baulich
structural
Relating to construction, buildings, or architecture.
Das alte Haus hat einige bauliche Mängel.
The old house has several structural defects.

structural
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structural
Relating to construction, buildings, or architecture.
Das alte Haus hat einige bauliche Mängel.
The old house has several structural defects.

The adjective 'baulich' is derived from the noun 'der Bau' (the building, the construction). The ending '-lich' means 'in the manner of' or 'relating to'. So 'baulich' means 'relating to construction'.
Die Stadt plant neue bauliche Projekte am Flussufer.
The city is planning new construction projects along the riverbank.
'Baulich' is almost always combined with nouns that have to do with buildings or construction. Common combinations are 'bauliche Mängel' (structural defects), 'bauliche Veränderungen' (structural changes), 'bauliche Maßnahmen' (construction measures), and 'der bauliche Zustand' (the structural condition).
Vor dem Kauf der Wohnung sollten Sie den baulichen Zustand prüfen lassen.
Before buying the apartment, you should have its structural condition checked.
This adjective belongs more to technical and official language. It is often found in texts about architecture, real estate, expert reports, or official documents.
Das Gutachten listet alle baulichen Mängel des Gebäudes auf.
The expert report lists all the building's structural defects.
constructive
'konstruktiv' and 'baulich' can both have to do with building or structure. 'baulich' clearly refers to buildings, construction work, or architecture. In this technical sense, 'konstruktiv' is used more in specialist language and means relating to the structure or construction of something. In everyday language, however, 'konstruktiv' usually means helpful and solution-oriented. The words can be confused because 'konstruktiv' brings 'Konstruktion' (construction) to mind. When the topic is specifically a house, a renovation, or the condition of a building, 'baulich' is more natural. When the topic is the technical structure or helpful criticism, 'konstruktiv' fits.

Das alte Schulhaus braucht mehrere bauliche Veränderungen.
The old school building needs several structural changes.
Der Ingenieur prüft die konstruktiven Details der Brücke.
The engineer checks the structural details of the bridge.