Cold Plunge Pad & Enclosure
The cold plunge tub the homeowner ordered from Plunge or BlueCube six months ago, that has been running in the garage on an extension cord ever since, that the homeowner knows should be outside on a proper pad with a proper electrical circuit and proper drainage but the project keeps getting deferred because nobody wants to be the general contractor on a four-trade install. The Penguin Chillers commercial unit a serious athlete bought for the back yard but never had a level pad to sit on. The Ice Barrel a CrossFit homeowner has been refilling with garden-hose ice water on a tarp on the patio because the chiller setup feels like a year-long project. Cold plunge pad and enclosure is the trade that turns the half-installed plunge into a finished outdoor-wellness space — a level concrete or paver pad sized for the tub and chiller footprint, drainage planning that puts the 80 to 150 gallons of drained water somewhere that does not flood the yard, a cedar privacy enclosure that makes the space feel like a destination rather than a tarp-covered project. Handis owns the carpentry top-to-bottom — pad prep, concrete or paver install, drainage build, and cedar enclosure construction. The licensed Washington L&I electrician handles the 240V GFCI sub-panel and circuit run for the chiller under NEC 680. From $2,000 for a paver pad with a basic three-sided cedar screen to $7,000 for a concrete pad with a full cedar enclosure, pergola overhead, and a built-in bench. Three to five working days.
Service
What Cold Plunge Pad & Enclosure Covers
Cold plunge install is a four-element project — the pad, the drainage, the cedar enclosure, and the electrical. Handis owns three of the four and coordinates the fourth (electrical) with a licensed Washington L&I electrician. Compatible with consumer-grade cold plunge tubs from Plunge, BlueCube, Penguin Chillers, Ice Barrel, and equivalent. The plunge tub itself is typically purchased directly by the homeowner from the manufacturer; we coordinate the delivery date so the tub arrives when the pad has cured and the electrical is ready.
The Pad — Concrete or Pavers
A cold plunge tub at full water weight (80 to 150 gallons plus the tub structure) is 700 to 1,400 pounds on a footprint of roughly 4 by 7 feet (Plunge), 3 by 5 feet (Ice Barrel), or 5 by 7 feet (BlueCube Pro). The pad has to be level and structurally sized for the load. Concrete (4 inches thick minimum, reinforced with rebar or wire mesh, sloped slightly for drainage, fully cured before the tub goes on) is the gold standard and the right choice for a permanent install. Pavers on a compacted base (4 to 6 inches of compacted crushed gravel and bedding sand, 2 to 3-inch paver thickness) work for a budget-conscious or potentially-temporary install. Concrete usually wins for cold plunges because the chiller equipment also wants a level base and a concrete pad provides a unified surface for both.
The Drainage — Drywell, French Drain, or Sewer
A cold plunge holds 80 to 150 gallons that gets drained every 2 to 4 weeks for cleaning. That water needs a destination. Options — French drain to a gravel-and-fabric drywell (sized for the soil's percolation rate at the property), surface drain to landscape drainage (where the yard slope can carry the water away), or a permitted connection to the sanitary sewer (Seattle DCI permits sewer-connected outdoor plunges with backflow prevention). Clay soil in many Seattle neighborhoods needs a larger drywell or the sewer option; sandy or gravelly soil drains naturally to a smaller drywell. We plan the drainage at the estimate visit based on a soil-percolation test or a known soil-type for the property.
The Cedar Enclosure
Cedar privacy screen on the sides where neighbors see in (typically one to three sides depending on the property). Slat spacing 3/4-inch for full privacy with airflow, 1/4-inch for screen-only with maximum airflow. Pergola overhead optional for partial rain coverage during use and to define the space (cedar slats spaced 3 inches apart on the pergola block 70 percent of vertical rain). Built-in cedar bench optional for towels, robes, and a seat for shoes or socks before-and-after. Cedar grade is Western red cedar from a local supplier (Dunn Lumber, McLendon, Crosscut Hardwoods) — we will not use big-box-store cedar that is sometimes wet-stacked and twists in PNW weather.
The Electrical — Licensed WA L&I Electrician, NEC 680
The 240V GFCI circuit for the chiller is regulated work under NEC 680. The licensed Washington L&I electrician handles the sub-panel installation, the circuit run from the main panel, the GFCI protection, the equipotential bonding to all metal parts within 5 feet of the tub, the conductor depth and the bonding-grid requirements. We name the electrician on the quote, schedule their two visits (panel and rough-in at start of project; final connection and inspection after the tub is set), and the electrician pulls the permit under their license.
How the Cold Plunge Install Works
Six sequential phases from site review to first plunge — the actual working sequence we run on every cold plunge install, with the licensed electrician on two scheduled visits inside the project timeline.
Site Review + Tub and Equipment Spec
Estimate visit walks through the tub the homeowner has (or plans to purchase — Plunge, BlueCube, Penguin Chillers, Ice Barrel, or equivalent), the chiller equipment footprint, the site location (side yard, back patio, deck-adjacent), the privacy needs (which sides need screening), the drainage routing (drywell vs sewer based on soil type and slope), and the electrical run (distance from the main panel, sub-panel location, conductor sizing).
Pad Excavation + Forming (Day 1)
For a concrete pad, the location is excavated 4 to 6 inches deep to the pad footprint plus equipment footprint, a compacted gravel base is set, forms are built for the pad shape, rebar or wire mesh laid for reinforcement. For pavers, the same excavation depth with a thicker compacted gravel and sand base. The drainage routing trenched to the drywell or sewer connection location at the same time.
Electrician Visit 1 — Sub-Panel + Conduit Rough-In (Day 1-2)
Licensed Washington L&I electrician arrives to mount the 240V GFCI sub-panel at the house exterior (or interior basement-wall location), run the conduit and conductors from the main panel to the sub-panel, stub up the conduit to the chiller equipment location. The electrician pulls the electrical permit under their license. NEC 680 bonding-grid wire installed in the gravel base of the pad before the concrete is poured.
Concrete Pour or Paver Set + Drainage Build (Day 2-3)
Concrete poured, screeded, finished with a light broom texture for slip resistance, sloped slightly to one corner for water shedding. Concrete cures 3 to 4 days before any weight goes on it (high-early-strength concrete cures in 2 days if the schedule is tight). Drainage drywell installed concurrently with the concrete cure (the drywell does not need pad cure to be built). For pavers, the pavers are laid on the bedding sand, jointed, and ready for use the same day.
Cedar Enclosure Build (Day 3-4)
Cedar slat privacy screens framed and slat-installed on the sides specified (typically one to three sides depending on the property). Pergola overhead framed with 6x6 cedar posts and 4x6 cedar rafters if specified. Built-in cedar bench framed and slat-tops installed if specified. Posts through-bolted to the concrete pad with stainless anchor bolts and base plates (or set into post bases for pavers). All cedar joints stainless-fastened.
Electrician Visit 2 + Tub Delivery + First Plunge (Day 4-5)
Licensed Washington L&I electrician returns for the final circuit connection at the chiller equipment, the GFCI test, the bonding verification, and the electrical inspection scheduled with the AHJ. Tub and chiller delivered by the manufacturer's shipping or by the homeowner's vehicle, positioned on the cured pad, plumbed to the chiller per the manufacturer's instructions. Chiller filled and started up; first plunge typically the following morning after the chiller has brought the water down to setpoint.
Cold Plunge Pad & Enclosure Pricing
Final pricing depends on the pad type (pavers vs concrete), the pad size (sized for tub plus chiller equipment plus access space), the enclosure scope (three-sided screen, pergola overhead, full enclosure with bench), the drainage routing (drywell distance, sewer connection if applicable), and the licensed electrician portion (sub-panel install, circuit run distance from main panel, NEC 680 bonding). The licensed electrician's portion is included transparently on every quote. Request a free in-home estimate for an accurate quote against your actual site.
Tell us the cold plunge tub you have (or plan to buy) and the site — we will quote the pad, drainage, enclosure, and the licensed electrician portion line by line.
Why Seattle Homeowners Book Handis for Cold Plunge Installs
A cold plunge in the back yard sounds simple — buy the tub, put it on a level surface, plug it in. The reality is four trades — concrete (the pad), drainage (the drywell or sewer), carpentry (the enclosure), and electrical (the NEC 680 circuit). The homeowner who tries to coordinate the four trades themselves watches the project sit for months while each trade waits on another, or worse, ends up with a tub on a slightly-out-of-level paver patio plugged into an extension cord from the garage outlet. Handis runs the carpentry top-to-bottom — pad, drainage, enclosure — and coordinates the licensed Washington L&I electrician inside the project timeline (two scheduled visits, one for the sub-panel and conduit rough-in before the pad is poured, one for the final connection after the tub is set). The electrician pulls the permit under their license, schedules the inspection, and stands behind the NEC 680 work. We name everyone on the quote and you sign one contract for the whole project.
One project lead — pad, drainage, enclosure self-performed; electrical coordinated
Handis owns the carpentry on every cold plunge install — pad prep and pour, drainage build, cedar enclosure construction, finishes. The licensed Washington L&I electrician handles the NEC 680 work on two scheduled visits inside the project timeline. The homeowner sees one project manager, one schedule, one walk-through at the end. The electrician's portion is named on the quote line by line so the homeowner sees exactly what each trade is doing.
NEC 680 compliance — bonding grid pre-installed in the pad
NEC 680 requires an equipotential bonding grid around the tub footprint to prevent voltage differences between metal parts inside and outside the tub (the rare but serious shock hazard). We install the bonding-grid wire in the gravel base before the concrete is poured, on every concrete-pad install, so the grid is permanently in the pad and connected to the electrician's bond. This is the part that gets skipped on improper installs and is impossible to add after the pad is poured. Doing it right the first time is non-negotiable.
Drainage planned at the estimate visit — soil type, slope, AHJ permit
Drainage gets planned at the estimate visit, not retrofitted at the end. We assess the soil type (clay vs sandy vs gravelly — drives drywell sizing), the yard slope (drives surface drainage vs piped drainage), the distance to the nearest sewer connection (drives sewer-vs-drywell decision), and the AHJ permit requirements (Seattle DCI permits sewer-connected outdoor plunges with backflow prevention). The drainage routing is part of the contract and trenched during the same excavation as the pad foundation.
Cedar enclosure built to last in PNW weather — local kiln-dried supply
Cedar enclosures hold up in PNW rain for 15 to 20 years if built correctly. We use kiln-dried Western red cedar from a local supplier (Dunn Lumber, McLendon, Crosscut Hardwoods) — never big-box-store cedar that is sometimes wet-stacked and twists or checks within months in PNW climate. All cedar joints stainless-fastened (never galvanized — galvanized fasteners stain cedar over time). Posts through-bolted to the concrete with stainless anchor bolts and base plates. Slat spacing chosen for the privacy detail desired (3/4-inch for full privacy with airflow, 1/4-inch for screen-only).
Insured, background-checked, written one-year project warranty
Handis carries general liability and workers' compensation; every technician has cleared a background screening. The one-year project warranty covers our carpentry — cedar framing, enclosure construction, pad pour, drainage performance — and finishes. The licensed electrician's portion (NEC 680 sub-panel, GFCI circuit, bonding) carries the electrician's own Washington L&I-trade warranty under their license, named on the quote so you know whom to call for what.
Estimate
Tell us the cold plunge tub you have or plan to buy (Plunge, BlueCube, Penguin Chillers, Ice Barrel, or equivalent — model name if you know it), the site location (side yard, back patio, deck-adjacent), the privacy preference (which sides need screening), any constraints (existing pad you want to use, distance from the main electrical panel, soil type if you know it), and the budget range. We send back a clear estimate with the licensed electrician portion named line by line and a project timeline.
Customer Reviews
Cold plunge install reviews from verified Seattle-area Handis customers.
Cold plunge pad and full cedar enclosure in our Capitol Hill back yard. We had bought a Plunge tub six months earlier and were running it on an extension cord in the garage. Handis poured a 5 by 7 concrete pad, built a three-sided cedar slat enclosure with a pergola overhead, ran the drainage to a permitted drywell. The licensed electrician came in for two visits to run the 240V GFCI circuit and the NEC 680 bonding to the pad — all named on the quote and inspected. Five working days. The tub finally feels like it belongs in the back yard rather than hiding in the garage.
BlueCube Pro install in our Mercer Island side yard. Sized the pad for both the tub and the chiller equipment with a small cedar utility closet at one end. Sandy soil at our property meant a small drywell handled the drainage easily. Four working days. The licensed electrician handled the sub-panel install and NEC 680 bonding — the inspection passed first try. The cold plunge has become a daily morning routine.
Penguin Chillers commercial-grade install on a poured concrete pad in our Bothell back yard. Wanted the heavy-duty chiller for two-person use and ice-cold operation. Handis poured a 6 by 8 pad sized for the tub plus the chiller equipment plus a small cedar bench, built a three-sided cedar privacy screen (the back of the property faces a greenbelt so the fourth side stayed open). Five working days. The Norse-style hot-then-cold routine has become a weekly thing now.
Ice Barrel install on a smaller paver pad in our West Seattle side yard. Budget-conscious approach — pavers instead of concrete, basic two-sided cedar screen, drywell drainage. Two working days plus the electrician visits. Cost came in at $2,400 all in. The tub is finally on a proper pad with a proper circuit instead of an extension cord across the lawn from the back of the garage.
Combined cold plunge and hot tub side-by-side install on a new concrete pad in Bellevue. Handis poured a 10 by 12 pad sized for both tubs with the chiller and the hot tub equipment in a small cedar utility closet at one end. Licensed electrician ran two 240V GFCI circuits (one for the hot tub, one for the chiller) and did the NEC 680 bonding for the whole pad. Cedar privacy screens on three sides and a pergola overhead. Seven working days total. The hot-then-cold contrast routine on a 35-degree January morning is something else.
Frequently Asked Questions
Common questions about Handis cold plunge installs — pad type, drainage, electrical, scheduling, and what to expect.