A deck bid is more than a price. Here is how to read each line, from footings and fasteners to permits and warranty terms, so you know exactly what you are buying.
Licensing, permit, lien and tax rules vary by state and city and change over time. This guide is general information, not legal or tax advice; check with your local building department, state licensing board or a professional for your situation.
Checklist
- A complete deck bid itemizes footings, framing, ledger connection, decking, stairs, railings, hardware, permit fees and labor instead of quoting a lump sum.
- About 90 percent of deck collapses come from ledger board connection failures, so the bid must specify bolts, flashing and proper fastening, not nails.
- Footings belong below the frost line, and the bid should state who pulls the permit and schedules inspections.
- Deck costs break down roughly as 38 percent substructure, 30 percent decking and railing labor, 20 percent decking materials and 12 percent railing materials.
- Compare at least three bids written to the same specifications, and get payment terms, exclusions and warranty coverage in writing.
A deck looks simple from the yard: boards, posts, rails. The bids on your kitchen table will not match each other. One bid spells out footings, hardware and permit fees; another says “deck, 320 square feet” and a lump sum for the same 16 by 20 deck, thousands of dollars apart. Here is how to read a deck bid line by line before you sign.
A Complete Scope of Work on Paper
First check whether the bid describes the actual job. A written scope of work should state the deck’s dimensions, height above grade, number of levels and layout, and match what you discussed during the consultation. A professional estimate then itemizes the major parts of the build: concrete footings, posts, beams, joists, the ledger connection, decking, stairs, railings, hardware and finishing.
Detail matters because the opposite invites trouble: a vague estimate with three or four lines and a lump sum gets compared on price alone, and the cheapest bidder often wins by cutting corners on structural work. Labor should be broken out separately from materials, and permit and inspection fees should appear as their own line item. Ask every bidder one direct question: what triggers additional charges after we sign? The answer, in writing, tells you how the whole project will run.
Materials Named, Not Just Described
The materials section should name the specific decking, whether pressure-treated lumber, composite, PVC or hardwood, along with grade, brand where applicable, and color. Phrases like “standard wood” or “composite decking” are red flags: the real product you pick later costs more than the placeholder.
Deck cost guides put pressure-treated pine at roughly $3 to $6 per square foot, composite decking at $5 to $14, and dense hardwoods such as Ipe at $10 to $20. Labor commonly adds $8 to $22 per square foot depending on location, design and season. A 2026 contractor pricing guide puts a 16 by 20 pressure-treated deck at about $45 per square foot, roughly $14,500, and the same size composite deck at about $60 per square foot, roughly $19,100.
Here is how the money in a deck bid generally breaks down:
| Cost component | Share of project cost |
|---|---|
| Substructure materials and labor | 38% |
| Decking and railing labor | 30% |
| Decking material and fasteners | 20% |
| Railing material | 12% |
The frame, not the boards, is the biggest share. Wood decking also carries maintenance and repair costs after the project ends; composite trades a higher upfront price for less upkeep.
Footings, Frost Depth and Permit Responsibility
Footings and posts are the part of the deck you will never see, which makes them the easiest place for a low bidder to save money. The bid should specify the number and size of footings and the depth. Footings belong below the frost line, generally about 6 inches deeper than it; frost lines run around 42 inches in cold climates and around 12 inches in warmer ones. Your local building code sets the exact requirement, so have the bidder cite it rather than guess.
The bid should also say who pulls the permit. If the contractor handles it, expect the permit fee, any administrative charge and inspection scheduling in writing. Some areas require permits and inspections for deck work; that cost should not surface as a surprise halfway through. Rules vary by city and county, so confirm with your local building department. Our guide explains whether you need a building permit and how the process usually works.
Hardware, Fasteners and Framing Details That Affect Price
The ledger board, the framing that attaches the deck to your house, is the most important line in the bid. The North American Decking and Railing Association estimates that about 90 percent of deck collapses result from ledger connection failures, most of them from improper fastening, especially ledgers attached with nails only. Nails bend and pull out over time. If nail heads are the only visible hardware holding a deck to a house, treat it as unsafe.
A serious bid specifies the ledger connection: structural screws or bolts, not nails, plus the flashing and anchors that keep water out of the joint where the deck meets the house. Fastener quality shows up elsewhere too; stainless steel screws resist corrosion and cost more than bargain alternatives, money well spent outdoors. Resist any suggestion to save on the frame. The substructure is the largest cost share and the part inspectors scrutinize, and trimming it is how a cheap bid becomes a dangerous deck.
Railings, Stairs and Code Requirements
Railings and stairs are code items, not design choices. In many cases a deck more than 18 inches off the ground requires a railing and stairs to meet code, and stair systems on older decks frequently fail to meet current requirements when rebuilt. Your bid should describe the railing system by type and material, because the price gap is wide: pressure-treated wood railings cost far less than cable or composite systems, and a generic “railing allowance” hides that choice until it is time to pay.
Walk the layout with the bidder. Count railing sections, confirm stair width and riser count, and note any built-in seating or lighting, since accessories move the total. If one bid comes in well under the others, check whether it priced a thinner railing system or fewer stair details before assuming it is a bargain.
Payment Schedule, Timeline and Change Orders
Payment terms, timeline and exclusions belong in the written bid, not in a verbal promise. The schedule should include padding for rain and material delays rather than promise an early finish with no cushion. Tie payments to completed milestones rather than calendar dates, keep the deposit modest, and never let the schedule front-load so much money that you have no hold on the contractor if work stalls. If the project drags or the relationship sours, lien rules can come into play; our guide to mechanic’s liens and lien waivers explains how to avoid paying twice for the same work.
Every change after signing should be a written change order with its price agreed before the work happens. That paper trail prevents the most common dispute: two people remembering the conversation differently. For the terms your agreement should contain, see what a home improvement contract should say.
Tip
Get at least three quotes, then hand every bidder the same written material list and layout. Bids priced on identical specifications are the only ones you can compare line by line.
Warranty, Exclusions and Cleanup Terms
The last pages of a good bid cover what happens after the last board goes down. Look for warranty terms for both materials and labor, stated plainly, along with what the warranty does not cover. Exclusions deserve equal attention: landscaping repair, grading and anything below the deck surface are commonly left out.
Cleanup should be explicit too. Debris removal, dumpster rental and disposal costs are real line items, and a bid that silently omits them leaves you with a pile of treated lumber and a bill. Check how long the price is valid; 30 days is a common window. Before you sign, verify credentials: our guide to checking a contractor’s license walks through verifying licensing and insurance in your state.
Keep reading
- What a Home Improvement Contract Should Say: the payment, warranty and change order terms your deck contract should contain.
- Do You Need a Building Permit?: how permit requirements work and why they vary by location.
- Remodeling Cost Terms to Know Before You Get Bids: plain definitions for allowances and other bid language contractors use.
Homeowners ask
How detailed should a deck building bid be?
Detailed enough to cover roughly 30 line items, including footings, framing, decking, stairs, railings, hardware, finishing, permit fees and labor. A bid with three or four lines and a lump sum makes it impossible to compare offers or hold the contractor to anything.
What does a new deck cost?
Cost guides put a small to mid-size composite or PVC deck with a simple rectangular layout at roughly $10,000 to $30,000, with larger or multi-level premium builds running well beyond that. Material prices range from about $3 to $6 per square foot for pressure-treated wood to $5 to $14 for composite, and labor often adds $8 to $22 per square foot depending on location and complexity.
Who should pull the permit for a deck build?
Many homeowners ask the contractor to handle the permit, and if so the bid should list the permit fee and inspection scheduling as their own line items. Requirements vary by city and county, so confirm with your local building department before signing.
What is the biggest red flag in a deck bid?
Vague material descriptions such as ‘standard wood’ or ‘composite decking,’ and a ledger connection specified with nails only. Nailed-only ledgers are a leading cause of deck collapses, and vague material lines make the bid look cheaper than the finished project will be.