Near Dollis Brook, the side of the house facing the garden takes most of the traffic. Rats and mice arriving from the bank reach the back wall first, so the gaps along it matter more than anywhere else on the building.
Rodent proofing is £180 for up to one hour of work on small holes, once treatment is done. Book proofing or call 0800 955 2347.
Where a garden runs down to the brook, anything coming off the bank works its way up the garden and meets the house from behind. The street side sees far less of it. That makes the rear wall, the garage and any extension the part to get right. The corridor itself cannot be closed, which is the point Pest Control Whetstone makes, but the building can be. The most common entry points is a useful checklist before you walk round.

Interwar semis and many older cottages have suspended timber floors ventilated by air bricks. A grille with a missing corner, or crumbling mortar round it, opens straight into the void below the floor. It has to stay ventilated, so the answer is a sound grille or a fine mesh cover rather than filling it. Stopping rats at air bricks goes through ways of doing that without cutting off the airflow.

Kitchen and bathroom waste pipes, the outside tap, the gas supply and cables for garden lights or a garden office all pass through the rear wall, and the holes are often cut wider than the pipe. Where a rear extension meets the original house there may also be a gap at ground level. Proofing pipe and cable gaps covers the detail.

A back door that has dropped on its hinges, or a garage door that no longer meets the floor, can leave a gap a mouse simply walks under. In the older cottages, soft mortar at the foot of a wall and gaps round old timber door frames are worth a look as well. Brush strips and small repairs at these points fit within the hour where the door and frame are sound.
The service is up to one hour of work sealing small holes that can be reached. On a Whetstone house backing onto the brook, that might be a damaged air brick, two or three pipe entries and the gap under the back door, depending on how many there are and how easy they are to get at.
Some things sit outside it. A fence along the bank, a mesh skirt round a shed or a new gravel board is garden work, for you or a fencer. Rebuilding weathered brickwork, replacing a rotten frame or repairing an extension joint is for a builder, and a broken drain is for a drainage contractor. If what you have needs one of them, you will be told.
Proofing is booked once the rats or mice have been dealt with. Seal a hole that animals are still using and they may be shut inside a floor void or wall, where they will gnaw a new way out. Book rat control or mouse control first; before or after treatment explains why the order matters.
When you book rodent proofing, say what you had, when treatment finished and where you think they came in. Mention whether the garden backs onto the brook, and list the air bricks, pipes and doors on the garden side you already know about. Move bins, planters and anything stacked against the back wall and garage, and make the cupboard under the sink easy to open. Afterwards you will hear which gaps were sealed and whether anything needs a builder. If gnaw marks or fresh droppings appear by a sealed gap, get in touch, and which holes rodents are actually using helps you tell an old hole from a live one. Proofing across the borough is on Rodent Proofing Barnet.
Rodent proofing for a Whetstone house or flat costs £180 for up to one hour, spent sealing small holes on the garden side and anywhere else rodents have been getting in. It costs the same for a cottage, a semi or a flat; the number of small gaps and how easily they can be reached decide how much is done in the hour. Fencing, brickwork and drain repairs are not part of it.
| Treatment | Price |
|---|---|
| Rodent Proofing | £180 – up to 1 hour, small holes |
It cannot stop them using the brook or crossing the garden. It closes the gaps into your house, which is what keeps them out of the building. Book proofing once treatment has finished.
That is garden work rather than part of the proofing hour. Burying mesh along a fence line or fitting a gravel board is a job for you or a fencer; the hour is spent on the house.
Small gaps at the foot of a wall or round a pipe can often be sealed. Wide areas of weathered pointing need a builder, ideally one used to older brickwork.
Smaller than most people expect. What size hole a mouse can get through and what size gap a rat can get through give the sizes.
Yes, if you know roughly where they came in. Wood mice from the garden tend to use the same routes each autumn, so closing them before the weather turns is well timed.
No. They keep the timber floor ventilated, and blocking them can lead to damp and rot. A damaged one should be repaired or covered in a way that still lets air through.











Tell us whether it was rats or mice, when treatment finished, and which air bricks, pipes or doors on the garden side you think they were using.
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