Spa Construction in Kansas City, MO

Hot Water That Belongs to the Backyard

A portable hot tub parked on a patio slab never quite looks like it belongs there. KC Pool and Spa builds in-ground spas and spillover spas through Kansas City, MO, and out to Raymore, Missouri, Lake Lotawana, Missouri, and Mission, Kansas, with spa construction that ties shell, jets, seating and heating into the landscape. Comfort in a spa is decided by geometry, so we set bench heights, backrest angles and jet placement around the people who will actually use it rather than a catalog layout. Our family-owned team has been building gunite spas since 2012, we hold a general contractor license, carry full insurance, and cover materials and workmanship under a 2-year warranty. Standalone spas and spas that spill into an existing pool follow different plumbing paths, and we work through that decision with you early. Send your yard dimensions and photos through our contact page to start the design conversation.

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For the fastest reply, call or text us 24/7 at

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Spas We Design and Build

In-Ground Spa Builds

Steel-reinforced gunite shells are formed, shot and cured on site, which allows any footprint the yard will take. Excavation, plumbing, electrical rough-in and interior finish follow the same sequence as a pool build, compressed into a much smaller structure.


Spillover Spa Design

Raising a spa above the waterline and letting it overflow into the pool gives you sound, movement and a visual anchor at one end. Shared plumbing lets a single equipment pad run both bodies of water on separate temperature settings.


Custom Seating Layouts

Bench depth, lumbar curve and footwell placement decide whether people stay 10 minutes or an hour. We shape loungers, cool-down seats and corner benches to the heights of the household, then position handrails and steps for easy entry in the dark.


Hydrotherapy Jet Systems

Jets only work when aimed at the right muscle with the right pressure. Placement is planned seat by seat, mixing wide-flow, rotating and pinpoint nozzles, with dedicated blower and booster plumbing sized so no seat loses pressure when others run.


Spa Heating Systems

Getting to 102 degrees quickly takes a heater matched to volume, not one borrowed from the pool circuit. Gas heaters, heat pumps and insulated shells are specified together, along with a fitted cover that holds temperature between soaks through winter.


Automation and Controls

Nobody wants to walk outside twice on a cold night. Controls that heat the spa from a phone, switch valves automatically, dim the lights and run jets on a schedule turn a 40-minute warm-up into something you start from indoors.

    How a Custom Spa Enhances Outdoor Living

    Year-Round Use of the Backyard

    Cold months shut most backyards down completely. Heated water in an in-ground spa keeps the space in use through January, when 104-degree water and a clear night sky become the reason people go outside instead of staying in for the evening.

    Relief Where You Actually Need It

    Generic jet placement hits the wrong spots and misses the ones that ache. Seats designed around your height and the trouble areas you actually have put pressure on the lower back, shoulders and calves where it does some good.

    A Feature That Looks Original to the House

    Prefabricated tubs sitting on a slab always read as an appliance in the yard. Building the spa into grade with matching coping, stone and decking makes it look like it went in with the house, which is what raises property appeal.

    One Pad Running Both Temperatures

    Sharing filtration, heating and control gear between spa and pool avoids a second set of everything. You run the pool cool for swimming and the spa hot for soaking, from one panel, without doubling the equipment on the pad.

    Nothing to Replace in 10 Years

    Portable tubs wear out, crack and get hauled away, usually within 10 years of purchase. Concrete shells with tile and replaceable jet internals stay serviceable for 30 years or more, so the money goes into the property once instead of repeatedly.

    Room for the Whole Household

    Standard tubs seat four people awkwardly and force everyone to take turns. Sizing the shell to your household, whether that means six adults or a bench long enough to lie flat, means nobody sits out on a Friday evening.

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    Hot Water Worth Walking Out To

    Spas get used far more often than pools do, which is why the details of seating and jet placement matter more than the square footage. KC Pool and Spa builds them in Kansas City, MO, as permanent structures, engineered for the freeze and thaw cycles this region puts on concrete and plumbing every winter. Whether you want a quiet corner soak or a spillover tied into the pool you already have, the design starts with how you plan to use it and works backward from there. Take whatever time you need to think it through, then send your yard details through our quote form when you want to talk options.
    Frequently Asked Questions

    How long does it take to build an in-ground spa?

    Freestanding gunite spas typically take 4 to 6 weeks from excavation to first soak, since the shell has to cure before finish work begins. KC Pool and Spa schedules spa builds across Kansas City, MO, so curing is not rushed.


    What is a spillover spa?

    A spillover spa sits raised beside or inside a pool and cascades warm water over its edge into the main body. The two share equipment while holding different temperatures, and the falling water doubles as a feature when the spa is off.


    Can a spa be added to an existing pool?

    Yes, and it is a common renovation. Its own shell gets tied into the pool structure, with new plumbing runs, a dedicated heater circuit and valve actuators added so one equipment pad can serve both bodies of water at once.


    How many jets does an in-ground spa need?

    Small two-person spas run well with 6 to 8 jets, while a six-seat design usually calls for 20 to 30. Count matters less than pump sizing, since too many jets on an undersized pump leaves every seat feeling weak and disappointing.


    Can an in-ground spa be used in winter?

    Winter is when in-ground spas earn their keep, provided the plumbing is designed for it. Freeze protection, insulated lines, a properly sized heater and a well-fitted cover let the water hold temperature even when air temperatures drop below freezing.


    What size should an in-ground spa be?

    Most residential spas land between 7 and 8 feet across with a depth around 3 feet 6 inches, seating four to six people comfortably. KC Pool and Spa sizes spas to the household and the yard on every build in Kansas City, MO.


    Do I need a separate heater for a spillover spa?

    Not usually, since a spillover spa can share the pool heater through actuated valves that redirect flow when spa mode is selected. Adding a dedicated heater makes sense when the pool heater is undersized or near the end of its life.


    What is the difference between a gunite spa and an acrylic spa?

    Gunite spas are formed in place, so shape, depth, seating and jet layout are all custom, and the finish matches the pool. Acrylic inserts arrive premade in fixed sizes, install faster, and limit you to whatever seating the mold provides.