How to Rodent-Proof a San Francisco Home Before the Rainy Season

Rodents look for three things: a way in, a place to hide, and easy access to food or water. Before wetter weather arrives in San Francisco, a short exterior-and-interior check can help homeowners spot conditions that deserve attention.

Start at the exterior entry points

Walk the foundation, garage, utility penetrations, vents, roofline, and doors. Look for gaps around pipes and cables, torn screens, worn door sweeps, and openings where different building materials meet. Photograph anything you are unsure about so it can be reviewed later.

Reduce food and water access

Store dry goods and pet food in sealed containers, clean up fallen fruit and birdseed, and keep outdoor bins closed. Repairing a persistent drip and avoiding standing water near the home can also reduce the conditions rodents use.

Check storage, garages, and crawlspace areas

Cardboard, clutter, and dense stored items can make signs harder to see. Keep stored materials raised where practical and leave a visible path along walls. In crawlspaces or attics, avoid disturbing electrical, plumbing, or insulation systems; note observations and arrange a professional assessment when access is limited.

Know when to call a professional

Scratching sounds, fresh droppings, gnaw marks, damaged insulation, or recurring activity can indicate that a more complete inspection is needed. A professional exclusion plan should identify accessible entry points and explain which repairs are appropriate for the property.

ASAP Rodent Exclusion Pro serves San Francisco-area property owners with rodent-control and exclusion services. To discuss the conditions you have observed and request an inspection, visit ASAP Rodent Exclusion Pro.