{"product_id":"leviathan-wooden-pergola-3m-x-3m-120mm-posts-smart-seal-treated-nationwide-installation-included-copy","title":"Leviathan Wooden Pergola 5m x 3m | 120mm Posts | Smart Seal Treated | Nationwide Installation Included","description":"\u003ch2\u003eLeviathan Wooden Pergola – 5m x 3m | 120mm Posts | Smart Seal Timber Treatment\u003c\/h2\u003e\n\u003cp\u003eThis is the one that stops people in their tracks. The \u003cstrong\u003eLeviathan Wooden Pergola 5m x 3m\u003c\/strong\u003e by \u003cstrong\u003eDunster House\u003c\/strong\u003e is the flagship of the entire Leviathan freestanding range — a full five metres wide, three metres deep, and built with the same \u003cstrong\u003ecommanding 120mm x 120mm upright posts\u003c\/strong\u003e that define the Leviathan name. When it’s installed in your garden, it doesn’t just add a feature. It becomes the garden.\u003c\/p\u003e\n\u003cp\u003eFive metres is a different proposition entirely. It’s the length of a full outdoor dining table with room to spare at both ends. It’s a hot tub at one end, a bar at the other, and a seating area in between. It’s a covered walkway along the back of the house, a sheltered outdoor kitchen, a garden room without walls. The 5m x 3m Leviathan gives you the canvas — what you create beneath it is entirely up to you.\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 — with every rafter pre-cut, pre-notched, and planed to precision. 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, delivering a superior protective barrier against moisture, UV damage, and the relentless British weather. 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 — handling everything from delivery to final fitting so you can simply step outside and enjoy the most impressive pergola in your neighbourhood.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eFlagship 5m x 3m footprint\u003c\/strong\u003e — the largest Leviathan freestanding pergola, unmatched outdoor living space\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eImposing 120mm x 120mm upright posts\u003c\/strong\u003e — heavyweight structural strength and architectural presence\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\u003eSpectacular for climbing plants\u003c\/strong\u003e — 5m of rafter span creates a breathtaking natural canopy\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\u003eApproximate Size:\u003c\/strong\u003e W5m x D3m (W16'5\" x D10')\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\u003eIs this the largest Leviathan pergola available?\u003c\/h4\u003e\n\u003cp\u003eYes — the \u003cstrong\u003eLeviathan 5m x 3m is the largest freestanding pergola in the Leviathan range\u003c\/strong\u003e. It offers the greatest internal space, the longest span, and the most flexibility for outdoor living, entertaining, and landscaping. If you want the very best, this is it.\u003c\/p\u003e\n\n\u003ch4\u003eWhy choose the 5m x 3m over the 4m x 3m?\u003c\/h4\u003e\n\u003cp\u003eThe extra metre of width makes a transformative difference. The \u003cstrong\u003e5m x 3m\u003c\/strong\u003e allows you to genuinely zone your outdoor space — a dining area, a lounge, and a bar or hot tub, all beneath the same structure. It also works beautifully as a \u003cstrong\u003ecovered walkway or veranda\u003c\/strong\u003e along the rear of a house. If you have the garden space and want the most impressive result, the 5m x 3m is the clear choice.\u003c\/p\u003e\n\n\u003ch4\u003eCan this pergola be used as a covered walkway or veranda?\u003c\/h4\u003e\n\u003cp\u003eYes — the \u003cstrong\u003e5m width\u003c\/strong\u003e makes the Leviathan 5m x 3m particularly well-suited for use as a \u003cstrong\u003ecovered walkway along the back of a house\u003c\/strong\u003e, a veranda-style structure, or a sheltered outdoor corridor connecting different areas of your garden or property.\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\u003eAbsolutely — and the \u003cstrong\u003e5m span\u003c\/strong\u003e makes this the most spectacular pergola in the range for climbing plants. Wisteria, roses, jasmine, clematis, and ivy can spread across the full five metres of rafter, creating a breathtaking living canopy that transforms the entire feel of your garden.\u003c\/p\u003e\n\n\u003ch4\u003eDoes this pergola need planning permission?\u003c\/h4\u003e\n\u003cp\u003eGiven its size, we \u003cstrong\u003estrongly recommend checking with your local planning authority\u003c\/strong\u003e before installation. At 5m x 3m, this structure may exceed permitted development thresholds depending on your garden size and property type. Our team is happy to advise, but formal planning confirmation should come from your local council.\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 5m 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":61599531532618,"sku":null,"price":3200.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1026\/5572\/1802\/files\/leviathan-pergola-5030-Day.webp?v=1776107660","url":"https:\/\/www.bespokeoakandslate.com\/products\/leviathan-wooden-pergola-3m-x-3m-120mm-posts-smart-seal-treated-nationwide-installation-included-copy","provider":"Bespoke Oak and Slate","version":"1.0","type":"link"}