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1 Undershaft
London
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Height
289.9 m
/ 951 ft
Floors
73
Official Name
The current legal building name.
1 Undershaft
Other Names
Other names the building has commonly been known as, including former names, common informal names,
local names, etc.
The Shaft, No. 1 Undershaft; Trellis
Type
CTBUH collects data on two major types of tall structures: 'Buildings' and 'Telecommunications /
Observation Towers.' A 'Building' is a structure where at least 50% of the height is occupied by usable
floor area. A 'Telecommunications / Observation Tower' is a structure where less than 50% of the
structure's height is occupied by usable floor area. Only 'Buildings' are eligible for the CTBUH
'Tallest Buildings' lists.
Building
Status
Completed
Architecturally Topped Out
Structurally Topped Out
Under Construction
Proposed
On Hold
Never Completed
Vision
Competition Entry
Canceled
Proposed Renovation
Under Renovation
Renovated
Under Demolition
Demolished
Canceled
Country
The CTBUH follows the United Nations's definition of Country, and thus
uses the lists and codes established by that organization.
City
The CTBUH follows the United Nations's definition of City, and thus uses the
lists and codes established by that organization.
Address
Function
A single-function tall building is defined as one where 85% or more of its usable floor area is
dedicated to a single usage. Thus a building with 90% office floor area would be said to be an
"office" building, irrespective of other minor functions it may also contain.
A mixed-use tall building contains two or more functions (or uses), where each of the functions occupy a significant proportion of the tower's total space. Support areas such as car parks and mechanical plant space do not constitute mixed-use functions. Functions are denoted on CTBUH "Tallest Building" lists in descending order, e.g., "hotel/office" indicates hotel function above office function.
A mixed-use tall building contains two or more functions (or uses), where each of the functions occupy a significant proportion of the tower's total space. Support areas such as car parks and mechanical plant space do not constitute mixed-use functions. Functions are denoted on CTBUH "Tallest Building" lists in descending order, e.g., "hotel/office" indicates hotel function above office function.
Office
Structural Material
All-Steel
Both the main vertical/lateral structural elements and the floor spanning systems are constructed from steel. Note that a building of steel construction with a floor system of concrete planks or concrete slab on top of steel beams is still considered an “all-steel” structure as the concrete elements are not acting as the primary structure.
All-Concrete
Both the main vertical/lateral structural elements and the floor spanning systems are constructed from concrete which has been cast in place and utilizes steel reinforcement bars and/or steel reinforced concrete which has been precast as individual components and assembled together on-site.
All-Timber
Both the main vertical/lateral structural elements and the floor spanning systems are constructed from timber. An all-timber structure may include the use of localized non-timber connections between timber elements. Note that a building of timber construction with a floor system of concrete planks or concrete slab on top of timber beams is still considered an “all-timber” structure as the concrete elements are not acting as the primary structure.
Mixed-Structure
Utilizes distinct systems (e.g. all-steel, all-concrete, all-timber), one on top of the other. For example, a Steel Over Concrete indicates an all-steel structural system located on top of an all-concrete structural system, with the opposite true of Concrete Over Steel.
Composite
A combination of materials (e.g. steel, concrete, timber) are used together in the main structural elements. Examples include buildings which utilize: steel columns with a floor system of reinforced concrete beams; a steel frame system with a concrete core; concrete-encased steel columns; concrete-filled steel tubes; etc. Where known, the CTBUH database breaks out the materials used within a composite building’s primary structural elements.
Both the main vertical/lateral structural elements and the floor spanning systems are constructed from steel. Note that a building of steel construction with a floor system of concrete planks or concrete slab on top of steel beams is still considered an “all-steel” structure as the concrete elements are not acting as the primary structure.
All-Concrete
Both the main vertical/lateral structural elements and the floor spanning systems are constructed from concrete which has been cast in place and utilizes steel reinforcement bars and/or steel reinforced concrete which has been precast as individual components and assembled together on-site.
All-Timber
Both the main vertical/lateral structural elements and the floor spanning systems are constructed from timber. An all-timber structure may include the use of localized non-timber connections between timber elements. Note that a building of timber construction with a floor system of concrete planks or concrete slab on top of timber beams is still considered an “all-timber” structure as the concrete elements are not acting as the primary structure.
Mixed-Structure
Utilizes distinct systems (e.g. all-steel, all-concrete, all-timber), one on top of the other. For example, a Steel Over Concrete indicates an all-steel structural system located on top of an all-concrete structural system, with the opposite true of Concrete Over Steel.
Composite
A combination of materials (e.g. steel, concrete, timber) are used together in the main structural elements. Examples include buildings which utilize: steel columns with a floor system of reinforced concrete beams; a steel frame system with a concrete core; concrete-encased steel columns; concrete-filled steel tubes; etc. Where known, the CTBUH database breaks out the materials used within a composite building’s primary structural elements.
All-Steel
Height
Architectural
Height is measured from the level of the lowest, significant, open-air, pedestrian entrance to
the architectural top of the building, including spires, but not including antennae, signage,
flag poles or other functional-technical equipment. This measurement is the most widely utilized
and is employed to define the Council on Tall Buildings and Urban Habitat (CTBUH) rankings of
the "World's Tallest Buildings."
289.9 m / 951 ft
To Tip
Height is measured from the level of the lowest, significant, open-air, pedestrian entrance to
the highest point of the building, irrespective of material or function of the highest element
(i.e., including antennae, flagpoles, signage and other functional-technical equipment).
289.9 m
/ 951 ft
Occupied
Height is measured from the level of the lowest, significant, open-air, pedestrian entrance to
the highest occupied floor within the building.
279.9 m
/ 918 ft
Floors Above Ground
The number of floors above ground should include the ground floor level and be the number of main
floors above ground, including any significant mezzanine floors and major mechanical plant floors.
Mechanical mezzanines should not be included if they have a significantly smaller floor area than
the major floors below. Similarly, mechanical penthouses or plant rooms protruding above the general
roof area should not be counted. Note: CTBUH floor counts may differ from published accounts, as it
is common in some regions of the world for certain floor levels not to be included (e.g., the level
4, 14, 24, etc. in Hong Kong).
73
Floors Below Ground
The number of floors below ground should include all major floors located below the ground floor
level.
3
# of Elevators
Number of Elevators refers to the total number of elevator cars (not shafts) contained within a
particular building (including public, private and freight elevators).
17
Top Elevator Speed
Top Elevator Speed refers to the top speed capable of being achieved by an elevator within a
particular building, measured in meters per second.
7 m/s
Tower GFA
Tower GFA refers to the total gross floor area within the tower footprint, not including adjoining
podiums, connected buildings or other towers within the development.
154,100 m² / 1,658,719 ft²
Architect
Design
Usually involved in the front end design, with a "typical" condition being that of a leadership role through either Schematic Design or Design Development, and then a monitoring role through the CD and CA phases.
Structural Engineer
Design
The Design Engineer is usually involved in the front end design, typically taking the leadership role in the Schematic Design and Design Development, and then a monitoring role through the CD and CA phases.
MEP Engineer
Design
The Design Engineer is usually involved in the front end design, typically taking the leadership role in the Schematic Design and Design Development, and then a monitoring role through the CD and CA phases.
Other Consultant
Other Consultant refers to other organizations which provided significant consultation services for a building project (e.g. wind consultants, environmental consultants, fire and life safety consultants, etc).
Other Consultant refers to other organizations which provided significant consultation services for a building project (e.g. wind consultants, environmental consultants, fire and life safety consultants, etc).
Planning
Vertical Transportation
You must be a CTBUH Member to view this resource.
Owner/Developer
Aroland Holdings
Architect
Design
Usually involved in the front end design, with a "typical" condition being that of a leadership role through either Schematic Design or Design Development, and then a monitoring role through the CD and CA phases.
Structural Engineer
Design
The Design Engineer is usually involved in the front end design, typically taking the leadership role in the Schematic Design and Design Development, and then a monitoring role through the CD and CA phases.
MEP Engineer
Design
The Design Engineer is usually involved in the front end design, typically taking the leadership role in the Schematic Design and Design Development, and then a monitoring role through the CD and CA phases.
Other Consultant
Other Consultant refers to other organizations which provided significant consultation services for a building project (e.g. wind consultants, environmental consultants, fire and life safety consultants, etc).
Other Consultant refers to other organizations which provided significant consultation services for a building project (e.g. wind consultants, environmental consultants, fire and life safety consultants, etc).
Marketing
D-BOX
Planning
Vertical Transportation
CTBUH Initiatives
CTBUH UK Chapter Hosts: Geometry of Tall Buildings
29 January 2018 - Event
Videos
29 January 2018 | London
"Geometry of Tall Buildings" - a CTBUH United Kingdom Chapter Event
The London Committee of the CTBUH United Kingdom Chapter recently hosted [i]Geometry of Tall Buildings[/i], a conversation between leading architects and engineers on the geometry...
Research
17 October 2016
1 Undershaft – The City of London’s New Skyscraper Where the Public Comes First
Eric Parry, Nick Jackson & Tanya Parkin, Eric Parry Architects
The paper will describe the aims underpinning the proposed development at 1 Undershaft in the City of London. The project will be exemplary in putting...
Global News
27 November 2019
New London Skyscraper Gets Approved After Three Year Wait
London’s future second-tallest building, 1 Undershaft, has been given the go-ahead after a three-year battle. The 951-foot (290-meter) skyscraper, nicknamed “The Trellis,” will be topped...
Videos
29 January 2018 | London
"Geometry of Tall Buildings" - a CTBUH United Kingdom Chapter Event
The London Committee of the CTBUH United Kingdom Chapter recently hosted [i]Geometry of Tall Buildings[/i], a conversation between leading architects and engineers on the geometry...
17 October 2016 | London
CTBUH Video Interview – Eric Parry
Eric Parry of Eric Parry Architects is interviewed by Chris Bentley during the 2016 CTBUH China Conference. Eric discusses the design process of 1 Undershaft...
Global News
27 November 2019
New London Skyscraper Gets Approved After Three Year Wait
London’s future second-tallest building, 1 Undershaft, has been given the go-ahead after a three-year battle. The 951-foot (290-meter) skyscraper, nicknamed “The Trellis,” will be topped...
06 August 2019
London Skyscraper in Question as Investor Pulls Out
Asian developer Perennial Real Estate Holdings has dealt a blow to Eric Parry Architects’ approved plans to build the tallest building in the City of...
27 March 2019
Tulip Tower Set for City of London Approval
City of London planning officers have recommended approval for Foster + Partners’ opinion-splitting Tulip on a site next to the Gherkin. The planned 305-meter-tall tourist...
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