Housefly Lifecycle: Egg to Adult in About a Week

Understanding how fast houseflies develop shows why a small problem quickly becomes a big one.

The short answer

In warm conditions, houseflies can go from egg to adult in roughly a week to ten days. Females lay batches of eggs on rotting organic matter, maggots feed for a few days, pupate in a case and emerge as adults that breed again quickly. Because of this speed, remove waste often, keep bins and drains clean and act on early signs. Control works best by removing breeding material.

Stages

1. Eggs laid on rotting matter.
2. Larvae (maggots) feed and grow.
3. Pupae form in a case.
4. Adults emerge and breed within days.

Control implications

• Clean waste before eggs develop.
• Check bins, drains and corners.
• Act early.

Timeline varies

• Faster in warm, humid weather.
• Slower in cool conditions.

When to call a professional

If the problem is widespread, keeps returning or you are unsure what you are dealing with, a professional inspection will save time and avoid wasted effort.

Frequently asked questions

How long do flies live?

Weeks.

Where do they lay eggs?

Rotting waste and manure.

Do maggots mean a source?

Yes.

Can one fly become many?

Yes, quickly.

This guide is part of IPest's complete resource on fly control. For identification help, prevention and treatment options, see our full fly control guide for Bangalore.