Construction 102

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Across
  1. 3. (Clue: Material covering the top of the building)
  2. 4. (Clue: Front exterior of the building)
  3. 7. (Clue: The outdoor surroundings of the building)
  4. 12. (Clue: Material to regulate temperature)
  5. 13. (Clue: A set of steps connecting levels)
  6. 16. (Clue: The process of improving and updating)
  7. 17. Dock (Clue: Area for receiving and shipping goods)
  8. 18. (Clue: A material used for wall finishing)
  9. 19. (Clue: A legally binding agreement)
  10. 20. (Clue: System of pipes for water and sewage)
Down
  1. 1. (Clue: The process of providing fresh air)
  2. 2. (Clue: Dining area within the store)
  3. 5. (Clue: Vertical transport device between floors)
  4. 6. (Clue: A roof-like structure for shade)
  5. 8. (Clue: Structural skeleton of the building)
  6. 9. (Clue: Architect's detailed plans for construction)
  7. 10. (Clue: Facility for personal hygiene)
  8. 11. (Clue: Official authorization for construction work)
  9. 14. (Clue: Architect's detailed plans for construction)
  10. 15. (Clue: Covering surfaces with ceramic or stone)