Visualisation

Feasibility Study Felsenburg

Feasibility Study Felsenburg

Architect

Studio Wirz

Client

SISKA Immobilien AG

location

Frauenfeld

Dates

2025 – 2026

2025 – 2026

Starting point

The residential and commercial building had vacancies. At the same time, reliable information about the building was missing: drawings were out of date, service routes were not documented and the structural condition was only partly known.

There had also been moisture damage in the plinth and ramp area for some time, the cause of which had not been established. This left no basis for deciding on the future development of the property, either technically or economically.

Existing building

What emerged

As part of the feasibility study, the existing building was surveyed systematically, digitised and technically assessed. Working with specialist firms and in dialogue with the authorities, the structural, technical and legal constraints were clarified.

The causes of the moisture damage were located and specific refurbishment options developed. The service routes were analysed and the condition of the relevant building elements assessed.

Use and floor plan options were developed for all vacant units, to create attractive spaces that are easy to let. A rough cost estimate (±30%) with a timeframe was also prepared, making the investment required, the priorities and the phasing transparent.

Existing building
Visualisation
Visualisation

What remains

For the first time, the study provides a reliable basis on the structural condition, the risks and the development options of the property. It supports well-founded strategic decisions and a step-by-step further development of the building.

My scope

My scope

SIA phase 21: feasibility study

Analysis of the structural and technical condition of the existing building

Digitisation and reconstruction of missing records

Site visits with specialist firms and preliminary discussions with the authorities

Development of use and floor plan options

Development of refurbishment strategies

Preparation of a rough cost estimate (±30%)

Scheduling and definition of the next steps

ALL IMAGES

Existing building
Existing building
Existing building
Existing building
Visualisation
Visualisation
Existing building

Photos: Studio Wirz unless stated otherwise

© 2026 Studio Wirz

Photos: Studio Wirz unless stated otherwise

© 2026 Studio Wirz

Photos: Studio Wirz unless stated otherwise

© 2026 Studio Wirz