What to Inspect Your First Week in a New Home (7 Critical Checks)

TL;DR: In your first week, inspect HVAC filters, check water heater age and pressure relief valve, examine attic ventilation and insulation, test all smoke and CO detectors, verify electrical panel labeling, walk the property for drainage issues, and locate every water and gas shutoff valve. Document everything with photos and dates—this baseline will guide your maintenance calendar for years.

_Last reviewed: July 2026 · 6 min read_

The home inspection you paid for before closing covered major defects. But most inspections happen when the house is staged, heated or cooled to ideal temps, and empty. Now you're living in it. Boxes are stacked everywhere. The HVAC is running nonstop. Water is flowing through every fixture. This is when you catch the details that matter day-to-day—and when you establish a maintenance baseline before the seller's disclosure period ends.

Okoniq Property Hub gives you a place to log every serial number, filter size, and service date you discover this week. Start a digital file now; you'll reference it for the next decade.

What mechanical systems should you inspect first?

Start with the HVAC system. Pull the air filter—write down its size (16×25×1, 20×20×1, etc.) and buy a six-month supply. If the filter is gray with dust, the previous owner deferred maintenance. Replace it immediately and set a recurring 60-day reminder. A clogged filter forces the blower motor to work harder, shortening compressor life and spiking your electric bill by 15–20%.

Next, find the water heater. Open the data plate and write down the serial number—the first four digits are usually the manufacture date (0423 = April 2023). If the heater is over 10 years old, budget $1,200–1,800 for replacement within two years. Test the temperature-pressure relief valve by lifting the lever; water should flow from the discharge pipe. If nothing happens, the valve is seized and must be replaced—a $150 repair that prevents a catastrophic rupture.

Check the AC condensate drain line if you have central air. Pour a cup of water into the drip pan under the air handler; it should drain within seconds. If it pools, the line is clogged with algae. Flush it with a wet-dry vac or call an HVAC tech before summer. Condensate overflows cause more ceiling stains than roof leaks in humid climates.

Why does attic condition matter in the first week?

Climb into the attic with a flashlight and tape measure. Look for daylight through the roof deck—small holes mean roof vents or prior leaks, but large gaps indicate missing sheathing or storm damage. Measure insulation depth: 10–14 inches of fiberglass equals R-30 to R-38, the minimum for most US climates. If you see less than 6 inches, an attic insulation upgrade will cut heating and cooling costs by 20–30%.

Check attic ventilation balance: count the number of soffit vents along the eaves and roof vents at the ridge or gables. A balanced system has roughly equal intake (soffit) and exhaust (ridge/gable) area. If soffit vents are blocked by insulation or you see black mold on the underside of the roof deck, ventilation is inadequate. Poor airflow traps moisture, leading to $3,000–8,000 in attic mold remediation and sheathing replacement.

Look for signs of bats or rodents—droppings, staining along rafters, or shredded insulation. Address infestations in the first month; guano buildup degrades insulation R-value and introduces histoplasmosis spores. Note the location of any junction boxes or wiring. If you see cloth-wrapped or ungrounded wiring, ask an electrician about aluminum wiring safety or knob-and-tube replacement costs.

What safety devices require immediate testing?

Test every smoke detector and carbon monoxide alarm by pressing the test button. If a unit chirps intermittently, replace the battery. If it doesn't chirp at all after a battery swap, replace the entire unit—detectors expire after 10 years, CO alarms after 5–7. Write the installation date on each unit with a Sharpie. In a 2,000 sq ft home, you need at least one smoke detector per floor plus one inside each bedroom, and one CO detector per floor if you have gas appliances or an attached garage.

Open the electrical panel and verify that every breaker is labeled. Flip each breaker off and back on while a helper walks the house to confirm which outlets and fixtures are on that circuit. Relabel any that are wrong or missing. If you see rust, scorching, or a burning smell, call an electrician immediately—corrosion inside the panel can cause arcing and fire. Check for double-tapped breakers (two wires under one screw)—a common code violation that creates a loose connection and fire risk.

Locate the main water shutoff valve, usually near the water meter or where the service line enters the house. Turn it clockwise a quarter turn, then back—if it's frozen or leaks, replace it now while you have access. Do the same for gas shutoffs at the meter and behind each gas appliance. In an emergency, you'll have 30 seconds to act; knowing where these valves are prevents a $10,000 flood or explosion.

How do you establish a drainage and moisture baseline?

Walk the perimeter of the house after the first heavy rain. Look for standing water within 10 feet of the foundation, clogged or sagging gutters, and downspouts that dump water next to the slab. Downspouts should extend at least 6 feet from the foundation and daylight onto a slope or into a buried drain line. If water pools against the foundation, you'll see efflorescence (white mineral crust) on the basement walls within a year—a $5,000–15,000 basement waterproofing problem.

Check crawl space vents (if you have a vented crawl) or the basement dehumidifier setting (if you have a conditioned space). Relative humidity should stay below 60% year-round to prevent mold. If the basement smells musty or you see condensation on cold water pipes, add a 50-pint dehumidifier and set it to 45%. Run it continuously for the first two weeks to establish a baseline, then adjust.

Inspect under sinks, around toilets, and behind washing machine hoses for water stains or active drips. Even a slow leak—two drips per minute—wastes 30 gallons per month and rots subfloors. Tighten hose connections and replace any rubber supply lines over five years old with braided stainless steel. If you see cast iron drain pipes under the house, tap them with a screwdriver handle; a dull thud means internal rust, and sections may need replacement within five years.

What records should you create this week?

Take photos of every system you inspect: the water heater data plate, HVAC filter slot, electrical panel labeling, attic insulation depth, and all shutoff valves. Create a spreadsheet or use Okoniq to log serial numbers, filter sizes, and test dates. When a technician visits two years from now, you'll know exactly when the last service happened and what parts to order.

Measure and photograph any cosmetic issues—nail pops, hairline cracks, door gaps. If these worsen in the first year, they may be settlement-related and covered under your builder's warranty or homeowner policy. Without a dated photo, you can't prove when the damage started.

Set up a maintenance calendar: HVAC filters every 60 days, smoke detector batteries twice a year, water heater flush annually, chimney inspection before first use. Most system failures happen because owners forget when the last service was due. A shared calendar or app reminder costs nothing and prevents $2,000 emergency calls.

FAQ

How soon after moving in should I schedule professional inspections?

Schedule HVAC, chimney, and septic inspections within 30 days if the home inspector flagged concerns or if the systems are over 15 years old. For newer systems with no red flags, annual inspections are sufficient. The first week is about owner-level checks—you're confirming the house is safe and functional before the warranty clock starts ticking.

What do I do if I find a problem the home inspector missed?

Document it with photos and dates, then contact your real estate agent and the inspector's company within the disclosure period—typically 30–90 days depending on your state and contract terms. If the issue is safety-critical (gas leak, electrical hazard, structural failure), hire a specialist to write a report and file a claim against the inspector's errors-and-omissions insurance. Minor issues like a clogged drain line are usually your responsibility post-closing.

Should I replace all locks and garage door openers immediately?

Yes. Re-key all exterior door locks or replace the cylinders—a locksmith charges $50–100 per lock, or buy a re-key kit and do it yourself in an hour. Change the garage door opener code using the "learn" button on the motor unit; the previous owner, their contractor, and neighbors may still have the old code. This is a security baseline, not maintenance, but it belongs on your first-week checklist.

How do I know if my water heater is about to fail?

Check for rust on the tank exterior, water pooling at the base, or rumbling noises during heating cycles—rumbling means sediment buildup on the heating element, which reduces efficiency and accelerates corrosion. If the heater is over 8 years old and shows any of these signs, start shopping for a replacement. Budget $1,200 for a 50-gallon gas unit or $800 for electric, plus $400–600 for installation.

What's the most overlooked inspection in the first week?

Testing the sump pump. Pour a bucket of water into the sump pit until the float rises and the pump activates. If it doesn't turn on or if it runs but doesn't lower the water level, the pump is dead or the discharge line is clogged. Sump pump failure causes 40% of basement floods in homes with perimeter drains. Test it every three months and replace the pump every 7–10 years, even if it still runs—the seals wear out and lose pressure.

This is educational information, not engineering or home inspection advice. Consult a licensed home inspector, electrician, plumber, or HVAC technician if you find conditions outside your skill level or comfort zone.