- Poorly regulated small house development lead to destruction of ecology, water pollution, unauthorized construction of roads and car parks, land filling up with waste, etc.
- Unauthorized construction of roads and parking places, as small house development does not include the provision of roads, access and parking areas
- Water pollution and flooding of effluent waters as small houses are not connected to main sewers but depend on septic tanks and soakaway pits which drain sewage into the ground. High density small house developments and high water tables result in pollution of ground waters and nearby streams, rivers and seas.
- Sediment run-off from site formation and development on surrounding waters and biodiversity;
- Tree felling for development and infrastructure facilities;
- Erosion of hill-sides and loss of vegetation for development, infrastructure facilities, site formation, slope stabilization, etc.;
- Littering and waste from construction and municipal waste disposal;
- Conversion of agricultural land to small house developments leads to loss of local ecology including fengshui woodlands and sweet water habitats.
- Clearing vegetation or tree felling on private or government land.
- Channelisation of natural streams with concrete structures.
- Increased coverage of agricultural land with developments increases run off, causes flooding problem and overloading of local drains.
Environmental threats from small house developments in or near protected areas
- Increase in traffic from the permitted development will create a demand for roads and transport facilities which will damage surrounding country parks (Once development is permitted it would be illogical to assume that such facilities would not be required or demanded.)
- Sediment run-off from site formation and development on surrounding waters and biodiversity
- Light pollution of developments, infrastructure facilities and traffic
- Tree felling for development and infrastructure facilities
- Erosion of hill-sides and loss of vegetation for development, infrastructure facilities, site formation, slope stabilization, etc.
- Increased risk of poaching associated with increase in population
- Increased fire risk associated with increase in population and traffic
- Littering and waste from construction and municipal waste disposal