Austrian construction company for building construction, civil engineering, energy + telecom, timber engineering as well as concrete, asphalt and gravel production.
Leyrer + Graf Baugesellschaft m.b.H.
Gmünd · Horn · Schwechat · Vienna · Traun · Marchtrenk · Zwettl · Bad Pirawarth · Hannersdorf · Loosdorf · Villach · Lassee · Schrems · Sierning · Seibersdorf · Krems · Hagenbrunn · AistersheimNew on Amplifa
About Leyrer + Graf
Founded in 1926, Leyrer + Graf Baugesellschaft m.b.H. is an owner-managed construction company headquartered in Gmünd, Lower Austria, and one of the largest construction companies in Austria. The group employs around 2,800 staff at 19 locations and generated €635 million in construction output. Its range of services covers building construction, civil engineering (road works, earthworks, engineering and concrete construction, pipeline and railway construction), energy + telecom, timber engineering through Graf-Holztechnik GmbH, and engineering services as general and total contractor. In addition, the company operates its own production facilities: a concrete plant in Gmünd (Graf Beton), asphalt plants in Schrems, Lassee, Sierning and Seibersdorf, a gravel plant in Schrems with a 20 ha quarry and annual production of up to 250,000 t, as well as recycling plants in Krems and Hagenbrunn. Projects are digitally supported with BIM, Lean Construction Management and modern surveying.
- Site
- Gmünd
- Processes
- Building construction, Civil engineering (road construction, earthworks, engineering and concrete construction, pipeline, Energy + telecom (electrical engineering, energy infrastructure, telecom technology), Timber engineering/Timber construction, Engineering (total contractor, general planning, surveying, Graf Building Solution), Concrete production (Graf Beton, Gmünd concrete plant), Asphalt hot mix production (base layers, asphalt concrete, coloured asphalts, drain asphalts), Quarry/raw material extraction and processing (crushing, screening)
- Materials
- Concrete, Asphalt, Timber, Grader material 0/32 mm, Bedding sand 0/4 mm, Crushed grit 2/4 mm, Crushed grit 8/16 mm, Premium crushed sand EBK 0/2 mm
- Certificates
- ISO 37301 (Compliance Management System), ISO 37001 (Anti-Corruption Management System), ÖGNI certificate "Sustainable Construction Site" (first Austrian construction, ISO 37001 (Anti-Corruption Management), ÖGNI "Sustainable Construction Site", ISO 9001
- Founded
- 1926
- Employees
- 2800
- Industries
- Construction industry, Residential construction, Commercial and industrial construction, Transport infrastructure (road, rail), Energy supply, Telecommunications
- 01
Raw material extraction (Schrems quarry, crushing and screening)
- 02
Concrete and asphalt production
- 03
Recycling (construction debris, recycled asphalt)
- 04
Engineering and planning (BIM, general planning, surveying)
- 05
Construction execution building construction, civil engineering, energy +
- 06
Service (24-hour fault service energy + telecom)
Materials and Production Processes
Concrete
Own concrete production at the Gmünd concrete plant (Graf Beton) for building construction and civil engineering.
Asphalt hot mix
Produced since 1964; base layers, asphalt concrete, coloured asphalts, drain and recycled asphalts.
Timber
Used in timber construction through Graf-Holztechnik GmbH.
Grader material 0/32 mm (EN 13242)
For unbound base layers in road construction.
Frost protection 0/63 mm (EN 13242)
For unbound base layers in road construction.
Crushed grit 2/4 mm (EN 13242, EN 13043, EN 12620)
For base layers, asphalt and concrete aggregate as well as paving grit.
Premium crushed sand EBK 0/2 mm (EN 13242, EN 13043, EN 12620)
For base layers, asphalt and concrete aggregate and joint sand.
Premium grit 4/8 mm (EN 13242, EN 13043)
For unbound base layers and asphalt aggregate.
Rock chippings FBG 32/63 mm
As drainage gravel.
Service Areas and Construction Services
Inside the production
Industries
Processes & technical limits
| Processes | Tolerance | Max. part | Weight | Lot size | Materials |
|---|---|---|---|---|---|
| Building constructionConstruction/Building construction | – | – | – | – | Concrete, Timber |
| Civil engineering (road construction, earthworks, engineering and concrete construction, pipelineConstruction/Civil engineering | – | – | – | – | Concrete, Asphalt, Gravel |
| Energy + telecom (electrical engineering, energy infrastructure, telecom technology)Construction/Infrastructure | – | – | – | – | – |
| Timber engineering/Timber constructionPlastics/Timber processing | – | – | – | – | Timber |
| Engineering (total contractor, general planning, surveying, Graf Building Solution)Engineering/Planning | – | – | – | – | – |
| Concrete production (Graf Beton, Gmünd concrete plant)Casting/Concrete | – | – | – | – | Concrete |
| Asphalt hot mix production (base layers, asphalt concrete, coloured asphalts, drain asphalts)Construction/Asphalt | – | – | – | – | Asphalt |
| Quarry/raw material extraction and processing (crushing, screening)Construction/Raw materials | – | – | – | – | Gravel, Crushed grit, Fill material, Frost protection |
| Recycling (recycling plants Krems, Hagenbrunn)Construction/Recycling | – | – | – | – | Recycled asphalt, Construction debris |
| Building Information Modeling (BIM), Lean Construction Management, augmented realityEngineering/Digitalisation | – | – | – | – | – |
8 Anlagen & Maschinen
| Machine | Manufacturer / model | Quantity | Working area | Year built | Site |
|---|---|---|---|---|---|
| Asphalt mixing plant/hot mix plant | – | – | – | – | Lassee, Schrems, Sierning, Seibersdorf |
| Jaw crusher | – | 1 | – | – | Schrems gravel plant |
| Cone crusher | – | 3 | – | – | Schrems gravel plant |
| Pre-separation screen | – | 1 | – | – | Schrems gravel plant |
| Screening plant | – | 5 | – | – | Schrems gravel plant |
| Conveyor belts | – | – | – | – | Schrems gravel plant |
| Concrete plant | – | – | – | – | Gmünd (Graf Beton) |
| Recycling plant | – | – | – | – | Krems, Hagenbrunn |
Additional services
Quality and Certification
The gravel products are subject to continuous internal and external quality control as part of CE marking. The company operates a compliance management system according to ISO 37301 and an anti-corruption management system according to ISO 37001 and, in 2025, was the first Austrian construction company to be awarded the ÖGNI certificate "Sustainable Construction Site".
| Evidence | Gmünd |
|---|---|
| ISO 37301 (Compliance Management System) | |
| ISO 37001 (Anti-Corruption Management) | |
| ÖGNI "Sustainable Construction Site" | |
| ISO 9001 |
Company History
- 1926
Foundation of a construction and carpentry business by Dipl.-Ing. Anton Leyrer.
- 1947
Franz Graf joins as a technical apprentice; in 1954 passes master builder examination as the youngest master builder in Austria at that time.
- 1958
Master builder Franz Graf becomes co-partner and managing director for the construction division.
- 1964
Death of Dipl.-Ing. Anton Leyrer; Franz Graf takes over sole management; start of asphalt production.
- 1968–1987
Development into a leading regional master builder company.
- 1988
Opening of the first operating site in Vienna.
- 1993
Foundation of Graf-Holztechnik GmbH in Horn; first step into the Czech Republic.
- 2000er
Operating sites in Linz, Schwechat and Bad Pirawarth; foundation of Graf Beton, asphalt plant Sierning, asphalt mixing plant Lassee, gravel plant Schrems.
- 2013
Stefan Graf takes over management from Franz Graf; joint venture with Ploier + Hörmann Bau GmbH.
- 2015
Relocation of Leyrer + Graf GmbH from Linz to Traun.
- 2016
Operating site of Graf-Holztechnik GmbH in Loosdorf.
- 2017
Acquisition of R & Z Bau GmbH in Villach.
- 2019
Ploier + Hörmann Bau GmbH becomes a 100% subsidiary; operating site Loosdorf.
- 2021
Further operating site in Traun with its own building construction division.
- 2022
Operating site of Graf-Holztechnik in Aistersheim; opening of the 1,400 m² training centre in Horn; award "Austria's Best Managed Companies".
- 2023
Acquisition of Netz + Plan LeitungsdokumentationsgesmbH; acquisition of 50% of the shares in Regrub Waste & Recycling GmbH.
- 2024
New office location Marchtrenk.
- 2025
Peter Haas becomes COO; opening of the "Büro 21" office building; ÖGNI certificate "Sustainable Construction Site".
- 2026
100th anniversary; modernisation of the Horn workshop; new construction yard with workshop in Schwechat.