The multifunctional Sazka Hall in Prague, in the Vysočany neighbourhood, prepared for the World Championship in Ice Hockey, to be held in 2004, is the largest project of its kind in the history of the Czech Republic. In addition to its use to cover the main arena, which will seat almost 17 000 spectators, steel is also used in several other separate constructions. Steel construction forms the load-bearing structure of the ceiling and walls of the circumferal ring around the main hall, and of the cylindrical roof, with a 36m span, which covers the small arena. The load-bearing structures of the mezzanines in the small hall are also of steel. Overall this consists of over 2000 tons of steel constructions.

The ceiling of the Sazka Hall is formed by a dome in the shape of a spherical cap, 135 m in diameter, with a 9.3 m rise. The arena itself is oval shaped, with a rectangular section spanning 98 m, and with two semi-circles at the ends, so that the final span of the construction reaches almost 128 m. The load-bearing structure of the ceiling is founded on the concrete, load-bearing structure of the hall, divided into six dilatation units.

The examples of building reconstruction on the territory of the Prague conservation area that are presented here illustrate the current effort among the majority of investors to increase the capacity of the existing structure, whether through renovations, through additions built onto courtyards that have thus far been empty or at least enclosing the courtyards with ceilings, or through additions built on areas that have been freed up as a result of demolitions of buildings on the courtyards. Investors are also making an effort to maximise the use of the underground areas, which are often entire building plots, newly reconstructed with several underground floor levels.

Karlštejn Castle stands out among Czech castles for its remarkable monumentality. Out of a rocky mass, a perfectly balanced composition of castle buildings takes shape, grading up to the dominant and majestic tower with the Chapel of the Holy Cross. From the functional point of view the castle is composed of two main sections: the inner castle beyond the third gate, with the Marian Tower and the Emperor's Palace, and the separately fortified Great Tower. The outer part of the castle, accessed between the first and second gates, is comprised of the courtyard, which includes the seat of the burgrave and a tower with a deep well.

The castle was built from the middle of the 14th century, by the Czech king, and later Holy Roman Emperor, Charles. Today it is no longer possible to determine the exact, original form of the castle. The oldest vistas, dating from the 18th century, depict the castle in its form after the extensive Renaissance reconstruction (O. Avostalis de Salla) in the years 1578-1599, which was financed by Rudolf II. Later structural modifications affected in particular the seat of the burgrave and partially the Emperor's palace.

The castle's current form stems from restoration work carried out at the turn of the 19th century.

In each family home today, some driving or regulative system can be found. For the most part, this involves an insulated mechanism of a partial technological process or function (central heating, security system, air-conditioning, lighting, shutter controls, sprinkler systems in the garden, etc.) The problem is that each system has its own control system and its own philosophy for controlling the properties and the dialogue that traces the operations of the system, which in the end complicates any effort the manage the entire system by the user.

A family house in Hradec Králové was similarly planned and designed. Once the planned design for controlling heating, the engine room for the pool, and the lighting and shutter controls had been presented, the investor was offered the opportunity to implement the control of the different separate systems and controls as a single, integrated operating system.

In the search for a suitable system, in 1998 two possible versions were considered: a classic control system and a decentralised control system founded on EIB (European Installation Bus) standard electrical installation. After comparing the two, the decentralised system was selected.

Modern methods of laying building foundations enable the reconstruction, completion, and added-on construction of new buildings in the complicated circumstances of the existing town development. An example of how in poorly accessible and cramped conditions it is possible to succeed in laying untypical foundations and a deepening of the existing underground levels in a courtyard building area is the reconstruction and completion of the neo-renaissance building dating from the end of the 19^th century and located on Senovážné square in Prague.