Help With Fly Problems

Find where the flies are coming from

Flies at the windows, tiny ones by the sink, or a sudden swarm? Tell us what you've noticed and ask about an inspection or a quote.

A few details help: where you see flies, when they appear, and how long it has been going on.

House fly resting on a window screen
House flies clustered on a kitchen window sill

Why do flies keep coming back?

Flies don't come from nowhere. House flies breed in trash, compost and pet waste. Drain flies grow in the slime inside drains. A sudden swarm of big, shiny flies usually means something died nearby. Find the source and the flies stop.

That's why good fly control starts with a look around, not a spray. Clean or remove what they're breeding in, close the gaps they use to get in, and use traps to confirm they're gone. Cluster flies, which winter in attics and walls up north, need sealing before fall.

Below you'll find how to tell flies apart, how to clean a drain fly drain, when to call for help and what fly work usually costs.

Fly near an outdoor bin lid

What kind of fly problem are you seeing?

Flies at sunny windows

Big, slow flies gathering at windows in fall or on warm winter days are usually cluster flies coming out of the walls.

Tiny fuzzy flies by the sink

Moth-like flies near drains are drain flies. Tape over the drain overnight; flies stuck to it confirm the source.

A sudden swarm and a smell

Shiny green or blue flies plus a bad smell usually mean a dead mouse or bird nearby.

What should you ask before booking?

Ask what the visit includes, how much it costs, and whether a follow-up is included. It’s also helpful to know what you’ll need to do before treatment and when you can use the area again.

Have children or pets at home? Mention them when discussing treatment. For a business, let the company know your opening hours so you can talk about a convenient time to visit.

How fly activity changes through the year

  • Spring: Flies return as the weather warms. A good time to check screens and door sweeps.
  • Summer: Peak season. Heat speeds up the life cycle, so empty and rinse trash bins often.
  • Fall: Cluster flies look for a way into walls and attics in the North. Seal gaps early.
  • Winter: Cluster flies can appear at windows on warm days. Elsewhere it's the quiet season.

Keep exploring your options

  • House Fly Source Control — Learn how waste, pet areas, compost, entry points, and other breeding conditions are checked before treatment options are considered.
  • Commercial Fly Management — Compare monitoring, sanitation, exclusion, and treatment approaches for restaurants, food facilities, warehouses, and other commercial properties.
  • Exclusion & Proofing — Review screens, air curtains, door sweeps, sealing, and operating practices that can reduce fly entry.
  • Insect Light Trap Planning — Understand appropriate placement, monitoring, maintenance, and food-area limitations before selecting an insect light trap system.
  • Contact and quote request — ask a question or request a quote.

Common questions about fly control

Why do I keep getting flies?

There's usually a source nearby: a trash bin, a drain, compost or a dead animal. Find it and the flies stop.

How do I get rid of drain flies?

Scrub the drain with a stiff brush, then use an enzyme cleaner every night for a week. Bleach alone won't clear the slime.

What are the big flies at my windows?

Usually cluster flies that spent the winter in the walls. Vacuum them up and seal gaps before next fall.

Does a swarm of flies mean something died?

Often. Big, shiny flies and a bad smell usually point to a dead mouse or bird.

Are bug bombs worth it?

No. They don't reach the source, and the flies come back.

What does fly control cost?

Most home jobs cost $100–$450. Cluster flies and businesses can cost more.

Ready to ask about your fly problem?

Tell us what you’ve noticed and ask about an inspection or a quote. You decide whether to book after speaking with a company.