The 11-Month Warranty Checklist: Protecting Your Investment

Why it matters

The 11-month warranty inspection is your final opportunity to hold your builder accountable for construction defects before the standard one-year "fit and finish" warranty expires. In new construction, a home undergoes significant settling during its first four seasons. As the framing lumber dries and the foundation finds its permanent seat, small cracks, cabinet misalignments, and nail pops become visible.

More importantly, this window allows you to identify "latent defects"—issues hiding behind walls or in attics, such as slow plumbing leaks or disconnected HVAC ducts—that could cost thousands of dollars to repair once the warranty expires. Catching a single failed window seal or a roof flashing error now can save you the entire cost of a private inspection five times over.

How often

This is a one-time event. It must be completed and the formal list submitted to your builder no later than month 11 of your first year of occupancy. Waiting until the 12th month is risky, as many builders require the list to be submitted before the actual anniversary date to schedule the repairs.

What you need

• A high-lumen flashlight: To spot imperfections in drywall and check dark corners of the attic or crawlspace.
• Blue painter’s tape: For marking scuffs, cracks, or chips directly on surfaces without damaging the finish.
• A digital camera or smartphone: To document every issue you find for your written submission.
• An outlet tester: A simple $10 device to ensure all GFCI outlets are tripping correctly.
• A notepad/tablet: To organize your list by room.
• Your original "Walk-through" list: To see if previous issues have resurfaced.

The 11-Month Checklist: Step-by-Step

1. Exterior and Building Envelope

Start outside. Changing temperatures throughout the year cause materials to expand and contract, which often reveals installation flaws.

• Roof and Gutters: Look for lifted shingles, loose flashing around chimneys, and gutters that hold standing water (improper pitch).
• Siding and Trim: Check for "frowning" (warping) in vinyl siding or gaps in caulk where trim meets the siding.
• Grading: Ensure the soil still slopes away from the foundation. New homes often experience "soil subsidence" near the foundation walls, which can lead to basement leaks.
• Concrete: Inspect the driveway and walkways. While hairline cracks are normal, any crack wider than 1/8th of an inch or vertical displacement (tripping hazards) should be reported.

2. Interior Walls and Ceilings

The structure has now settled through a full cycle of heating and cooling.

• Drywall: Check for "nail pops" (small circular bumps) and cracks above door frames or at the corners of windows.
• Trim and Baseboards: Look for gaps at the mitered corners of crown molding or baseboards that have pulled away from the floor.
• Paint: Identify areas of thin coverage or "flashing" where touch-ups from the initial move-in don't match the original sheen.

3. Doors and Windows

• Operation: Open and close every window. If a window is difficult to lift or won't stay open, the balance system may be faulty.
• Thermal Seals: Look for fogging or moisture between the glass panes, which indicates a blown seal.
• Hardware: Ensure deadbolts align with the strike plate without needing to "pull" or "push" the door.

4. Plumbing and Appliances

• Under-Sink Check: Run the faucets and garbage disposal while looking underneath with your flashlight. Look for "water rings" on the cabinet base.
• Toilets: Check the base of the toilet for any signs of rocking or leaking.
• Water Heater: Check the "Drip Pan" for any signs of moisture.
• Appliances: Ensure the dishwasher completes a full cycle without leaking and the oven reaches the set temperature accurately.

5. Attic and Crawlspace

This is where the most expensive problems are found.

• HVAC Ducts: Look for disconnected ducts or "sweating" (condensation) on the trunk lines.
• Insulation: Ensure insulation is distributed evenly and has not been moved or compressed by tradespeople during subsequent visits.
• Ventilation: Check that bathroom exhaust fans are vented all the way to the exterior, not just dumping moist air into the attic.

When to call a pro

While you can perform a DIY walk-through, hiring a Certified Professional Inspector for an "11-Month Warranty Inspection" is highly recommended.

• The Benefit: A pro has thermal imaging cameras to find missing insulation and moisture meters to find leaks behind drywall.
• The Leverage: A formal, third-party report carries significantly more weight with a builder than a handwritten list from a homeowner. It is much harder for a builder to claim a defect is "within tolerance" when a licensed inspector cites specific building codes or manufacturer's installation instructions.

Safety

• Attic Safety: Never step off the wooden ceiling joists in the attic. Stepping on the drywall between joists will result in you falling through the ceiling.
• Electrical: Use a non-contact voltage tester if you suspect a loose wire. Do not remove the "dead front" cover of your electrical panel.
• Roof: Do not climb on the roof if it is wet or if you are uncomfortable with heights. Most roof inspections can be done from the ground with high-powered binoculars or a drone.

Cost

• DIY Walk-through: $0 (excluding basic tools like an outlet tester).
• Professional Warranty Inspection: $350 – $600. The price varies based on the square footage of your home and your local market.
• The ROI: This cost is typically recovered if the inspector finds even one major issue, such as a cracked heat exchanger in the furnace or a faulty roofing flashing, which would cost well over $1,000 to repair out-of-pocket.