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Project

Composite Hot-Tub Deck With Cedar Pergola Roof — Tsawwassen

LocationTsawwassen, BC
Year2024
Duration5
Finished hot-tub deck in Tsawwassen — composite boards, free-standing cedar pergola roof with skylight, cedar T&G ceiling, cedar skirt at the spa and warm string lights at dusk.
Finished hot-tub deck in Tsawwassen — composite boards, free-standing cedar pergola roof with skylight, cedar T&G ceiling, cedar skirt at the spa and warm string lights at dusk.

Overview

The project in one paragraph

A complete backyard outdoor-spa build in Tsawwassen, BC — from bare dirt to a finished composite deck with a free-standing cedar pergola roof, T&G cedar ceiling, skylight over the hot tub, cedar trim skirt around the spa and warm string-lit dusk atmosphere.

Starting from a bare dirt yard

The homeowners had just had a new hot tub delivered, and the corner of the backyard where it needed to live was bare dirt, a tarp gazebo and a few pre-cast pucks under a temporary frame. They wanted the whole corner turned into a proper outdoor spa — solid deck, a real roof over the tub, room around it for the cover-lifter to swing, and a finish that would still look right in ten years. We took it on as one continuous build from the ground prep through the finish carpentry.

Starting from a bare dirt yard

Gravel base and pressure-treated deck framing

First step was excavating and laying a deep crushed-gravel base so the whole deck pad would drain and stay stable through the wet season. The hot tub sits on its own dedicated reinforced support pad that's structurally isolated from the deck framing — that matters because a full hot tub weighs several thousand pounds and you never want that load hanging off your joists. Around it, we framed the deck out of pressure-treated 2× material on the gravel, sized so the cover-lifter and seating around the tub all have proper clearance.

Gravel base and pressure-treated deck framing

Free-standing cedar pergola roof

The roof structure is a free-standing western red cedar post-and-beam pergola — it doesn't tie into the house, it stands on its own posts at the corners of the hot-tub bay. We sized the beams and rafters to span the spa without an intermediate post, and pitched the roof gently so rain runs off cleanly to the back. Building it free-standing means the house wall is left alone — no new ledger to flash, no new penetrations into the building envelope.

Free-standing cedar pergola roof

Cedar T&G ceiling with a skylight over the tub

Under the roof, we finished the ceiling in clear western red cedar tongue-and-groove, blind-nailed through the tongue so no fasteners show on the finished face. Right above the hot tub we framed in a fixed skylight — a sealed, factory glass unit boxed cleanly with a cedar return on all four sides — so when you're in the tub at night you can actually see the sky, and during the day the bay isn't a dark hole. The cedar return around the skylight is mitered tight at the corners and matches the ceiling boards.

Cedar T&G ceiling with a skylight over the tubCedar T&G ceiling with a skylight over the tubCedar T&G ceiling with a skylight over the tub

Composite deck and cedar trim skirt at the hot tub

The deck surface is capped composite with hidden fasteners — no exposed screw heads, no annual sanding or restaining, and a slip-resistant finish that handles wet feet stepping out of the tub. Where the deck meets the tub, we built a custom cedar trim skirt that wraps the cabinet of the spa with mitered cedar at every corner. That detail does two things: it visually integrates the tub into the deck instead of leaving the factory cabinet sitting on top of a deck, and it gives a clean reveal so service panels still pop off when the tub needs maintenance.

Composite deck and cedar trim skirt at the hot tubComposite deck and cedar trim skirt at the hot tub

The finished spa at dusk

Once everything was structurally finished we hung Edison-bulb string lights along the cedar beams, ran composite-clad stair treads with black metal railings down to the lawn, and handed it over. The dusk shots are the real story: warm cedar overhead, a skylight glowing at the centre of the ceiling, the hot tub tucked under cover so weather isn't a reason to skip a soak, and a deck the homeowners can walk barefoot on. A full back-corner of the yard turned into an outdoor room they actually use through the winter, not just in summer.

The finished spa at duskThe finished spa at dusk

Project Questions

FAQs about this build

Why put the hot tub on its own pad instead of just on the deck framing?

A full hot tub with water and people in it can weigh more than three thousand pounds, concentrated on a small footprint. Carrying that on standard deck framing means oversized joists and posts everywhere, and any settlement in the deck pulls on the tub. Setting the spa on a dedicated reinforced pad that's isolated from the deck means the tub has its own engineered support, the deck stays light, and the two can move independently with seasonal ground changes.

Why a free-standing cedar pergola roof instead of attaching it to the house?

Two reasons. First, attaching a new roof to an existing wall means cutting into the building envelope to install a ledger, flashing, and a weather-tight transition — every one of those is a potential leak in the future. Free-standing avoids all of that. Second, the geometry of this corner just worked better as a standalone structure — clean post lines around the tub bay rather than an awkward tie-in to the house siding behind it.

Doesn't a skylight over a hot tub get filthy from the steam?

A fixed factory-sealed skylight unit handles the moisture fine — the glass is tempered and the seal is rated for wet-area installations. We chose a fixed (non-opening) unit specifically so there are no operating seals to fail over a steaming tub. Rain washes the top regularly out here, and from underneath the cedar return around it stays well above the splash zone of the spa.

Will the cedar grey out over time?

Yes — that's normal for cedar on the coast. The ceiling under the roof is protected from direct rain and UV so it'll hold its warm tone for years. The exposed beams and exterior face will slowly silver if left raw, which a lot of homeowners actually prefer with composite decking underneath; if you want to keep the warm cedar tone, we can come back and apply a semi-transparent stain on a normal maintenance cycle.

Want something similar?

If you've got a sloped yard, failing pavers or drainage issues, that's a project we'd be glad to look at. Free site visit and honest scope.

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