The standardised definition of saleable area for uncompleted first-hand residential properties comes into effect today, the Transport & Housing Bureau says.

The definition becomes a requirement under the Lands Department's consent scheme. Uncompleted first-hand residential properties approved for pre-sale by the department must adopt the definition in their sales brochures.

The definition includes only the unit area, the balcony and the utility platform. Other areas such as bay windows should be separately listed and not included as saleable area.

The bureau said the standardisation will further enhance the transparency and clarity of information in the sales descriptions giving buyers comprehensive information on the unit's floor area.

The Real Estate Developers Association will issue new guidelines and a standardised price list template to its members, requiring them to adopt the standardised definition.

The Estate Agents Authority will issue a practice circular to the agents, requiring them to provide buyers with comprehensive and accurate information on the floor areas of units. It will also enhance education for consumers and estate agents with the Consumer Council.