3. Figure out how you’re going to stay alive on the island.
Once you have a rough idea of how often you’ll be using the island and how many people will be with you, you’ll have to determine how you’re going to get water and electricity. Most of the time, Kulig says, maintaining a water supply entails a combination of water collection and reverse-osmosis facilities.

“Water collection’s not a big deal,” he says. “You’re going to collect whatever’s available, and then let’s say you’ve got a small osmosis plant that’s slowly producing water all the time—let’s say it makes 5,000 gallons a month, and you visit only three times a year; you’ll have all the water you’d ever need.”
To power that energy-intensive reverse-osmosis facility, you’ll need solar panels and equipment to store that power (or run an underwater cable from the nearest power source), and to deal with water once you’ve used it, you’ll need some sort of wastewater treatment/recycling facility (you presumably want your crystal-clear ocean to stay that way), which in turn requires even more energy.

Unsurprisingly, these facilities represent a significant up-front cost, although Kulig is hesitant to say how much. (He estimates “low hundreds of thousands of dollars” for the water treatment and collection and says that solar panels are getting so cheap, so fast, that he doesn’t want to guess what it would cost a year down the line.)

4. Figure out how you’re going to get everything out there.
Luckily, this isn’t really up to you—it’s up to whichever local contractor you’ve hired to help organize construction. (“We can’t just parachute in and know all the answers,” Kulig says. “We pair with local groups.”) But if you’re trying to budget it out (see: No. 5), you should try to get a general sense of whether materials will be getting to the island via barge or, if there’s not an extant dock or if a channel needs to be dredged before boats can reach the island, by plane. “We did huge projects in Haiti where there were no docks,” says Kulig. “We just landed planes on the beach and dragged the supplies off with a tractor.”

5. Do a budget.
Kulig can’t give an estimate for how much it would cost to get an island up and running, he says. “It could be around $250 to $350 a square foot for the house” in Belize, he says, “but that’s just raw construction. It doesn’t include solar, or water, or docks, or landscape, or whether or not you’d want to pay for a five-ton air conditioning unit.” Could you build a reasonably comfortable, self-sustainable house for less than $1 million? “Absolutely not,” Kulig says.

6. Figure out how to make it pleasant.
Back to the fun stuff: You’ve already got a rough sense of what your aesthetic is going to be (see: No. 2), but you actually have to furnish it. In the city, a decorator is a luxury, but for a remote island, where you’ll have to determine which furniture weathers best, which fabrics are more prone to rot, and which finishes deal better with humidity, an interior architect or decorator is closer to a necessity. “People might bring in their design architect from New York to do the house, and she might then call a local architect for help,” Kulig says.
 
7. Wait (and wait).
Because this is, after all, a remote island, everything takes longer. “Figure two to three years,” Kulig says. “People might promise you a shorter period, but that’s not taking into account that after you hire a contractor, they have to mobilize people and get their materials in order.”

8. Move in.
It’s that simple. (After the years of logistics and millions of dollars, that is.)

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