A pool house gives swimmers a dry place to change, a shaded spot to rest, and a home for floats, towels, and chemicals that would otherwise clutter the patio. Designs range from a converted garage to a finished guest suite with a kitchen and an office, and the best version of any of them responds to the main house, the yard, and the way the pool actually gets used. The full planning path, from siting to finishes, is laid out in our designing a charming pool house guide.
Every pool house shares the same core program: a place to store gear, a place to change, and a place to sit. How much space each function gets, and how the building is finished, separates a utilitarian shed from a backyard destination.
Planning the Pool House: Purpose, Siting, and Size
The planning phase settles the questions that every later decision depends on. Work through the sequence below in order, and the design falls into place without rework.
- List the activities the building must support, ranked by how often each happens.
- Walk the yard and mark two candidate locations, checking utilities and sightlines.
- Set a budget that includes a 15 percent contingency for surprises.
- Choose the style and sketch a floor plan at quarter-inch scale.
- Confirm the design with the local building department before ordering materials.
Define the Primary Function
Write down the three activities the building must support. A changing-and-storage pool house needs a shower, a toilet, and lockers, and can be as small as 120 square feet. A pool house that doubles as a guest suite or home office needs 400 square feet or more, plus HVAC and a kitchenette. The function list drives the floor plan, so it belongs on paper before any framing.
Siting and Orientation
Place the building close enough to the pool that wet swimmers do not cross long expanses of lawn, but far enough that the structure does not crowd the water’s edge or block sightlines from the house. Orient windows and doors for afternoon shade in hot climates and winter sun where the season is short, and keep utility runs short: water, power, and drainage all cost less when the building sits near existing services.
Budget and Phasing
Pool house construction typically runs $100 to $300 per square foot depending on finishes and whether the building includes plumbing. If the budget will not stretch to a finished interior, phase the work: build the shell and the wet walls first, then finish the interior when funds allow.
Wet areas deserve the same rigor that commercial builders apply to public pools. Our aquatic center material specifications article documents the waterproofing systems and pool finishes used in community facilities, and the same principles, continuous waterproof membranes, sloped floors, and drainage, apply at backyard scale.
Architectural Styles and Exteriors
The exterior sets the tone for the whole backyard. Three directions cover most projects, and each can be scaled to a small shed or a large pavilion.
Modern and Minimalist
A black-painted pool house reads as sleek and recedes into the landscape at dusk. Clean rectilinear forms, large glass openings, and a restrained material palette of dark siding, metal roof, and concrete keep the building quiet while the pool does the talking. Deep charcoal and matte black finishes also hide the water spotting that comes with pool splash.
Farmhouse and Rustic
Dark green paint with bright white trim, a cupola or weathervane, and board-and-batten siding give a pool house the character of a rural outbuilding. The style suits properties with existing outbuildings, horse pastures, or garden structures, and it hides dust and pollen better than light finishes.
Matching the Main House
Repeat the main house roofline pitch, siding material, or trim color on the pool house and the two buildings read as one composition. The connection matters most from the pool, so stand at the water and check the sightline before you lock in the finish schedule.
A comfortable pool house does not have to be an energy hog. The passive house podcast episode with Bronwyn Barry explores how high-performance building envelopes cut heating and cooling loads in small structures, a lesson that applies directly to a pool house that runs only part of the year.
Interior Layouts and Functional Zones
Divide the interior into zones and give each one a clear boundary. A typical 250-square-foot pool house fits three zones comfortably.
- Keep the changing area between the pool entry and the living zone
- Place the wet bar near an exterior wall to shorten plumbing runs
- Put storage on the pool side so gear is grabbed on the way out
Storage and Utility Zones
Lockers or open shelving handle towels, floats, and cleaning supplies. A small utility closet with a floor drain holds the water heater and the pool chemical station, keeping both out of reach of children and out of sight of guests.
Living and Entertaining Zones
A wet bar with a small refrigerator, a counter, and a sink turns the pool house into the summer kitchen. Add a dining counter or lounge seating and the building becomes the social center of the yard, especially when a pass-through window connects the bar to the pool deck.
Bathroom and Changing Areas
The changing area needs three things: a shower with a bench, a toilet, and hooks or cubbies. Use porcelain tile on the floor and walls, a sloped floor to the drain, and a vent fan sized for the room so humidity does not settle into the framing.
Color does the heavy lifting in a small room. The transformation of a 1907 farmhouse in our colorful whole-house remodel story shows how paint and precise detailing can carry a design, and the same logic applies to a pool house interior: pick a palette early and commit to it.
Construction Materials and Systems
Pool houses live in a high-moisture environment, so material choices skew toward what survives humidity, chlorine, and wet feet.
Structure and Envelope
Wood framing with pressure-treated bottom plates, or a masonry base in flood-prone yards, forms the structure. The envelope needs a continuous vapor barrier on the interior, vented soffits, and moisture-resistant sheathing, because a pool house that sits unused for months can trap humidity and grow mold. Insulate the walls and ceiling to the same standard as the main house, and install a dehumidistat-controlled exhaust fan that runs automatically when humidity climbs.
| System | Recommended Choice | Why |
|---|---|---|
| Flooring | Porcelain tile with drainage slope | Resists water, easy to clean |
| Wall finish | Cement board with tile or moisture-resistant drywall | Withstands humidity and splashes |
| Ceiling | Ventilated, moisture-resistant | Prevents condensation and mold |
| Lighting | Wet-rated fixtures near the pool side | Safe around water |
Plumbing, Electrical, and HVAC
A small tankless water heater serves the shower without a bulky tank. All outlets near the pool side need GFCI protection, and the pool house should have its own breaker at the main panel. A mini-split heat pump heats and cools the space efficiently, and a bath fan exhausts shower humidity.
For larger pool houses, the construction strategies behind a modern barn style house, open trusses, loft storage, and simple gable forms, translate directly and keep the building economical.
Finishes, Colors, and Indoor-Outdoor Connection
Paint and Exterior Finishes
Dark exteriors hide pool splashes and sunscreen residue better than light paint. Whatever the color, specify exterior-grade paint with a mildewcide additive, and extend the same finish to the trim, the door, and the fascia so the building reads as one piece. Exterior color selection changes how the structure sits in the landscape, and the house exterior painting guide from Build-Review walks through color ideas and the practical steps of getting the job done.
Windows, Doors, and Views
Large sliding or folding glass doors open the pool house to the deck and turn the interior into shaded porch space. Transom windows above the door line bring light deep into the room while keeping walls free for storage, and a pass-through window at bar height keeps the host inside and the guests outside.
The barn-inspired pool house owes much of its appeal to projects like the modern barnhouse vision Colin Oglesbay developed for the 2021 This Old House Idea House, which showed how a simple gable form can carry a whole design.
Window selection shapes both the look and the comfort of a pool house. The farmhouse window selection case study from the same Idea House project shows how choosing the right units tied the whole structure together, and the same care with glass, trim, and orientation will make your pool house feel finished from every angle.