Every boat lift decision on the Gulf Coast starts with the same four numbers: dry weight of the boat, water depth at mean low tide, beam of the hull at its widest point, and the lift footprint your dock and bulkhead can physically anchor to. A lift that is undersized on any one of those numbers will shorten the life of the cradle, the cables, the winch, and the bulkhead behind it. A lift that is oversized on the wrong number will move money out of the budget that should have been spent on the dock reinforcement the lift actually sits on. The job of this post is to give an owner the language to read those numbers off their own shoreline, and to know when the conversation has crossed out of DIY sizing and into the matched marine-contractor scope at /services/boat-lift-installation.
Weight capacity is the first number and the most often misread. Manufacturers rate a lift by the boat's wet weight at the waterline — fuel in, gear aboard, the kind of load the lift actually carries on a Sunday — and Gulf Coast owners should size to the next standard capacity tier above that number, never below, because a tropical storm will load the boat with rainwater and a partial load of seawater if the lift fails to winch all the way clear of a surge. PWC lifts run in the 1,000–1,500 lb class; single-slip lifts for bay boats and flats boats run 5,000–10,000 lb; center-console lifts run 10,000–20,000 lb; and the lift a 30-plus-foot coastal cruiser lives on is in a different conversation entirely. Underbuy on capacity and you shorten the cable life every season and force the motor to work harder than it was specced for; overbuy by a tier or two and you spend money on a stronger cradle than the hull actually needs.
Water depth and tide swing decide the lift type as much as the boat does. A fixed cradle lift (the standard four-post aluminum lift with a cable-driven cradle) wants enough water at mean low tide for the hull to float into position without grounding the cradle on a sandbar — anything less than two feet of under-keel clearance at low tide and the lift is unusable for half of every tidal cycle. A hydraulic lift runs the cradle on a hydraulic cylinder rather than a cable and handles deeper water and heavier loads more cleanly, but the hydraulic power pack above the dock wants a weather-tight enclosure and a marine-grade pump, both of which add to the install. A floating lift rides on its own pontoon and works in shallow, soft-bottom, or low-tide harbor locations where a fixed cradle cannot stay afloat — the right answer for a shallow canal or a bank that silts in every summer, but the wrong answer for any shoreline that sees a chop. The pick is water-first, hull-second, lift-third.
Anchoring is the conversation that almost always decides whether the install is a job for the matched crew or a Saturday project with a rented post driver. A lift that sits on an existing timber bulkhead cap has to land on a cap that can carry the static load plus the dynamic storm load plus the pry-bar load if a strong tide tries to lift the cradle out of the posts; a lift that sits on a free-standing piling cluster has to be drilled and set into substrate the crew has actually probed, not assumed. Our boat-lift-installation crew (matched at /services/boat-lift-installation) handles the spec, the pile work, the cradle-to-dock tie, and the wiring for an electric or solar drive; the conversation they have with an owner starts with the four numbers in this post and ends with a lift that the bulkhead, the dock, and the shoreline can all live with. Send a photo of your hull, a number off the cap, and the depth at mean low tide, and the matched scope is one conversation away.
Put the four numbers on a notecard the same weekend you walk the bulkhead and the dock: dry weight, beam at the widest point, depth at mean low tide, and the lift footprint your cap or pile cluster can actually anchor to. If any of those four numbers makes you pause — a wet weight you are not sure of, a depth you have not measured at low tide, a cap that has not been probed since the last storm — send the photo and the one-line note through the form on the home page and we will tell you which side of the DIY line it falls on. The goal is to choose once, choose well, and have a lift that the bulkhead and the dock can live with through every season.