How Long Does It Take to Build a Composite Deck?
Quick Answer: Most composite decks take 3 to 7 business days of active construction once materials are on-site. The full timeline from signed contract to completed deck is typically 4 to 10 weeks, primarily due to permit approval (usually 2 to 4 weeks) and material lead times. Complex or large decks take longer to build. Illinois winters don’t pause permit timelines, so planning ahead for a spring or summer deck is smart.
The Two Timelines to Understand
There are two different timelines that matter here and homeowners often conflate them.
Construction timeline: How many days the crew is actually on your property building the deck. For most residential decks in the Oswego and Aurora area, this is 3 to 7 business days. A simple ground-level deck might be done in 2 to 3 days. A large multi-level deck with complex railing and stairs might take 8 to 12 days.
Total project timeline: From the day you sign a contract to the day the deck is complete and inspected. This is almost always 4 to 10 weeks, depending primarily on permit approval and material lead times. The construction portion is a minority of this total timeline.
When customers ask “how long does it take to build a deck,” they usually mean both – and they’re often surprised to learn that the biggest time component isn’t construction at all.
The Permit Phase
In Oswego and the surrounding Fox Valley municipalities, every deck requires a building permit. After a contract is signed and drawings are prepared, DDT submits the permit application to the municipality.
Permit review typically takes 2 to 4 weeks in Oswego. This timeline varies by municipality and by season – spring is peak application season, which can stretch review times. We factor permit timelines into the project schedule from day one.
We don’t start construction until the permit is approved. This is non-negotiable. Starting without a permit creates legal and insurance complications that are far worse than a 3-week wait. Why permits are required for decks in Oswego.
Material Lead Times
Once the permit is submitted (or approved, depending on when materials are ordered), composite decking and railing materials are ordered. Lead times from distributors are typically a few days to 2 weeks depending on the product and the season. We coordinate material delivery to align with the construction start date so materials are ready when the crew arrives.
What Affects Construction Duration
For the active construction phase, these factors affect how many days the crew is on your property:
Deck size. More square footage means more time for every phase.
Height. An elevated deck requires more framing work than a ground-level deck. Taller posts, more complex ledger work.
Complexity. A single-level rectangular deck is faster than a multi-level deck with two stair runs and a picture-frame border.
Weather. We plan around weather, but genuine disruptions (extended rain preventing concrete cure, or dangerous wind conditions for elevated work) add time.
Concrete cure time. After footings are poured, concrete needs at least 24 to 48 hours to cure before we load it with framing weight. This is a one-day pause built into the construction sequence regardless of deck size.
Inspections. The framing inspection must happen before decking goes down. We schedule this promptly, but it requires the inspector to visit the site, which adds at least a day to the sequence.
Important Considerations
Plan ahead for spring builds. If you want your deck done for Memorial Day weekend in Oswego, you need to start the process in February or early March. The permit timeline alone is 2 to 4 weeks, and spring is the busiest season for deck contractors and building departments alike. Starting conversations in January isn’t too early.
Fall builds are excellent. If you’re thinking about next year’s deck, fall is actually a great time to schedule. Weather is comfortable, contractors are often more available after the summer rush, and you’ll have a permit and materials ready to go for early the following spring if you want to get ahead.
Construction order matters. Footings one day, concrete cure, frame inspection, decking, railing, final inspection. This sequence can’t be compressed arbitrarily. Each step depends on the previous one.
The best time of year to build a deck in Illinois covers seasonal considerations in more depth.
What to Do Next
The sooner you start the process, the sooner you have a deck. Call DDT Deck Builders at 630-200-3945 to schedule a free in-person estimate. We’ll give you a realistic timeline for your specific project.
We serve Oswego, Aurora, Montgomery, Yorkville, Plainfield, and the surrounding Kane and Kendall County area.