| Materials | Price inc VAT | Lead Time |
|---|---|---|
| Oak | 3630 £ | |
| Douglas fir | 3450 £ | |
| Treated spruce | 3300 £ |
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One of the biggest advantages of using oak for outdoor structures is its low maintenance requirements. Homeowners often ask whether oak needs treating to protect it from the elements—especially in the UK climate.
Oak does not require chemical treatment.
Thanks to its natural tannins and dense grain, oak is highly resistant to rot, fungal decay, and insect attack. This makes it an excellent choice for outdoor structures such as pergolas, lean-tos, and garden frames. Over time, untreated oak will naturally weather to a silver-grey finish. This process is purely cosmetic and does not affect the strength or lifespan of the timber.
When exposed to the elements, oak:
These characteristics are completely normal and are often valued for the traditional, rustic appearance they create.
Yes—while oak does not need treating, location can influence how often it should be checked or cleaned.
Using stainless steel or galvanised fixings ensures long-term performance in harsher environments.
Although no treatment is required, light maintenance can help keep oak looking its best:
Structurally, oak performs exceptionally well even when left completely untreated.
So, Does Oak Need Treating or Maintenance? No chemical treatment is necessary. Oak is designed by nature to withstand the outdoors. With minimal care—usually just occasional cleaning—oak structures can last for decades while developing a beautiful natural patina. In my experience, untreated oak not only lasts longer than many treated timbers, but it also ages far more gracefully.
| Stronghold Pergola Supplied – Included | ||
| Uprights | mm | 145 x 145 |
| Top Plates | mm | 145 x From 145 |
| Joists | mm | 70 x 145 |
| End Beam Cut | Type | A1 – 20 |
| Brace B1 | mm | 50 x 150 |
| Kiln Dried Oak Dowels | mm | Diameter 16 |
| Extras | ||
| Brace B2 – 9 | Extra | |
| Staddle Stones – Flat or Taper | Extra | |
| Concealed Post Base – CPT66Z | Extra | |
| Custom Wall Systems D1-14 | Extra | |
| Chamfers for Beams Larger than 165 mm | Free | |
| Fixings ( screws, nails, etc ) | Extra | |
| Delivery | Extra | |
| Tailor The Frame To Be Up To 225 mm Thick | ||
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We will prepare a price offer and get back to you with an offer and 3D renders for free of charge.
If you have your own sketches, architectural drawings or photos from the internet, please attach below, it will help us with design and pricing.


















