A homeowner in Boca Raton recently received two estimates for a 500-square-foot deck. Both contractors walked the same backyard, measured the same footprint, and left with the same general understanding of the project. The estimates came back $22,000 apart. This is not unusual. In fact, it's one of the most common questions we hear: why is one deck estimate so much cheaper than another? The honest answer is that the estimates probably aren't for the same deck.
The 500-Square-Foot Example
For this article, we'll use a hypothetical 500-square-foot deck on a single-family home in South Florida. The homeowner wants composite decking, a cable railing system, and stairs to the yard. Two contractors submit written estimates. Contractor A comes in at $68,000. Contractor B comes in at $46,000. Both say "composite deck with cable railing and stairs." The homeowner is understandably wondering whether Contractor A is overcharging, or whether Contractor B is cutting corners. The answer requires looking at what each estimate actually includes — and that requires asking specific questions. Note: these figures are illustrative only and do not represent Deckmasters pricing for any specific project.
Note on figures: The $68,000 and $46,000 estimates above are illustrative only. They are used to demonstrate how scope and specification differences create price variation. They do not represent Deckmasters pricing for any specific project. Actual project costs vary based on scope, materials, site conditions, and other factors.
Material Selection Is Usually the Biggest Variable
"Composite decking" is not a single product. It's a category that spans entry-level boards at roughly $4–6 per linear foot to premium PVC products at $12–18 per linear foot or more. On a 500-square-foot deck, that difference alone can account for $8,000–$15,000 in material cost before a single board is installed. The same applies to framing. Pressure-treated lumber framing at 16-inch joist spacing costs less than steel framing at 12-inch spacing with blocking. Both may be structurally adequate for the project — but they perform differently over 20 years in a coastal Florida environment. Ask each contractor to specify the exact manufacturer, product line, and board profile they are quoting. If one says "TimberTech" and the other says "TimberTech," ask which product line — there are several, at meaningfully different price points.
Fasteners and Hardware
Hidden fastener systems cost more than face screws. Stainless steel hardware costs more than standard galvanized. In a coastal environment with salt air and humidity, the difference in hardware specification can determine whether your deck's framing connections are sound in year 15 or showing corrosion in year 8. On a 500-square-foot deck, the difference between standard and stainless hardware might be $1,500–$3,000. It's not the largest line item, but it's one that's easy to omit from a lower estimate without the customer noticing.
Engineering and Permits
Depending on the project scope, height, and jurisdiction, engineering drawings and building permits may be required. A complete estimate that includes engineering, permit fees, and inspection coordination is a different scope from one that excludes these responsibilities. In South Florida, permit fees and engineering for a residential deck can range from a few hundred dollars to several thousand, depending on the municipality and project complexity. An estimate that excludes these costs will be lower — but the homeowner will still need to pay them, either directly or through a change order. Ask each contractor directly: are engineering and permitting included in this estimate? If not, what is the expected cost, and who is responsible for obtaining them?
Demolition and Disposal
If you have an existing deck that needs to come down before the new one goes in, demolition and disposal is a real cost. Some contractors include it in their base estimate. Others treat it as a separate line item or exclude it entirely. On a 500-square-foot deck, demolition and disposal of an existing structure might add $2,000–$5,000 to the project cost. If Contractor A includes it and Contractor B does not, that explains part of the price difference — but only if you know to look for it.
Scope Exclusions You Might Not Notice
Common items that may or may not be included in a deck estimate: fascia and trim boards, post wraps, lighting, stairs beyond a basic configuration, railings beyond a basic configuration, concrete footings versus helical piers, site restoration after construction, and final cleanup. A lower estimate may simply be a narrower scope. Before comparing bottom-line totals, ask each contractor to provide a written scope of work that lists exactly what is and is not included. This is a reasonable request and a professional contractor should be able to provide it.
Insurance and Overhead
A contractor who carries general liability insurance and workers' compensation has overhead that one who does not simply does not have. This is a real cost difference, not padding. If a worker is injured on your property and the contractor does not carry workers' compensation, the liability can fall on the homeowner. Request a certificate of insurance from any contractor you are seriously considering, and verify that coverage is current before work begins.
What a Lower Estimate Might Mean
A lower estimate is not automatically a red flag. It may reflect a genuinely different — but legitimate — approach to the project. A contractor who uses a different framing system, a different product tier, or a narrower scope may be able to build a deck that meets code and performs adequately for many years at a lower cost. The question is whether you understand what you're getting. If you've asked for the exact product specifications, the framing details, the fastener system, the permit and engineering responsibilities, and the full scope of work — and the lower estimate still makes sense — then it may be the right choice for your project. The problem is when homeowners compare bottom-line numbers without understanding what's behind them.
What Happens When the Cheaper Deck Needs to Be Rebuilt?
Here's the scenario that changes the math. A homeowner chooses the lower estimate, the deck is built, and a few years later problems appear — loose boards, corroded fasteners, movement in the framing, or water damage that has worked its way into the structure. Fixing surface-level issues is straightforward. But when the problem is in the framing, the repair often requires removing the finished decking to access what's underneath. That means paying for demolition, new framing, and new decking — on top of whatever was spent the first time. The apparent upfront saving can disappear quickly when the cost of a second installation is factored in. This doesn't mean every lower-priced contractor will produce a deck that fails. Many do excellent work at competitive prices. But it does mean that the long-term cost of a deck isn't just the initial estimate — it includes the maintenance, repair, and potential replacement costs over the life of the structure. In South Florida, where sun, humidity, rain, and coastal salt exposure accelerate material degradation, the specification decisions made at the start have a larger effect on long-term performance than they might in a milder climate.
The most useful thing you can do before choosing a contractor is ask for a written scope of work from each one. Not a verbal summary — a written document that specifies the materials, framing, fasteners, and inclusions. Then compare those documents, not just the totals. If you'd like to see what a Deckmasters written proposal looks like, request an estimate and we'll walk you through it.
Read the full contractor comparison guide