9 min read · Pillar Guide
Siding is one of the larger investments you'll make in your home, and the quality of the result depends as much on who installs it as on the material you choose. The good news is that you can tell a lot about a contractor from how they answer a handful of specific questions — and the right questions filter out the operators you don't want before they ever touch your house. Below are 12 questions worth asking every siding contractor you talk to, along with what a solid answer sounds like. A reputable contractor will welcome them; evasiveness on these is itself an answer. For the warning signs that should end a conversation early, pair this with siding contractor red flags.
1. What's your CSLB license number?
In California, this is non-negotiable. Any contractor doing this size of work must hold a current Contractors State License Board license, and you can verify it yourself in seconds at the CSLB website. A good answer is a license number offered without hesitation. Look it up — confirm it's active, in the right classification, and matches the business name on your contract. Learn more about how we work.
2. Are you insured, and do you carry workers' comp?
Ask for proof of general liability insurance and, if they have employees, workers' compensation. This protects you: if someone is hurt on your property or your home is damaged, you don't want exposure falling on you. A good contractor provides current certificates without fuss. 'We're careful, we don't need it' is not an acceptable answer.
3. Will I get a detailed written contract?
Everything should be in writing — scope, materials, price, payment schedule, timeline, and what's excluded. A detailed written contract protects both sides and is your reference if anything is disputed. Be wary of anyone who wants to work on a handshake or a one-line estimate; the contract is where the real agreement lives.
4. Who actually does the work?
Find out whether the crew is the contractor's own trained team or rotating day labor, and who supervises the job day to day. Siding quality lives in the details, and a consistent, experienced crew with real supervision produces better results than an anonymous crew assembled per job. You want to know who will be on your property and who's accountable for the work.
5. How will you detail the wall behind the siding?
This is the question that separates a finisher from a craftsman. The boards are only part of the system — the weather-resistive barrier, flashing at every opening, ground clearance, and ventilation behind the cladding determine how long the wall lasts. A contractor who can speak fluently about the weather barrier and flashing is one who builds walls that don't rot. Vague answers here are a warning.
6. What warranty do I get — on materials and labor?
There are two warranties: the manufacturer's on the product, and the contractor's on the workmanship. Ask about both, get the terms in writing, and ask how warranty service actually works if something goes wrong. A contractor confident in their work stands behind it. See how we handle our workmanship warranty.
7. Can I see recent work and talk to past clients?
Ask for photos of completed projects and references you can actually contact — ideally jobs similar to yours. Real references and a genuine portfolio are easy for an established contractor to provide. Reluctance, or only being able to show stock images, tells you something.
8. Will you pull the required permits?
Significant siding work often requires permits, and the contractor should handle them as part of the job. A contractor who suggests skipping permits to save time or money is exposing you to problems at resale and with code compliance. Pulling permits is also a sign they're operating legitimately and expect their work to pass inspection.
9. What's the payment schedule?
Understand exactly when money is due and tied to what. California law limits how much can be collected upfront, and healthy payment schedules are tied to project milestones, not paid in full in advance. This matters enough that it has its own guide — see contractor deposit and payment rules. If you need to spread the cost, ask about financing options.
10. What's the timeline, and what could delay it?
Ask for a realistic start and completion window and what typically causes delays — weather, material lead times, hidden damage found during tear-off. An honest contractor gives you a range and names the variables rather than promising an unrealistically fast finish. The honest version of project duration is covered in how long a re-side takes.
11. How do you handle cleanup and disposal?
Tear-off generates a lot of debris, and old siding may need specific disposal. Confirm cleanup and haul-away are included and what the site will look like day to day. It's a small question that reveals how organized and professional the operation is.
12. How are changes and surprises handled?
Tear-off sometimes reveals hidden damage — rot, prior bad repairs — that changes scope. Ask how change orders work: will you get a written, priced change order to approve before extra work proceeds? You want no surprise charges, and a clear process means you stay in control of the budget even when the wall has surprises behind it.
Putting the questions to work
The point of these twelve questions isn't to interrogate — it's to surface how a contractor operates before you commit. Verify the license on the Contractors State License Board, get every answer in writing, and watch for the red flags that should end a conversation. A contractor confident in their work welcomes the scrutiny, just as a fair deposit and payment schedule signals an honest operation. If you'd like to see how we answer all twelve, learn more about how we work or request a free, no-obligation estimate and put us to the test.
Key takeaways
- A CSLB license number you can verify is the non-negotiable first question in California
- Insist on proof of insurance and workers' comp — it protects you, not just them
- Everything belongs in a detailed written contract: scope, materials, price, schedule
- How a contractor describes the wall system behind the boards reveals real skill
- Get both warranties — manufacturer and workmanship — in writing
- A reputable contractor welcomes these questions; evasiveness is itself an answer
FAQ
Quick Answers
Start with their CSLB license number, proof of insurance and workers' comp, and a detailed written contract. Then ask who does the work, how they detail the wall behind the siding, the warranties, references, permits, the payment schedule, timeline, and how change orders are handled.
Look up the license number at the CSLB website (cslb.ca.gov) and confirm it's active, in the appropriate classification, and matches the business name on your contract. A legitimate contractor provides the number without hesitation.
Yes. Ask for current general liability insurance and, if they have employees, workers' compensation, with certificates as proof. This keeps liability for injuries or damage from falling on you as the homeowner.
Because that's where walls succeed or fail. The weather barrier, flashing, ground clearance, and ventilation determine how long the wall lasts — so a contractor who speaks knowledgeably about the system, not just the boards, is one who builds durable work.
Yes — significant siding work often requires permits, and a legitimate contractor handles them. Anyone who suggests skipping permits to save time or money is creating resale and code-compliance problems for you.
Expect a manufacturer's warranty on the product and a separate workmanship warranty from the contractor, both in writing. Ask specifically how warranty service works if a problem arises after the job is done.
Sources
Authoritative references
- Contractors State License Board (CSLB) — verify a California contractor
- CSLB — Home Improvement Contracts & Down Payment Limits (CA B&P Code §7159)
External links to government, code, and manufacturer sources. Sierra Siding is not affiliated with these organizations; references are provided for verification.