Woodworm Killer 5L
Rating: 99 / 100

Eradicate woodworm and other wood boring insects today! This high strength, ready-to-use woodworm killer is the easiest way to treat woodworm and protect against re-infestation.

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Availability: >In stock


RRP £15.00 Ex VAT
£10.60 Ex VAT £12.72 Inc VAT

Ready to Use Woodworm Treatment

Permagard Woodworm Killer is a ready-to-use high strength (0.249% insecticide) treatment designed to eradicate active woodworm. It is formulated to kill infestations of wood boring insects through all life stages in furniture, flooring, structural and other timbers. It also protects the wood from future attacks and re-infestation, providing peace of mind.

The product comes ready to use and can be simply applied with a paintbrush or low pressure spray to eradicate and provide lasting protection from woodworm. It is a water-based, virtually odourless and quick drying product.

It's vitally important that you effectively treat any woodworm infestation - watch our video below or read our woodworm treatment guide for all you need to know. 

How Woodworm Killer Works

Permagard Woodworm Killer is based on microemulsion technology. This means it is formulated with nano-particles - the tiny size allows the active ingredients to travel deep into the wood. The highly effective pyrethroid insecticide prevents wood boring insect attack and reinfestation as well as killing any active wood boring insects.

How to use Woodworm Killer

Permagard Woodworm Killer is easy to use. Start by making sure that the timber is clean and free from wood dust, contaminates and surface coatings such as oils, waxes and paints. Then, simply spray, brush or dip apply the woodworm killer on to the target timber for complete woodworm treatment. 

Wood treated with this woodworm Killer can be overpainted, varnished or stained when dry. 

Read our complete guide on How to Treat Woodworm.

Our product is designed for external and internal use. To ensure there is no effect on colour or finish when treating sensitive areas, test on an inconspicuous area.

Permagard's Woodworm treatment is registered for amateur use. Before applying please read the health and safety sheet. This product has been tested and approved as a preventative and curative measure for use against wood boring insects.


Permagard - Providing Solutions. Inspiring Confidence.

Permagard are experts in getting rid of woodworm for good. Browse our full range of woodworm treatmentsor read our guides on how to treat woodworm and how to restore woodworm-infested antique furniture


  • Kills active woodworm
  • Prevents infestation of wood boring insects
  • High strength formulation (0.249% insecticide)
  • Water based (Solvent free)
  • Preventative and Curative
  • Ready to use (no mixing required)
  • Targets all wood boring insects
  • Low odour
Model: TTWK5
Manufacturer: Permagard
Packaging: individually
Size: 5 litre container
Dilution: Ready to use product
Coverage: 3-4m²/ litre 15 - 20m² per 5 litre
BPR Approval: UK-2019-1171-1-0007 (Professional and Non Professional)
Country of Manufacture: United Kingdom

Need more information?

Speak to our technical experts.
0117 982 3282

Good product Good value

Good product Good value

Fantastic price, communication and delivery.

Have used the product before and was totally satisfied with its effectiveness. What has totally impressed me this time is the fact I ordered it at around lunchtime yesterday and it has just been delivered. A delivery service by which all other companies should set their standard.

Good value

Arrived next day, easy to apply with a garden sprayer and alot cheaper than equivalents out there. I can't say how effective it has been as I have only just applied it. The guys in the technical department were a great help.

really easy

really easy to use and not an awful smell unlike others

Easy to use

I used a garden sprayer to spray the woodworm killer over my floor boards, I can't say if it has killed off the woodworm yet but it is very easy to apply - like spraying water - and dries very quickly. More importantly, there's virtually no smell making it easy to use without filling the house with toxic fumes!

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Can I use Wood Worm Killer over painted, varnished or waxed timber?

Unfortunately Wood treatments such as Permagard Wood Worm Killer all need to be applied directly to the timber surface and therefore you would need to strip all coatings back to the bare wood and apply the treatment for the product to be successful. You cannot apply this type of product over paint, waxes and varnishes.