The best replacement for attic is loft.

The best alternatives to attic are rated as following:
★★★★★  loft
★★★★  basement
★★★★  roof antenna
★★  loft difference
★★  loft english
★★  garret
★  attic
★  crawl space
★  koine
★  asiatic
★  no attic
★  unvented attic
  vaulted ceiling
  walls insulation
  cathedral ceiling
  cockloft
  shelve

Your alternative for attic is not listed? Suggest!
Speaking about attic, one probably shouldn't forget about trusses.

Other search terms related to attic and their ratings are:
★★★★★ trusses
★★★ low ceiling
★★★ no ventilation
★★ ventilation
vaulted ceiling
insulation
venting
You have in mind a companion for attic and it is not yet here? Propose!



Google Trends

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attic
loft
basement