Unlike a simple interior bedroom door, your front entryway is a primary load-bearing security point and the frontline defense against -20°F windchills. Hanging an exterior door improperly by even 1/8th of an inch will result in the deadbolt failing to lock, the door dragging violently across your hardwood floors, or massive heating bills as winter winds scream through the frame gap.

You do not hire a "handyman" to install a $3,500 fiberglass ProVia door. You need a dedicated exterior specialist. Here are the three critical questions you must ask during the estimate process to expose amateurs before they ruin your home.

Question 1: "What Do You Do About Sill Rot?"

This is the ultimate litmus test for a door installer in the Midwest. Because of decades of driving rain and melting snow boots, older Des Moines homes almost always have massive water damage hidden in the subfloor beneath the existing threshold.

• The Amateur Answer: "Oh, we don't usually see that. If there's a little rot, we'll just slide some sheet metal over it and put the new door on top." (Result: The $3,000 door rapidly sags because the foundation beneath it is still crumbling oatmeal).
• The Elite Answer: "Before we set the new prehung system, we completely expose the rough opening. If the sill plate is rotted, we stop. We act as rough carpenters, cut out the bad wood, and sister in brand-new pressure-treated lumber and marine-grade plywood to ensure a perfectly level, structural foundation. We write this potential contingency into the initial contract so there are no surprise fees."

Question 2: "How Do You Handle the Rough Opening Gap?"

When the new frame is installed inside the hole in your wall, there is usually a 1/2-inch to 1-inch empty gap surrounding the entire perimeter.

• The Amateur Answer: "We just stuff standard pink fiberglass batts in there and nail the trim over it." (Result: Fiberglass only filters air; it does not stop it. A January blizzard will blow straight through the pink fluff).
• The Elite Answer: "We use specialized "Low-Expansion" Window & Door Polyurethane Foam. We shoot the gap full of foam, which swells to create a crushing, 100% airtight thermal barrier. We strictly use low-expansion formulas so the pressure does not violently bow the new door frame inward."

Question 3: "Are You EPA Lead-Safe Certified?"

If your home was built before 1978 (like virtually all of Beaverdale, Waterbury, and Waveland Woods), the original wood surrounding the door frame almost certainly contains toxic lead paint.

• The Amateur Answer: "Yeah, we're careful. We'll put a tarp down on the porch." (Result: When they pry off the old trim, paint shatters, releasing microscopic lead dust that circulates through your central HVAC system, poisoning the home).
• The Elite Answer: "Yes, we are federally certified under the EPA Lead RRP rule. We will seal off the entryway from the rest of the house with thick plastic sheeting, use heavily filtered HEPA vacuums, and bag all debris inside the "hot zone" before removing it from the property."