You have three siding bids on your kitchen table and they’re thousands of dollars apart. You’re probably wondering if the high bid is ripping you off or if the low bid is missing something. Here’s the honest truth about why siding quotes never match.
The difference is almost never about profit margin. It’s about what’s actually in the scope. Before you sign anything, here’s how to read them side by side.
Why Siding Bids Vary So Much
Estimates can vary by 30% or more for the same house. The main drivers: the siding product specified, whether old siding removal and disposal are included, the scope of trim and flashing work, and how the contractor handles local permit requirements. A bid that excludes any of those isn’t a competitive price. It’s an incomplete scope.
For reference: installed vinyl siding in the Philadelphia metro area typically runs $10–20 per square foot. Fiber cement, including James Hardie products, runs $14–25 per square foot installed. If a bid lands meaningfully below those ranges, something is almost certainly missing.
What Every Professional Siding Bid Should Include
| Bid Line Item | What to Look For | Red Flag | Why it Matters |
|---|---|---|---|
| Materials | Brand, product line, and finish specified (e.g., HardiePlank®, ColorPlus® Technology) | Just says “fiber cement” or “vinyl” with no product detail | Without a named product, you can’t compare bids accurately or confirm what’s actually being installed. |
| Estimate structure | Broken into sections with separate line items for materials, labor, and key work categories | A single number at the bottom of the page with no breakdown | A one-number estimate makes it impossible to know what you’re paying for or identify where quotes diverge. |
| Warranty | Manufacturer and labor warranties stated separately with clear terms | “We guarantee our work” with no specifics in writing | A warranty you can’t verify in writing isn’t a warranty. Get the terms on paper. |
| Payment schedule | Deposit + milestone(s) + final payment on completion | Full payment upfront or a large deposit before work begins | Once you’ve paid in full, your leverage is gone. Final payment on completion is standard for a reason. |
| Permits | Contractor is knowledgeable about local permit requirements and handles them when required | Contractor is unfamiliar with local codes or dismisses permits without explanation | Permit requirements vary by municipality across Pennsylvania and New Jersey. A contractor who doesn’t know the local codes can get your project stopped mid-job. |
| Timeline | Start date and estimated completion range in writing | No dates provided | An open-ended timeline is a project with no accountability. Get dates in writing before you sign. |
If one bid covers everything above and another skips half of it, the price difference isn’t a discount. It’s a preview of the conversation you’ll have after work starts.
What Accurate Pricing Actually Looks Like
A professional estimate isn’t just a number at the bottom of a page. It’s broken into sections so you can see exactly what you’re paying for: materials, labor, and key work categories each accounted for separately.
That level of detail matters for two reasons. First, it makes comparing bids straightforward, you can match line item to line item instead of trying to guess what’s covered. Second, it protects you if a dispute comes up later. A detailed estimate is the paper trail that shows what was agreed to before the first board came off the house.
If a contractor can’t explain where the numbers come from, that’s worth noting before you sign.
Red Flags That Should Stop You From Signing
- Full payment required upfront. Legitimate siding companies take a reasonable deposit and tie the rest to milestones. Paying in full before work begins removes your leverage entirely.
- No certificate of insurance. Ask for one before work begins. Without it, you’re personally liable for any injury on your property.
- Warranty is verbal only. Get the terms in writing. A warranty you can’t reference later isn’t something you can act on.
- No physical address. A contractor who can’t point to a local office may be a storm chaser, an out-of-area contractor who follows weather events and moves on before warranty issues surface.
- Unfamiliarity with local codes. Permit requirements vary by municipality across Pennsylvania and New Jersey. A contractor who doesn’t know the difference can get your project stopped mid-job, and the liability lands on you.
Why Porter Family Exteriors Might Be Your Highest Bid
We’re going to say the thing most contractors won’t. If you’re comparing bids and ours is at the top, there’s a reason.
Porter Family Exteriors is a James Hardie Double Crown dealer, a designation held by fewer than 2% of contractors in the country. Earning it requires sustained installation volume and verified quality, which means our crews are among the most trained and experienced in the Philadelphia area and South Jersey. That level of certification costs more to maintain. It shows up in the price.
It also shows up in what we put in writing. Our estimates are detailed and transparent: you’ll see exactly what’s included, what products are being used, and what the payment terms are before any work begins. No vague ranges. No surprises after you sign.
You’re not obligated to choose us. But if you’re comparing our estimate against a contractor with no listed certifications and a one-line quote, you’re not looking at the same product.
Frequently Asked Questions
How many bids should I get?
Three is the right number. Fewer gives you no basis for comparison; more creates diminishing returns.
Can I ask a contractor to match a lower bid?
You can ask for clarification on scope differences. Asking a contractor to match a bid with a different scope almost always results in corners cut mid-project.
Do siding contractors need to pull a permit?
It depends on the municipality. Requirements vary across Pennsylvania and New Jersey, which is exactly why working with a contractor who knows the local codes matters. The right contractor will know when a permit is required and handle it, so your project doesn’t get stopped halfway through.
Before You Sign Any Contract
Use the checklist in this post against every bid you’re holding, ours included. If a bid can’t account for every line item in that table, ask why in writing before you sign. That one step will tell you more about a contractor than any sales conversation will.
When you’re ready to compare, Porter Family Exteriors offers detailed written estimates with full transparency on scope, products, and pricing. Explore our siding services, learn more about James Hardie siding and vinyl siding options, or reach out to request a free estimate.
