Flies in a New Flat: Hidden Sources Behind Walls and Drains

A new flat with flies can be confusing. The cause is often hidden.

The short answer

Check kitchen and bathroom drains, floor traps, dry traps, leaking pipes, construction debris and waste left behind, garbage chutes and shafts, and nearby waste rooms. Dry traps let drain flies and odours enter, so pour water regularly. Fix leaks and remove debris. If you can't find the source, ask the builder or facility manager and a pest professional.

Check

1. Dry drain traps and floor wastes.
2. Leaks behind walls and cabinets.
3. Leftover construction debris or food waste.
4. Shafts, chutes and garbage rooms nearby.

Fix

• Pour water into traps weekly.
• Repair leaks.
• Clean and ventilate.

Escalate

• Talk to management or the builder.
• Call a professional for hidden sources.

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

Why flies in a new flat?

Hidden sources or common areas.

Is it normal?

Not rare, but fixable.

Who handles it?

Possibly management or the builder.

Are drains the problem?

Often yes.

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.