What to Expect When a Siding Contractor Shows Up for an Estimate (And the Five Questions to Ask)

A siding estimate should take 45 minutes minimum, not 5. The short ones are almost never the thorough ones — and the difference between a 10-minute visit and a proper inspection often shows up two years later as a leak you paid twice to fix.

Here is what a legitimate estimate visit looks like, the red flags that tell you to move on, and the five questions that separate a contractor who knows siding from one who knows sales.

What a thorough estimate actually looks like

A well-run estimate visit has four distinct phases. If a contractor skips any of them, they are not bidding the same job the thorough ones are bidding.

Outside walkaround — about 20 minutes. The contractor should walk the full perimeter of the house. They are measuring wall area and counting stories (this affects both material quantities and labor rates), identifying the current siding material, and eyeballing the condition of trim, corners, and the flashing at windows, doors, and rooflines. Gutters and fascia get a look too — rotted fascia means the trim work will cost more, and overflowing gutters are a clue about where water has been hitting the wall. A contractor who measures from the driveway and goes straight to a number is working from assumptions.

Close-up wall and trim inspection — about 15 minutes. A contractor who won't get close to the wall is guessing. Full stop. They need to be checking the condition of the existing siding up close — cracking, warping, fading, loose panels — and looking hard at the joints and penetrations: window and door surrounds, corner posts, hose bibs, vents. None of those conditions are visible from a driveway or a drone photo. If they hand you a number without examining the wall, that number is not based on your house.

Wall-condition assessment — 10 to 15 minutes. This is the step most homeowners do not expect, and the one that most contractors skip. The single biggest cost variable on a siding job is the condition of the sheathing under the old cladding, and you can't see it from the outside. A thorough contractor pulls a panel or two — at the base of the wall, below a window, anywhere staining suggests trouble — to check the sheathing and house wrap underneath. They press for soft spots, look for moisture stains, and check whether the existing flashing was ever done correctly. A contractor who skips this cannot quote sheathing replacement honestly and is handing you an incomplete bid.

Post-inspection conversation — about 15 minutes. Before they leave, a good contractor sits down and tells you what they found. Not a pitch — a report. Here is what the walls look like, here is what the quote will include, here is what I would do if this were my own house. If they walk out the door and say "I'll email you something," the debrief did not happen. The conversation is where you learn whether they actually inspected anything.

Red flags during the visit

Most of these are fast tells. You will know within the first 20 minutes whether the visit is going well.

• Estimate in under 20 minutes. They are pricing based on wall square footage and a rough material guess. They have not looked at your flashing, your fascia, your trim, or your sheathing. That speed will show up somewhere in the work.
• Never got close to the wall. They are not looking at your siding. An aerial measurement service can tell you square footage; it cannot tell you what is wrong with the cladding. If they never inspected up close, they do not know.
• No interest in the sheathing. They cannot quote sheathing replacement without checking what is under the old siding. If they skip it, that scope is not in the bid — and it may be in the change orders.
• "I can do this today if you sign right now." Pressure closing on the first visit is a storm-chaser tell. A legitimate contractor knows you are getting two or three more bids. They are not afraid of that comparison because their scope can stand up to it.
• "I'll waive your deductible." That is insurance fraud in all 50 states. It is not a discount or a courtesy — it is a contractor inflating the claim to cover a cost the homeowner was supposed to pay. A contractor willing to commit fraud on the first visit is not someone you want on your house.

The five questions to ask every siding contractor

Ask these on every visit, take notes, and compare the answers side by side. The consistency and specificity of the responses will tell you more than the price.

1. What brand and product line will you use, and what's the wind and impact rating?

This question matters because "vinyl siding" is not a specification. Two bids that both say "vinyl siding" may be describing products that differ by $40 per square in material cost and 80 mph in wind resistance. A good answer names the manufacturer, the product line, the panel thickness, the warranty class, and the wind and impact ratings — for example, an impact-rated profile in a hail-prone region can meaningfully reduce homeowner insurance premiums. A bad answer is vague about brand, or the contractor does not know the ratings off the top of their head. That specificity gap is worth noting.

2. Are you tearing off or siding over the existing walls?

Some jurisdictions permit installing new siding over the existing cladding. Going over saves on tear-off labor and disposal costs, but it traps the existing problems underneath — moisture damage, bad sheathing, failed flashing — and complicates the flashing at every window. A good answer explains the trade-off and gives you a recommendation with reasoning. A bad answer defaults to siding over without examining the existing wall, or does not acknowledge that a full tear-off is almost always the better long-term call. If the existing walls have moisture damage or warped panels, siding over them is not a real repair.

3. Will you assess and quote the wall drainage and flashing as part of the scope?

This is a qualifying question as much as a planning question. If the contractor never looked behind a panel, they cannot answer it well. A good answer describes the weather-resistive barrier they'll install, whether there's a drainage gap or rainscreen behind the siding, and how every window and door will be flashed. A bad answer is a blank look, a "we'll wrap it and go," or no mention of flashing at all. Drainage and flashing are not optional on a quality job — they are the difference between a 15-year wall and a 30-year wall on the same materials.

4. How are sheathing replacements priced, and what's the allowance in the bid?

Rotten or damaged sheathing is almost always a discovery item — you do not know the full extent until the old siding comes off. A good answer tells you exactly how replacement sheathing is priced (typically per sheet of OSB or plywood), how many sheets are included as an allowance in the base bid, and what the per-sheet rate is if the job goes over. A bad answer is a flat bid with no sheathing line item and no explanation of how overages are handled. That omission means any sheathing work becomes a surprise charge midway through the job, and you have no baseline to push back against.

5. What's your workmanship warranty, and how does it interact with the manufacturer warranty?

Manufacturer warranties cover materials. Workmanship warranties cover installation. You need both, and they interact. Most manufacturer warranties require the siding to be installed by a credentialed contractor to be valid — if the installer is not certified by the manufacturer, you may have a materials warranty that is functionally unenforceable. A good answer specifies the length of the workmanship warranty (five years is baseline; some quality contractors offer 10 or 25), confirms their manufacturer certification status, and explains what the combined coverage actually looks like. A bad answer conflates the two or cannot explain the distinction.

What to have ready before they arrive

• Clear access around the house. Move planters, furniture, and anything blocking the base of the walls. A contractor who cannot get close to a wall will not inspect it properly.
• Pets secured. A crew moving ladders and walking the perimeter does not need a dog loose in the yard.
• Insurance claim paperwork, if this visit is storm-related. If an adjuster has already been out, have those notes available.
• Your existing siding's age, if you know it. Even a rough ballpark — "we bought the house in 2014 and it looked original" — helps the contractor calibrate what they are likely to find.
• A notepad. Write down product names, profiles, and warranty terms on the spot. You will not remember them later when you are comparing three bids.

After they leave

Ask for the written estimate within 24 to 48 hours. A contractor who cannot produce a written, itemized estimate within two days is not organized enough to run your job. No written estimate is no real estimate — a verbal number is not a commitment and is not comparable to anything.

When the estimates come in, compare them line by line against the other bids. If one is $3,000 cheaper and vaguer on scope, you are looking at what they left out. Cheaper bids that omit sheathing allowances, drainage and flashing work, or specific product lines are not actually cheaper — they are estimates that will grow once the job starts or quietly deliver less than the others quoted.

Check the state license board online before you sign anything. All 50 states publish contractor license status publicly, and the lookup takes 30 seconds. An unlicensed contractor means no bond, no insurance obligation, and no recourse if something goes wrong. This is a fast, free verification that most homeowners skip.

A good estimate visit should leave you better informed, not sold. If you got talked to but not taught, the quote probably is not the one.