- GIF rental area Total floor space for rental or lease according to GIF standards.
- German Construction Number A 7-digit identification number for public structures used throughout Germany.
- gabbro A coarse-grained volcanic rock formed when lava hardens underground.
- gabled roof A roof which slopes evenly in two directions from a central ridgeline, forming two flat gabled sides at opposite ends.
- gaelic football/hurling A rectangular grass field for Gaelic football with H-shaped goals at both ends.
- gallery Space for the sale or temporary exhibition of artworks or crafts.
- game store Retail space specializing in the sale of games, whether electronic or non-electronic.
- games Spaces for non-athletic contests and similar recreational activities.
- gantry One or more masts supporting a horizontal beam.
- garage door manufacturer A manufacturer of door used for vehicle traffic into and out of a building.
- garbage dump A resting place for regular garbage and mass quantities of waste products.
- garbage storage Space for intermediate storage of general waste materials including trash and mixed waste.
- garden A composed environment of plantings and natural or decorative features arranged aesthetically.
- garden A space landscaped with plants, which is used as an amenity.
- garden center A store specializing in the sale of plants and gardening supplies.
- garden floor A floor level which is partly below ground and partly above ground.
- gargoyle A fanciful or grotesque sculpture used as a water spout.
- gas heating (central) Heating is generated for the whole building by burning natural gas on the site.
- gas heating (floor-by-floor) Heating is generated by burning natural gas at a separate location on each floor.
- gas station A site where fuel is supplied to motorized road vehicles.
- gasoline storage Space for bulk storage of petroleum-derived motor fuel.
- gastroenterology Clinical space where doctors treat patients for conditions affecting the digestive system.
- gastronomy Spaces which serve as destinations for eating and drinking.
- gatehouse A small station where entrance to a restricted area is controlled.
- gateway A structure which frames an opening or entrance, with 2 main supports and a span.
- gazebo A simple ornamental shelter without fully enclosing walls.
- geared traction Traction elevators in which the hoisting sheave is turned by motor-driven gears.
- gearless traction Traction elevators which are moved by cables hung around a grooved sheave.
- gem mining A site where precious stones are extracted from the earth.
- gender The sex of a person, either male or female.
- general contractor The company which hires and supervises all specialized subcontractors on a construction site.
- general medicine Clinical space where doctors treat patients for a full variety of ailments and conditions.
- general store A retail space selling a variety of merchandise not restricted to any one category.
- genocide memorial A site or structure for memorializing persons killed in a regional campaign of ethnic murder.
- geographic division A geographic area with clearly defined borders which fits into a hierarchy of geo-levels.
- geographic object Any geographic area with a defined boundary, coordinates, or pathway.
- geometric pattern Different shades organized in clearly defined geometric shapes.
- geophysical research A facility devoted to experiments and studies about the Earth using physical methods.
- geotechnical engineering A company which calculates soil conditions and foundation requirements for a structure.
- geothermal heating Heating is generated by transferring natural heat underneath the building or nearby into the interior.
- geothermal power plant A facility for generating electric power by harnessing heat energy from the earth's crust.
- geriatrics Clinical space where doctors specialize in age-related conditions.
- german restaurant A restaurant specializing in German cuisine.
- gift shop Retail space devoted to the sale of attractive items that can be given as presents.
- glass A smooth and normally transparent silicate material (only counts as a facade material when used between windows).
- glass Roofing made of glass, either as an opaque coating or in the form of an extended skylight.
- glass Flooring made of glass, either for a smooth surface or to enable transparency.
- glass brick Window openings filled with thick translucent glass masonry units.
- glass fabricator A manufacturer of glass independently of window or facade framing systems in a building.
- glass partitions Walls made of transparent or translucent glass are installed in tenant areas.
- gold A dark shade of yellow without significant tinting from other hues.
- gold mine A site where naturally occurring gold ore is extracted from the earth.
- goldenrod A very dark brownish or orangish shade of yellow.
- golf A large field where players hit balls into small holes from a great distance in as few strokes as possible.
- golf course A grassy landscaped area with fairways and holes for the game of golf.
- golf equipment store Retail space specializing in golfing equipment, such as clubs and golfing attire.
- googie Jazzy and futuristic architecture of the 1950s and 1960s evoking the Space Age.
- gothic European architecture of the late Middle Ages with light stone frameworks, vertical detailing, and extensive tracery.
- government Groups and branches belonging to the legally ruling authorities of any geographic area.
- government Special governmental spaces for public interaction.
- government database A collection of data which is maintained and issued by a governmental agency or authority.
- government hospital A general-care hospital operated by a governmental organization.
- government ministry A high-level executive department of a national or sub-national government.
- government office Administrative working space for public authorities.
- government services Office space for administration or disbursement of government services.
- gradation Continuous variation in color across a surface without clear boundaries between colors.
- graduation tower A wall-like or tower-like framework built to hold a mesh for the production of salt or salt spray.
- grain cultivation Areas for growing and harvesting grasses and similar plants for their seeds.
- grain storage Space for bulk storage of food grains.
- grand entrance hall A premium or high-end lobby, at least twice the height of a regular floor.
- granite A hard and durable rock with a speckled, grainy composition.
- granite Flooring made of pavers or tiles cut from natural granite stone.
- granite quarry A site where slabs or blocks of granite stone are extracted from the earth.
- granulated cork Small pieces of cork packed into walls or roofs as thermal insulation.
- grape A medium and somewhat reddish shade of purple.
- grass Ground covered with densely grown grass plants.
- gravel quarry A site where loose rock particles are extracted from the earth.
- gravel storage Space for bulk storage of loose rock particles between 2-64 millimeters in diameter.
- graves Space for the indefinite burial or holding of dead bodies.
- gravity dam A water barrier relying on its own massive weight for stability.
- gray The color of tin or pewter.
- greek restaurant A restaurant specializing in Greek cuisine.
- green Colors with a greenish hue, ranging from light green or chartreuse to very dark olive or forest green.
- green A medium, neutral shade of green; the color of grass.
- green building A building that meets a high standard for energy efficiency and environmental sustainability.
- green certificate Certification for any factors related to environmental sustainability.
- green feature A special property of a structure which contributes to its energy efficiency or environmental sustainability.
- green roof An area of sod and plant life covering most of a building's roof plane.
- green wall An exterior wall designed to support substantial plant growth.
- greengrocer A retail location specializing in fresh vegetables and/or fruits.
- greenhouse A substantially transparent or translucent structure designed to replicate outdoor conditions inside.
- gristmill A facility where food grains are ground into flour.
- grocery store A store selling a small to medium assortment of food.
- gross floor area The total area of all interior spaces within an object, including occupied, common, and utility areas.
- gross floor area above ground The total area of interior floor spaces within an object which are nearly level with or higher than an outdoor entrance.
- gross floor area below ground The total area of interior floor spaces within an object which are more than 1 meter below an outdoor entrance.
- ground surveyor A surveyor whose role is limited to preparing precise maps of a building site.
- groundbreaking ceremony A celebratory event marking the recent, actual, or impending commencement of construction.
- group of companies A corporate union or association of multiple companies which retain their separate identities.
- group of structures A defined collection of proximate structures which belong to a single development or whose modules overlap significantly.
- guard tower A fortified tower built as part of a city wall.
- guest house Lodging facilities for invited guests or for visitors of a particular affiliated place, group, or event.
- guided busway A track for rubber-tired buses, often operated automatically without drivers.
- guided pathway A transportation corridor in which vehicles are guided by tracks, wires, or other infrastructure.
- guideway transport system An installed network of guideways used for internal delivery and distribution.
- gurdwara A place of worship and ritual in the Sikh faith.
- gutting begins Substantial demolition of a built object's non-structural components begins.
- gutting ends Substantial demolition of a built object's non-structural components is finished or halted.
- gymnastics Space for gymnastic practice or performance, with an open floor and various gymnastic equipment.
- gynecology Clinical or practice space devoted to female-specific health topics.
- gypsum quarry A site where calcium sulfate dihydrate is extracted from the earth.
- gyro tower A tower with an observation disc which rotates and rises along a stem.