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Hiring the wrong contractor is the single most expensive mistake a homeowner can make. A bad installation doesn't just look bad — it voids warranties, causes damage, and creates safety hazards. Here's how to find a contractor you can trust.
Verify Licensing and Insurance
In Maryland, home improvement contractors must hold an MHIC (Maryland Home Improvement Commission) license. In Delaware, contractors need a state business license and may need additional permits depending on the county. Ask for proof of both general liability insurance ($1M minimum) and workers' compensation. If a worker is injured on your property and the contractor doesn't have workers' comp, you could be liable.
Check Track Record
Look for: 10+ years in business (the average shady contractor lasts 3 years), consistent Google and BBB reviews (not just a few recent 5-star reviews), manufacturer certifications (GAF Master Elite, fiber cement Preferred, Pella Certified), and a permanent business address (not just a P.O. box).
Get Detailed Written Estimates
A legitimate estimate should specify: exact materials by brand and model (not just 'architectural shingles'), scope of work in detail (tear-off, underlayment, ice shield, ventilation, cleanup), timeline and payment schedule, warranty terms (both manufacturer and workmanship), and permits included. Beware of one-page estimates with vague line items.
Red Flags That Scream 'Run Away'
Door-to-door solicitation after storms (storm chasers), pressure to sign immediately ('this price is only good today'), requests for large upfront deposits (more than 10-20%), refusal to provide a written contract, unusually low bids (they're cutting corners somewhere), no permanent business address or landline, and no verifiable references from recent projects.
The Payment Trap
Never pay more than 10-20% upfront. A legitimate contractor has the credit and cash flow to purchase materials without requiring your full payment in advance. Standard payment schedules are: 10-20% at contract signing, 40-50% at material delivery/project start, and the balance at satisfactory completion. Never make the final payment until a final walk-through confirms everything meets expectations.
Why Manufacturer Certification Matters
Manufacturer certifications (like GAF Master Elite or fiber cement Elite Preferred) aren't just marketing — they require verified training, insurance, and quality track records. More importantly, they unlock the best warranty packages. Without the right certification, your contractor literally cannot offer you the best warranty, regardless of how well they install.