Building a Deck in the Chicago Suburbs: What Homeowners Need to Know

Thinking about adding a deck to your backyard? You're not alone. In the suburbs of Chicago, a well-built deck is one of the most popular outdoor upgrades — creating extra space for grilling, relaxing, and spending time with family.

But before you start buying lumber or calling contractors, here’s what you really need to know — from building codes to budget and local climate.

Clarify How You’ll Use Your Deck

Before choosing the size, design, or materials, ask yourself:

• Hosting guests? → You’ll need space for a table, seating, and maybe even lighting.

• Quiet mornings with coffee? → Think smaller size, privacy screens, cozy layout.

• Kids playing? → Plan for railings, shade, and soft edges.

A clear purpose helps you avoid overbuilding or spending on features you won’t use.

Know the Local Building Requirements

In most Chicago suburbs — like Palatine, Arlington Heights, Mount Prospect, or Schaumburg — permits are required for decks that are:

• Attached to the home

• Elevated more than a few feet

• Over a certain square footage

• Built with footings or support posts

You’ll likely need to submit:

• A site plan with property lines

• Construction drawings

• Materials list

• Application fee (usually $75–$150)

• Pass inspections at foundation and final stages

Pro tip: Submit early — permits can take 2–4 weeks during peak season.

Match Your Deck to the Yard

Not every backyard is deck-ready without planning. Consider:

• Sun vs. shade: West-facing decks get very hot in summer

• Drainage: Low or sloped spots may need grading or gravel

• Privacy: Don’t position your deck right next to your neighbor’s windows

• Trees: Avoid placing decks over large roots or deep shade (can cause mildew)

In many Chicago-area homes, decks built on the south or east side of the house get the best light balance.

Compare Wood and Composite Materials

Material	Pros	Cons
Pressure-treated wood	Affordable, easy to find	Needs sealing every 1–2 years
Cedar or redwood	Naturally resists rot	Higher cost, still needs care
Composite (e.g., Trex)	Long-lasting, low-maintenance	Expensive, hot in full sun

Already shopping for materials? Check out our Best Wood for Outdoor Structures guide to avoid rot and wasted money.

Understand the Structural Basics

Every safe deck starts with strong support. Main components include:

• Footings (42" deep in northern IL due to frost line)

• Posts and beams (carry the load)

• Joists (typically spaced 16" apart)

• Decking (the surface you walk on)

• Hardware (use only galvanized or stainless steel for outdoors)

Don’t skimp on structural elements — they’re often what make or break your inspection.

Plan for Realistic Costs

Estimated project costs in the suburbs:

• Basic 200 sq. ft. wood deck: $4,000–$7,000

• Mid-size cedar deck: $10,000–$18,000

• Composite deck with extras: $20,000–$35,000+

Include:

• Permit fees

• Old deck removal (if needed)

• Railings, stairs, fascia

• Outdoor lighting, planters, furniture

• Add 10–15% buffer for surprises (like extra posts or delivery delays)

Know What Maintenance You’re Signing Up For

Chicago’s four seasons mean decks need regular care:

• Sweep debris and leaves

• Power-wash annually

• Seal wood decks every 1–2 years

• Inspect for rot, nails, and splinters

Composite decks need less maintenance — but still benefit from seasonal cleaning.

Why Building a Deck in the Chicago Suburbs Requires Extra Planning 

The local climate and regulations affect your deck more than you think:

• Frost line is deeper — requires deeper footings

• Snow load rules impact beam sizing

• Clay soil affects drainage

• HOAs may require approvals

• Close neighbors → privacy screens or noise mitigation may be helpful

Replacing an Old Deck?

Even if you're keeping the old frame:

• Check code compliance (older decks often aren't)

• Inspect for hidden rot before reinstalling decking

• Permits may still be required

Rule of thumb: don’t reuse anything unless a pro has inspected it.

Final Thoughts

Building a deck in the Chicago suburbs isn’t just about looks — it’s about planning smart from the start. Between permits, seasonal wear, and material choices, a little prep goes a long way.