Carpentry and timber construction company for roof trusses, old-building renovation, wooden facades, halls, carports and turnkey homes.
SJ-Holzbau GmbH
Rettenberg (Greggenhofen 22)New on Amplifa
About us
SJ-Holzbau GmbH is a traditional carpentry business from Rettenberg in the Allgäu region, deeply rooted in craft traditions while keeping an eye on new market developments. The company operates as both property developer and executing tradesman, covering a service spectrum that ranges from classic carpentry and joinery work to engineered timber construction and turnkey homes. Its offerings include roof trusses, roof structures, old-building renovation, wooden facades, hall construction, carports, pergolas, garden sheds, terraces, balconies, roof windows and repair work. In building with timber, the company focuses on ecological responsibility: well-considered use of materials, resource conservation through durable solutions, and biological building with harmless materials. As a property developer and construction manager, the GmbH holds the corresponding licences under § 34c GewO and works together with local architects and craft businesses. Upon request, the company offers an all-inclusive carefree package covering organisation from electrical installation to the bathtub.
- Site
- Rettenberg
- Processes
- Timber construction, Renovation, Old-building renovation, Roof construction/roof truss renewal, Timber beam ceiling installation, Roof-top insulation, External thermal insulation composite system (ETICS), Wooden facades
- Materials
- Wood, Mineral wool, Wood fibre board, Plastic windows, Beaver-tail tiles, Plastic (windows)
- Certificates
- § 34c GewO (property developer), § 34c GewO (construction manager)
- Industries
- Timber construction, Construction industry, Residential construction
- 01
Planning and design
- 02
Carpentry and joinery work
- 03
Timber construction / engineered timber construction
- 04
Insulation and external thermal insulation composite system
- 05
Turnkey completion incl. coordination of further trades
Materials and building materials
Wood
Main building material for roof trusses, wooden facades, halls, carports, pergolas and timber structures.
Mineral wool
Insulation material for walls in timber-frame constructions, e.g. in old-building renovations.
Wood fibre board
Applied to the outside of insulation constructions, e.g. 60 mm in roof and wall areas.
Plastic (windows)
Plastic windows with triple glazing for window replacement and renovations.
Beaver-tail tiles
Roof covering material for roof renovations.
Locations
Rettenberg
DEHeadquarters, carpentry business and property developer
- Materials
- Wood, mineral wool, wood fibre board, plastic, beaver-tail tiles
- Telehandler Manitou MRT 2550 (lifting height 25 m, reach 21 m, load capacity max. 5 t)
Structures and structural components
Inside the production
Industries
Processes & technical limits
| Processes | Tolerance | Max. part | Weight | Lot size | Materials |
|---|---|---|---|---|---|
| Timber constructionEngineering | – | – | – | – | Wood, Mineral wool, Wood fibre board |
| RenovationEngineering | – | – | – | – | Wood, Mineral wool, Wood fibre board |
| Old-building renovationEngineering | – | – | – | – | Wood, Mineral wool, Wood fibre board |
| Roof construction/roof truss renewalEngineering | – | – | – | – | Wood, Beaver-tail tiles |
| Timber beam ceiling installationEngineering | – | – | – | – | Wood |
| Roof-top insulationSurface | – | – | – | – | Insulation material |
| External thermal insulation composite system (ETICS)Surface | – | – | – | – | Insulation material |
| Wooden facadesSurface | – | – | – | – | Wood |
| Carport constructionEngineering | – | – | – | – | Wood |
| Pergola constructionEngineering | – | – | – | – | Wood |
| Garden shed constructionEngineering | – | – | – | – | Wood |
| Terrace constructionEngineering | – | – | – | – | Wood |
| Balcony constructionEngineering | – | – | – | – | Wood |
| Timber structureEngineering | – | – | – | – | Wood |
| Joinery workEngineering | – | – | – | – | Wood |
| Engineered timber constructionEngineering | – | – | – | – | Wood |
| Turnkey homesEngineering | – | – | – | – | Wood |
| Window replacementEngineering | – | – | – | – | Plastic |
1 Anlagen & Maschinen
| Machine | Manufacturer / model | Quantity | Working area | Year built | Site |
|---|---|---|---|---|---|
| Telehandler | Manitou MRT 2550 | 1 | – | – | Rettenberg |
Additional services
Quality
The company sees itself as an executing craft business committed to craftsmanship quality and to collaboration with quality-oriented local architects and craft businesses. As a property developer and construction manager, it holds a licence under § 34c GewO (supervisory authority: IHK for Munich and Upper Bavaria).
| Evidence | Rettenberg |
|---|---|
| § 34c GewO (property developer) | |
| § 34c GewO (construction manager) |