Cost · permit · scope
Deck planning guide
Plan a deck with area and joist calculations, material comparisons, permit checkpoints, quote controls, and a contractor-ready scope.
Permit complexity
Medium
Compare quotes per
square foot of deck
| Percentile | U.S. | California | Texas |
|---|---|---|---|
| 25th percentile | $23.32 | $28.72 | $21.48 |
| Median | $29.12 | $36.50 | $23.51 |
| 75th percentile | $36.94 | $46.07 | $27.78 |
Deck buying path
Separate the structure from the surface.
Decking color is visible; footings, beams, joists, attachment, guards and stairs are what make two similar-looking quotes materially different.
01 · Measure
Fix the geometry
Record length, width, maximum walking-surface height and stair locations. On a sloped yard, the controlling height may be at one edge.
02 · Structure
Choose the load path
Describe the concept as ledger-attached or freestanding and keep footings, framing, guards and stairs separate from the finish surface.
03 · Normalize
Compare the same layers
Require each bidder to identify structure, decking, railing, demolition, permit drawings and engineering as included or excluded.
Decision matrix
Compare one specification at a time
Pressure-treated
A conventional entry-cost path
Specify lumber grade, treatment, drying expectations, fasteners and finish allowance.
Cedar
Natural appearance with a wood system
Specify grade, board profile, fastening method, finish and maintenance assumptions.
Composite
A manufactured surface system
Specify product line, hidden fasteners, fascia, heat/color choice and warranty labor terms.
Quote controls
Keep every bid comparable
- Same plan dimensions and maximum height above grade
- Footings, framing and attachment priced separately from decking
- Guards, stairs, fascia and lighting explicitly included or excluded
- Permit drawings, engineering and inspection coordination assigned
Next best action
Calculate, then lock the scope.
Work out joists and decking for your footprint in the deck calculator, then carry the same size, height and attachment into a brief before contractors quote.
Start with two separate questions
Commonly required when the walking surface is elevated, attached, or over a stated size. Ground-level platforms may be exempt — locally.
Decks often must respect the same yard setbacks as the house, with some cities allowing a limited encroachment for uncovered decks.
What usually decides the scope
- Walking surface height above grade
- Attached to the house or freestanding
- Covered or open
- Stair and guardrail requirements
- Ledger flashing and lateral loads
Height above grade
A widely used residential pattern (from model codes, not your city) is that walking surfaces more than 30 inches above grade need guards — and often a building permit. Measure from finished grade to the walking surface.
Attachment
A ledger-attached deck loads the house. Many building departments want details: flashing, fasteners, and lateral tension ties. Freestanding decks can still need permits; they just change the engineering conversation.
Coverage
Adding a roof, pergola, or screen room on a deck can reclassify the project and trigger setbacks that a simple platform did not.
From research to quotes
Give every bidder the same scope.
Set the size, height above grade and decking, and say whether the deck is attached or has stairs. The brief adds joist lines and decking courses, and asks each bidder to split footings, framing, decking, railing and stairs on the quote. No contact details needed; sending it on is optional.
Create deck briefUse the dimensions, not a guess
Related field notes
- Deck Railing Height, Stair Rules and Baluster Spacing
- Fire Pit Rules: Distance From the House, Permits and Open Burning
- How a Building Permit Works: Final Inspection, Expiry and Owner-Builders
- Deck Joist and Beam Span Tables, by Lumber Size
- Deck Footing Size and Post Height Tables
- Building Permit Cost and Time: Fees in Austin and Los Angeles