The former is part of civil law. These are primarily contracts between the client / client and the respective contractors, planners and craft enterprises, such as contracts, construction contracts, consumer construction contracts, architect and engineer contracts, developer contracts, etc. In addition, but also the right to property and the neighboring right to private Building law in the broader sense.
In contrast, public construction law is part of public law. It includes those public-law regulations that deal with construction projects. Within public building law, in turn, the building planning law - "Where may be built?" - and the building code - "How may / must be built?" - distinguish.
Typical topics of construction planning law are, for example, land use plans, development plans, admissibility of projects in the interior (§ 34 BauGB), building in the outdoor area (§ 35 BauGB), mutual agreement, etc.
In the building regulations are among other things "nightmares" such as building attitude (kind 75 Bavarian building regulations), disposal order (kind 76 S. 1 Bavarian building regulations) and use prohibition (kind 76 S. 2 Bavarian building regulation).