The best time of year to build a fence or deck in the GTA
The GTA building season runs April to November, and winter work is possible on screw piles. The month you book matters more than the month you build, because a locate and a permit both have fixed lead times.
Key takeaways
- The GTA building season runs April to November. Winter installs are possible on screw piles, which do not need a concrete pour.
- Concrete set posts need workable ground. The frost line here is 1,200 mm, and a footing has to reach below it whatever the month.
- An Ontario One Call locate is required by law and takes a minimum of five business days on a single property, or ten where the work spans multiple properties.
- Book the permit conversation before the build slot, because a deck over 600 mm above grade is a building permit project in most GTA municipalities.
- Late winter and early spring are the quietest booking weeks and the easiest time to get the measurement and the drawings done.
There is a short answer and a useful one. The short answer is that most fences and decks in the Greater Toronto Area get built between April and November. The useful answer is that the month you book matters more than the month you build, because the two things that gate a start date are a locate and a permit, and neither of them accelerates for good weather.
The best time of year to build a fence or deck in the GTA
The regional building season is April to November, and winter installs remain possible on screw piles. Those two facts together describe almost every scheduling decision in this market.
What closes the season is not cold air, it is frozen ground. Posts and deck piers are set below the 1,200 mm frost line, which is the same depth across every municipality we serve. Digging that depth through frozen ground is slower, and concrete poured into a cold hole does not cure the way it does in September.
Screw piles are the exception that keeps winter work viable. They are driven rather than poured, so there is no concrete cure to protect, which makes them the practical choice for a January or February deck frame. Where a project can use them, the deck building page covers how the footing method is chosen.
Season by season, what actually happens
| Period | Ground and weather | What it is good for |
|---|---|---|
| January to March | Frozen; concrete cure unreliable | Measuring, drawings, permits, screw pile work, booking ahead of the rush |
| April to May | Thawing to workable | The first concrete set posts of the year; the busiest booking window |
| June to August | Fully workable and dry | Full builds; cedar and composite both go down well |
| September to October | Workable, cooler, less rain pressure | The best conditions of the year for a large deck |
| November | Closing; first hard frosts | Finishing work started earlier; screw pile starts |
| December | Frozen in most weeks | Screw pile work and repairs |
The shoulder weeks at either end move by a few weeks each year with the weather. Newmarket is the coldest and snowiest of the York Region municipalities we serve, and it typically closes and opens a little later than the lakeshore cities.
Book earlier than you think, for two reasons that have nothing to do with weather
Both of the delays in front of a fence or deck project are administrative, and both are fixed length.
- The locate. Ontario One Call is a legal requirement before digging, not a courtesy, and the HCRA names building a fence or a deck explicitly. The minimum is five business days for a single property, and ten business days where the project spans multiple properties or land with no civic address. Source: Landscape Ontario on provincial locate law.
- The permit. A deck whose walking surface sits more than 600 mm above grade requires a guard under Ontario Building Code section 9.8.8, and in most GTA municipalities it requires a building permit. Whitby states the 600 mm permit trigger outright, and adds that Zoning By-law 1784 applies at any height.
A fence is usually the faster of the two. Rear and side yard fences up to 2.0 m and front yard fences up to 1.0 m are permitted without a permit in most of these municipalities, so a fence run is gated by the locate alone. The exceptions are pools, where an enclosure permit is required, and Markham, where a fence exemption permit is the route for going above the height limit.
What to do in the off season
February is the most productive month of the year for a project that gets built in May.
- Get the yard measured and the run or the deck outline settled while the crews are not on site.
- Confirm the height limit that applies to your own address, front, side or rear, before choosing a material.
- Get the drawings assembled if a permit is in scope: site plan with setbacks, framing plan, footing detail and guard detail.
- Decide the surface. The material decision is the one that takes homeowners longest, and there is no reason for it to happen in the same week as the build.
- File the locate once the start window is real.
The service area pages name the permit authority and the local by-law for each of the eighteen cities we cover, which is the fastest way to find out which office to call.
Does material choice change the season
Only at the margins. Cedar, pressure-treated, vinyl, composite, PVC, aluminum and chain link all install in the same weather window, because what limits the work is the ground rather than the board.
Two material notes are seasonal in practice. A cedar deck or fence installed in late autumn is usually left to dry through the winter and oiled the following spring, because a finish applied to damp wood in the cold does not hold. And in a deep Ontario cold snap, vinyl is more brittle than wood, so a panel takes a direct hit from snowblower discharge less gracefully. That is survivable, because individual vinyl panels swap out of the routed rails without rebuilding the run.
Aluminum is the material least affected by the calendar. It has no iron in it to oxidise, and the powder coat finish is baked on rather than brushed on, so the bottom rail that sits in snow and road salt from December to March is not the part that fails.
If the existing structure has come through a winter badly, the honest first step is an assessment rather than a rebuild quote, and the fence repair page sets out what is repairable. To get a price range for either a repair or a new build, use the online estimate and the measured final price is confirmed on site before any work starts.
Questions we get asked
01Can a fence be installed in winter in Ontario?
Yes, but the method changes. Posts and piers have to reach below the 1,200 mm frost line, and digging that depth through frozen ground is slower while concrete poured into a cold hole does not cure properly. Screw piles are driven rather than poured, so there is no cure to protect, which is what keeps winter deck framing viable.
02How far ahead should I book a fence or deck?
Far enough to absorb two fixed delays. The Ontario One Call locate is a legal minimum of five business days on a single property, or ten business days across multiple properties. A deck over 600 mm above grade also needs a building permit in most GTA municipalities. Booking in late winter for a spring build clears both without compressing the build itself.
03What is the best month to build a deck in the GTA?
September and October give the best conditions of the year for a large deck: workable ground, cooler working temperatures and less rain pressure than early summer. April and May are the busiest booking weeks, so the same build scheduled then usually waits longer to start.
04Should a new cedar deck be stained right away?
Not if it goes in late in the season. A cedar deck or fence installed in late autumn is usually left to dry through the winter and oiled the following spring, because a finish applied to damp wood in the cold will not hold.
