Free Deck Estimate Template
A complete, line-item deck estimate you can preview below — footings and posts, ledger and flashing, framing, decking, guardrail and stairs — plus the IRC R507 checklist that covers the ledger and guard details inspectors fail most often.
| Line item | Qty | Amount |
|---|---|---|
| Concrete footings & post bases (48in depth) | 8 | $1,240.00 |
| Pressure-treated framing — beams, joists, hangers | 320 sq ft | $2,180.00 |
| Ledger board, flashing & 1/2in lag hardware | 20 lf | $390.00 |
| Composite decking & hidden fasteners | 320 sq ft | $3,520.00 |
| Guardrail — posts, top rail, balusters (36in) | 44 lf | $1,760.00 |
| Stairs — stringers, treads, handrail (4 risers) | 1 | $680.00 |
| Labor — carpentry crew | 56 hrs | $3,360.00 |
| Permit & inspection | 1 | $285.00 |
| Total | $13,415.00 | |
Payment schedule
How to measure and price deck work
- Price the deck surface per square foot and the railing and stairs per linear foot / per flight — they are the biggest cost drivers after framing.
- Count footings from the beam layout; frost-depth footings in cold climates can double this line.
- Composite decking typically runs 2–3x pressure-treated material cost; always show the decking product by name.
Deck building-code guide
Deck collapses are almost always ledger failures. The IRC added a full deck section (R507) for exactly this reason — here is what it requires.
- Ledger must be nominal 2x lumber, at least as deep as the deck joists
- Attach with 1/2in lag screws or through-bolts and washers — NEVER nails alone, and never into siding
- Remove the siding first; the lag tip must fully pass the inside face of the band joist
- Flashing over the ledger is REQUIRED (R703.4) — no flashing means rot and eventual collapse
- Footings bear on undisturbed soil, min 12in deep AND below the local frost line (up to 48in+ in cold states)
- Footing size comes from Table R507.3.1 based on tributary area and soil bearing capacity
- 4x4 posts: max 10 ft tall; 6x6 posts: max 18 ft; posts need positive connection to footing and beam
- Joist and beam spans come from Tables R507.5 and R507.6 based on species, size and spacing
- Cantilever max 1/4 of the joist span; beam cantilever max 1/4 of the beam span
- Each deck board gets two 8d threaded nails or two #8 screws at every support
- Guard required when the walking surface is more than 30in above grade; min 36in tall (many cities require 42in)
- A 4in sphere must not pass through the guard; 6in at the triangle under the bottom stair rail
- Stairs: max 7-3/4in rise, min 10in tread, max 3/8in variation between the tallest and shortest riser
- Handrail required with 4 or more risers, 34in–38in high, graspable profile
Code quick reference — Deck
| Item | Requirement | Code reference |
|---|---|---|
| Ledger attachment | Through-bolts/lags per table, flashed above | IRC R507.9 |
| Guard height | 36in min when walking surface > 30in above grade | IRC R312.1 |
| Baluster gap | 4in sphere cannot pass | IRC R312.1.3 |
| Stair rise/run | 7-3/4in max rise, 10in min tread | IRC R311.7 |
| Footings | Below frost line, sized per load table | IRC R403.1.4 |
| Lateral load | Hold-down devices at ledger connection | IRC R507.9.2 |
Drawings & details
Simplified section and plan views of the details inspectors look at most. Illustrative only — not to scale.
Adjust the values — the drawing below updates in real time.
- 1 · Member thickness — Guard 36in min · baluster gap < 4in(1.50")
- 2 · On-center spacing — 16in OC typical(16.00" OC)
- 3 · Member length — Plate to plate(8' 0")
- 4 · Overall run — Total covered by this layout(8' 1 8/16")
- On-center spacing: 16.00" · 7 members
- Overall run: 8' 1 8/16" · Member length: 8' 0"
- Guard 36in min · baluster gap < 4in
Adjust the values — the drawing below updates in real time.
- 1 · Depth below grade — Below frost line(36.00")
- 2 · Footing width — Footing per load table(16.00")
- 3 · Height above grade — 6x6 post + base(3' 0")
- Depth below grade: 36.00" · Footing width: 16.00"
- Height above grade: 3' 0"
- Below frost line
Inspection-day checklistShow
- Footing holes open and measured before concrete (schedule the footing inspection).
- Ledger flashing visible with fasteners in the correct pattern.
- Joist hangers fully nailed with structural connector nails, not roofing nails.
- Guard post connections blocked and bolted, not just lag-screwed into the rim.
- Stair stringer, handrail graspability and landing checked.
Code references are based on the 2021 IRC and related model codes. Local amendments, state codes and manufacturer instructions can be stricter — always confirm with your local building department before starting work.
Common deck estimating mistakes
- Forgetting the ledger flashing and hardware line, which is small money but the top liability item.
- Underestimating railing — a 44 lf composite rail can cost more than the framing.
- Omitting demolition and disposal of an existing deck.
Export a branded, client-ready PDF or send a sign-from-phone link.
Your client reviews and signs the estimate from any device.
IRC R507 guidance for ledger attachment, footings, spans, guards and stair geometry.
Deck estimate FAQ
What should a deck estimate include?
A deck estimate should list footings and posts, ledger board with flashing and hardware, framing (beams, joists, hangers), decking material, guardrail, stairs and handrail, labor hours, the permit and inspection, and demolition of any existing deck.
How do you price a deck job?
Deck work is normally priced per square foot of deck surface for framing and decking, plus per linear foot of railing, per footing, and per stair flight. Material choice (pressure-treated vs composite) drives most of the price difference.
What building code applies to decks?
IRC section R507 covers decks: ledger attachment, footing depth and size, post heights, joist and beam spans, and decking fasteners. R312 covers guards (36in minimum, 4in sphere rule) and R311.7 covers stairs and handrails.
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