{"product_id":"leviathan-wooden-pergola-2-5m-x-2-5m-120mm-posts-smart-seal-treated-nationwide-installation-included-copy","title":"Leviathan Wooden Pergola 3m x 3m | 120mm Posts | Smart Seal Treated | Nationwide Installation Included","description":"\u003ch2\u003eLeviathan Wooden Pergola – 3m x 3m | 120mm Posts | Smart Seal Timber Treatment\u003c\/h2\u003e\n\u003cp\u003eWhen you want a pergola that truly owns the garden, the \u003cstrong\u003eLeviathan Wooden Pergola 3m x 3m\u003c\/strong\u003e by \u003cstrong\u003eDunster House\u003c\/strong\u003e delivers. With a generous 3m x 3m footprint, \u003cstrong\u003eimposing 120mm x 120mm upright posts\u003c\/strong\u003e, and a bold open-rafter design, this is a structure that commands the space around it — creating a substantial, defined outdoor room that invites you to live outside.\u003c\/p\u003e\n\u003cp\u003eImagine a long summer evening: a full dining set beneath the rafters, fairy lights threaded through the beams, the scent of jasmine climbing the posts. The Leviathan 3m x 3m gives you the room to do it properly — to entertain, to relax, to make your garden the place everyone wants to be. With enough internal space for a generous seating arrangement, an outdoor kitchen setup, or even a hot tub, this pergola is as versatile as it is impressive.\u003c\/p\u003e\n\u003cp\u003eBuilt by \u003cstrong\u003eDunster House\u003c\/strong\u003e from \u003cstrong\u003eslow-grown, pressure treated spruce\u003c\/strong\u003e — not cheap pine — every component is denser, stronger, and engineered to perform through the British seasons year after year. All timber is \u003cstrong\u003efully pressure treated\u003c\/strong\u003e (not merely dip treated) and finished with \u003cstrong\u003eSmart Seal timber sealant as standard\u003c\/strong\u003e, providing a superior barrier against moisture and UV damage. Backed by a \u003cstrong\u003e10-year guarantee against rot and insect infestation\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003e🌟 \u003cstrong\u003eProfessional nationwide installation and Smart Seal timber treatment are both included in the price, free of charge.\u003c\/strong\u003e Our experienced fitting teams cover the whole of Mainland UK — we handle everything from delivery to final fitting so you can simply step outside and enjoy.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eGenerous 3m x 3m footprint\u003c\/strong\u003e — ample space for dining, entertaining, or a hot tub\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eImposing 120mm x 120mm upright posts\u003c\/strong\u003e — premium structural strength and visual impact\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eSlow-grown spruce, not cheap pine\u003c\/strong\u003e — denser grain, superior long-term durability\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eFully pressure treated\u003c\/strong\u003e (not dip treated) — long-term rot and insect resistance\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eSmart Seal timber treatment included as standard\u003c\/strong\u003e — superior moisture and UV protection\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003e10-year guarantee\u003c\/strong\u003e against rot and insect infestation\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003ePre-notched, pre-cut, planed rafters\u003c\/strong\u003e — precision engineered for a clean, professional finish\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eAll fixings included\u003c\/strong\u003e — no hidden extras\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003ePerfect for climbing plants\u003c\/strong\u003e — posts and rafters ideal for roses, wisteria, jasmine, and more\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eNationwide installation included as standard\u003c\/strong\u003e — anywhere across Mainland UK, free of charge\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall External Dimensions:\u003c\/strong\u003e 3.321m x 3.321m (10' 10.75\" x 10' 10.75\")\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eExternal Width:\u003c\/strong\u003e 3.040m (9' 11.75\")\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eExternal Depth:\u003c\/strong\u003e 3.040m (9' 11.75\")\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInternal Width:\u003c\/strong\u003e 2.724m (8' 11.25\")\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInternal Depth:\u003c\/strong\u003e 2.724m (8' 11.25\")\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Height:\u003c\/strong\u003e 2.350m (7' 8.25\")\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInternal Eaves Height:\u003c\/strong\u003e 2.260m (7' 5\")\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUpright Posts:\u003c\/strong\u003e 120mm x 120mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTimber:\u003c\/strong\u003e Slow Grown Spruce (Fully Pressure Treated)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTimber Finish:\u003c\/strong\u003e Smart Seal (included as standard)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGuarantee:\u003c\/strong\u003e 10 Years against Rot and Insect Infestation\u003c\/li\u003e\n  \u003cli\u003e\u003cem\u003eAll sizes quoted are nominal. All fixings supplied. Rafters are pre-cut, pre-notched, and planed.\u003c\/em\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhy Choose Bespoke Oak and Slate?\u003c\/h3\u003e\n\u003cp\u003eAt Bespoke Oak and Slate, we supply and install premium \u003cstrong\u003eDunster House\u003c\/strong\u003e garden structures across the UK. Every Leviathan order includes \u003cstrong\u003eprofessional installation and Smart Seal timber treatment as standard — completely free of charge\u003c\/strong\u003e. No hidden costs, no surprises — just a beautifully installed, fully sealed pergola ready for you to enjoy.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\n\u003ch4\u003eDoes the price include installation?\u003c\/h4\u003e\n\u003cp\u003eYes — \u003cstrong\u003eprofessional nationwide installation is included in the price, free of charge\u003c\/strong\u003e. Our experienced fitting teams cover the whole of Mainland UK. The price you see is the price you pay — fully installed, no extras.\u003c\/p\u003e\n\n\u003ch4\u003eWhat is Smart Seal and is it included?\u003c\/h4\u003e\n\u003cp\u003e\u003cstrong\u003eSmart Seal is a premium timber sealant\u003c\/strong\u003e that provides a superior protective barrier against moisture penetration, UV damage, and weathering — going beyond standard pressure treatment to keep your pergola looking and performing at its best for longer. \u003cstrong\u003eSmart Seal is applied as standard with every order\u003c\/strong\u003e, free of charge, by our installation team as part of the fitting process.\u003c\/p\u003e\n\n\u003ch4\u003eDo you install anywhere in the UK?\u003c\/h4\u003e\n\u003cp\u003eYes. We install \u003cstrong\u003eanywhere across Mainland UK\u003c\/strong\u003e at no extra cost. Whether you’re in the South West, the Midlands, Scotland, or anywhere in between — our teams will come to you.\u003c\/p\u003e\n\n\u003ch4\u003eHow much space does the 3m x 3m Leviathan provide?\u003c\/h4\u003e\n\u003cp\u003eThe Leviathan 3m x 3m offers an \u003cstrong\u003einternal space of 2.724m x 2.724m\u003c\/strong\u003e — comfortably accommodating a 6-seater outdoor dining set, a large corner sofa, or a hot tub with surrounding decking. It’s a genuinely usable outdoor room, not just a decorative feature.\u003c\/p\u003e\n\n\u003ch4\u003eHow does the 3m x 3m differ from the 2.5m x 2.5m Leviathan?\u003c\/h4\u003e\n\u003cp\u003eThe \u003cstrong\u003e3m x 3m version\u003c\/strong\u003e offers significantly more internal space — an internal footprint of 2.724m x 2.724m versus 1.83m x 1.83m on the 2.5m model. This makes it the better choice for those who want to use the pergola for dining, entertaining, or housing a hot tub. Both versions share the same 120mm posts, pressure treated spruce, and Smart Seal finish.\u003c\/p\u003e\n\n\u003ch4\u003eWhat makes the Leviathan different from cheaper pergolas?\u003c\/h4\u003e\n\u003cp\u003eThe Leviathan is a \u003cstrong\u003eDunster House\u003c\/strong\u003e product built from \u003cstrong\u003eslow-grown spruce, not cheap pine\u003c\/strong\u003e. Slow-grown timber has a denser grain structure, making it significantly stronger and more durable. Combined with \u003cstrong\u003efull pressure treatment, Smart Seal finishing, 120mm x 120mm posts\u003c\/strong\u003e, and precision pre-notched rafters, the Leviathan is in a different class to budget pergolas.\u003c\/p\u003e\n\n\u003ch4\u003eWhat is the difference between pressure treated and dip treated timber?\u003c\/h4\u003e\n\u003cp\u003e\u003cstrong\u003ePressure treatment\u003c\/strong\u003e forces preservative deep into the timber fibres under pressure, providing long-lasting protection from the inside out. \u003cstrong\u003eDip treatment\u003c\/strong\u003e only coats the surface and offers far less protection over time. The Leviathan uses full pressure treatment plus \u003cstrong\u003eSmart Seal\u003c\/strong\u003e as an additional protective layer — which is why it comes with a \u003cstrong\u003e10-year guarantee against rot and insect infestation\u003c\/strong\u003e.\u003c\/p\u003e\n\n\u003ch4\u003eCan I grow climbing plants on this pergola?\u003c\/h4\u003e\n\u003cp\u003eYes — the Leviathan’s \u003cstrong\u003e120mm x 120mm posts\u003c\/strong\u003e and open rafter design are ideal for climbing plants such as roses, jasmine, clematis, wisteria, and ivy. The larger 3m x 3m frame gives climbing plants even more structure to work with, creating a spectacular natural canopy over time.\u003c\/p\u003e\n\n\u003ch4\u003eDoes this pergola need planning permission?\u003c\/h4\u003e\n\u003cp\u003eIn most cases, a pergola of this size falls within \u003cstrong\u003epermitted development rights\u003c\/strong\u003e and does not require planning permission, provided it meets standard conditions (e.g. not covering more than 50% of garden area, not positioned forward of the principal elevation). We always recommend checking with your local planning authority if you are unsure.\u003c\/p\u003e\n\n\u003ch4\u003eWhat are the exact dimensions?\u003c\/h4\u003e\n\u003cp\u003eThe overall external footprint is \u003cstrong\u003e3.321m x 3.321m\u003c\/strong\u003e (10' 10.75\" x 10' 10.75\"), with an internal space of 2.724m x 2.724m. The overall height is 2.350m (7' 8.25\") with an internal eaves height of 2.260m (7' 5\"). All sizes are nominal.\u003c\/p\u003e\n\n\u003ch4\u003eAre all fixings included?\u003c\/h4\u003e\n\u003cp\u003eYes — \u003cstrong\u003eall fixings needed for assembly are included\u003c\/strong\u003e at no extra cost. As installation is included as standard, our professional team handles the entire build for you.\u003c\/p\u003e\n\n\u003ch4\u003eWhat is the guarantee?\u003c\/h4\u003e\n\u003cp\u003eThe Leviathan Wooden Pergola 3m x 3m comes with a \u003cstrong\u003e10-year guarantee against rot and insect infestation\u003c\/strong\u003e on the pressure treated timber, provided the care instructions supplied by Dunster House are followed.\u003c\/p\u003e","brand":"Dunster House","offers":[{"title":"Default Title","offer_id":61599523406154,"sku":null,"price":2550.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1026\/5572\/1802\/files\/Leviathan-pergola-3x3-day-1.webp?v=1776106557","url":"https:\/\/www.bespokeoakandslate.com\/products\/leviathan-wooden-pergola-2-5m-x-2-5m-120mm-posts-smart-seal-treated-nationwide-installation-included-copy","provider":"Bespoke Oak and Slate","version":"1.0","type":"link"}