9 Questions to Ask Before Hiring a Siding Contractor
Siding protects the structural shell of your home from water, wind, insects, and UV damage. When siding fails, water gets behind it, and the resulting rot, mold, and structural damage can cost far more to repair than the siding itself. The quality of installation -- especially around windows, doors, and trim details -- matters more than the siding material you choose.
9 QuestionsPrintable ChecklistAvg Cost: $5,000 - $15,000 per job
Questions to Ask
1Will you remove the old siding completely, or install over it?
Why It Matters
Installing over existing siding hides water damage, rot, and insect damage underneath. It also changes the wall profile at windows and doors, creating problematic transitions.
Red Flag
They recommend installing over old siding without inspecting what's behind it, purely to save labor costs.
Pro Tip
Full removal is almost always the better choice. It allows inspection of the sheathing, house wrap, and window flashing. Any rot or damage can be repaired before the new siding goes on.
2What house wrap or weather barrier will you install, and how will you flash the windows?
Why It Matters
House wrap and window flashing are the actual waterproofing system. Siding is just the first line of defense. If water gets past the siding (and it will), the house wrap and flashing prevent it from reaching the sheathing.
Red Flag
They plan to reuse existing house wrap, or they don't discuss window and door flashing at all.
Pro Tip
New house wrap (Tyvek, Typar, or similar) should be installed over the sheathing. Window and door flashing should use peel-and-stick membrane integrated with the house wrap in a shingle-lap pattern.
3What siding material do you recommend for my home, and what are the maintenance requirements?
Why It Matters
Vinyl is the cheapest but warps in extreme heat. Fiber cement (Hardie Board) is durable but must be painted. Engineered wood (LP SmartSide) offers a natural look with good durability. Each has tradeoffs.
Red Flag
They only install one type of siding and push it regardless of your climate, budget, or aesthetic preferences.
Pro Tip
Ask about warranty length, maintenance schedule, and how the material performs in your specific climate. Fiber cement handles heat well but is heavy. Vinyl handles moisture well but can melt near grills or become brittle in extreme cold.
4How do you handle corners, soffits, and trim details?
Why It Matters
Corners, soffits, and trim are where the craftsmanship shows. Sloppy trim work makes an entire siding job look cheap, and poorly sealed trim is where water infiltration starts.
Red Flag
They don't discuss trim details, or they use caulk as the primary waterproofing at trim-to-siding transitions.
Pro Tip
Ask to see photos of their corner detail work, soffit installation, and window trim. Quality installers use J-channel at trim transitions, properly align horizontal courses, and avoid face-nailing where possible.
5Are you a manufacturer-certified installer, and what warranty will I receive?
Why It Matters
James Hardie, LP SmartSide, and major vinyl manufacturers offer enhanced warranties (up to 30-50 years) when their products are installed by certified contractors. Non-certified installation may only get a limited product warranty.
Red Flag
They claim certification but cannot provide documentation, or they install a brand they're not certified for.
Pro Tip
Manufacturer certification means the contractor has completed training specific to that product's installation requirements. The enhanced warranty typically covers both materials and labor.
6How do you ensure proper ventilation behind the siding?
Why It Matters
Trapped moisture between siding and sheathing causes rot and mold. Proper ventilation (through a rain screen or furring strips) allows air circulation and moisture drainage behind the siding.
Red Flag
They install siding directly against house wrap with no ventilation gap, especially in humid climates.
Pro Tip
A rain screen (furring strips creating a 3/8 to 3/4 inch air gap behind the siding) is best practice, especially for fiber cement and wood siding. It dramatically reduces moisture-related failures.
7What is your plan for protecting my landscaping, windows, and property during installation?
Why It Matters
Siding removal generates debris, and new siding installation involves cutting that creates dust. Landscaping, windows, and outdoor furniture need protection.
Red Flag
They have no plan for property protection or debris management.
Pro Tip
Look for: tarps over landscaping, a dumpster on site for debris (not piled in your yard), protection on walkways, and daily cleanup of nails and cut material.
8How long will the project take, and what happens if it rains during installation?
Why It Matters
An open wall without siding is exposed to weather. Extended project timelines increase the risk of water damage during installation.
Red Flag
They can't commit to a timeline, or they plan to leave walls open and uncovered overnight.
Pro Tip
A professional siding crew should complete a typical home in 1-2 weeks. They should have a plan to cover any exposed wall sections with house wrap or tarps if rain is expected.
9What is your warranty on workmanship, and how long have you been in business?
Why It Matters
A 10-year workmanship warranty is only valuable if the company will still exist in 10 years. The length of time in business is the best predictor of warranty reliability.
Red Flag
A brand-new company offering a lifetime warranty, or a company that cannot provide business references from 5+ years ago.
Pro Tip
A 5-10 year workmanship warranty from a company with 10+ years in business and verifiable local references is more valuable than a lifetime warranty from a new company.
Bonus Tips for Hiring a Siding Contractor
Ask for a detailed materials list that specifies the exact product, color, and trim components. Siding colors can vary between production runs, so all materials should come from the same batch.
If your home was built before 1978, have a lead paint test done before siding removal. Disturbing lead paint without proper containment is both a health hazard and a legal violation.
Drive by homes the contractor sided 3-5 years ago. New siding always looks good -- you want to see how it ages, whether colors have faded, and whether seams and joints have held up.
Get the manufacturer's installation guide for your chosen siding product and compare it to the contractor's plan. Many installation failures occur because installers deviate from manufacturer specifications.
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