Pool House

A pool house is a detached building beside an outdoor pool that keeps the mess of swimming out of the main house. The classic one holds a changing area, a bathroom with a shower, and storage for floats, towels, and the pump chemicals, and bigger versions add a lounge, a kitchenette, a wet bar, or room for a game room beside the water. It is a permanent, weathertight structure, distinct from the open post-and-beam pavilion and from the half-wall cabana that shades a lounge chair.

The practical payoff is that wet feet, chlorine, and sunscreen never cross the kitchen threshold. Guests change at the pool, use the bathroom without trailing water through the house, and the stack of pool toys lives where it is used instead of on the patio. That convenience is also why the room converts: a dry, enclosed space at the back of the yard is a short walk from a backyard shed and an outbuilding in permitting terms, and many owners end up finishing it as a bar, a theater, or a quiet retreat that has nothing to do with the pool by winter.

A pool house is not a guest house, and the boundary is legal rather than stylistic. A structure with a full kitchen and a bedroom stops being an accessory building and starts being an accessory dwelling unit in most codes, with bigger setbacks, stricter permits, and different property tax treatment. It is also not a cabana, which is open or semi-enclosed and typically lacks a bathroom. Get the classification right before the slab is poured, because it changes what you can build and what it costs.

Building one: attached, standalone, or prefab

Pool houses split into three build paths. A pool shed is the smallest, often 25 to 100 square feet, just enough for a changing screen and equipment storage, and the cheapest at roughly $1,000 to $15,000 depending on finish. A custom pool house runs $45,000 to $180,000 for a 300 square foot structure, or $150 to $600 per square foot, with the average project landing near $72,000. A prefab kit costs $7,500 to $45,000 installed and ships in factory-built panels, which trades layout freedom for a faster, flatter budget.

The biggest cost driver is plumbing. Running water to a bath pushes a project $18,000 to $50,000 higher than a dry build, because the trench, the supply line, and the waste line to the septic or sewer all add up, and the same shell math shows up in the room conversions covered on this site. Most jurisdictions require a building permit for a pool house, and if it gains a kitchen it may be reclassified as an accessory dwelling unit under local rules, so check setbacks and the size limits before designing around a specific square footage.

Attached versus detached changes the cost and the permitting. A pool house attached to the main structure rides on the home's existing foundation and roof lines, which can cut site work but extends the building envelope, while a detached building is a cleaner project with its own slab and its own permit path. Many owners convert an existing structure instead, finishing part of a garage or an outbuilding, which keeps the shell cost out of the budget and lands as a remodel rather than new construction.

Pool house versus cabana

The one-line distinction is that a cabana is open to the air and a pool house is not. A cabana is a roof over a lounge area, maybe two or three walls, a ceiling fan, and power for lights, with no bathroom and no insulation, and it runs $15,000 to $80,000 depending on how much of it gets enclosed. A pool house is a fully enclosed, often climate-controlled building with a bathroom, which is why it starts where a cabana tops out.

Choose by what the room does in winter. A cabana is a summer shade structure that sits empty when the pool closes, while a pool house with heat or a mini-split keeps working as a home bar, an office, or a game room year round. If the goal is purely poolside lounging, a cabana is cheaper; if the structure has to earn its square footage in the off season, the pool house wins, and that dual use is why a well-built one returns more of its cost at resale.

Where the pool house came from

The ancestry runs through Roman bathhouses, where changing rooms and lounges surrounded the pools, and the word cabana descends from the Latin capanna, a little hut used as a poolside dressing room. The pool house as an American fixture arrived with the private pool in the 1930s and 1940s, when Hollywood stars built swimming pools and a separate building for changing, entertaining, and relaxing, and the style read as glamour for decades after.

The meaning broadened as pools went suburban. What began as a changing hut became a multi-purpose building that stores the pump, houses a bathroom, and doubles as a guest room or a bar, and today the term covers everything from a 25 square foot equipment shed to a 400 square foot retreat with its own HVAC. The trajectory is the same one the man cave followed: a niche luxury that became an ordinary backyard option.

The modern expansion is the prefab kit. Factory-built panels and modular shells put a pool house within reach of a normal backyard budget, and the ready-made cabana kits sold by outdoor-living companies now dominate the low end of the market. The trade-off is the same as any kit build: faster, flatter pricing, and fewer options to customize the layout.

Common mistakes

Treating it as a storage shed with a nicer name is the first. Skip the bathroom and the structure becomes a glorified equipment closet that guests never use, which is how pool house budgets evaporate with no payoff. If a bathroom is out of reach, at least plan the plumbing rough-in while the trench is open.

Overbuilding past the permit line is the second. Adding a full kitchen quietly turns a pool house into an accessory dwelling unit, which can mean new setbacks, parking requirements, and tax treatment, and builders who discover that mid-project pay for it twice. Design to the classification on purpose, not by accident.

Forgetting that the space gets wet is the third. Moisture, chlorine, and sunscreen wreck drywall and standard flooring, so specify tile, waterproof finishes, and ventilation from the start, the same moisture logic that governs a man cave in a basement. A pool house that smells like mildew by year two was planned for the wrong climate.