Structural engineering

Structural engineering for facades and special structures.

Steel, glass and natural stone — extra design capacity for engineering offices.

DIAGRID SHELL · TREE FUNNEL — DRAG TO ROTATE
0+
Years of experience
0+
Projects delivered
FRA · BONN
Landmark projects: Frankfurt Airport & Beethovenhalle
EC · AISC
Eurocode, DIN, AISC, IBC & project-specific standards
01 — What we do

Your extension for demanding
steel-and-glass structures

We support engineering offices with the structural design of demanding steel-and-glass constructions — from calculation to production drawings. When your workload peaks or a project needs a specialist, we plug in.

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02 — Why 21 Structures

Specialists, not generalists

/ 01

Specialists, not generalists

Steel and glass facades, glass roofs and custom structures are our core work — not a sideline.

/ 02

Code-compliant

Every calculation follows the standard your project requires — Eurocode, DIN, AISC, ASCE, IBC or client-specific codes.

/ 03

Reliable delivery

Clear communication, agreed deadlines, fabrication-ready shop drawings on request.

03 — How we work

From enquiry to checkable calculation

1

Brief us

Send drawings and scope; we reply within 24 hours with feasibility and a quote. NDA on request.

2

We calculate

Code-compliant structural design in RFEM / RSTAB, with agreed milestones and precise communication.

3

You deliver

Checkable calculation report — and, on request, fabrication-ready shop drawings.

04 — Selected projects

Proven on landmark projects

Curved steel-and-glass passenger box during construction, Terminal 3 Frankfurt Airport
Duty-free, Pier H+J

Terminal 3, Frankfurt Airport

Structural design of 22 passenger boxes and 10 smoke screens in a steel-and-glass construction.

Steel + GlassStructural calculation
28 × 28 m atrium glass roof carried by tree-shaped steel columns, Amazon office building Munich
Atrium glass roof

Amazon office building, Munich

Structural design of a 28 × 28 m glass roof at 23 m height, carried by three tree-shaped columns.

Steel + GlassStructural calculation
Natural stone facade on a steel and aluminium substructure, Beethovenhalle Bonn
Natural stone facade

Beethovenhalle, Bonn

Structural design of a natural stone facade in a steel and aluminium substructure.

Natural stone + SteelStructural calculation

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05 — Contact

Need extra structural design capacity?

Tell us about your project — we reply within 24 hours.

Start a project