Family Business since 1990
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Avon Timber Merchants is now closed for the festive holidays until our return on Friday, 2nd January 2026, reopening at 8:00 AM.

 

All orders placed on our website will be processed and delivered as soon as possible after our return in January 2026.

The quoting system remains available to use, however, it will not be monitored during the closure. Requests will be reviewed and processed promptly upon our return.

We would like to take this opportunity to wish all our customers a very Merry Christmas and a Happy New Year. Thank you for your continued support.

Warm regards,
The Website Administration Team

Avon Timber Merchants – Stock Take

Please note that we will be closed on Friday 29th May 2026.
We will be open as normal on Saturday 30th May 2026.

Warm regards,
The Website Administration Team

Thermowood 'D' Type AT4 Cladding (Per Metre)

from £9.90

Huge Discounts Offered for orders over 100m (For example, a 40% discount is added for 100m of 18 x 94mm Cladding). 

Minimum order amount of 20m online (please phone/email us if you require less)

 

**The 'Optional' dropdown box below is for informational purposes only and can be ignored if you wish. This option will not affect the total lineal metres ordered as it serves merely as a request, not a guarantee. This product is sold on a 'per lineal metres basis', however, we will strive to apply your request, where possible.**

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Thermowood ‘D’ is produced by treating softwood in special chamber kilns at high temperatures, no chemicals added. The cellular structure changes during the heat treatment and the resulting Thermowood gains a high resistance to moisture or decay causing fungi and becomes more stable in changing climatic conditions which makes it ideal for external cladding.

Our unprocessed Thermowood ‘D’ arrives in lengths usually between 4.2m – 5.1m, if you have specific length requirements then you may make a request above, however, we must emphasize the fact that we cannot guarantee specific lengths.

Face Cover:
18 x 119mm is 86mm
18 x 144mm is 136mm

All of our Cladding is supplied with a smooth machined finish ready to apply the finishing product of your choice.

Since timber is a natural product, each section may contain a different grain pattern, colour, natural figuring, and some small pin knots.
Additionally, it's important to consider the potential for imperfections such as split or splintered ends. To accommodate these imperfections and ensure you have the necessary length for your project, we advise that you allow for approximately 300mm of extra length beyond the actual usable length. This extra length provides a buffer to trim off any ends that may not meet your quality standards, ensuring that you can work with the highest quality sections of timber for your specific needs.
By accounting for this additional length, you can better manage the inherent variability in timber and achieve a more precise and aesthetically pleasing result in your woodworking projects.

Click on an option below to learn more:

  • Opening Hours:
    Monday – Friday: 8 am – 5 pm ("Working Days")
    Saturday: 8 am – 11:45 am
  • Available for immediate collection:
    MDF Products and stocked items in the 'Merchant Products' category
    Note: If an item is out of stock, we will notify you of availability
  • Not available for collection:
    Doors
  • Lead times for non-stocked items:
    • Approx. 12 working days: Machined Skirting, Architrave, Door Lining Sets, Machined Windowboards (excluding MDF), External Cladding, Wide Planed Hardwood (Requiring joining), Non-stocked Saige brand products and Stair Parts, and Veneered Sheet Materials
    • Approx. 7 working days: Planed Hardwoods (Un-joined piece with Square Edges only) and any MDF Window board that requires bespoke resizing
  • Standard Delivery: Items up to 3 m are automatically calculated at checkout. For longer lengths, please request a quote via [email protected].
  • Delivery Days: Weekdays only (Monday–Friday, "Working Days").
  • Lead times:
    • Approx. 12–15 working days: Skirting, Architrave, Door Lining Sets, Windowboards (excluding MDF), External Cladding, Wide Planed Hardwood (Requiring joining), Stair Parts, Non-stocked Saige brand products, Veneered Sheet Materials
    • Approx. 3–5 working days: MDF Products, stocked items in 'Merchant Products' (including core treated/untreated timbers), Decking, Timber and Concrete Fencing products, Planed Redwood, Pine Cladding, Flooring, Mouldings, Sheet Materials (excluding Veneered), OSMO products
    • Approx. 7 working days: Planed Hardwood (Un-joined piece with Square Edges only) and any MDF Window board that requires bespoke resizing
  • Doors:
    • Shown as “In Stock” based on XL Joinery availability; stock levels are not live and may occasionally change
    • Not held in our yard – delivery only via XL Joinery
    • Typical delivery: 3–5 working days if in stock at XL Joinery
    • If urgent, contact us before ordering to confirm availability
  • For mixed orders, the longest lead time applies. Delivery times exclude weekends and Bank Holidays.
  • Special delivery requests: Quick or Saturday delivery via our courier partner can be requested by emailing [email protected]. If a quote was requested without specifying special delivery, standard lead times will apply.
  • For more information, please refer to our Delivery Policy Page.
Need free advice and help from our experts?
Our experienced staff are here to help. We can
give technical advice and tips for your project!
Email us on [email protected]