The best time to build a deck in the Lower Mainland is late spring to early fall, when dry weather suits footings, staining and vinyl membranes. The best time to plan one is fall and winter. If your quotes and permit are sorted during the wet months, your builder can start as soon as the weather turns.
The Lower Mainland deck building season
Our dry window runs roughly May to September. From fall to spring, rain is the norm, and it affects some parts of a deck build more than others.
Rain matters most for three things: footings, finishes and membranes. Digging and pouring footings is harder when holes fill with water. That is especially true on the wet clay, peat and high water tables found in parts of Surrey, Langley, Delta, Richmond, Pitt Meadows and the Fraser Valley floor. Staining needs dry wood and dry days. Vinyl membranes need dry weather to go down properly.
Frost is less of a worry here. Frost depth in the Lower Mainland is shallow, about 450 to 600 mm, so footings do not need to go as deep as they do on the Prairies.
On soft or wet soils, many builders use helical (screw) piles instead of concrete piers. They cost more, about $400 to $800 each compared with $150 to $400 for a concrete sonotube pier, but they are often the right call on sites where the ground stays wet.
Why fall and winter are the best time to plan
Many homeowners start thinking about a new deck in spring. That is also when builders' schedules fill up. If you first call in May, the earliest start date on offer may be well into summer.
Permits add more time. Most Lower Mainland municipalities require a building permit for decks more than 600 mm (24 in) above grade or attached to the house. Typical permit timelines are 3 to 8 weeks, and 6 to 12 weeks for covered or engineered decks.
Before you can apply, you may need drawings and a stamped structural design. Engineering is commonly required for second-storey decks, covered roofs, sloped lots, helical pile foundations and frameless glass guards. That work has to be done before the permit clock even starts.
A few local examples show why it pays to start early:
- Surrey asks for a full drawing set (site plan, foundation plan, floor plan, cross-section and elevations), a title search and a fee based on the cost of work.
- Port Coquitlam doubles permit fees if work starts before the permit is issued.
- Chilliwack posts the application date of residential permits currently under review, instead of fixed processing times.
Rules vary by municipality, so always confirm with your city. Our guide on whether you need a deck permit in BC explains the common triggers, and our Surrey permit page shows what one city asks for.
Winter planning also gives you time to compare quotes properly, instead of taking the first builder with an opening. Our guide on how to compare deck quotes shows what to look for.
What can be built in the wet months
A deck can go up between October and April. It just takes more planning around the weather.
Framing and decking. Posts, beams, joists and boards can be installed in wet weather. Crews work between showers and keep materials covered. Joist tape on the frame is recommended in our wet climate whatever the season.
Footings, with care. Footings can be dug and poured in the rainy season, but holes have to be kept free of water, and clay sites can turn to mud. Ask your builder how they handle water in footing holes, and whether helical piles make sense on your lot.
Composite and PVC boards. Composite decking and PVC need no stain or sealer, so there is no finishing step waiting for a dry spell.
Vinyl membranes need dry weather. Membrane work is best done from roughly May to September. If you want a vinyl deck, plan the build so the membrane goes down in a dry stretch. If the framing goes up earlier, ask how the plywood will be protected until then.
Staining needs dry days. Staining is only practical from about May to September. A wood deck built in winter can be stained the following summer, once the wood and the weather are both dry.
If you want to use your deck in the rainy months too, price a cover at the same time. Our guide to covered deck costs explains the options.
Is it cheaper to build a deck in the off-season?
It can be. Some builders have more open dates and more room on labour pricing between October and March, when demand is lower. Treat that as possible, not promised. Not every builder offers it, materials cost the same, and wet weather can slow the job down. Ask each builder directly whether they have off-season pricing or open winter dates.
Waiting for prices to fall has not paid off lately. Statistics Canada reports that Vancouver deck construction prices in early 2025 were 113.6% higher than in early 2017, driven mainly by lumber. For current budgets by material and size, see our Lower Mainland deck cost guide or try the deck cost calculator.
Month-by-month deck planning calendar
This plan assumes you want to be using a new deck by early summer. If your deck is low and simple, you can compress it. If it is covered or second storey, start earlier.
| Month | Weather | What to do |
|---|---|---|
| October | Rain returns | Plan. Decide what you want, measure the space, set a budget and note any slope, trees or access issues. |
| November | Wet | Quote. Request quotes and meet builders on site. Compare designs, materials and prices. |
| December | Wet, short days | Choose a builder. Start drawings, and engineering if your deck needs it. |
| January | Wet | Permit. Submit the application. Ask about off-season start dates for framing and footings. |
| February | Wet | Permit review, typically 3 to 8 weeks, or 6 to 12 for covered or engineered decks. Confirm materials and colours. |
| March | Wet, some dry days | Approvals start to arrive. Builds can begin between showers. The off-season window closes. |
| April | Drying out | Build. Footings and framing go in as the ground firms up. |
| May | Dry window opens | Build and finish. Staining and membrane work become practical. Late callers may wait for a start date. |
| June to August | Dry | Peak building season. Finish staining and vinyl membranes, and start enjoying the deck. |
| September | Dry, cooling | Last reliable month for staining and membranes. A good time to start planning next year's project. |
How long does a deck project take?
Think of a deck project in four stages: design and quotes, engineering and permits, the build, and finishing.
Permits are the most predictable wait: typically 3 to 8 weeks, or 6 to 12 weeks for covered or engineered decks. Any engineering has to be finished before you apply.
The on-site build depends on size, height, footings, access and weather. A low, simple deck is a much shorter job than a second-storey deck with a roof, a full stair flight and glass railings. Tight lots, no lane access and materials carried through the house all add labour. Ask each builder for an estimated start date and on-site duration in writing, so you can compare them side by side.
Finishing can come later. A pressure-treated or cedar deck may need to wait for a dry stretch before it is stained, and a vinyl membrane needs dry weather to go down.
Low decks can move faster. Several municipalities, including Richmond, Delta, Coquitlam and the District of North Vancouver, do not require a permit for decks under 600 mm (24 in), though that work must still meet the BC Building Code and local zoning. Check with your city before you count on it.
Start planning now for a summer deck
If you want a deck ready for summer, fall and winter are the time to get moving. Book site visits, compare prices and get your permit in while builders still have room in their spring schedules. Get free quotes from up to 3 vetted local builders for new decks, replacements and covered decks.
Common questions
Can you build a deck in winter in Vancouver?
Yes. Framing and decking can go in during the wet months, and footings can be poured with care to keep water out of the holes. Staining and vinyl membrane work need dry weather, roughly May to September.
How far ahead should I book a deck builder?
If you want a deck by summer, start planning and getting quotes in fall or winter, before builders' spring schedules fill. Typical permit timelines are 3 to 8 weeks, and 6 to 12 weeks for covered or engineered decks.
Is it cheaper to build a deck in the off-season?
It can be. Some builders have more open dates and more room on labour pricing between October and March, when demand is lower, but it isn't guaranteed and wet weather can slow the work.
When can I stain a new deck in BC?
Staining is only practical from about May to September, on dry days. A wood deck built in winter can be stained the following summer once the wood is dry.