Home Inspections in the Rain and Cold:
What the Wet Season Shows and Hides
From October to April, most Portland inspections happen in rain or near it. That’s not a reason to wait. It changes what the inspection can see, in both directions.
Portland gets most of its rain between October and April. If you buy a house during those months, odds are good your inspection happens on a wet day.
That bothers some buyers. It shouldn’t, mostly. Rain hides a few things and shows a few others. Knowing which is which helps you read the report and plan what comes next.
What rain shows
Water is hard to fake when it’s falling. A dry August day can make a drainage problem invisible. A steady November rain puts it in front of everyone.
On a wet day, an inspector can often see:
- Gutters overflowing at a clog or a low spot
- Downspouts dumping water right at the foundation, or into a buried line that backs up
- Water pooling against the house where the soil slopes the wrong way
- Active drips at window heads, skylights, or roof penetrations
- Water moving into a crawlspace or basement while it’s happening
Crawlspace water is the big one in this region. A crawlspace that looks dry in September can have standing water in December. If it’s wet on inspection day, you’ll know. This guide to crawlspace water intrusion in Portland explains what usually causes it.
Thermal imaging also tends to work better when it’s cold. The camera shows temperature differences on surfaces. A cold outdoor day with the heat running inside makes insulation gaps and air leaks easier to see. Thermal imaging is included at no additional charge on every Trusted Home Inspections inspection. It doesn’t see through walls, but it can point to spots that deserve a closer look with a moisture meter.
Real Inspection Photos
What Water Looks Like on a Wet Inspection Day
Real photos from Russ's reports of the kind of water issues rain makes easy to see.
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Leaves and standing water in a gutter, with some gutters overflowing. Overflow can drop roof water right at the foundation. -
Standing water in a crawlspace even with a drain system and sump pumps installed. This is the kind of thing a dry August visit can miss. -
A downspout that empties right at the house. In steady rain, that water can soak the soil next to the foundation.
What rain and cold hide
Some parts of the inspection get harder, or can’t be done safely, in wet or cold weather.
The roof is the main one. A wet roof is slick, and a wet roof with moss is worse. Russ walks roofs when it’s safe. When it isn’t, he uses an FAA Part 107 drone to get a close look. A drone sees the surface well, but it can’t feel soft decking underfoot, so the report notes how the roof was inspected.
Cooling equipment is the second. Many manufacturers advise against running an air conditioner or a heat pump’s cooling mode when it’s cold outside. When that’s the case, the cooling side isn’t tested and the report says so. Heat pumps still run in heating mode. This post on heat pumps and mini-splits covers what else the inspection looks at on those systems.
A few other things change in winter:
- Irrigation systems are usually shut down and drained, so they can’t be run.
- Pools are often winterized and covered. A covered pool limits what a pool inspection can see. This post on winterizing a pool in Portland explains what’s involved.
- Leaves, snow, or frost can cover grading, walkways, and the base of the siding.
- Standing water in a crawlspace can make parts of it unsafe to reach. The report says what couldn’t be accessed and why.
A wet-season inspection trades a few limits for a clearer look at how the house handles water. In a climate like this one, water causes many of the problems that matter most, so that trade is often a good one.
How to plan an inspection from October to April
A few things help the day go smoothly, and none of them take much effort.
- Ask the seller to keep all utilities on, including gas and the water heater
- Ask that the heat stay on, so the house is at normal temperature
- Make sure the crawlspace and attic hatches aren’t blocked by stored items
- Clear a path to the electrical panel, water heater, and furnace
- Leave extra time in your inspection window if the forecast looks rough
- Plan to arrive near the end for the walkthrough
That last point matters more in winter. The inspection takes 2 to 4 hours on site, about 3 on average. Buyers are encouraged to come near the end, when Russ walks through what he found with everything still in front of you. Waiting in a cold, wet yard for three hours doesn’t help anyone.
Reading the report afterward
Look for the section on limitations. Every report notes what couldn’t be inspected or tested and why. In winter, that section usually mentions the roof method, the cooling system, and anything covered by snow, leaves, or stored belongings.
Those notes aren’t filler. They tell you what’s still unknown. Sometimes the answer is a specialist evaluation. Sometimes it’s a question for the seller about how the item was used and maintained. And if your report points to a specialist evaluation, that’s the next step.
Most reports go out the same day. You can see what one looks like on the sample reports page, or schedule online. Trusted Home Inspections inspects seven days a week, rain or not.
Rainy Season Home Inspection FAQ
