Architecture office in Siegen for residential construction, commercial buildings, renovation of existing buildings and urban planning concepts

infra plan gmbh

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About infra plan

infra plan gmbh is an architecture office based at Spandauer Str. 36 in Siegen. The office provides architectural services in the areas of residential and residential building construction, new-build planning as well as renovation of existing buildings, and develops urban planning concepts, including for the repurposing of brownfield industrial sites. Services include floor plan design, elevations, 3D modelling and visualisation. Clients include Wohnungsbau Gesellschaft Südwestfalen e.G., KSG Siegen as developer of subsidised housing, the project development company „Alte Filzfablik“, as well as the town of Hilchenbach and the Siegen-Wittgenstein district. Completed and ongoing projects include renovations of residential buildings on Obenstruthstraße in Siegen, an administrative centre in Kreuztal for the Social Welfare Office, Jobcenter and District Craftsmen's Association, and three residential buildings with 35 housing units as subsidised housing on the site of the former felt factory in Hilchenbach-Allenbach, whose groundbreaking ceremony took place on 29.07.2025.

Site: Siegen
Processes: Architectural services, Renovation of existing buildings, New-build planning, Urban development concepts, 3D modelling and visualisation
Materials: Timber construction, District heating network
Certificates: 3D modelling and visualisation, Site plans, floor plans, sections and elevations
Industries: Residential construction, Commercial buildings/administrative buildings, Public construction, Urban planning

01
Site survey and design
02
3D modelling and visualisation
03
Planning and approval
04
Construction supervision through to completion

Services and Planning Methods

HOLZ

Timber construction

Used in the multi-storey extension of a law office building from the 1st upper floor upwards.

NAHWAERME

District heating network

Planned energy supply for the Alte Filzfabrik residential area in Hilchenbach-Allenbach.

Location

Siegen

Office/Architecture office

Projects

**Residential building Obenstruthstraße, renovation of existing building**Renovation of existing building · Residential construction

**Residential buildings Hilchenbach-Allenbach**New-build planning · Subsidised housing

**Residential building B Siegen**New build · Residential construction

**Law office extension on Rosterberg**Renovation of existing building · Commercial building

**Administrative centre Kreuztal**New build · Public building

Inside the production

Three residential buildings with 35 housing units, Hilchenbach-Allenbach

Alte Filzfablik site before demolition, view from the Breitenbach dam

Site plan with floor plan, modular houses Wilnsdorf-Oberdielfen

Model at scale 1/100, modular houses Oberdielfen

Floor plan 1st upper floor, law office extension

Office extension with view over the town

Groundbreaking ceremony Hilchenbach-Allenbach on 29.07.2025

Office renovation Spandauer Str. 36, corridor area

Industries

Residential constructionCommercial buildings/administrative buildingsPublic constructionUrban planning

Additional services

Architectural servicesRenovation of existing buildingsNew-build planningUrban development concepts3D modelling and visualisation

Reference customers

Wohnungsbau Gesellschaft Südwestfalen e.G.KSG SiegenProject development company „Alte Filzfablik“ (Hilchenbach)Town of HilchenbachSiegen-Wittgenstein district (administrative centre Kreuztal)

Quality

Planning quality is ensured through floor plan variants, sections, elevations as well as 3D models at a scale of 1/100 and visualisations.

Evidence	Siegen
3D modelling and visualisation
Site plans, floor plans, sections and elevations

History

2008
Project: renovation of residential buildings on Obenstruthstraße for Wohnungsbau Gesellschaft Südwestfalen e.G.
2025
Renovation of the company's own office at Spandauer Str. 36 in Siegen.
2025
Completion of the new administrative centre in Kreuztal planned for June 2025.
2025
Groundbreaking ceremony on 29.07.2025 for three residential buildings with 35 housing units in Hilchenbach-Allenbach, client KSG Siegen.