Four steps, and the order is not negotiable. Get it wrong and you seal live rats inside your walls — which is the single most common and most expensive DIY mistake.
Confirm it is rats, remove what is feeding them, treat the active problem, then close the way in. In that order.
Professional treatment is £190 for a flat and £240 for a house, with proofing separately at £180. Doing step four before step three is how people end up with rats gnawing their way out through plasterboard.
Skipped constantly, and the response differs by animal. Mice, squirrels and even birds produce evidence that gets attributed to rats.
| Rat | Mouse | Squirrel | |
|---|---|---|---|
| Droppings | Dark, tapered, ~15mm | Small dark specks | Larger, rounded |
| Noise | Moderate, often dragging | Light, fast skittering | Heavy thumping |
| When | After dark | After dark | Daytime |
| Where | Walls, floors, lofts, drains | Walls, ceilings, kitchens | Roof space only |
| Treatment | £190 / £240 | £190 / £240 | £280 trapping |
The quickest discriminator is dropping size. Rat droppings are unmistakably larger than mouse droppings — comparable to a large grain of rice or bigger, and tapered at the ends.
Read nextSigns of Rats in a Harrow Property – What Should You Look For? →Rats need food, water and shelter. Removing those does not clear an established problem on its own, but it makes everything that follows work better and occasionally resolves a marginal one:
Two reasons, and neither is about effort.
Neophobia. Rats are genuinely wary of new objects in a familiar environment — considerably more so than mice. A trap placed today may be avoided for days regardless of what is on it, which is why people conclude the trap 'does not work' and give up just before it would have.
Product strength. Amateur rodenticides are deliberately weaker than professional ones, and there are real restrictions on how and where they may be used. Careless placement is a hazard to pets, children and wildlife — and secondary poisoning of owls, foxes and cats is a genuine consequence of poison left in the open.
See our complete service, published prices and treatment information.
View Rat Control Harrow →Once the active problem is dealt with, the question becomes how they got in — because if nothing changes, the route stays open for the next one.
Rats pass through surprisingly small gaps and will gnaw a small opening into a usable one. The usual routes:
Proofing is £180 for up to one hour on suitable small holes. Where the cause is structural — a collapsed drain, a hole needing bricklaying — that is building work, and we will tell you so rather than papering over it.
Read nextRat Proofing Harrow – How Much Does It Cost? →Sealing a building that still has rats inside does not remove them. It traps them, and a rat that cannot get out gnaws at whatever stands between it and the outside — cabling, pipework, plasterboard. Then it dies somewhere you cannot reach.
Treat first, proof second. Every time. It costs slightly more in the short term and saves a great deal in the long term.
Professional treatment is available throughout Harrow and every surrounding area, at the same published prices. Properties backing onto railway lines, waterways, allotments or areas of scrub see more passing traffic than others, and gardens with bird feeders see more than gardens without.
It depends on how established the problem is and how much of step two you have done. It is not an overnight job, and anyone promising you that it is should be treated with suspicion.
If the food source and the access route are both still there, something eventually will. That is what step four is for.
Not generally. Tell us about pets and small children when you book, because it genuinely affects how and where things are placed.
A different problem with an equally clear price — wasp nest treatment across Harrow is £90 fixed cost, guaranteed.
Confirm the pest, remove the food and shelter supporting it, treat the active problem, then close the access route. Leaving any of those undone causes a repeat.
£190 for a flat and £240 for a house.
No. Proof after treatment, never before — sealing rats inside a building makes things considerably worse.
Rats are wary of new objects in a familiar environment, so traps are often avoided for days. Most people give up before that wariness passes.
Their use by non-professionals is restricted in England, and we would not recommend them in any case.
There is no reliable evidence that either resolves an established rat problem.
They are one of the most common contributors in a domestic garden. Spilled seed is a reliable food source.
If you have seen a rat indoors, found gnawed cabling, heard noises inside the structure, or two weeks of effort has changed nothing.
Published prices, and honest advice about whether you need proofing as well as treatment.
Prefer to talk? Call 0203 151 6640 or WhatsApp us.
