How Long Should a Home Inspection Take?

The short answer: 2 to 4 hours for a typical single-family home in the Philadelphia area. A Philadelphia rowhome lands closer to 2 to 2.5 hours. A pre-1940 stone colonial in Montgomery County? Plan for 3.5 to 4 hours, sometimes more.

The longer answer is that inspection time isn't just about house size. Age, complexity, and what the inspector actually does while they're there all matter. And the fastest inspection isn't the best one.

What Takes All That Time?

Buyers sometimes wonder what an inspector is doing for three hours in a house they toured in 20 minutes. Here's where the time goes.

The roof is first. I walk it when it's safe to do so, which means physically getting up there and checking flashing, ridge, valleys, and every penetration point. That takes time to do right. Then the exterior: foundation perimeter, grading, window and door conditions, gutters, downspouts, and how water is being directed away from (or into) the house.

Inside, every bathroom fixture gets run. Every sink, every tub, every shower. I'm checking water pressure, drain speed, and signs of leaks beneath the fixtures, which means getting under the cabinets, not just turning the tap on and off. The electrical panel gets opened and documented circuit by circuit. I'm running outlets through every room with a tester. The attic gets inspected for insulation depth, ventilation, rafters, and signs of moisture or animal intrusion. The basement or crawlspace gets the same treatment.

Add the HVAC systems, the water heater, the kitchen appliances, and the written documentation at every step. That's where the hours go.

Why Philadelphia Rowhomes Aren't a Quick Job

Buyers coming from newer suburban construction sometimes assume a rowhome is simple to inspect. Smaller square footage, attached walls on both sides, it should be fast, right?

Not always. A 1920s rowhome in Germantown or a 1940s brick twin in Northeast Philly often has knob-and-tube wiring that's been partially updated (or partially abandoned, which is worse). Cast iron plumbing that may be draining fine today but is 70 years past its expected lifespan. A basement with a stone foundation on one wall and a poured concrete patch on another, from three owners ago. Multiple bathroom additions that were done without permits.

There's more to trace in an old rowhome than in a newer detached house with a clean build history. The square footage is smaller but the complexity isn't.

What a Review Taught Me About Rushed Inspections

I came across a review from a buyer who regretted using a particular inspector. The buyer described watching the inspection from the kitchen, clocking how long the inspector spent in each room. The inspector "was in the house for 3 hours, running the water, scanning the walls." That sounded reassuring. But the buyer had a friend who used a different company and described an inspector who finished a similar house in under 90 minutes.

The buyer with the faster inspection found out later, after closing: the attic had significant moisture damage and the electrical panel had double-tapped breakers throughout. Neither item showed up in the report. The inspector had been in the house, technically. The attic hatch was in a bedroom closet and the panel was in the basement utility room, and it seems like neither got the time they needed.

The buyer who watched the 3-hour inspection paid a little more and got a report they could actually use.

The 90-Minute Red Flag

If your inspector finishes a single-family home in under 90 minutes, ask what they didn't look at. Because on a standard house, physically running water at every fixture, checking every accessible outlet, getting into the attic, and documenting findings takes more than 90 minutes by itself.

An inspection that ends quickly might mean a small, uncomplicated property. Or it might mean the crawlspace didn't get opened. The attic hatch was stiff and got passed over. The panel wasn't documented circuit by circuit. These are the things that show up after closing.

You're spending hundreds of thousands of dollars. A few extra hours on the front end is the right trade.

The 400+ Item Standard

InterNACHI's Standards of Practice, which I follow on every inspection, covers more than 400 individual items across all major systems. Roof, structure, electrical, plumbing, HVAC, insulation, windows, doors, interior, exterior, and more. It's not a checklist you can sprint through. Each item requires a trained observation, a judgment about condition, and documentation that ends up in your report.

That's why inspection time is a quality signal, not just a logistics detail. A fast report is possible. A thorough one takes longer.

What to Ask Before You Book

Call before you schedule and ask directly: "How long do you plan to spend at this property, and what's included?" A straightforward answer ("I'll be there about 3 hours for a home that size, and I include the attic and crawlspace in every inspection", tells you a lot, and vagueness or a number that seems too low tells you something too.

I'll always give you a specific answer when you call. And if the house is a complicated pre-1940 stone foundation type in Wyncote or Cheltenham, I'll tell you upfront that it'll run longer, because it will.

If you're buying in Philadelphia, Cheltenham, Jenkintown, or anywhere in the surrounding counties, call before you book. I'll tell you exactly how long I plan to spend at the property, before you pay anything.

Bob Klebanoff
Owner, All Seasons Home Inspections
610-348-6728  |  Free Estimate