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How much does a new deck cost in Rock Falls, IL?

Regionally adjustedUpdated Prices checked October 20262 sources

In Rock Falls, a new deck typically runs $4,300 to $12,530, about $8,240 for a typical job. That is the US national range from HomeAdvisor ($4,338 to $12,653) adjusted by the East North Central factor of 0.99 from the 2025 Cost vs. Value Report. Checked October 2026.

Adjusted for the East North Central region

Low
$4,300
Typical
$8,240
High
$12,530

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Deck building cost in Rock Falls, IL

Each row says exactly what the figures are and where they come from.

Deck building cost in Rock Falls, IL
EstimateLowTypicalHighBasisChecked
East North Central estimate$4,300$8,240$12,530National range × 0.99: the East North Central / national cost ratio for “Deck Addition | Wood” ($18,090 vs $18,263) in the 2025 Cost vs. Value ReportOctober 2026
US national range$4,338$8,321$12,653Per deck: typical range of customer-reported projects (HomeAdvisor)October 2026

Deck building cost by type or size

US national figures in USD, as published by each source.

Deck building cost by type or size
Type or sizePrice (USD)Source
10 × 10 ft (100 sq ft)$4,000 to $6,000HomeAdvisor
20 × 20 ft (400 sq ft)$16,000 to $24,000HomeAdvisor

What drives the cost of a new deck

  1. Size and height

    Second-story and multi-level decks need more structure.

  2. Decking material

    Pressure-treated wood runs $2 to $5 per sq ft; composite $12 to $22.

  3. Labor

    Labor runs $15 to $35 per sq ft.

  4. Railings and stairs

    Railings cost $35 to $210 per linear foot.

  5. Old deck removal

    Demolition runs $5 to $15 per sq ft.

  6. Season

    Off-season work can be up to 20% cheaper.

Permits and what's included in Rock Falls

Permit note

Most places require a deck permit, typically $230 to $500 depending on location, size and height.

Rules are set locally; confirm with Rock Falls’s building department.

What’s usually included

  • Footings and framing
  • Decking boards
  • Railings and stairs in the agreed design
  • Installation labor

Scopes vary. Get the scope in writing on every quote.

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Top-ranked deck builders in Rock Falls

The top 3 of 10 deck builders we rank for Rock Falls, IL, by CR Score. Paid placement never changes rank.

  1. #1
    Elite Painting and Renovation
    CR Score 564.7from 15 Google reviews
  2. #2
    Hammer Time Custom Carpentry
    CR Score 554.7from 13 Google reviews
  3. #3
    B&A Glass Co.
    CR Score 513.8from 13 Google reviews

See all ranked deck builders in Rock Falls

Deck building cost in Rock Falls: questions

How much does a new deck cost in Rock Falls, IL?

In Rock Falls, a new deck typically runs $4,300 to $12,530, about $8,240 for a typical job. That is the US national range from HomeAdvisor ($4,338 to $12,653) adjusted by the East North Central factor of 0.99 from the 2025 Cost vs. Value Report. Checked October 2026.

Why is the Rock Falls price different from the national price?

The 2025 Cost vs. Value Report puts the “Deck Addition | Wood” project at $18,090 in the East North Central division against $18,263 nationally, a factor of 0.99. We apply that factor to the national range. It is a division-level adjustment, not a Rock Falls price survey.

Do I need a permit for a new deck in Rock Falls?

Most places require a deck permit, typically $230 to $500 depending on location, size and height. Rules are set locally, so confirm with Rock Falls’s building department.

What affects the cost of a new deck?

Size and height: second-story and multi-level decks need more structure. Decking material: pressure-treated wood runs $2 to $5 per sq ft; composite $12 to $22. Labor: labor runs $15 to $35 per sq ft. Railings and stairs: railings cost $35 to $210 per linear foot.

How many deck builders serve Rock Falls?

We rank 10 deck builders for Rock Falls, IL by CR Score. Get at least three written quotes for the same scope.

What is usually included in the price?

Footings and framing; Decking boards; Railings and stairs in the agreed design; Installation labor. Always get the scope in writing on the quote.

Sources

Checked October 2026. Figures are estimates, not quotes.

  1. HomeAdvisor: Deck building cost · page updated June 17, 2026 · checked October 2026Primary source. Used for: Low, typical and high; prices by size; drivers; permit.
  2. Journal of Light Construction: 2025 Cost vs. Value Report: Deck Addition, Wood · page updated 2025 · checked October 2026Used for: Regional adjustment ratio.
  3. Journal of Light Construction: 2025 Cost vs. Value Report, East North Central division · checked October 2026Used for: Regional factor 0.99 for “Deck Addition | Wood”.
These are published estimates with a documented regional adjustment, checked October 2026. They are not quotes. Typical range shown: $4,300 to $12,530. Editorial policy

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