No Mice Here Mouse-proof my house

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A field guide to sealing your home for good

It’s not a mouse problem. It’s a house problem.

Mice get in through gaps about the width of your finger. Find them, seal them for good, and they stop coming back. No poison, no monthly service.

Start Quick 3 3 spots, about 5 minutes Or do the full walk-around 10 spots, about an hour

Built by a rodent and wildlife exclusion specialist with 25+ years in the field, starting in Connecticut. No poison, ever.

The check is free, and the full-house plan is free while the free spots last.

  • Free check
  • No sign-up
  • No poison
  • A flashlight and 5 minutes to start
Illustration of a small mouse sitting calmly
Mice don't wait for cold weather. They work year round to find and use the gaps a house gives them.

✦ Mouse’s-eye tour

Take the mouse’s-eye tour.

Follow one mouse around a house like yours as it tries five ways in, then watch each one get sealed. Turn on Enhanced mode to play the full story with sound and a livelier 3D house.

Sound on, best with headphones.

Skip to the check

See how they get in

  1. Let’s get down to mouse size.

    Follow one mouse around a house like yours, and watch where it tries first.

  2. First stop: the garage door corner.

    The slab slopes just enough to loosen the bottom seal at the corners, and a small gap there is a way in. Keep the landing clear too, because even a half-inch rock can hold the seal open.

  3. Along the sill line.

    Where the house sits on the foundation, small gaps where boards meet are normal in construction.

  4. Up behind the corner post.

    Behind a vinyl corner post, out of reach of the rain, a hidden void can run all the way up to the soffit and into the attic.

  5. The AC line hole.

    The hole in the wall is often bigger than the lines. If your finger fits, a mouse can get in.

  6. Up at the roof return.

    Mice climb. Where one roof meets another, just below the flashing, a gap can lead straight into the attic.

  7. Now, seal them.

    Metal, hardware cloth and exterior-grade sealants or adhesives over each gap. The mouse bumps a sealed corner and turns back.

Skip the story

When in doubt, seal em out.

Check my house Or do the full walk-around

How it works: Check Plan Seal Mouse-proof

Where they get in, highlighted.

Tap a number to label a spot. These 10 are the usual suspects on most houses, two of them round the back.

Illustrated house with common mouse entry points marked in highlighter 10 marked spots: Roofline, soffit and fascia, Roof returns, Where building materials meet, Pipes and AC line sets, Utility penetrations, Foundation and sill line, Garage door corners and bottom seal, Porches and stoops, and at the back of the house, Low decks, Bulkhead and cellar doors. Use the numbered buttons to read about each one. BACK OF THE HOUSE X-ray of the same house, with the hidden spaces mice travel marked in highlighter The walls and roof drawn see-through. Inside, 5 marked hidden spaces: A, the basement, along the ledge on top of the foundation wall inside the wood sill. B, the garage, along the walls at the floor line. C, the attic, tunnels through the insulation that start at the corners. D, a vinyl corner post, open at the bottom, as the path up to the attic corner. E, the utility chase, where the lines come through the wall and run inside it. Use the lettered buttons to read about each one. X-RAY: HIDDEN SPACES X-ray of the same row of three homes, with the hidden spaces mice travel marked in highlighter The walls and roof of the building drawn see-through. Inside, 7 marked hidden spaces: A, the shared walls between homes, at the floor line and the outlets. B, pipes through the shared walls and floors, under the sinks and behind the stove. C, the shared pipe chase from the basement up past every floor. D, the shared attic, through the insulation and over the top of each divider. E, the basement sill ledge, round the whole building. F, the meter bank, where the lines come in and run to each home. G, a garage beside the next home, along the walls at the floor line. Use the lettered buttons to read about each one. X-RAY: HIDDEN SPACES

Based in part on the CDC's checklist of places to look.1 See every entry point, with a how-to for each

✦ Enhanced mode · Story walkHow I get inFollow a mouse around the house and see every way he gets in.Start the walk →
Real houses

Real gaps, sealed

Here are some of those entry points on real houses we’ve inspected. The highlighter shows where a mouse would get in. Tap or click a before and after photo to see the same spot sealed.

  • Close-up of a roof return on a shingle roof, where the weathered trim meets the shingles with a dark gnawed opening under it. Before
    Roof return: a gnawed opening where the trim meets the shingles. Out of sight from the ground, and wide open.How to fix it: Roof return
  • Looking up at an eave corner: a dark open slot runs down the fascia where it meets the soffit.Before
    The same eave corner after sealing, seen from a different angle: the fascia and soffit meet with no opening.After
    Eave corner: before, an open slot where the fascia meets the soffit. After, the same corner closed (shot from a different angle).How to fix it: Roofline and soffit
  • A stepped fascia corner where two roof lines meet, with a dark gap at the corner just above the lower roof edge.Before
    The same stepped fascia corner after sealing, seen from a different angle: the corner is closed.After
    Stepped fascia corner: before, a gap where two roof lines meet. After, the same corner closed (shot from a different angle).How to fix it: Roofline and soffit

See all the real examples

Before and after photos from real homes we've inspected and sealed, with the entry point marked in highlighter. Cropped so nothing identifies the house.

Who pays for it

Every bait box has a guest list.

Owls and hawks

The animals that hunt mice for free are the ones poison hits hardest. Hawks and owls face high secondary poisoning risk from the strongest anticoagulants.

NPIC rodenticide fact sheet4

Cats and dogs

Dogs dig for flavored bait. Cats eat what they catch.

NPIC4

Kids

The EPA warns rodent poisons can harm children and requires tamper-resistant stations where kids may be.

Mice come in for shelter and leave allergen in the dust. A national survey found it in 82% of U.S. homes, and in preschoolers with asthma who are allergic to mice, more allergen at home meant more days with symptoms.

EPA3 · NIEHS survey8 · Johns Hopkins study9

Your home

A mouse that dies in a wall void leaves an odor you can't reach and a sanitation problem behind the drywall.

UC IPM2

The cycle

Poison kills a few mice and leaves the opening. More come in, and you pay for it again and again.

Pest control came, still have mice? →

The pledge

Poison doesn’t close the gap.
Sealing does.

Find your gaps this weekend. Quick 3 takes about 5 minutes. Or send photos and I’ll mark each gap, what to seal it with, and the order to do it in. Free.

Start Quick 3 Send photos for a free plan
Paul Trapp
Paul Trapp · 25+ years sealing out mice, no poison

I look at every plan myself. You’ll hear back within 24 hours.

One gap? Send a photo · Share the pledge · Questions