# 10 Questions to Ask a Door Replacement Contractor

> 10 questions to ask before signing a door replacement contract — material grade, glass package, framing details, and warranty terms that protect you.

![10 Questions to Ask a Door Replacement Contractor](/images/doors/adobestock_750709593.jpg)

Reviewed by the Remodel Your Home editorial team · Updated August 19, 2026

Door replacement looks simple but involves material selection, frame prep, flashing, and hardware installation — details that separate a door that lasts 20+ years from one that fails in 5. These questions reveal whether a contractor is doing it right.

## The 10 Questions — and Why Each One Matters

A contractor who answers these confidently, with specifics, is demonstrating the transparency and competence that separates good work from mediocre work.

1

### “Are you licensed in my state, and can I see your current liability insurance?”

**Why this matters:** Licensing requirements vary by state. Liability insurance protects your home if something goes wrong during installation; verify the policy is current, not expired.

2

### “What is the door material, and what's the specific brand and product line?”

**Why this matters:** Steel, fiberglass, and wood perform very differently. Ask for the specific brand and series — not just "fiberglass door" — so you can research the warranty and independent reviews yourself.

3

### “Is this door ENERGY STAR certified, and what's the glass package?”

**Why this matters:** For doors with glass — sidelights, transoms, or full-glass patio doors — the glass package (low-E coating, gas fill, number of panes) drives both energy performance and cost. Ask for the specific U-factor.

4

### “How do you handle discovery of rotted framing at the rough opening?”

**Why this matters:** Rot in the door frame is common, especially on older homes. Ask what happens when they find it: a fixed price per linear foot of framing replacement, or hourly? Get this in writing before demo begins.

5

### “What does your installation warranty cover, separate from the manufacturer's product warranty?”

**Why this matters:** Product warranties cover the door and glass; installation warranties cover the contractor's workmanship — flashing, sealing, and framing. Ask specifically what's covered if a draft or leak appears in year 2.

6

### “Are you a certified installer for the door brand you're selling?”

**Why this matters:** Some manufacturers require certified installation for the warranty to remain valid. Ask to see the certification for the specific brand and confirm your installation won't void it.

7

### “Will you replace the threshold and weatherstripping as part of this job?”

**Why this matters:** A full door replacement should include a new threshold and weatherstripping, not just the door slab and frame. Ask specifically what's included versus what's an upgrade.

8

### “How long will the installation take, and is it a same-day job?”

**Why this matters:** A single door replacement typically takes 3–5 hours. Patio doors and custom sizes take longer. Ask what happens to your home's security if the job runs past a single day.

9

### “Do you offer financing, and what are the terms including APR?”

**Why this matters:** Many door contractors offer 0% financing for a promotional period. After that period, rates often jump significantly. Know the full terms before using contractor financing.

10

### “Can you provide references from door installations completed in the last 6 months?”

**Why this matters:** Recent references reveal current quality and communication. Ask references specifically whether the door seals well, whether the timeline held, and whether they'd hire this contractor again.

## Red Flags to Watch For

Any of these during your contractor search should prompt closer scrutiny or disqualification:

- Same-day pricing pressure with a deadline
- Vague about the specific door brand and product line being installed
- Offers to skip permits on a structural opening change to "save you money"
- No written warranty terms — verbal guarantee only
- Significantly lower bid without explanation of what's different
- Can't provide proof of insurance within 24 hours

## Related Guides

- [Door Replacement Cost Guide — what to budget](/door-replacement-cost/index.md)
- [Best Door Replacement companies — how we rate contractors](/best-door-replacement-companies/index.md)
- [Signs it’s time to replace, not repair](/door-replacement-signs/index.md)

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Source: https://remodelyourhome.com/door-replacement-questions/