Yes — That can be quiet normal, you should get a huge reduction in pests straight away. Seeing pests in the days or even weeks after a professional treatment doesn’t mean the job has failed. In most cases, it’s actually a sign that the treatment is working exactly as it should.

At Bug Free Pest Control, our licensed technicians treat thousands of Sydney homes and businesses every year. One of the questions we hear most often is: “I still see bugs — did it work?” This guide explains why that happens, what to expect for each common pest, and exactly when to call us back under our 6-month warranty.

Why You Might See More Pests Immediately After Treatment

When a pesticide is applied, it disrupts pest habitats and drives them out of the walls, cavities, and nesting areas where they’ve been hiding. This means you may notice a temporary increase in visible pest activity within the first 1–2 weeks, particularly with cockroaches and ants.

This is normal. It does not mean the treatment failed.

Many of the professional-grade products we use are non-repellent, meaning pests can’t detect the treated zones and continue to move through them picking up the chemical and carrying it back to the nest or colony. This transfer effect is what makes professional treatments far more effective than over-the-counter sprays, which only kill on contact and leave the source untouched.

How Long Does It Take for Pest Control to Work? (By Pest)

Treatment timelines vary by pest type. Here’s what you can realistically expect:

• Pest | Expected Timeline | What You Might See Initially
• Cockroaches | 4–6 weeks | Increased activity as the gel is transferred through the colony
• Ants | 2–4 weeks | More ants visible as they’re flushed from nesting sites
• Spiders | 1–2 weeks | Some activity in untreated areas initially
• Fleas | 4–6 weeks | Bites may continue briefly as eggs hatch post-treatment
• Silverfish | 2–4 weeks | Occasional sightings as the residual product works
• Rodents | 1–3 weeks | Rodents may remain hidden; traps need time to take effect
• Bed Bugs | 4–6 weeks | Up to 50% reduction in week one; full eradication takes longer
• Wasps | 24–72 hours | Wasp nests usually eliminated quickly; avoid the area briefly

Understanding How Cockroach Gel Treatment Works

Cockroaches are among the pests most likely to remain visible after treatment and the most commonly misunderstood.

Our technicians apply a professional-grade cockroach gel bait to key harbourage areas inside the property. Unlike spray treatments that kill on contact, the gel works through a transfer mechanism:

1. A cockroach encounters the bait and feeds on it.
2. It returns to the colony before the active ingredient takes effect.
3. Other cockroaches in the nest are exposed through contact and by feeding on affected cockroaches.
4. The entire colony is eliminated from the inside out.

This process takes time, typically 4 to 6 weeks for a full colony to be eradicated. During this period, it is completely normal to see cockroaches moving around, particularly at night. This is a sign the treatment is working, not that it isn’t.

Do not use over-the-counter sprays during this period. Repellent sprays can disrupt the bait’s transfer mechanism and significantly reduce the effectiveness of our treatment.

Bug Free’s 6-Month Warranty. What It Covers?

Our general pest control services come with a 6-month warranty, backed by our 4.9-star rating from over 5,000 Sydney customers.

Here’s how the warranty works:

• 6 weeks: Give the treatment time to fully take effect. Most infestations will be resolved within this window.
• Still seeing active pests after 6 weeks? Call us. We will send a licensed technician back to your property at no additional cost.
• 6-month coverage: If pests remain a problem within 6 months of your treatment, we will re-treat under warranty.

Our warranty applies to general pest treatments covering cockroaches, ants, silverfish, spiders, and other common household pests. Specific terms may vary for termite treatments, rodent control, and bed bug treatments, ask your technician for details at the time of service.

What You Should (and Shouldn’t) Do After a Treatment

• Allow the treatment to dry fully before re-entering treated areas (your technician will advise the exact timeframe)
• Ventilate the property by opening windows to help treatments dry and reduce chemical odour
• Avoid mopping or wiping down treated surfaces for at least 2 weeks, as cleaning removes the residual product
• Monitor pest activity and keep notes on where and when you’re seeing pests. This helps our technicians if a follow-up is needed
• Keep food stored in sealed containers and eliminate standing water to remove pest attractants

Avoid These Mistakes

• DO NOT use DIY cockroach sprays or aerosols after a professional gel bait treatment, repellent chemicals interfere with the bait
• DO NOT vacuum treated floor areas for at least 2 weeks
• DO NOT mop treated surfaces with strong detergents
• DO NOT assume the treatment has failed if you see pests within the first 2–4 weeks

When Should You Actually Be Concerned?

While seeing pests in the first few weeks is normal, there are specific situations where you should contact Bug Free sooner rather than later:

• You are seeing the same volume or more pests after 6 weeks with no reduction at all
• You notice new entry points, damage, or nesting activity that wasn’t present before
• You are seeing pest activity in areas that were not part of the original treatment
• You suspect a re-infestation from an external source (neighbouring property, new building materials, etc.)

In any of these cases, call us on 1300 855 548 or book a follow-up online. If you are within your warranty period, the re-treatment is on us.

Related Frequently Asked Questions

How long after pest control will I stop seeing cockroaches?

In most cases, cockroach activity will reduce significantly within 2–3 weeks and should be fully resolved by 6 weeks. If you are still seeing active cockroaches after 6 weeks, contact Bug Free to arrange a free warranty re-treatment.

Is it normal to see more bugs after pest control?

Yes. A temporary spike in visible pest activity in the first 1–2 weeks is common and expected. Pests are being flushed from their hiding places and are coming into contact with the residual treatment. Activity should steadily decline from week 2 onwards.

Should I clean after a pest control treatment?

Avoid mopping or wiping down treated surfaces for at least two weeks. You can do light cleaning in untreated areas, but scrubbing floors and surfaces where products were applied will remove the residual treatment and reduce its effectiveness.

Can I use my own sprays after a professional treatment?

We strongly advise against it, particularly after a cockroach gel bait application. Over-the-counter repellent sprays disrupt the transfer mechanism that makes professional bait treatments effective. If you feel the need for additional treatment, call Bug Free first.

Do I need to leave my home after pest control?

It depends on the products used. Your Bug Free technician will advise you on the specific re-entry time for your treatment. For most general spray treatments, you’ll be asked to stay out for 1–2 hours until surfaces dry. Your technician will always explain this before leaving your property.

What pests are covered under the 6-month warranty?

Our 6-month warranty covers general pest treatments, which include cockroaches, ants, spiders, silverfish, and most common household insects. Termite treatments, rodent control, and bed bug treatments have separate warranty terms. Your technician will confirm these at the time of your service.

Trusted Pest Control Across Sydney

Bug Free Pest Control is 100% Australian run and has been protecting Sydney homes and businesses from pests for years. Our technicians are fully licensed, trained in the latest treatment methods, and committed to providing honest, transparent service every time.

We operate 7 days a week, 365 days a year, from 7am to 8pm, because pests don’t keep business hours, and neither do we.

• 4.9-star Google rating from 5,000+ verified reviews
• 6-month warranty on general pest treatments
• Free re-treatment if pests persist beyond 6 weeks
• Serving all of Sydney, including Parramatta, Blacktown, Penrith, Campbelltown, Liverpool, Auburn, Bankstown, Ryde, and the CBD

Call us on 1300 855 548 or use our 30-second quote tool to book online today.