10 steps in housebuilding

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Across
  1. 7. the house is built on top of this
  2. 10. you can see it from the outside
  3. 11. helps you step by step
  4. 12. where all the water goes
  5. 13. you can see it from the inside
  6. 14. is installed after insulation
  7. 15. these wires make all the lights and machines work
  8. 16. keeps your house warm
Down
  1. 1. if you have the homekeys who are you?
  2. 2. you walk on it
  3. 3. comes after the building process is done
  4. 4. it keeps your building steady and upright
  5. 5. keeps your house working
  6. 6. if something breaks this helps
  7. 8. stonelike material used commonly in buildings
  8. 9. something you need to do before you start building