Exterior contracting has a higher proportion of problematic operators than most trades — partly because licensing requirements are less stringent, and partly because the most consequential work (house wrap, flashing, ventilation) is invisible once the cladding goes on. Problems can take years to surface, by which time the contractor is long gone. Here’s what to watch for before you sign anything.
“The exteriors that fail early almost always have a story that starts with one of a handful of red flags — no house wrap specified in the quote, a price that seemed too good to be true, a crew that couldn’t explain why they were doing what they were doing. The warning signs are almost always there. Most homeowners just don’t know what they’re looking for.”
— Diane Osei, exterior contracting specialist and drainage consultant with 13 years of experience in residential eavestrough design and installation across the Ottawa Valley and Eastern your region
Table of Contents
Red Flags Before You Hire
Quote doesn’t specify products by name. Any exterior quote that says “vinyl siding” without a brand, gauge, or warranty class is hiding the quality of what you’re getting. A professional contractor specifies exactly what they’re installing.
No mention of house wrap or flashing. These are the moisture management components that determine long-term performance. Their absence from the quote means they may not be included in the price — or the installation.
Solid soffit quoted where vented is needed. A contractor who specifies solid soffit without assessing your attic ventilation requirements either doesn’t know what they’re doing or is cutting costs on a component you can’t see.
Unable to produce insurance or workers’ compensation coverage clearance. These are non-negotiable. Inability or reluctance to provide them immediately is a disqualifying red flag. See: Questions to Ask an Exterior Contractor About Licensing and Insurance
No tax-registration number or business registration. A contractor operating without a registered business has no formal accountability. Cash-only operators in this category frequently disappear when warranty claims arise.
Quote significantly lower than all others. A dramatically lower price almost always means something is missing — thinner gauge siding, no house wrap, reused flashing, no proper window detailing. Ask exactly what’s different. See: Questions to Ask When Getting an Exterior Contracting Quote
Pressure to sign immediately. No exterior project requires a same-day decision. Pressure tactics are designed to prevent you from comparing quotes or verifying credentials.
Large upfront deposit required. Ten to twenty-five percent is reasonable. Anything above thirty-five to forty percent — especially in cash — is a warning sign.
Red Flags During the Job
Siding going on without house wrap. If you walk by and see siding panels being installed without any house wrap having been applied, stop the job and ask immediately. House wrap cannot be added after the fact.
No flashing visible at windows and doors. Before any trim or siding is installed around an opening, self-adhering flashing tape should be visible at the sill and jambs. If trim is going on directly over bare OSB, the windows aren’t being flashed.
Crew can’t answer basic questions about what they’re doing. A qualified installation crew can explain why they’re doing what they’re doing. Vague or evasive answers to basic installation questions are a signal.
Substrate damage claimed but not shown. Any claim for additional sheathing replacement should be accompanied by documentation — photos or an in-person look — before the work proceeds. Undocumented substrate claims are a known upsell tactic.
No nail sweep or cleanup before leaving each day. A crew that doesn’t clean up after itself every day is a crew that doesn’t care about the details — which usually extends to the installation itself.
Red Flags After the Job
Siding panels buckling in the first summer. Buckling is almost always caused by panels installed too tightly, without proper expansion gaps. This is a workmanship defect.
Water infiltration at windows after the first rain. Leaks at window openings after new siding are almost always caused by improper or absent flashing — a serious workmanship failure.
Eavestroughs overflowing in normal rain. Overflow in a system that was just installed means the slope, sizing, or downspout placement is wrong.
Related Questions
- Questions to Ask an Exterior Contractor Before You Hire One
- Questions to Ask an Exterior Contractor About Licensing and Insurance
- Questions to Ask When Getting an Exterior Contracting Quote
- What to Do If an Exterior Contractor Does Bad Work
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