting trees”
- It also includes energy efficiency, water saving, good design, and use of renewable energy.
Using vague terms like “better” without saying how
- Instead of “cities are better,” say “cities have more jobs, hospitals, and schools.”
Ignoring community spaces
- Housing is not just about buildings; it is also about social interaction and shared facilities.

Exam Tips

When defining terms, use precise wording.
- Example: Urbanisation is the process in which more people move to and live in urban areas, causing cities to grow.
For comparison questions, use a direct structure:
- “A formal settlement…, whereas an informal settlement…”
For explanation questions, use because
- Example: “High-density housing is important in Singapore because land is limited.”
Include key phrases that often earn marks:
- limited land area
- high population density
- efficient land use
- basic services
- clean water and sanitation
- integrated planning
- energy efficiency
- reduces environmental impact
- community interaction
- quality of life
If asked about problems of rapid urbanisation, mention both the challenge and its effect.
- Example: “Overcrowding can increase the spread of disease because many people live in a small space.”
If asked about Singapore, mention specific features:
- HDB flats
- town planning
- MRT and buses
- nearby schools and shops
- parks and shared spaces
For sustainable housing questions, give named features and their functions:
- solar panels → produce electricity from sunlight
- natural ventilation → reduces need for air-conditioning
- LED lights → use less electricity
- water-saving fittings → reduce water use
Avoid very general answers.
- Instead of “It helps the environment,” write “It reduces electricity use and lowers pollution.”
Read the command word carefully:
- State = give a short answer
- Describe = say what it is like
- Explain = give reasons or show cause and effect
- Compare = give similarities and/or differences

Quick Summary

Urbanisation is the growth of towns and cities as more people move into urban areas.
Main causes of urbanisation include job opportunities, education, healthcare, industrialisation, and better infrastructure.
Formal settlements are planned, legal, and usually have proper services.
Informal settlements are unplanned and often lack clean water, sanitation, and safe housing.
Rapid urbanisation can cause overcrowding, slums, pollution, and pressure on services.
Singapore uses high-density public housing because it has limited land area.
HDB estates are examples of integrated planning, with homes, transport, schools, shops, parks, and clinics planned together.
Sustainable housing reduces environmental impact while meeting people’s needs.
Features of sustainable housing include natural ventilation, daylighting, solar panels, LED lights, water-saving fittings, and green roofs.
Energy efficiency means using less energy to do the same task.
Housing estates should support community building through shared spaces and activities.
Good urban housing should be safe, efficient, sustainable, and supportive of community life.