Mice season in Markham:Mice are moving in now — the first cold nights push them toward furnace rooms and garages. Same-week inspections are booking now.
Call (705) 302-1887
Mice Control in Markham
From heritage homes in Unionville to dense townhouse blocks in Cornell and Berczy, Markham gives mice two very different ways in: aged foundations with settled gaps, and shared townhouse walls where one untreated unit re-seeds the whole row. Licensed, guaranteed, owner-operated.
Mice Problems in Markham? Here's How We End Them.
From heritage homes in Unionville to dense townhouse blocks in Cornell and Berczy, Markham gives mice two very different ways in: aged foundations with settled gaps, and shared townhouse walls where one untreated unit re-seeds the whole row. Sani IQ's Markham technician is based in the area, knows both housing types, and treats the cause — entry points and travel routes — not just the symptoms.
Signs You Have Mice in Your Markham Home
- Droppings under the kitchen sink or along garage walls
- Scratching in shared townhouse walls at night
- Chewed pantry packaging or pet food bags
- Musky odour in closets, pantries, or utility rooms
- Recurring activity even after store-bought traps
Mice already inside? The Sani IQ Rodent Program removes them and keeps them out: $445 at the first visit, then $150 a quarter (homes up to 2,000 sq ft) — inside and outside stations, seal-up at week 3, quarterly inspections, 12-month warranty.
Get a Free Mice Quote in Markham
Tell us what you're seeing — we usually reply within the hour with an exact price.
Recommended plan
Stop mice coming back in Markham: Sani IQ Rodent Program — $445 at the first visit, then $150 a quarter
Mice inside? The Rodent Program removes them in three weeks, seals how they got in, and keeps the stations in all year with a 12-month warranty. Just want them kept out? Protect includes rodent prevention. Free re-service between visits, a photo report every visit, cancel any time.
Our Process
How Sani IQ Handles Mice in Markham
Full inspection + entry-point map
Exterior foundation, garage seals, utility lines, weepers, attic and kitchen kick-plates — we document every gap a mouse can use (a dime-width, about 6 mm, is enough). Most homes have 8–15 the owner has never noticed.
Treat first — exit routes stay open
Interior treatment plus tamper-resistant exterior bait stations, placed on the evidence (droppings, rub marks, gnaw patterns). We deliberately do NOT seal on day one, so mice leave the structure and die outside — not in your walls.
Return visit (~3 weeks): verify, then seal
Once activity has stopped we come back, confirm the knockdown, and seal the entry points with galvanized steel mesh, steel-wool-backed sealant and weatherstripping. Sealing at the right time is the step most companies get wrong.
Keep them out + 12-month warranty
Stations stay in and are serviced every quarter; freeze-thaw and settling open new gaps, so we re-inspect and reseal on every visit. Mice return inside the warranty? So do we — at no charge.
Where They Get In
The 8 Ways Mice Get Into Markham Homes
Our inspections in Markham find 8–15 entry points on a typical house. These are the ones that show up again and again — and the ones we seal at the ~3-week return visit, once the mice are out.
- 1 Garage door bottom seal — Worn weatherstrip = open door
- 2 Weepers & foundation cracks — 6 mm is enough
- 3 Utility & A/C line penetrations — Gas, hydro, cable, condensate
- 4 Dryer & bathroom vents — Missing or stuck flaps
- 5 Soffit & fascia gaps — Climb via downspouts and vines
- 6 Roofline & attic vents — Then straight down the wall voids
- 7 Window wells & sill gaps — Basement windows left ajar
- 8 Cantilevers & deck ledgers — Open-bottom overhangs
Identify what you're seeing: house mouse vs deer mouse · Before your visit: how to prepare for a mice treatment
🛟 SANI IQ HELP CENTRE
Booked in? Here's exactly how to get ready.How to prepare for your mice treatment — written by our licensed technicians so your treatment works the first time.
Rated 5 by 158+ Ontario Customers
"Sani IQ came the same day I called. Technician was professional, explained everything, and our ant problem was completely gone within 48 hours. Highly recommend!"
Sarah M. — Barrie, ON"Had a serious mouse problem before winter. Sani IQ sealed every entry point and set up monitoring stations. Zero issues since. Worth every penny."
Michael T. — Barrie, ON"Cockroaches in the kitchen — nightmare. Sani IQ handled it fast and discreetly. Back to full health compliance. These guys know what they're doing."
James R. — Toronto, ONCommon Questions
Mice Control in Markham — FAQs
How much does mice control cost in Markham?＋
Mice inside in Markham? The Sani IQ Rodent Program is $445 at the first visit, then $150 a quarter for homes up to 2,000 sq ft: removal in three weeks, every entry point sealed, stations kept in all year with quarterly inspections and a 12-month warranty. Bills after each visit — no monthly fees. Prefer one visit pair? One-Time Mice is $495 with a 60-day warranty.
My townhouse keeps getting mice — why?＋
In Markham townhouse rows, mice travel between units through shared wall voids and pipe chases. Treating one unit without sealing it just invites the next wave. We treat your unit and seal your envelope, and can document findings for your property manager or neighbours.
Is your team local to Markham?＋
Yes — one of our senior technicians is based in Markham, which is why same-day windows are usually available across Markham, Unionville and Milliken.
Are the treatments pet-safe?＋
Yes. Locked, tamper-resistant stations and Health Canada–registered products only — we'll show you every placement before we leave.
Why don't you seal the entry points on the first visit?＋
Because sealing first traps mice inside — they die in wall voids and you get the smell for weeks. Our exit-first protocol treats on day one with exit routes open so mice leave and die outside, then we return in about three weeks to verify the knockdown and seal. Sealing is included; it's the sequence that matters.
Will the mice leave on their own once it gets cold or warms up again?＋
No. Mice move in for warmth and food in October–November and, once established, a house is better than outdoors in every season. A population that has nested inside grows through winter — a female can have 5–10 litters a year. Waiting makes it a bigger job, not a smaller one.
How will I know they're actually gone?＋
You'll see it in the evidence: no fresh droppings, no new gnawing, no night-time scratching. We confirm it at the ~3-week return visit before sealing, and the quarterly station checks catch any new exterior pressure before it becomes an indoor problem again.
How should I prepare for a mice treatment visit?＋
Very little — clear access to the kitchen kick-plates, under-sink cabinets, furnace room and garage walls, and keep pets away from the areas we're working in. Our Help Centre has a short checklist: how to prepare for a mice treatment (saniiq.com/helpcentre/prepare-for-mice-treatment/).
More Markham Services
Other Pest Services in Markham
Dealing with more than one pest? We run a dedicated, guaranteed program for each — same owner-operated team across Markham.
View all our Pest Control Services in Markham. Learn more about our Mice & Rodent Control methods across Ontario.
Related: Pest Control Markham · Mice Control Toronto · Plans & Pricing
End Your Mice Problem in Markham
Mice programs from $445 at the first visit · Protect from $249 a visit. Billed after each visit — no monthly fees. Cancel any time.