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Composite deck with black aluminum railing at a Markham home built by DECKLAB

Markham • Deck Building & Design

Deck Builder in Markham

Decks that suit the house — heritage charm in Unionville, clean lines in Cornell.

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Deck Building in Markham

Two Kinds of Markham Homes, Two Kinds of Decks

Markham is really two deck-building worlds. In Unionville and Old Markham, the streets carry heritage character — mature trees, older homes, and in the conservation district, an expectation that what you build should look like it belongs. A deck there should whisper, not shout: natural cedar tones, classic railing lines, proportions that respect the house.

Drive ten minutes to Cornell, Berczy or Angus Glen and the brief flips. These are newer two-storey homes, many with raised basement walkouts, where the kitchen door can sit a full flight above the lawn. The design language is different — crisp composite boards, black aluminum railings, wide modern stairs — and the engineering matters more, because the deck starts high and the yard often slopes away beneath it.

DECKLAB builds in both worlds. What never changes is the starting point: we design around your house, your lot and your street — not from a template.

Composite deck at the front of a Markham-area home built by DECKLAB
Raised Decks

Built for Markham's Raised Walkouts

A high walkout deck is a structure first and a surface second. Posts and footings carry a full storey of height; the framing has to resist sway; the stairs need landings placed where your family actually walks — toward the side gate, the garden, or the driveway — not just where they fit on paper. We plan all of that before the first hole is dug.

How We Work in Markham

From Heritage Streets to New Subdivisions

01

Site Visit

We visit your Markham home, measure the yard and the walkout height, and note anything your street or lot requires — heritage review included, if it applies.

02

Design & Materials

A layout drawn for your house: deck level, stair runs, railing style, and wood or composite boards chosen with you, sample in hand.

03

Approvals & Build

We confirm the City of Markham's requirements for your address, then build the full structure — footings to railings — with our own crew.

04

Walkthrough

A final walk of the deck together, every detail checked, and your yard left clean and ready for the season.

Pricing

Deck Prices in Markham

One published rate card for the whole GTA — installed, per square foot. Markham's taller walkout decks add structure and stairs, which your exact quote itemizes clearly.

Pressure-Treated Wood

$22–35
per sq ft installed

Real wood at the most accessible price — a natural fit for Markham's older streets. Material warranty 10–15 years.

Cedar

$25–38
per sq ft installed

The heritage-street favourite: warm colour, natural rot resistance, and a 15–20 year material warranty.

Composite

$28–40
per sq ft installed

The new-subdivision favourite: clean lines, zero staining, and a 25-year material warranty.

Steps and skirting run a flat $120–$300 on most builds. Price your own dimensions instantly with the Deck Calculator, or get a free estimate and attach photos of your walkout — height is the detail that matters most in Markham.

Markham Deck FAQ

Questions From Markham Homeowners

Do you build decks in Unionville's heritage area?
Yes. Parts of Unionville are a heritage conservation district, so exterior work there deserves extra care — and some projects may need a heritage review before building. We flag that at the quoting stage, design in natural materials and tones that suit the street, and tell you honestly what approvals your address involves.
Our Markham home has a high rear walkout. Can you still build a deck?
Absolutely — raised decks are one of the most common builds in Cornell, Berczy and Angus Glen, where the kitchen door sits well above the garden. Tall decks need deeper footings, properly sized posts and bracing, and stairs planned around the slope. That is standard work for us.
How much does a deck cost in Markham?
The same published rates we use across the GTA: pressure-treated wood $22–35 per sq ft installed, cedar $25–38, and composite $28–40. Height is the main Markham variable — a tall walkout deck needs more structure and stairs than a ground-level one, which your exact quote will reflect.
Which parts of Markham do you cover?
All of Markham — Unionville, Cornell, Berczy, Angus Glen, Markham Village, Box Grove and Thornhill on the Markham side — plus the rest of the GTA, including Toronto and Vaughan.
Keep Exploring

More DECKLAB Pages for GTA Homeowners

Let’s Design Your Markham Deck

Heritage street or brand-new subdivision — tell us about your yard and we’ll design the deck that belongs there.