What Happens During a Bat Inspection? A Homeowner Walkthrough

A bat inspection is a careful look at your building, outside and in, to find where bats are getting in, where they are roosting, roughly how many there are, and what it will take to seal the house for good. It is free, there is no obligation, nothing is sprayed and no bats are handled. You get a plain explanation and a clear quote at the end.

If you have found this page, you have probably heard something in the ceiling, or seen a bat in the living room, and now you are trying to figure out what you are signing up for before you book. That is a reasonable thing to want.

How to prepare for a bat inspection

The inspection starts before anyone arrives. A few questions when you book tell us a lot about where to look:

• When do you hear the noises? Bats are most active around dusk and just before dawn. Scratching at those times points to bats. Noise at noon usually points to something else.
• Where in the house? A bedroom ceiling, a corner of the attic, a particular wall. The location narrows the search.
• Have you seen bats leaving at dusk? If you have watched them come out of a corner of the roof, you have already done half our job.
• Has one been inside? A bat in a living space tells us the colony has a route from the roost into the house, and that changes how we plan the sealing.
• How long has it been going on? A few weeks and a few years are very different situations for cleanup.

Two things to have ready on the day:

1. Clear access to the attic hatch. If it is in a closet, move the boxes. If it is in a garage ceiling, make sure the ladder can go up.
2. A short note of where and when you hear activity. You do not need a diary, just “back bedroom ceiling, around 9 p.m., most nights.”

And the one thing not to do: do not seal anything yourself before the inspection. It is tempting to stuff a gap with foam or steel wool the moment you find it. But a sealed exit with bats still inside does not solve the problem. It sends them looking for another way out, and that way out is often into your living space. Leave every gap exactly as it is until someone has looked at the whole roofline.

What the inspector looks for outside the house

The first part of the visit is outside, walking the building slowly and looking up. This is where most of the answers are. An inspector is looking for two kinds of evidence: the openings themselves, and the marks bats leave around them.

The openings. Bats do not chew their way in. They use gaps that are already there, and a gap the width of a finger is enough. The usual suspects on Ontario homes are:

• Where the soffit meets the fascia, especially at corners
• Gable vents with loose or missing screening
• Ridge caps and the ends of ridge vents
• Chimney flashing that has pulled away from the brick
• Dormers, where several rooflines meet and rarely line up perfectly
• Loose or lifted flashing anywhere on the roof
• Gaps where utility lines, cables or vent pipes pass through the wall

If you want the full picture of how these gaps form, how bats get into a house goes through each one.

The marks. Bats squeeze through the same opening every night, and their fur leaves a dark, slightly greasy rub mark around the edges over time. Urine can stain siding below an opening. Droppings stick to the siding under a gap or pile up on the ground, a deck or a window sill directly below it. On a bright day, these marks are often visible from the ground with a good look, and they are the most reliable sign that a gap is being used rather than just sitting there.

The roofline walk also tells us something about where the colony is likely living. Bats that enter at a gable vent often roost in the open attic. Bats that enter at a soffit corner may be living in the soffit itself or in the wall below it. Where bats roost explains the difference and why it matters for the sealing plan.

Why we sometimes watch the house at dusk

Sometimes the roofline walk gives a clear answer. Sometimes it does not. Older homes with complex rooflines, dark siding that hides staining, or recent rain that washed away droppings can all leave room for doubt.

When that happens, the next step is simple: watch the building as the bats come out. Shortly after sunset, bats leave the roost to feed. Standing outside with a view of the suspected wall shows exactly where they exit, and counting them as they come out gives a realistic read on colony size. If you want to understand what those numbers usually mean, how many bats are in my attic covers it.

Depending on what time of day the inspection is booked, the dusk watch may happen on the same visit or on a second, short one around sunset. It is not a delay tactic. It is the difference between sealing the right gap and sealing the wrong one.

What the inspector looks for in the attic

With the outside done, the inspection moves to the attic. This is the part homeowners tend to worry about most, so here is what actually happens: someone climbs up through the hatch with a flashlight and looks. Nobody chases anything. Bats roosting in the attic during the day are tucked up in the peak or behind the roof boards, and they almost always stay put while we look.

What we are looking for:

• Droppings and their pattern. Bat droppings look like dark rice grains and crumble to dust when disturbed, because they are made of insect parts. Leave them alone; there is no need to touch anything. Where they land tells us where the bats hang. A tight pile under one spot in the peak means a small roost in one place. A long trail along a wall means bats moving between a roost and an exit. The bat droppings identification guide shows what to compare against.
• Urine staining. Roost areas develop dark, stained patches on the wood and a white, crusty residue on the insulation below.
• Odour. A long-standing colony has a distinct musky, ammonia-like smell that a fresh one does not. That helps date the problem.
• Insulation. Whether the droppings are sitting on top of the insulation in one area or are worked through a wide section. This is what decides whether cleanup is part of the job or not.
• Where the bats actually are. Not every colony lives in the open attic. Many roost inside the soffit or in a wall void where the attic floor meets the outside wall. If the droppings are concentrated at the very edge of the attic, or if the attic looks clean but you hear scratching in a wall, that is a soffit or wall roost, and the exclusion has to be planned around it.

Some homes have no attic hatch at all, or a cathedral ceiling with no attic to speak of. In those cases the outside evidence and the dusk watch carry more weight, and we say so rather than pretending to have seen something we could not.

Bat inspection checklist: what we look at and what it tells us

Here is the whole inspection on one page, and what each piece of evidence actually tells us.

What we look at	What it tells us
Roofline gaps	Every possible entry point, and how much sealing the whole house needs
Staining and rub marks	Which gaps bats are actually using right now
Droppings outside	Confirms an active entry directly above and gives a rough sense of traffic
Dusk emergence	The exact exit point and a straight count of the colony
Attic droppings pattern	Where the roost is, how long it has been there, and whether bats are in the open attic or a soffit or wall void
Insulation and odour	Whether cleanup is needed and how much of the attic it involves

What you get at the end of the inspection

Before anyone leaves, you get a plain-language explanation of what was found. No mystery, no jargon. Specifically:

• Where they are getting in, pointed out on the building so you can see it yourself
• Where they are roosting, whether that is the open attic, the soffit or a wall
• A realistic read on colony size, from the evidence and the dusk count if one was done
• The timing. If it is maternity season, roughly May to early August, the honest answer is “not yet.” Flightless pups cannot leave through a one-way door, and several Ontario bat species are endangered and protected, so sealing them in is against the law. Maternity season and why timing matters explains the reasoning. Right now the window is open. It runs from mid-August through October, so the work can go ahead as soon as you approve the quote.
• What sealing the whole roofline involves. Not just the gap they are using today, but every gap they could use tomorrow. Bats that lose one entrance look for another, so partial sealing rarely holds.
• Whether cleanup is needed, and if so, how much of the attic it covers
• A clear quote for the exclusion and any cleanup, walked through with you so you understand what each part is for

What humane bat removal costs in Grey Bruce Simcoe explains what drives the quote up or down.

What a bat inspection is not

It helps to be clear about this, because bats make people nervous, and it is easy to feel pressured when you are worried.

• No chemicals or repellents. Nothing is sprayed, fogged or scattered in your attic. Repellents do not solve a bat problem; at best they move the colony to another part of the house.
• No bats removed that day. Finding the gaps and planning the sealing is the job; the bats leave on their own through one-way doors once the work is booked.
• No invented urgency. If the roost is small and the timing is right, we will say so. If it is maternity season and you need to wait, we will say that too. You will not hear that the house is about to be overrun or that you have to decide on the spot.

What happens next if you go ahead

Once you have seen the quote and decided to proceed, the humane exclusion follows a set order:

1. One-way doors go over the active entry points. Bats leave at dusk to feed as usual and cannot get back in. Nothing is trapped, nothing is touched.
2. Whole-house sealing closes every other gap on the roofline.
3. Waiting and removal of the doors. Once the colony has left, the one-way doors come down and those last points are sealed permanently. How long bat exclusion takes walks through the full timeline.
4. Cleanup, if the inspection found contaminated insulation, is handled as a separate attic cleanup and decontamination step once the bats are out.

Every sealed point on the house is covered by our transferable Lifetime Warranty. If a bat ever re-enters through a point we sealed, we come back and do the work at no charge, forever. If you sell the home, the warranty passes to the new owners.

Book a free inspection

If you are hearing scratching at dusk anywhere in Grey, Bruce, Simcoe or Huron counties, the fastest way to stop worrying is to find out exactly what is going on. Book a free, no-obligation inspection through our bat removal and exclusion page. We will look at the building carefully, inside and out, tell you plainly what we found, and give you a clear quote for sealing it permanently with a Lifetime Warranty behind every point. The exclusion window is open now, so there is time to do this properly without rushing.