Scratching Sounds in Walls or Ceiling — What It Means and What to Do
Scratching, scurrying, or thumping sounds inside your walls or ceiling almost always indicate a rodent infestation. In Granite Bay and surrounding Placer County, roof rats and house mice are the most common culprits — and the sounds stop only when the animals are removed and the entry points are sealed.
What Is Making the Scratching Sound?
The character of the sound gives strong clues about the animal. Roof rats are the most common source of scratching noises in Granite Bay homes — they nest and travel in attic spaces and wall voids, and their movement produces a fast, light scratching or scurrying sound, often accompanied by rolling sounds (from cached food items) and occasional chattering. Activity is typically strongest at night, between dusk and 2 a.m.
House mice produce similar but lighter, higher-pitched scratching sounds. They are more active in wall voids at the base of walls, inside cabinets, and in crawl spaces, and they may be heard at any hour. Squirrels, which are diurnal, produce heavier thumping or running sounds in the attic during daytime hours. The inspection and treatment approach differs by species, which is why correct identification matters.
Fast Scurrying at Night
Light, rapid movement sounds in the attic or ceiling between dusk and midnight strongly indicate roof rats — the predominant rodent in Granite Bay’s oak-canopied neighborhoods.
Scratching Inside Walls
Scratching sounds within wall cavities, especially near baseboards or behind appliances, typically indicate house mice using the wall void as a travel and nesting corridor.
Heavy Thumping Overhead
Heavier, slower movement sounds in the attic during daylight hours suggest squirrels rather than rats. The response and exclusion materials differ between species.
Rolling or Dropping Sounds
A rolling sound in the attic — often compared to a marble rolling across the floor — is characteristic of roof rats caching acorns or other food items near their nest.
How We Stop the Sounds Permanently
Species Identification and Inspection
We inspect the attic, wall voids, crawl space, and exterior of your property to identify the rodent species, locate the active population, pinpoint every entry point, and assess the extent of any nesting or damage. Knowing the species determines which entry points are being used and the correct exclusion approach.
Population Reduction
We place tamper-resistant traps in attic spaces, wall void access points, and along travel routes to reduce the active population before exclusion begins. This step is essential — sealing entry points without it risks trapping animals inside the structure.
Permanent Exclusion
Every identified entry point is sealed with professional-grade materials that rodents cannot chew through — galvanized hardware cloth, copper mesh, sheet metal, and caulk applied at roofline gaps, utility penetrations, foundation voids, and soffit transitions. This is what permanently stops the sounds.
Sanitation and Harborage Assessment
We identify exterior conditions that attract rodents to the property — overhanging branches, dense groundcover, outdoor food sources — and provide specific recommendations for your property’s layout and surrounding environment.
Verification Follow-Up
After exclusion, a follow-up confirms the sealing is holding, traps are clear, and no new sounds or activity have appeared. We document all work and provide a written report.
If you are still in the planning stage, review the full exclusion process, step by step, to understand exactly what that sealing work covers before scheduling.
Hearing sounds and seeing other signs too? See our signs of rodent infestation guide to check the full list before your inspection.
Scratching Sounds in Walls — Frequently Asked Questions
Hearing Scratching in Your Walls? Get a Quote Today.
A matched licensed specialist inspects your home, identifies the species, locates every entry point, and stops the sounds permanently. Serving Granite Bay and all of Placer County.