Woodworm treatment for a mill conversion in Harrogate


Client: Newby

Products used: Fungicidal Spray

Set in the north side of the River Nidd, Glasshouses Mill, a former flax mill, was an abandoned Grade II listed building. Situated within a short drive from Pateley Bridge and Harrogate, Glasshouses Mill is surrounded by picturesque woodland walks, waterscapes and breath-taking views.

Many of Yorkshire’s mills survive today, the mill is of particular historical significance as is a physical reminder of Yorkshire’s industrial heritage. As with many mills throughout the region, it had fallen into a state of disrepair.

With an established presence in the region and decades of experience in the treatment of timber, Timberwise were called out to inspect the empty property for suspected woodworm before the mill was to be transformed into contemporary apartments, cottages and family homes.

Woodworm thrives in extremely damp conditions, especially where there is timber decay. Abandoned for some time and exposed to the elements Glasshouses Mill made for the perfect home. An active infestation of common furniture beetle was discovered by our timber specialist in all timbers on the ground, first and second floor as well as the roof timbers. Woodworm is the widely used generic term for wood boring insects. These insects attack wood and can cause structural damage.

Did you know?

In 1899 the building was converted to hemp spinning and rope making, it is the local understanding that the mill made rope for the infamous RMS Titanic.


Timberwise carried out a full insecticidal spray treatment to the ground floor, first floor and second floor, killing the eggs, larvae and adult beetles in all exposed timbers. As the property was undergoing full refurbishment all external defects were already rectified prior to Timberwise’s arrival such as the roof detail, gutters and rainwater goods.

All painted timbers were sandblasted prior to treatment, all floor coverings were removed to allow access to the floorboards and ceilings were removed to allow treatment to the joists. Luckily for the client, there was no severe damage which meant no timber had to be cut away or removed.

The treatment to the timbers will prevent the development of any further eggs and with the final emergence of beetles, the treatment becomes completely effective therefore, the infestation will eventually die out. Spraying timbers affected with woodworm is the most frequent treatment used to treat woodworm. The spray treatments used by Timberwise utilises water-based treatments which are designed to reduce risks to individuals and the environment.

 Timberwise provide woodworm treatments to commercial properties of any age and size and with an established presence within the area, our customer knew by using Timberwise they would automatically benefit from the high-quality service and value associated with the past five decades of work ”

Nic Glover, Timberwise CSRT Surveyor


The client was then left with a “blank canvas” free from woodworm, ready to continue on the re-development of the property and surrounding areas into apartments and townhouses. All Timberwise works were carried out on a weekend to minimise site disruption throughout the week. With the Timberwise long term 20-year timber guarantee covering the work the client, as well as their customers, will have complete peace of mind that the property is cared for long after the development is complete.

The full site was split into 2 phases; Phase 1 is the redevelopment of the existing listed Mill into 9 river fronting apartments, 10 houses and 13 substantial townhouses, works have commenced and were completed in 2018.  Phase 2 will create further residential dwellings and is due for completion in June 2020.

Contact The Experts To Eradicate Your Woodworm Problem

Please free to request a survey online where our property care team will be happy to talk through your issue and arrange a convenient time to visit. You can also alternatively contact us by calling 0800 288 8660.