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Decision Tool · Same-Scope Comparison

Deck Quote Comparison Checklist

A printable decision worksheet designed to normalize contractor bids. Never compare contractor price per square foot until every underlying line item—from framing and frost footings to railings, stairs, and permits—is verified on an identical scope.

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Updated: 2026-11-04 • Standard Form V1.0 • Zero Referral Affiliation
The Golden Rule: Compare $/sq ft ONLY where scope is identical.

A quote showing $28 per square foot is not cheaper than a quote showing $35 per square foot if the lower quote excludes municipal permit filings, concrete frost-line footings, perimeter guardrails, stair landings, or old deck demolition. Unbudgeted change orders on omitted scope can easily erase apparent upfront savings and push the final cost well above competing turnkey bids.

Use the 5-point checklist below to verify that all three contractor proposals provide matching specifications before comparing bottom-line numbers.

1. Baseline Project Specifications Record once before gathering quotes

Finished Dimensions: _____ ft × _____ ft
Finished Usable Area: __________ sq ft
Height Above Grade: _____ inches
Substructure Scope: [   ] 100% New   [   ] Resurface

2. Same-Scope Verification Checklist (3-Quote Audit)

Scope Item & Specification What to Verify (Same-Scope Benchmark)
Quote 1
Contractor A
Quote 2
Contractor B
Quote 3
Contractor C
Group A: Dimensions, Elevation & Framing Structure
Dimensions & Finished Area Quote is based on exact usable walk surface square footage, not rough lumber footprint. [   ] sq ft [   ] sq ft [   ] sq ft
Elevation & Grade Clearance Platform height above grade recorded correctly. Structures >30" require guardrails and deep frost piers. [   ] _____ in [   ] _____ in [   ] _____ in
Retained vs. New Framing Explicitly states 100% new joists, beams, and ledger board vs. reusing existing framing. Resurfacing requires joist integrity certification. [   ] New / Re [   ] New / Re [   ] New / Re
Joist Spacing & Lumber Grade Joist centers verified against manufacturer span table (e.g. up to 16" O.C. standard perpendicular, 12" O.C. for diagonal layouts or high-traffic composite specifications). Pressure-treatment grade specified (Ground Contact UC4A vs. Above Ground UC3B). [   ] ___" O.C. [   ] ___" O.C. [   ] ___" O.C.
Ledger Board & Flashing Code-approved structural ledger fasteners (LedgerLOK or ½" hot-dip galvanized bolts), butyl joist tape, and metal Z-flashing beneath house siding. [   ] Yes / No [   ] Yes / No [   ] Yes / No
Group B: Deck Board Product Line, Fasteners & Fascia Scope
Decking Manufacturer & Line Exact brand and model tier named (e.g. Trex Enhance vs. Select vs. Transcend; TimberTech Prime+ vs. Legacy; #1 vs. #2 PT Pine; Western Red Cedar heartwood). [   ] Tier: ____ [   ] Tier: ____ [   ] Tier: ____
Fastener System Specification Specifies hidden clip system (grooved boards) vs. color-matched face screws with plugs vs. standard exterior screws. 305/316 stainless steel required within 15 miles of coastal salt spray. [   ] Hidden/Face [   ] Hidden/Face [   ] Hidden/Face
Fascia & Rim Wrap Scope Perimeter rim joists and stair stringers wrapped in matching composite fascia trim boards vs. leaving pressure-treated structural framing exposed. [   ] Wrapped [   ] Wrapped [   ] Wrapped
Group C: Concrete Footings, Railing Length & Stair Scope
Concrete Pier Footings Quantity, diameter, and depth below local municipal frost line (e.g., 36"–48" in Sonotubes) vs. shallow precast surface blocks. Pre-pour inspection included. [   ] ___" Frost [   ] ___" Frost [   ] ___" Frost
Safety Railing Length & Material Exact linear footage of guardrail and material tier (wood 2×2 pickets vs. aluminum balusters vs. continuous composite top rail vs. horizontal stainless cable). [   ] ___ LF [   ] ___ LF [   ] ___ LF
Staircase & Landing Scope Total riser/tread count, stair width (min 36"), continuous graspable handrails (where required for 4+ risers), and stable landing pad at base (concrete slab, pavers, or frost footings per local building code). [   ] ___ steps [   ] ___ steps [   ] ___ steps
Group D: Demolition, Disposal, Permits, Access & Tax Scope
Demolition & Haul-Away Tear-down of existing structure, roll-off dumpster rental fees, landfill tipping charges, and property haulage included in contract total. [   ] Included [   ] Included [   ] Included
Building Permits & Drawings Contractor pulls permit as licensed professional, prepares structural plan drawings, pays municipal application fees, and attends inspections. [   ] Included [   ] Included [   ] Included
Site Access & Lawn Protection Machine vs. hand-digging surcharges, narrow gate access, ground protection mats, post-construction clean-up, and underground utility marking (Call 811). [   ] Included [   ] Included [   ] Included
Taxes & Administrative Fees Local material sales taxes, contractor excise fees, and payment processing surcharges clearly accounted for in total (no surprise additions). [   ] Included [   ] Included [   ] Included
Group E: Workmanship Warranty & Price Validity Date
Workmanship Warranty Duration Contractor labor callback guarantee stated in writing (minimum 1 to 2 years for framing sag, loose boards, or railing wobble). [   ] ___ yrs [   ] ___ yrs [   ] ___ yrs
Manufacturer Material Warranty Verifies manufacturer warranty terms (standard 25–50 year limited fade/stain coverage) and confirms whether contractor holds manufacturer certification required for extended labor-warranty registration tiers. [   ] Certified [   ] Certified [   ] Certified
Quote Expiration / Lock Date Quote specifies pricing expiration date (typically 14 to 30 days due to lumber and composite resin commodity price volatility). [   ] Valid: ___ [   ] Valid: ___ [   ] Valid: ___

3. Bottom-Line Scope Normalization & Rate Calculation

If a quote omitted an item above, add the estimated out-of-pocket cost below before comparing rates.

Rule: Compare $/sq ft only when scope is identical
Calculation Metric Quote 1 (Contractor A) Quote 2 (Contractor B) Quote 3 (Contractor C)
Raw Quoted Total (as submitted) $ ____________ $ ____________ $ ____________
Finished Measured Area _______ sq ft _______ sq ft _______ sq ft
Raw Price Per Sq Ft (Total ÷ Area) $ ______ / sq ft $ ______ / sq ft $ ______ / sq ft
Scope Add-Backs for Omitted Items (Permits, footings, tear-off, stairs, etc.) + $ __________ + $ __________ + $ __________
Normalized Same-Scope Total
Raw bid + all omitted scope costs
 $ ____________ $ ____________ $ ____________
Normalized Price Per Sq Ft
Only valid comparison metric
 $ ______ / sq ft $ ______ / sq ft $ ______ / sq ft

Three Most Common Deck Quote Traps Homeowners Encounter

1. The “Homeowner Pulls Permit” Clause

Verify who is named as the permit applicant of record. While property owners can lawfully pull permits on their own property, building authorities (such as Fairfax County LDS) recommend that licensed contractors pull the permit. Having the contractor serve as applicant of record establishes them as the party responsible for plan drawings, structural code compliance, and inspection sign-offs.

2. The 16" O.C. Composite Deflection Sag

Verify joist spacing against the manufacturer's published span tables. Official guidance from manufacturers such as Trex confirms that standard perpendicular installations allow up to 16" on-center joist spacing, while diagonal decking (e.g. 45° angles) requires 12" on-center framing. Confirm your contractor's framing plan matches the exact span ratings for your selected decking product line.

3. Excluded Landings & Handrail Details

Residential building codes (IRC R311.7) mandate a solid, stable landing pad at the bottom of exterior stair stringers—they cannot rest on bare soil or lawn turf. If a contractor quote excludes the bottom landing pad (concrete slab, pavers, or footings based on local frost depth) or graspable handrails, clarify in writing whether these elements are included or will trigger additional charges before final code approval.

Educational Decision Tool Disclaimer: Costimated is an independent construction cost intelligence publisher. This checklist is designed to help homeowners evaluate contractor bids on an identical scope of work. Figures generated by the Costimated estimating engine are statistical planning benchmarks based on BLS wage data and retail material indices, not contractor guarantees or engineering approvals.

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