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It depends on size, span and site conditions; the definitive schedule is confirmed in writing after the survey and structural design. The advantage of steel is that the frame is fabricated in the workshop and erected on site: there is no formwork, rebar or concrete curing to wait for, so the site programme is shorter than conventional methods and far less exposed to weather.

Steel is ductile: in an earthquake it deforms and absorbs energy instead of failing brittly. A steel frame is also lighter than an equivalent concrete structure, and lower mass means lower seismic forces. Performance is decided by the calculation as much as the material: every project gets a load analysis (snow, wind, seismic), with sections and connections sized to the current code.

In most cases yes, and steel is the right system for it because the addition puts the least possible load on the existing structure. The decision still depends on the capacity of the existing frame and on the ground: the existing project and building are assessed first, then the added load is calculated. We give no commitment before that assessment. Our 2.5-storey steel addition over a concrete building in İzmir Menderes is an example of this work.

Not quite. “Prefab” describes parts produced in a factory or workshop rather than on site; steel construction means the load-bearing system is built from steel sections. In most projects the two run together: the frame is fabricated in the workshop, while insulated prefabricated panels are used for façade and roof. At survey stage we also clarify whether heavy steel (industrial buildings, long spans) or light-gauge steel (housing, added storeys) suits your project.

Comfort comes from the façade and roof build-up, not from the frame. Insulated sandwich panels, mineral wool or EPS cores, plasterboard linings and correctly detailed junctions deliver the thermal and acoustic performance; potential thermal bridges are resolved in the design. Insulation thickness is selected according to the intended use and the climate zone.

Unprotected steel corrodes, which is why surface protection is an integral part of fabrication. Depending on exposure we apply hot-dip galvanising, or blast cleaning followed by a primer and topcoat system. In demanding environments — coastal, humid or industrial atmospheres — the protection class is raised accordingly.

Permanent buildings follow the permit process: architectural, structural, mechanical and electrical projects are submitted to the relevant municipality. We prepare the structural calculations and steel shop drawings and guide you through the permit process. Zoning status and plot conditions are checked from the outset — we do not quote for a building that does not comply with regulation.

The main drivers are covered area and number of storeys, the column-free span required, floor height, the loads on the frame (snow, wind, seismic, plus any crane or suspended-ceiling loads), the façade and roof system chosen, and the surface protection class. Any figure given before these are settled would be unrealistic; we prepare an itemised quote after the survey.