Start by measuring the actual usable space, not the full slab or balcony width. I sketch a quick bird’s-eye view, then use a tape measure or laser measure to record the longest and shortest length and width, plus any recesses, columns, railings, planters, or AC units. Urban spaces are rarely perfectly square, so take measurements at three points across each dimension and write down the smallest usable number. That’s the number that matters when you’re trying to make patio furniture fit.
Next, don’t forget the delivery path. Measure doorways, gates, stairwells, elevator interiors, hallway turns, and the tightest corner between the entrance and the patio. A loveseat can fit on the balcony and still be impossible to get there. Note whether furniture arrives assembled or flat-pack, and measure the package too. This is especially important for urban outdoor furniture, where access is often tighter than the space itself.
On your sketch, draw furniture footprints with painter’s tape or paper templates. Use actual outdoor furniture dimensions—overall width and depth, seat height, table overhang, and the full length of a reclined chaise. Leave walking clearance: about 24–36 inches for main paths, 18–24 inches between a sofa and coffee table, and 24–30 inches around a dining table for chair pull-out. For a small balcony layout, modular, folding, or stackable pieces can make the difference between cramped and comfortable.
Check vertical clearance for umbrellas, pergolas, hanging planters, and tall planters. Measure railing height and any overhead structures. Also note sun, wind, drains, outlets, and hose access, because these can change where furniture can sit. If you rent, check balcony load rules and landlord or HOA restrictions before buying. A quick call now can save a return later.
Finally, mock up the layout for a day or two. Walk through the routes, open doors, pull out chairs, and make sure you can water plants and clean. Take photos with measurements marked; they save time when comparing products. Buy only after the furniture footprint plus clearances fits the smallest usable dimension, not just the ideal one. That’s how I measure outdoor space so the furniture actually works in real life, not just on a product page.