July 16, 2026
If you can hear scratching behind your walls at night or keep finding tiny droppings in the attic, you're not alone. We get calls like this all the time from homeowners across the North Bay, and one of the first questions is usually, "How are you actually going to get the mice out?"
Most people picture walls being cut open or poison being scattered through the attic. In reality, professional mouse removal usually looks very different. The goal is to find how the mice are getting in, remove the active infestation, and keep them from coming back.
In this guide, we'll walk through how exterminators remove mice from walls and attics, when walls actually need to be opened, and what you can expect during the process.
In the North bay area, mice love finding entry points into homes for 3 reasons. It provides warmth, darkness, and easy food sources.Which makes the perfect spot for nesting. Mice are capable of birthing 35 babies per year, which means if one mouse finds an entry point into your home, you can be dealing with a full on mouse infestation within a few months.
The spot where you hear the scratching is not always where the mice are getting in. Activity may show up near the kitchen even though the opening is closer to the garage, crawlspace, or roofline. The size of the opening surprises most homeowners. A gap about the size of a dime around a pipe, vent, or damaged section of the roof may be enough. One mouse sighting can be difficult to judge. We pay closer attention when the scratching keeps returning or droppings begin showing up in different parts of the house.
Mice can pose real health risks for you and your family, and typically can cause expensive damage that stays hidden until a professional pulls back insulation or opens a wall panel.
When mouse droppings or urine have soaked into wall or attic insulation, we do not treat it like a normal cleanup. Our crew wears protective equipment and does not sweep or vacuum dry waste, since disturbing it can send contaminated dust into the air. Because homeowners can't see inside the walls, they often dont realize the amount of waste a mouse can leave in their insulation. Visible droppings may only be part of the problem. Especially if there is urine or nesting material has been sitting there for some time. After we remove the mice, we check whether the affected area can be cleaned or whether the insulation needs to come out. If the smell keeps returning, surface cleaning usually is not enough.
The damage caused by rodents in hidden spaces includes:
Because most contamination is hiding behind drywall or under attic insulation, homeowners often underestimate the scope until a professional inspection reveals the full picture.
We don't guess, we are specialized in rat and rodent removal from homes. we confirm rodent activity and map out the infestation in your home before any treatment begins.
Our team will ask you if you have been hearing sounds, such as scratching and gnawing noises in walls, the time of day they occur, and from which rooms or ceilings. From there, we go in and inspect attics and crawl spaces, since we know they are common entry points for mice and the most likely hiding spots.
Our team would check for mouse droppings along baseboards, near attic hatch openings, around insulation tunnels, on joists, and beside stored boxes. Mouse droppings can be very small, so they're easy to miss if you don't know what to look for. We also search for greasy rub marks along regular travel paths and gnaw marks on wood or wiring.
We start with the areas we can access, using flashlights and inspection mirrors to look behind stored items, along attic edges, and around tight openings. Thermal imaging or a small inspection camera may be used when the activity appears to be inside a wall and opening it up is not yet necessary. The evidence usually helps us determine what kind of rodent is active. Mouse and rat droppings differ in size, and the chewing and sounds they make can also point us in the right direction. While we are tracing the activity indoors, we also inspect the outside of the home. Roofline gaps, damaged vents, and openings around utility lines are common places for rodents to get into the structure.
For mice in walls, we definitely avoid simply poisoning and waiting. In our experience it leads to mice dying in your walls, which creates a very unpleasant smell that persistes for weeks. We opt for snap traps and multi-catch traps placed along known runways and behind appliances. Setting multiple traps is generally more effective than using just one or two, and traps should be placed every 6 feet for effectiveness along travel routes.
For attic mice, our technicians set trap lines along joists, around nesting areas in insulation, and near entry points. They place these traps perpendicular to walls with the trigger against the runway. We like to use peanut butter or chocolate as bait. A one-ounce bait block can kill up to 12 mice when used in tamper-resistant bait stations in appropriate other locations, but rodenticides are reserved for heavy, inaccessible infestations and must comply with label laws to protect children, pets, and other wildlife.
Our team comes back and reposition traps and adjust mouse bait placement over several visits, we keep following fresh droppings and chew marks until mouse activity stops completely. In the case of a severe infestation, wall sections or attic platforms may be opened to remove nests, especially where odors or heavy contamination persist.
Our job is not complete until every gap is sealed and food sources are addressed. Without exclusion work, new rodents will simply move back in.
We offer a full exterior inspection from foundation to roof, checking gaps around pipes, dryer vents, gas lines, cable penetrations, roof returns, soffits, and attic vents. You need to seal gaps larger than 1/4 inch to block mice entry, since mice can fit through openings as small as a dime.
Typical exclusion materials include:
One thing we see often is a homeowner sealing a hole near the foundation while the mice are actually getting in higher up. Tree branches touching the roof, damaged vent screens, or even a small roofline gaps that can lead into the attic. That is why we check more than the first opening we find. The roofline, vents, crawlspace, and utility gaps all need to be looked at before the job is considered finished. Food and storage around the home matter too. Cleaning those areas up will not remove mice already inside, but it helps after the entry points have been sealed.
Once the mice are gone, we recommend making sure your house safe and preventing future infestations.
We have an HEPA-filtering vacuum which a very safe and effective way of removing mouse droppings, as we mentioned previously, rodents carry disease and bacteria, so removing their feeces is critical. We may also recommend replacing insulation, especially if you had a bad infestation. In our most extreme cases we had to do a full attic remediation by pulling out all the insulation, deodorized and sanitized the wood framing, then re-add new insulation. We try to avoid breaking into walls unless there is visibly damaged or badly contaminated sections; otherwise we clean around baseboards, outlets, and access panels.
Reputable companies like ours schedule follow-up visits, using monitoring stations or tracking dust to confirm there is no ongoing rodent activity. Homeowners typically receive a maintenance checklist covering seasonal exterior inspections, trimming back vegetation, keeping firewood away from the house, and watching for new gnaw marks or droppings.
A mouse sighting near an open door may turn out to be a small, isolated problem. Scratching inside the walls or attic is harder to judge because the opening may be nowhere near the sound, and the mice may be moving through more than one part of the house.
Give us a call when traps have been out for several nights but fresh droppings or scratching keep returning. A strong urine smell, damaged insulation, or chewing around wiring can also point to activity that has been going on longer than it first appeared. North Bay Rat and Rodent handles hidden mouse activity throughout attics, walls, and crawlspaces across the North Bay. We start by finding the route and showing you what we found. From there, you receive a written plan for removal and exclusion, with warranty-backed repairs.
Light infestations can be brought under control in one to two weeks with aggressive trapping and sealing. Long-standing infestations in large attics or older homes can take three to six weeks of follow-up visits to fully clear, especially when insulation remediation or structural repairs are involved.
No. Your home is a perfect breeding place. Food, warmth, and darkness. Everything a mouse needs to thrive. If you think you have mice in your walls, you should call us.
In most cases, we can get rid of the mice in your home without major demolition. we can use traps placed at wall openings and confirmed travel routes. We would only open walls if there is severe damage, trapped odors from decay, or inaccessible mouse nests that cannot be reached any other way.
Our services can be performed while you remain at home. If rodenticides or heavy disinfectants are required, we will advise you with the temporary precautions such as keeping pets away from bait stations.
For us a successful job means several weeks with no new droppings, no scratching or scurrying sounds, and traps or monitoring stations staying empty.
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