{"product_id":"leviathan-diamond-corner-pergola-3m-x-3m-120mm-posts-smart-seal-treated-nationwide-installation-included-dunster-house-copy","title":"Leviathan Slatted Back Diamond Corner Pergola 3m x 3m | 120mm Posts | Smart Seal | Nationwide Installation Included","description":"\u003ch2\u003eLeviathan Slatted Back Diamond Corner Pergola – 3m x 3m | 120mm Posts | Smart Seal\u003c\/h2\u003e\n\u003cp\u003eTake the iconic \u003cstrong\u003eLeviathan Diamond Corner Pergola\u003c\/strong\u003e to the next level with the \u003cstrong\u003eSlatted Back\u003c\/strong\u003e version — featuring \u003cstrong\u003etwo integrated slatted timber panels at the rear\u003c\/strong\u003e as standard. Built by \u003cstrong\u003eDunster House\u003c\/strong\u003e from \u003cstrong\u003eslow-grown, pressure treated spruce\u003c\/strong\u003e with imposing \u003cstrong\u003e120mm x 120mm posts\u003c\/strong\u003e, this is the premium corner pergola for those who want a defined, partially enclosed outdoor room straight out of the box.\u003c\/p\u003e\n\u003cp\u003eThe \u003cstrong\u003eslatted back panels\u003c\/strong\u003e create a natural sense of enclosure and privacy at the rear of the structure, allowing light and airflow to pass through while screening the space from neighbours or boundaries. They also provide a beautiful frame for climbing plants, adding a living, organic element to your garden feature over time.\u003c\/p\u003e\n\u003cp\u003eFinished with \u003cstrong\u003eSmart Seal timber sealant\u003c\/strong\u003e and backed by a \u003cstrong\u003e10-year guarantee against rot and insect infestation\u003c\/strong\u003e, the Leviathan Slatted Back is engineered to perform beautifully through the British seasons for years to come.\u003c\/p\u003e\n\u003cp\u003e🌟 \u003cstrong\u003eThe price includes professional nationwide installation and Smart Seal timber treatment — both included free of charge.\u003c\/strong\u003e Our experienced fitting teams install across the whole of Mainland UK, handling everything from delivery to final fitting.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eTwo slatted timber back panels included as standard\u003c\/strong\u003e — privacy and enclosure from day one\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eImposing 120mm x 120mm upright posts\u003c\/strong\u003e — exceptional structural strength and premium visual impact\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eDistinctive diamond roof design\u003c\/strong\u003e — architectural elegance that elevates any garden\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eFully pressure treated slow-grown spruce\u003c\/strong\u003e — long-term rot and insect resistance\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eSmart Seal timber treatment included free of charge\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\u003eNationwide installation included as standard\u003c\/strong\u003e — anywhere across Mainland UK, free of charge\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eCorner-fitting design\u003c\/strong\u003e — maximises use of garden corners and boundary spaces\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003e7.42m² internal area\u003c\/strong\u003e — generous usable space for dining, entertaining, or relaxing\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003ePre-cut, pre-notched, planed timber\u003c\/strong\u003e — precision engineered for a clean, professional finish\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eAll fixings supplied\u003c\/strong\u003e — everything needed is included\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\u003eInternal Area:\u003c\/strong\u003e 7.42m²\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\u003eSlatted Back Panels:\u003c\/strong\u003e 2 (included as standard)\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)\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. Timber is 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 Dunster House garden structures across the UK. Every Leviathan Slatted Back 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 treated pergola ready for you to enjoy.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\n\u003ch4\u003eWhat are the slatted back panels?\u003c\/h4\u003e\n\u003cp\u003eThe \u003cstrong\u003etwo slatted timber back panels\u003c\/strong\u003e are integrated into the rear of the Leviathan structure as standard on this version. They consist of horizontal timber slats that create a natural screen — providing privacy and a sense of enclosure while still allowing light and airflow through. They also make an excellent support for climbing plants such as roses, jasmine, or clematis.\u003c\/p\u003e\n\n\u003ch4\u003eHow does this differ from the standard Leviathan Diamond Corner Pergola?\u003c\/h4\u003e\n\u003cp\u003eThis version comes with \u003cstrong\u003etwo slatted timber back panels included as standard\u003c\/strong\u003e, giving you immediate rear privacy and enclosure without needing to order additional panels separately. The posts, dimensions, roof design, Smart Seal finish, and all other specifications are identical to the standard Leviathan.\u003c\/p\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. \u003cstrong\u003eSmart Seal application is included free of charge\u003c\/strong\u003e with every order — applied 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. From Cornwall to Caithness, our professional teams will come to you regardless of your location.\u003c\/p\u003e\n\n\u003ch4\u003eCan I add more panels to this pergola?\u003c\/h4\u003e\n\u003cp\u003eYes — additional wall panels (half-height timber, full-height timber, or half-height timber \u0026amp; glass) are available as separate add-ons. \u003cstrong\u003eAll panels must be ordered and fitted at the time of your original installation\u003c\/strong\u003e — our team fits everything in a single visit.\u003c\/p\u003e\n\n\u003ch4\u003eWhy does the Leviathan have 120mm posts?\u003c\/h4\u003e\n\u003cp\u003eThe \u003cstrong\u003e120mm x 120mm upright posts\u003c\/strong\u003e are significantly larger than those on standard pergolas, providing exceptional structural rigidity, a premium heavyweight appearance, and the ability to support wall panels, roofing options, and climbing plants without any flex or movement.\u003c\/p\u003e\n\n\u003ch4\u003eIs the timber pressure treated?\u003c\/h4\u003e\n\u003cp\u003eYes. All timber is \u003cstrong\u003efully pressure treated slow-grown spruce\u003c\/strong\u003e, providing long-term resistance to rot and insect infestation, and finished with \u003cstrong\u003eSmart Seal\u003c\/strong\u003e for additional moisture and UV protection. Backed by a \u003cstrong\u003e10-year guarantee\u003c\/strong\u003e against rot and insect damage.\u003c\/p\u003e\n\n\u003ch4\u003eWhat is the internal usable space?\u003c\/h4\u003e\n\u003cp\u003eThe Leviathan Slatted Back offers a generous \u003cstrong\u003e7.42m² internal area\u003c\/strong\u003e, with an internal width and depth of 2.724m (8' 11.25\") each — plenty of room for outdoor dining furniture, a sofa set, or a hot tub enclosure.\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. We always recommend checking with your local planning authority if you are unsure.\u003c\/p\u003e\n\n\u003ch4\u003eWhat is the guarantee?\u003c\/h4\u003e\n\u003cp\u003eThe Leviathan Slatted Back 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":61599264080202,"sku":null,"price":3600.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1026\/5572\/1802\/files\/Leviathan-Diamond-Corner-Pergola-Slatted-Day.webp?v=1776100580","url":"https:\/\/www.bespokeoakandslate.com\/products\/leviathan-diamond-corner-pergola-3m-x-3m-120mm-posts-smart-seal-treated-nationwide-installation-included-dunster-house-copy","provider":"Bespoke Oak and Slate","version":"1.0","type":"link"}