How to Compare Siding Quotes: The Same House, Three Different Bids

Archetype 1: The Price Menu

The first document looks precise because it is full of numbers: a grid of unit prices — per square for the siding, per linear foot for fascia and trim — with quantities penciled in and a grand total at the bottom. Here is what it actually commits to: a rate. Not a scope of work, not a method, not a standard.

Look for what a rate sheet never mentions: the weather-resistive barrier under the siding, the flashing detail at windows and penetrations, tear-off and disposal commitments, the permit, warranty terms, payment terms. Those are the parts that decide whether the project succeeds — and they are precisely the parts a menu leaves blank. If the squares count turns out short, the “extras” arrive mid-project, priced from the same menu.

It helps to understand how this document gets made, because it isn’t laziness — it’s a sales model. The number is written at your kitchen table, in one visit, from what one salesperson can see and estimate on the spot. That number has to go one of two ways: inflated, to absorb everything that wasn’t measured — or thin, with the gaps destined to come back as change orders once you’re committed. Either way it usually arrives with a companion: “if you sign tonight, I can take X off.”

And here is the part homeowners discover too late: the person who wrote that number is rarely the person who builds the project. After the signature, you’re handed to a production team — who inherit a scope that was never written down, and whose job now includes telling you what wasn’t included. Two questions defuse the whole model: “Can I have the written scope of work?” and “Who, by name, runs my project after I sign?”

Archetype 2: The Open-Ended Contract

The second document is better — genuinely. It names the product line, the colors, even the weather barrier. The problem lives in the handful of lines that aren’t numbers:

• “Permits excluded — costs/fees will be added to the job.” An unpriced line that grows after you sign, with no commitment about who pulls the permit or documents inspections.
• “Substrate, if needed: $X per sheet.” No estimate, no expected quantity, no promise to document what was found. On a re-side, “if needed” is often “when needed” — this is the line the final invoice is made of.
• “Included” without quantities. Trim “included.” Flashing “included.” How much, which product, to what specification?
• Half the money before the work. A 50% deposit at the walkthrough moves the project’s risk onto you before a single plank comes off the wall.

None of these makes a contractor dishonest. But each one is a decision deferred until after you’ve signed — and deferred decisions are always priced in the contractor’s favor.

This document has a mechanism too. It comes out of quoting software — often the same backend platform across many companies, which is why these contracts look nearly identical from one logo to the next. The line items are pre-filled from a rate database and the contract lands in your inbox the same day, sometimes within the hour. It is built for a specific buyer: someone who is genuinely ready to go, but allergic to the sign-while-I’m-sitting-at-your-kitchen-table approach. The speed feels like professionalism — and the template is exactly why the document reads itemized while leaving the house-specific decisions (your substrate, your permit, your quantities) open-ended. The software has never seen your house.

The question that sorts it: “Which of these lines were written about my house — and which came with the template?” A contractor who measured, photographed and scoped your home can answer line by line. A template can’t.

Archetype 3: The Complete Scope

The third document reads differently from the first sentence: it describes work, not rates. Each section — siding, soffit and fascia, trim, even trash handling — carries its own price and a plain-English description of what will be done, down to blocking the penetrations and what happens to leftover material.

Notice how much of it is “what-if” language — and that this is a feature, not hedging. What’s under the old siding genuinely can’t be known until tear-off, so a complete scope prices the scenarios before you sign: if the substrate needs replacing, here’s the unit price and our estimate; if rot turns up at a window, here’s what that costs and how we’ll document it. You can budget the worst case on day one instead of discovering it on day four. That kind of scope is also where experience shows — the what-if lines only get written by a company that has opened enough Colorado walls to know what tends to be behind them. A template can’t anticipate your house; twenty-plus years of tear-offs can.

Five commitments separate it from the other two, and they are worth holding out for from any contractor:

• Conditional costs disclosed up front — every “if needed” item carries a unit price, an estimated total, and a promise to document the condition with photos before charging for it.
• Measurements guaranteed in writing — the contractor owns the take-off quantities; a mis-measure is their cost, not your change order.
• Materials named to the last tube — siding line and thickness, barrier, substrate, caulk, touch-up paint. If it will touch your house, it has a name.
• Milestone payments with a punch-list holdback — money staged as the work lands, and the final piece stays in your pocket until your punch list is complete.
• One project manager, start to finish — the person who scoped the project runs the project. The best-run jobs are never the ones handed from a commissioned salesperson to a production team you’ve never met; they’re the ones where the name on the estimate is the name on-site at the punch list.

The Price-Match Tell

One more pattern worth knowing, because it usually appears right when you mention a competing bid: “We’ll match whatever they have.”

Think about what that sentence admits. If the first number was real — built from measurements, material takeoffs and labor — there would be nothing to match; the number would simply be the number. A company whose price can drop 15% the moment you mention a competitor is telling you the original quote carried 15% of air. Good contractors will walk you through why two bids differ, line by line. Price-matching skips the explanation and keeps the vagueness — which, as the archetypes above show, is where the real cost lives.

The “Lifetime Warranty” Line

The price-match offer has a sibling, and it shows up in the same conversation: the lifetime installation warranty. In a siding market this competitive, “lifetime” costs nothing to print — especially for a company that hasn’t been in business ten years, let alone twenty. A installation warranty is a bet that the company will outlive the promise; the word on the paper doesn’t change the odds.

Keep the two warranty types separate when you compare bids. The manufacturer’s warranties — on fiber cement substrate and factory finish — come with the product and survive no matter what happens to your contractor. The installation warranty covers the work itself, and it is only as durable as the company behind it. So add a sixth question to the five below: “How long have you operated under this name?” — then weigh the warranty against the answer. Ten written years from a twenty-five-year company beats a lifetime promise from a letterhead younger than your water heater.

The Five Questions, and Why They Work

You don’t need to be a construction expert to sort bids — you need five questions that complete documents answer easily and incomplete ones can’t:

1. “What happens if you mis-measure — who pays?” A contractor who guarantees quantities already measured carefully. One who hesitates is planning to measure on your dime.
2. “What triggers each if-needed charge, at what unit price, and what’s your estimate?” Honest conditionals have numbers before the work starts, not after.
3. “Who pulls the permit and documents the inspections?” The answer should name the contractor, and come with paperwork to you.
4. “What’s the payment schedule — and what do I hold until the punch list is done?” Milestones aligned to work protect both sides; a half-down deposit protects one.
5. “Is every material named — down to the caulk and touch-up paint?” Specific products can be verified, warrantied and matched later. “Premium materials” cannot.

Like the question about your city’s code requirements on a roofing quote, these work as a filter: sales teams built for speed get visibly impatient with them — and that impatience is the answer.

What Siding Actually Costs in Colorado

Once the bids are comparable, the numbers have context: James Hardie fiber cement typically runs $10–$18 per square foot installed along the Front Range, with full-home replacements commonly landing between $20,000 and $60,000+ depending on size, stories, substrate condition and trim detail. The full breakdown by material is in our Colorado siding cost guide, and the siding Q&A hub answers the material-by-material questions.

Comparing Siding Quotes: Common Questions