Can You Still Get a Deck Built Before Fall in St. Louis? (Honest Answer)

We get this call several times a week in July. “We’ve been thinking about a new deck. Is it too late to get it built before fall?”

The honest answer: usually no, you’re not too late — but you’re getting closer to a real deadline, and the answer depends on what kind of deck you want.

Here’s what’s actually possible from a July start date in St. Louis, what timelines look like, and what you need to know to make it happen this summer instead of waiting until next year.

The Short Answer

Yes — most decks started in July can be completed by mid to late September in St. Louis. Some can be done sooner. A few might push into early October. The variables that determine your timeline:

• Permit timeline in your specific municipality (2–6 weeks)
• Materials availability (composite has gotten easier; specialty cedar can be slower)
• Complexity of the build (simple rectangular deck vs. multi-level with built-ins)
• Whether you’ve already made design decisions
• Contractor’s current schedule (gets tighter every week through summer)

If you start the conversation this week, a moderate-complexity deck (composite, 300–500 sq ft, single level or simple step-down) is very achievable by early-to-mid September. More ambitious builds may push later but are still achievable before cold weather.

Realistic Timeline From a July Start

Here’s what the process actually looks like if you contact a contractor in mid-July:

Week 1: Initial consultation and design. Contractor visits, measures, talks through design and materials, provides initial estimate. Sometimes a single visit, sometimes two.

Week 2: Design finalization and contract. Final design decisions, material selections, contract signed. Deposit collected.

Week 3–6: Permits and materials. Permits filed and approved (varies by municipality — Chesterfield, Fenton, Ballwin all have different timelines), materials ordered and delivered. This is the longest phase and the hardest to control.

Week 7–9: Construction. Demolition of existing deck if applicable, footings poured, framing built, decking installed, railings, finish work. A typical 300–500 sq ft composite deck takes 2–3 weeks of active construction.

Week 9–10: Final inspection and cleanup. Municipal inspection, punch list, final cleanup.

Total timeline from “first conversation” to “ready to use”: 8–10 weeks for most projects. If you start now (mid-July), that puts completion in mid-September to early October. You’ll get at least a month of solid usable weather before things turn cold.

What’s Hard to Get Done This Late

Not everything we build is achievable on this timeline. A few situations where we’d be honest about pushing into next year:

Major multi-level decks with extensive built-ins. A 1,000+ square foot multi-level deck with built-in seating, outdoor kitchen, and pergola is a 6–8 week construction project on its own. Add the design and permit lead time, and you’re looking at completion in late October or early November. Possible, but tight.

Covered porches or sunroom-style additions. Anything with a real roof structure attached to the house requires architectural review, structural engineering in some cases, and significantly more permit time. We’d typically recommend planning these for next spring rather than rushing them.

Decks requiring significant site work. If your yard slopes dramatically, has drainage issues, or needs retaining walls before the deck can go in, the prep work alone can add weeks. These projects start to push timelines past comfortable.

Custom cedar or specialty wood decks. Specialty wood species sometimes have longer lead times than composite or pressure-treated. Available cedar timeline depends on supply at the time of order.

Anything where you haven’t made design decisions yet. If you’re still trying to decide between materials, designs, and configurations, every week of indecision pushes the start date later. This is the biggest variable.

What’s Definitely Still Possible

Most “normal” deck projects from a July start are entirely achievable:

• Standard composite or pressure-treated deck replacements
• New decks on previously undecked spaces
• Single-level or simple two-level designs
• Decks with railings, basic built-ins, and standard features
• Pergola additions to existing decks
• Most under-500-square-foot builds

If you’ve been thinking about a “normal” deck — meaning not a massive multi-level entertainment complex — you almost certainly can have it done this summer.

Why You Shouldn’t Wait Until Next Year

The “we’ll do it next year” decision feels safe, but the math usually argues for doing it now.

You lose this year’s use. A deck built in September gives you a month of immediate use this fall, then your full first season next spring. A deck postponed to next year gives you nothing for the next 8–10 months.

Material costs aren’t going down. Composite and wood pricing have been stable but elevated. There’s no realistic scenario where waiting saves you money on materials.

Spring is the busiest contractor season. April–June is when every deck builder in St. Louis is slammed. Booking in fall for spring construction often means waiting until late May or June for actual build dates, especially with reputable contractors.

Your design decisions are easier now. When you’re in the backyard in July wishing you had a deck, the decisions about size, layout, and features are concrete. By February, those instincts fade.

Permits move faster in summer. Most St. Louis-area building departments are less backed up in summer than they get in spring rush. Faster permits = faster builds.

The only reason to wait is if a specific design requires more time than this summer allows.

How to Move Fast (Without Cutting Corners)

If you want a deck this summer and you’re starting from zero, here’s the most efficient path:

Have a clear idea of what you want before the consultation. Not finalized plans — but a rough sense of size, location, material preference (composite vs. wood), and any specific features (built-in seating, pergola, fire pit area, outdoor kitchen). Going in cold means more consultation rounds before you can move forward.

Pre-research materials. Spend an hour looking at composite decking options (Trex, TimberTech, Deckorators are the main brands). Knowing your top three preferred boards going into the consultation accelerates the process.

Be available for decisions. The biggest delays during summer projects come from homeowners not being available to make decisions when needed. Make sure both decision-makers (often a couple) can review and respond to questions within 24–48 hours.

Don’t over-customize at the start. You can always add features later — pergolas attach to existing decks, fire pits and outdoor furniture come after construction, built-in lighting can be added during the electrical phase. Start with the deck structure and let phase 2 features wait if needed.

Pull permits as soon as the contract is signed. Some contractors wait until materials arrive to pull permits. That’s usually a mistake during summer rush. Permit filing should happen the same week as contract signing.

What Your Contractor Should Be Honest About

A few questions worth asking any deck builder you’re considering:

• “What’s your realistic completion timeline if we start this week?”
• “What’s your current backlog — when can construction actually begin?”
• “What’s your permit timeline experience in ?”
• “What materials do you have available now, and what would need to be ordered?”
• “What design decisions need to be made first?”

A contractor giving you confident, specific answers is showing you they actually run their business and can deliver. A contractor giving you vague or overly optimistic answers is setting you up for delays.

What Decks Cost in St. Louis in 2026

Quick refresher on realistic 2026 pricing:

• Pressure-treated deck (basic 300–400 sq ft): $15,000 – $25,000
• Composite deck (mid-range, 300–500 sq ft): $25,000 – $50,000
• Premium composite with built-ins (500+ sq ft): $40,000 – $80,000
• Multi-level or complex designs: $60,000 – $150,000+

Material choice is the biggest variable. Composite is the dominant choice now for both quality and long-term maintenance reasons — wood requires staining/sealing every 2–3 years and gets expensive to maintain over a decade.

Frequently Asked Questions

How long does the actual construction take, separate from design and permits?

For a typical 400 sq ft composite deck, 2–3 weeks of active construction once we’re on site. Smaller or simpler builds can be done in 1–2 weeks. Larger or more complex builds take 4–6 weeks.

Can you build in the rain?

Most days, yes — light rain doesn’t stop deck construction. Heavy rain delays specific tasks (concrete pours for footings, finish work). St. Louis summers are dry enough that weather delays are usually 1–3 days total across the whole project.

Can you start before permits are approved?

No, and any contractor offering to start without permits is a major red flag. Unpermitted work creates resale problems, insurance issues, and code enforcement risk.

What if I want changes during construction?

Change orders are normal but cost more than getting it right upfront. Major changes can delay completion. Minor changes (color swap, hardware change) are usually accommodatable without much disruption.

Will my deck affect resale value?

A well-built deck typically adds a solid share of its cost to resale value — generally in the 60–75% range in the St. Louis market — plus makes the home more attractive to buyers. The lifestyle value during the years you own the home is usually the bigger factor.

Let’s Talk About Your Deck This Week

If you’re seriously considering a deck this summer, the time to start the conversation is now — not in three weeks. We can have you in the design phase by next week and breaking ground in August.

Covenant Contracting builds custom decks across the St. Louis metro — Fenton, Wildwood, Ballwin, Chesterfield, St. Peters, Grover, Valley Park, and surrounding areas. Free in-home consultations, real timeline conversations, and no pressure if the timing doesn’t work for you. You can see past builds in our project gallery.

Request Your Free Deck Consultation →

Or call (314) 282-1991 to schedule this week, or explore our other services.