Deck Permits in Markham: Requirements, Costs & How to Apply in 2026

Building a deck in Markham without the right permit can cost you thousands in fines — or worse, force you to tear the whole thing down. Before you pick out decking materials or call a contractor, you need to know exactly what Markham's Building Department requires.

Here's everything you need to navigate the permit process in 2026, from fees and timelines to setback rules and building codes specific to Markham, Ontario.

Do You Need a Deck Permit in Markham?

Yes, in most cases. The City of Markham requires a building permit for decks that meet certain thresholds. The general rule:

• Over 24 inches (60 cm) above finished grade — permit required
• Over 100 square feet (9.3 m²) — permit required
• Attached to your house — permit almost always required, regardless of size

A small, ground-level platform deck under 100 square feet that sits less than 24 inches off the ground may be exempt. But "exempt from a permit" doesn't mean exempt from building codes. Your deck still has to comply with the Ontario Building Code (OBC) and Markham's zoning bylaws, even if no permit is needed.

The safest move? Call Markham's Building Standards Department at 905-477-5530 before you start. A quick call can save you from a stop-work order mid-build.

When a Permit Is Required

Here's a breakdown of common scenarios Markham homeowners face:

You Definitely Need a Permit If:

• Your deck is more than 24 inches above grade at any point
• The deck exceeds 100 square feet
• It's attached to your home's structure (ledger board connection)
• You're adding a roof, pergola, or gazebo over the deck
• The deck includes stairs with more than 3 risers
• You're building over or near a municipal easement or setback line

You Might Not Need a Permit If:

• The deck is a freestanding platform under 100 sq ft
• It sits less than 24 inches above finished grade
• No roof or overhead structure is included

Even in exempt cases, zoning setback requirements still apply. You can't build a permit-exempt deck right up to your property line. Understanding the difference between attached and freestanding deck permits in Ontario matters here — a freestanding deck has different structural and permitting implications.

Permit Fees & Processing Time

How Much Does a Deck Permit Cost in Markham?

Markham's building permit fees are based on the estimated construction value of the project. For 2026, expect:

These are estimates. The City of Markham calculates fees using a formula tied to project valuation, which your contractor should be able to estimate. Additional charges may apply for zoning review or if your property is in a heritage conservation district like Markham Village or Unionville.

Plan review fees are typically included, but if revisions are needed, you may pay for re-examination.

How Long Does It Take?

• Standard residential deck permits: 10–20 business days for review
• Simple, straightforward applications: Sometimes faster, especially outside peak season
• Complex builds (multi-level, roofed structures, near easements): 4–8 weeks

Submit your application by March or early April if you're planning a spring build. Markham's building season runs roughly May through October, and contractor schedules fill fast. A delayed permit means a delayed start — and in a short Ontario building season, that delay can push your project into fall or even the following year.

For reference, here's what a typical deck project costs in Markham if you're budgeting alongside your permit:

For a full cost breakdown on popular deck sizes, see our guides on 12x16 deck costs in Ontario and 16x20 deck costs in Ontario.

Building Codes & Setback Rules in Markham

Ontario Building Code Requirements

Every deck in Markham must meet the Ontario Building Code (OBC). Key requirements include:

• Railing height: Minimum 36 inches (900 mm) for decks up to 5'10" above grade; 42 inches (1,070 mm) for anything higher
• Baluster spacing: No more than 4 inches (100 mm) between balusters — a child's head must not fit through
• Stair width: Minimum 36 inches clear
• Stair risers: Maximum 7.87 inches (200 mm) rise, minimum 8.25 inches (210 mm) run
• Load capacity: Decks must support a minimum 40 lb/sq ft live load plus dead load (the weight of the structure itself)
• Beam and joist sizing: Determined by span tables in the OBC — your plans need to show specific lumber dimensions and spacing

Frost Depth and Footing Requirements

This is where Markham's climate makes things more demanding than building in milder regions. Frost depth in the Markham/York Region area is approximately 48 inches (4 feet). Your deck footings must extend below this depth to prevent frost heave.

Options for footings include:

• Sono tubes (concrete piers): Most common. Poured to a minimum 48-inch depth with a footing pad at the base
• Helical screw piles: Faster to install, gaining popularity in York Region. No concrete needed, and they work well in Markham's clay-heavy soils
• Concrete pad footings: Used for ground-level decks in some cases, but not suitable for elevated structures

Frost heave is the number one structural risk for decks in Markham. Shallow footings will shift, causing your deck to lean, pull away from the house, or crack. This isn't theoretical — it happens every spring in neighborhoods across Markham, from Cornell to Berczy Village.

If you're choosing materials that can handle Markham's freeze-thaw cycles, our guide on the best decking materials for Ontario's freeze-thaw climate is worth reading.

Zoning Setbacks

Markham's zoning bylaws dictate how close you can build to your property lines:

• Rear yard setback: Typically 7.5 metres (24.6 feet) from the rear property line to the main structure, but decks often have reduced setback allowances — commonly 4 metres minimum
• Side yard setback: Usually 1.2 metres (4 feet) minimum, but varies by zone
• Lot coverage: Your deck counts toward your property's total lot coverage. Markham has maximum lot coverage percentages that vary by zone (typically 35–45% for residential)

These numbers vary depending on your specific zoning designation (R1, R2, R3, etc.). Check your property's zoning before designing your deck layout. You can look this up on Markham's online mapping tool or request a zoning certificate from the Planning Department.

Building Near Easements

Many properties in Markham — especially in newer subdivisions like Cathedraltown, Wismer Commons, and Angus Glen — have municipal easements running through the rear or side yard. You generally cannot build a permanent structure on an easement. If you're unsure whether your property has one, check your survey or contact Markham's engineering department. Our article on building near easements in Ontario covers this in detail.

How to Apply for a Deck Permit in Markham

Step 1: Gather Your Documents

Before you submit, you'll need:

• Site plan showing your property boundaries, existing structures, the proposed deck location, and distances to all property lines
• Construction drawings including plan view, elevation views, cross-sections, and footing details
• Structural details — beam sizes, joist spacing, post sizes, connection hardware, and railing specs
• Lot grading information if your deck is near a drainage swale or slopes

Drawings don't need to be architect-stamped for a standard residential deck, but they must be drawn to scale and clearly dimensioned. Many Markham contractors prepare permit drawings as part of their service.

Step 2: Submit Your Application

You can submit through:

• Online: Markham's building permit portal (part of York Region's online services)
• In person: Markham Civic Centre, 101 Town Centre Boulevard

Include your completed building permit application form, all drawings, and payment.

Step 3: Wait for Plan Review

The Building Standards Department reviews your submission for OBC compliance and zoning conformity. If something doesn't meet code, you'll receive a deficiency letter outlining what needs to be revised.

Step 4: Receive Your Permit

Once approved, you'll get your building permit. Post it visibly on-site during construction — inspectors need to see it.

Step 5: Schedule Inspections

Markham typically requires two inspections for deck projects:

1. Footing inspection — before pouring concrete (inspectors check depth, diameter, and rebar placement)
2. Final inspection — once the deck is complete (structure, railings, stairs, guards, and ledger connections)

Do not backfill footings or install decking before the footing inspection. If an inspector can't verify footing depth, you may need to excavate or even start over.

Use PaperPlan to visualize different decking materials on your own home before committing — it can help you finalize your design before submitting permit drawings.

What Happens If You Build Without a Permit

The consequences are real and expensive:

• Stop-work orders: The City can halt construction immediately
• Fines: Up to $50,000 for individuals and $100,000 for corporations under the Ontario Building Code Act
• Retroactive permit fees: You'll pay the permit fee plus a surcharge (often double the original fee)
• Forced removal: If the deck doesn't meet code, Markham can order you to demolish it at your own expense
• Insurance problems: Your homeowner's insurance may deny claims related to an unpermitted structure
• Real estate complications: Unpermitted decks show up during home inspections and can derail or delay a sale

In Markham's competitive real estate market, an unpermitted deck is a liability, not an asset. Buyers and their lawyers will flag it. You'll either fix it before closing or accept a reduced offer.

For the full rundown on risks, read our guide on building a deck without a permit in Ontario.

Frequently Asked Questions

How much does a deck permit cost in Markham?

Most residential deck permits in Markham cost between $150 and $600 CAD, depending on your project's estimated construction value. Large or complex builds over $25,000 in value may exceed $600. Contact Markham's Building Standards Department for an exact quote based on your project scope.

Can I build a small deck without a permit in Markham?

Possibly. If your deck is freestanding (not attached to the house), under 100 square feet, and less than 24 inches above grade, it may be exempt from requiring a permit. However, it still has to comply with the Ontario Building Code and Markham's zoning setback requirements. When in doubt, call the Building Department — it's a free call that could save you a costly mistake.

How deep do deck footings need to be in Markham?

Deck footings in Markham must extend below the frost line, which is approximately 48 inches (4 feet) in the York Region area. Footings that don't reach this depth are vulnerable to frost heave, which can shift your entire deck structure. This is especially critical in areas with Markham's typical clay soils, which retain moisture and are more susceptible to freeze-thaw movement.

How long does it take to get a deck permit approved in Markham?

Plan for 10 to 20 business days for a standard residential deck permit. If your application is complete and straightforward, it may be faster. Complex projects, applications with deficiencies, or submissions during peak spring season can take 4 to 8 weeks. Submit early — ideally by March — to stay ahead of the rush. Knowing the best time to build a deck in Ontario helps you plan your entire timeline.

Can my neighbour complain about my deck in Markham?

Yes. If your deck doesn't comply with zoning bylaws — setbacks, height, lot coverage — a neighbour's complaint can trigger a municipal investigation. Even if your deck is fully permitted, disputes about privacy and overlook are common, particularly with elevated decks in Markham's tighter lot subdivisions. Our article on whether a neighbour can complain about your deck in Ontario walks through your rights and options.