When Should You Call an Exterminator for Ants in Your House?

Seeing one ant does not automatically mean that your home has an established infestation. Ants can enter through an open door, damaged screen, foundation crack, utility opening, or another small gap while searching for food, moisture, or shelter.

The situation becomes more concerning when ants continue to appear after accessible food has been removed and surfaces have been cleaned. Persistent activity may mean that worker ants have established a regular route between a food or water source and a nest located inside or near the property.

Shepp Pest Control helps homeowners and businesses throughout Chicago and the surrounding suburbs identify the source of ant activity and select treatment based on the species, nesting location, access routes, moisture conditions, and severity of the problem.

For a broader overview of pests commonly found in the region, read The Complete Guide to Common Household Pests in Chicago .

Signs It Is Time to Call an Exterminator for Ants

When a Few Ants May Not Require Professional Treatment

Professional treatment may not be necessary every time a single ant enters a house. Temporary activity can occur after heavy rain, during hot and dry weather, or when landscaping and soil near the building have been disturbed.

Monitoring may be reasonable when:

• Only one or two ants have been seen
• The ants appeared directly beside an open door or window
• No established trail is visible
• The activity stops after food residue is cleaned
• No ants are emerging from walls, cabinets, or trim
• No winged ants, wood debris, or moisture damage are present

Continue watching the area rather than assuming the issue is permanently resolved. If the ants return or the number of ants increases, the pattern may help a pest-control professional understand where they are entering.

When Ant Activity Suggests an Established Infestation

An infestation is more likely when ants repeatedly travel along a predictable route. Worker ants leave the colony to locate food and moisture, then return to the nest. Depending on the ant species, these routes may pass through small gaps that are difficult for a homeowner to see.

Common ant travel routes include:

• Floor and wall junctions
• Cabinet edges and countertop seams
• Openings around water and drain pipes
• Window and door frames
• Basement and foundation cracks
• Electrical, cable, and utility penetrations
• Spaces beneath siding and exterior trim

Should You Call an Exterminator for Ants in the Kitchen?

Kitchen ant activity should be addressed promptly because the room provides food, water, warmth, and protected access behind cabinets and appliances.

Crumbs, grease residue, pet food, leaking plumbing, and condensation can support continued foraging. Ants may also move through openings around sinks, dishwashers, refrigerator water lines, cabinets, and baseboards.

Before requesting service, clean accessible food residue, store pantry goods in sealed containers, wipe beneath small appliances, and inspect for plumbing leaks. Avoid disturbing every visible trail immediately before an inspection because its location may help identify the ants’ route.

When Large Ants Require Closer Attention

Large ants inside a Chicagoland property may be carpenter ants. Carpenter ants do not consume wood like termites. They excavate wood to form nesting galleries and often select wood affected by moisture, decay, leaking water, or prolonged dampness.

Professional inspection becomes more important when large ants repeatedly appear near:

• Window and door frames
• Roof edges, soffits, and fascia
• Bathrooms and plumbing lines
• Basement framing and sill plates
• Dishwashers, sinks, and laundry areas
• Porches, decks, and exterior wood
• Areas with staining, leaks, or softened wood

Other warning signs can include coarse wood debris beneath an opening, several winged ants emerging indoors, and repeated nighttime activity.

DIY Ant Control Versus Professional Ant Control

Why Store-Bought Ant Spray May Not Solve the Problem

Many store-bought sprays are designed to kill insects that contact the treated surface. This can remove individual ants, but it does not necessarily reach the colony responsible for the ongoing activity.

A treatment may appear successful for several days before ants return through the same opening or establish a different route. Results depend on the ant species, colony structure, nesting location, moisture sources, sanitation conditions, and how the product affects worker behavior.

Using several products at the same time can also complicate the problem. Repellent sprays may interfere with baiting methods, while treatments applied in the wrong location may never reach the nest.

What an Ant Exterminator Looks for During an Inspection

Effective ant control begins by understanding the property rather than treating every ant complaint in the same way. During an inspection, Shepp Pest Control may evaluate the visible activity and the conditions that allow ants to enter, forage, and nest.

What Professional Ant Treatment May Involve

The appropriate treatment depends on what the inspection reveals. Not every property needs the same product, service area, or follow-up plan.

A professional ant-control strategy may involve:

• Treating active travel or nesting areas
• Using ant-specific bait where appropriate
• Addressing exterior activity near the building
• Identifying moisture or sanitation conditions
• Recommending practical exclusion improvements
• Monitoring areas where activity has been recurring
• Scheduling follow-up service when conditions require it

Shepp Pest Control bases its recommendation on the conditions found at the property rather than assuming every ant problem has the same source.

How to Prepare Before the Exterminator Arrives

1. Record where the ants appear. Note the rooms, surfaces, and approximate times of day.
2. Take clear photographs. Close photographs of the ants and wider photographs of the affected area may be helpful.
3. Explain what you have already used. Provide product names and identify where they were applied.
4. Clean ordinary food residue. Remove crumbs, grease, spills, and exposed pet food without disturbing every visible route.
5. Report moisture problems. Mention plumbing leaks, roof leaks, condensation, damp basements, or damaged exterior wood.
6. Provide access to affected areas. Make it easier to inspect beneath sinks, around appliances, along basement walls, and near reported activity.

When to Request Professional Ant Control

Ant Control for Businesses and Rental Properties

Ant activity in a commercial or multi-unit property can become more complicated because food, moisture, waste handling, shared walls, utility routes, and neighboring units may all affect the infestation.

Business owners, landlords, and property managers should consider professional service when ants appear in:

• Commercial kitchens and food-storage areas
• Restaurants, cafés, and employee break rooms
• Apartment kitchens and shared laundry rooms
• Office kitchens and reception areas
• Retail stores and customer-facing spaces
• Warehouses and product-storage areas
• Trash, recycling, loading, and receiving areas

Shepp Pest Control provides residential and commercial pest-control service throughout Chicagoland. The team can evaluate the affected property and recommend service based on the type of building and the conditions found during the inspection.