We are a company that started with its craftsmanship through:

  • solid growth
  • innovative product development
  • committed employees
  • market-oriented applications
  • years of experience

…and has grown to an industrial company that produces quality products for optimal use for our customers.

The company HK BALKONBAU GmbH originated from the company Stahlbau Kreyenberg that has been operating through the founder Hermann Kreyenberg since 1983 in heavy steel construction. Within the frame of the steel construction work, also balconies were built out of steel.

The development of steel/ reinforced concrete balcony systems led to more possibilities of application and higher demand so that in 1990 the independent company HK BALKONBAU GmbH was founded.

The steel component, which previously had been produced in a time-consuming steel frame, trapezoidal plate and epoxy screed, has been replaced by a prefabricated reinforced concrete slab.

This is manufactured in quality-monitored prefabrication plants and is combined with steel supports which use the high load-bearing strength of the steel.

In 1992, a larger production facility was built as the company premises on Hafenstaße burst at the seams and could no longer cope with two expanding companies- Stahlbau Kreyenberg and HK BALKONBAU GmbH. With the purchase of the new production facility „Am Alten Viehhof“ a more rational serial production was started which enabled us to produce up to 4,500 balconies per year.

The production and also the assembly of such quantities can only be achieved with adequate equipment and well-trained personnel.

A computer-controlled saw/drilling line for steel enables several processing steps of the square tube supports in one operation.

In 2000 the aluminium balcony was added to the product range. In order to offer competitive balconies from the outset, a new production hall of 1,000 m2 was built with an investment of €1 Mio. and equipped with state-of-the-art CNC technology and workstations.

The investment was designed for an annual capacity of 2,000 finished aluminium balconies in one-shift operation.

For balconies and glazing, HK BALKONBAU GMBH is the right partner with its experience, its employees, its know-how and its technology. 

Individual Solutions become our standard.


As one of the oldest companies in the industry, HK BALKONBAU GMBH is the leading company in the field of free-standing balconies and an experienced and reliable partner. Benefit from more than 30 years of experience from over 40,000 free-standing balconies.

For our products we guarantee the highest functionality, quality and durability. Strictly controlled workshop production, state-of-the art technology and extensively trained personnel support the reliable and fast execution of your construction projects. The close cooperation with STAHLBAU KREYENBERG also offers a wide range of creative design skills in steel construction.

We offer comprehensive support:

  • Consulting and planning, statics,
  • In-house production
  • Supervising
  • Logistics

Nationwide only:

  • Building permit application
  • Construction management incl. foundation and demolition work
  • Tenant support
  • Delivery of unitized elements in company-owned vehicles
  • Installation of the balconies incl. detailed work (privacy screen, roof or façade works, curtain wall, glazing, railings, louver panels, windows, doors, etc.)

We are certified according to EN 1090-2 and EU 1090-3 EXEC 2 with the required welding certifications.


Aluminium balconies self-supported or cantilevered

  • Fully unitized balcony systems for easy and fast installation processes
  • One-piece in size up to 10m x 3.34m
  • With square/round tube supports, aluminium design (double T-optic)
  • Internal drainage system
  • Brackets with Thermal Breaks

Reinforced concrete balconies

  • Individual sizes up to 6.00 x 3.30 m
  • With square/round tube supports, aluminium design (double T-optic)

Loggia extensions in concrete or aluminium

Concrete loggias

Balcony glazing 

Additional services associated with balconies:

  • Building application
  • Windows
  • Railings (balustrades)
  • Louver Panels (sun protection)
  • Sun Protection
  • Demolition
  • Façade works
  • Ventiladed Curtain Walls
  • Foundations
  • Tenant support
  • Supervising

Aluminium or steel storage rooms for bicycles and bins


The different parts for individual construction projects are assembled in the factory.

The holes are in the right place as well as the rivet nuts and the consoles. In order to ensure the safe and smooth delivery of all components, special transport frames and well-thought out transport systems are used.

The fully pre-assembled balcony components are wrapped in foil and arrive in the best condition at the construction site.

We usually use special roll platforms to avoid unnecessary lifting of the balcony panels.


In order to avoid logistical bottlenecks, the delivery  is carried out by company-owned trucks. We guarantee the safe transport of the pre-assembled components by means of thought-out transport systems.

Short construction times due to the use of state-of-the art assembly technology, company-owned special cranes and competent and well -trained employees.

Smooth construction process with our own assembly teams and minimal tenant nuisance without using the living area.

Our well-coordinated teams work hand-in-hand.

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