Skip to content
ContractorsRanked

How much does a new deck cost in Longmont, CO?

Regionally adjustedUpdated Prices checked October 20262 sources

In Longmont, a new deck typically runs $4,340 to $12,650, about $8,320 for a typical job. That is the US national range from HomeAdvisor ($4,338 to $12,653) adjusted by the Mountain factor of 1.00 from the 2025 Cost vs. Value Report. Checked October 2026.

Adjusted for the Mountain region

Low
$4,340
Typical
$8,320
High
$12,650

Get deck building quotes in Longmont

Deck building cost in Longmont, CO

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

Deck building cost in Longmont, CO
EstimateLowTypicalHighBasisChecked
Mountain estimate$4,340$8,320$12,650National range × 1.00: the Mountain / national cost ratio for “Deck Addition | Wood” ($18,253 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 Longmont

Permit note

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

Rules are set locally; confirm with Longmont’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.

Get deck building quotes in Longmont

Tell us about the job and we will pass it to local pros. Asking for quotes never changes how we rank anyone.

Two short steps: your name, then how to reach you. Free, and it never changes anyone’s rank.

Top-ranked deck builders in Longmont

The top 3 of 141 deck builders we rank for Longmont, CO, by CR Score. Paid placement never changes rank.

  1. #1
    Decks By Caio
    CR Score 605.0from 89 Google reviews
  2. #2
    Blue Vista Landscape & Design
    CR Score 604.8from 38 Google reviews
  3. #3
    O'Keefe Built
    CR Score 604.8from 88 Google reviews

See all ranked deck builders in Longmont

Deck building cost in Longmont: questions

How much does a new deck cost in Longmont, CO?

In Longmont, a new deck typically runs $4,340 to $12,650, about $8,320 for a typical job. That is the US national range from HomeAdvisor ($4,338 to $12,653) adjusted by the Mountain factor of 1.00 from the 2025 Cost vs. Value Report. Checked October 2026.

Why is the Longmont price different from the national price?

The 2025 Cost vs. Value Report puts the “Deck Addition | Wood” project at $18,253 in the Mountain division against $18,263 nationally, a factor of 1.00. We apply that factor to the national range. It is a division-level adjustment, not a Longmont price survey.

Do I need a permit for a new deck in Longmont?

Most places require a deck permit, typically $230 to $500 depending on location, size and height. Rules are set locally, so confirm with Longmont’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 Longmont?

We rank 141 deck builders for Longmont, CO 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, Mountain division · checked October 2026Used for: Regional factor 1.00 for “Deck Addition | Wood”.
These are published estimates with a documented regional adjustment, checked October 2026. They are not quotes. Typical range shown: $4,340 to $12,650. Editorial policy

Related pages

More cost guides for Longmont