Back training at home is the biggest challenge for those training without a gym because most home setups lack pulling equipment. However, a $30-50 doorframe pull-up bar opens up the full range of back exercises and is one of the best investments a home athlete can make. Without one, table rows and backpack rows provide decent alternatives.
For back width (lat development): pull-ups and chin-ups are the primary exercises. Wide-grip pull-ups emphasise the lats more than shoulder-width. Straight-arm lat pulldowns using a resistance band anchored high build the lats with an extended-arm position that isolation machine work mimics. For back thickness (mid-back and trap development): inverted rows under a table or low bar, face pulls with a resistance band, and band pull-aparts all target the often-neglected rear delts and mid-back effectively.
A home back workout structure: pull-ups 4 sets of max reps, inverted rows 3 sets of 12-15, band face pulls 3 sets of 15-20, band pull-aparts 3 sets of 20, and straight-arm band pulldowns 3 sets of 12-15. If you can't do pull-ups yet, use a band-assisted version or progress through Australian rows (body more horizontal) to get strong enough. Train your back twice per week and expect visible width development within 2-3 months of consistent effort.