# Mice in the attic in Calgary > Mice in your Calgary attic? They get in at soffits, roof vents, flashing and utility penetrations. We find and close the gap. $100–$1,500 depending on the severity of the infestation and the scope of exclusion, GST extra. Inspection is complimentary when you proceed with the recommended service. Canonical: https://www.frameworkpest.ca/attic-mice-calgary/ Last updated: 2026-10-27 Mice · Attic Calgary and area · Fully licensed and insured Mice in a Calgary attic almost always came in at the roofline: soffit returns, roof vents, flashing gaps and utility penetrations. We find the gap, close it with metal and sealant that survive freeze-thaw, and deal with the mice already inside. Framework Pest is fully licensed and insured. [Request a written quote](https://www.frameworkpest.ca/contact/) [Call 825 747 5787](tel:+18257475787) [Text a photo](sms:+18257475787) Typical mouse exclusion visit: $100–$1,500 depending on the severity of the infestation and the scope of exclusion, GST extra. Inspection is complimentary when you proceed with the recommended service. _Photo: Jason Dale, [CC BY-SA 3.0](https://commons.wikimedia.org/wiki/File:AtticInsulation.jpg), via Wikimedia Commons_ ## Where they get in - **Soffits:** soffit returns, loose panels, and the brick–soffit seam - **Roof vents:** roof, bath and kitchen vents without metal screens - **Flashing:** gaps where a lower roof or garage roof meets the house wall - **Utility penetrations:** plumbing stacks, cables and satellite lines A house mouse fits through a gap of about 6 mm ([Penn State Extension](https://extension.psu.edu/is-there-a-mouse-in-the-house-eliminate-mice-with-ipm); [Pest Control Technology](https://www.pctonline.com/)). _Photo: Achim Hering, [CC BY 3.0](https://commons.wikimedia.org/wiki/File:Caulking.jpg), via Wikimedia Commons_ ## How it happens Mice climb siding, downspouts and trees, then follow warm air leaking out at the roofline. Calgary’s Chinook swings can take a wall through several freeze-thaw cycles in one winter, and each cycle works sealant and trim joints loose. A joint that was tight in July can be open by February. ## What we do 1. Inspect the roofline and attic hatch, and name the droppings before anything is sealed. 2. Treat what is already inside, with methods planned around who lives in the house. 3. Close each joint with copper mesh, sealant that moves, or metal screens. Not foam alone. 4. Photograph each closed joint and give you a written report: what we closed, what is still open. _Photo: Bailes, Penny Rogo, [Public domain](https://commons.wikimedia.org/wiki/File:Detail_view_of_north_front_roof_gable_decoration_of_1930_West_Laurel_Street,_facing_southeast._-_1930_West_Laurel_Street_(House),_Tampa,_Hillsborough_County,_FL_HABS_FL-483-9.tif), via Wikimedia Commons_ ## What you can do today - ☐ Look for droppings near the attic hatch with a flashlight; do not stir up insulation. - ☐ Check that roof and bath vents have intact metal screens (from the ground, with binoculars). - ☐ Trim branches that touch the roof. - ☐ Note when and where you hear noises: dusk scratching overhead points to the roofline. ## Guarantee The [Gap Guarantee](https://www.frameworkpest.ca/guarantee/) covers re-entry through a specific joint we closed and documented, during the first freeze-thaw season after the visit. It is not a whole-house seal. Background reading: [exclusion vs bait stations](https://www.frameworkpest.ca/insights/exclusion-vs-bait-stations/). ## Related reading - [mouse-proofing service for Calgary homes](https://www.frameworkpest.ca/mouse-proofing/) - [mouse control in Calgary](https://www.frameworkpest.ca/pests/rodents/) - [Framework Pest home](https://www.frameworkpest.ca/) - [bat guano vs mouse droppings in the attic](https://www.frameworkpest.ca/insights/attic-droppings/) - [the brick–soffit seam where mice get in](https://www.frameworkpest.ca/insights/brick-soffit-mouse-entry/) - [garage door seals that stop mice](https://www.frameworkpest.ca/garage-door-seals-calgary/) - [attic sealing in Calgary vs Airdrie](https://www.frameworkpest.ca/attic-sealing-calgary-vs-airdrie/) - [what mouse proofing costs in Calgary](https://www.frameworkpest.ca/mouse-proofing-cost-calgary/) - [humane mouse control in Calgary](https://www.frameworkpest.ca/humane-mouse-control-calgary/) ## Questions ### How do mice get into the attic? Almost always at the roofline. The usual spots are soffit returns, roof and bath vents without metal screens, gaps at flashing where roof meets wall, and utility penetrations such as plumbing stacks and cables. A house mouse fits through about 6 mm. ### Is my attic insulation ruined? Not always. Light droppings in one area can often be cleaned up. Heavily soiled or matted insulation is a job for an insulation contractor, and we will tell you if that is what we see. ### What if the insulation looks like vermiculite? Stop and do not disturb it. Vermiculite can contain asbestos, and it needs an abatement firm before anyone works in that attic. ### When do mice move into Calgary attics? Most homeowners notice them from late August through the first hard frosts, when mice look for warm shelter. Sealing before fall is ideal, but it is worth doing any month the roofline is safe to reach. ### How much does attic mouse work cost? A typical mouse exclusion visit is $100–$1,500 depending on the severity of the infestation and the scope of exclusion, GST extra. Inspection is complimentary when you proceed with the recommended service. Larger roofline jobs get a written quote that names each joint. ### Will you guarantee they never come back? No, and nobody honestly can. The Gap Guarantee covers re-entry through a specific joint we closed and documented, during the first freeze-thaw season after the visit. It is not a whole-house seal. ## Show us the gap. Text a photo, call, or request a written quote. [Request a written quote](https://www.frameworkpest.ca/contact/) [Call 825 747 5787](tel:+18257475787) [Text a photo](sms:+18257475787)