Affordability in housing is often defined by the ratio of purchase price or rent, to total household income. At present, public low-cost housing units in Malaysia are sold or rented at below market price value being subsidized by the government. This housing affordability definition overlooks other important issues such as long-term operational costs, where a typical low-income household spends a substantial share of monthly income on energy and utility services such as electricity and water. This paper presents a brief overview to how low-cost housing can contribute to sustainable development in terms of long-term operational affordability for social and economical sustainability.