{"id":920984,"date":"2026-09-29T14:00:00","date_gmt":"2026-09-29T12:00:00","guid":{"rendered":"https:\/\/djya2ldob4.wpdns.site\/?page_id=920984"},"modified":"2026-10-30T10:12:39","modified_gmt":"2026-10-30T09:12:39","slug":"os21","status":"publish","type":"page","link":"https:\/\/www.cqop.com\/en\/list-of-soa-categories\/specialised-works\/os21\/","title":{"rendered":"SOA category OS21"},"content":{"rendered":"\n\n<div class=\"cqop-v6 cqop-v6-soa-categoria-os21\" data-v6-page=\"Categoria-OS21\">\n\n<div class=\"cqop-v6-pannello-829311a\" id=\"contenuto\">\n\n<div class=\"gb-text cqop-v6-pannello-fd08351\" aria-hidden=\"true\"><\/div>\n\n\n\n\n\n<div class=\"gb-text cqop-v6-pannello-d3705ba\" aria-hidden=\"true\"><\/div>\n\n\n\n\n\n<div class=\"cqop-v6-contenuto-06a0e85\"><nav style=\"--separator: &quot;\/&quot;\" class=\"cqop-breadcrumbs wp-block-breadcrumbs\" aria-label=\"Breadcrumbs\"><ol><li><a href=\"https:\/\/www.cqop.com\/en\/\">Home<\/a><\/li><li><a href=\"https:\/\/www.cqop.com\/en\/list-of-soa-categories\/\">List of SOA categories<\/a><\/li><li><a href=\"https:\/\/www.cqop.com\/en\/list-of-soa-categories\/specialised-works\/\">SOA specialised works categories<\/a><\/li><li><span aria-current=\"page\">SOA category OS21<\/span><\/li><\/ol><\/nav>\n\n\n\n<div class=\"cqop-v6-pannello-f3875ab\">\n\n<span class=\"gb-text cqop-v6-pannello-4855609\">OS21<\/span>\n\n\n\n\n\n<span class=\"gb-text cqop-v6-pannello-ea96d22\">Specialised works categories<\/span>\n\n<\/div>\n\n\n\n\n\n<h1 class=\"gb-text cqop-v6-titolo-b35a3b5\">SOA category <span class=\"cqop-v6-pannello-8a3115e\">OS21<span aria-hidden=\"true\" class=\"cqop-v6-pannello-f4fc0bb\"><\/span><\/span><\/h1>\n\n\n\n\n\n<p class=\"gb-text cqop-v6-testo-7496375\">Special structural works<\/p>\n\n\n\n\n<div class=\"gb-text cqop-category-requirements\">Requirement: Permanent staff with a licence to operate complex machinery<\/div>\n<\/div>\n\n<\/div>\n\n\n\n\n\n<div class=\"cqop-v6-pannello-13e79de\">\n\n<div class=\"cqop-v6-griglia-642d0e4\">\n\n<div>\n<p class=\"gb-text cqop-v6-testo-43af25e\"><strong class=\"cqop-v6-pannello-7f02261\">OS21<\/strong> relates to <strong class=\"cqop-v6-pannello-7f02261\">specialised structural works<\/strong>: interventions that transfer loads onto soils with low bearing capacity, stabilise the ground, prevent landslides and retrofit existing structures to make them earthquake-resistant. It is one of the most technically demanding categories within the SOA system. It entails one key requirement: the workforce must include operators holding a <strong class=\"cqop-v6-pannello-7f02261\">licence for complex machinery<\/strong> (drilling rigs), issued by construction training colleges. It is strategic for the <strong class=\"cqop-v6-pannello-7f02261\">seismic bonus scheme<\/strong>, <strong class=\"cqop-v6-pannello-7f02261\">hydrogeological instability<\/strong> and the <strong class=\"cqop-v6-pannello-7f02261\">foundations<\/strong> of structures.<\/p>\n<\/div>\n\n\n\n\n\n<div class=\"cqop-v6-pannello-136555f\">\n\n<div class=\"cqop-v6-pannello-be753d0\">\n\n<svg focusable=\"false\" role=\"presentation\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 201 201\" width=\"201\" height=\"201\" aria-hidden=\"true\" class=\"cqop-os-original-icon\" style=\"display:block;width:120px;height:120px;max-width:none;margin:0 0 28px;\"><path fill=\"#fff\" d=\"M22.9 41.9h2.2v2.2h-2.2zM27.37 41.9h2.2v2.2h-2.2zM31.84 41.9h2.2v2.2h-2.2zM36.31 41.9h2.2v2.2h-2.2zM40.78 41.9h2.2v2.2h-2.2zM45.25 41.9h2.2v2.2h-2.2zM49.72 41.9h2.2v2.2h-2.2zM54.19 41.9h2.2v2.2h-2.2zM58.66 41.9h2.2v2.2h-2.2zM63.14 41.9h2.2v2.2h-2.2zM67.61 41.9h2.2v2.2h-2.2zM72.08 41.9h2.2v2.2h-2.2zM76.55 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107.9h2.2v2.2h-2.2zM106.9 107.9h2.2v2.2h-2.2zM86.9 129.9h2.2v2.2h-2.2zM91.9 129.9h2.2v2.2h-2.2zM96.9 129.9h2.2v2.2h-2.2zM101.9 129.9h2.2v2.2h-2.2zM106.9 129.9h2.2v2.2h-2.2zM131.9 64.9h2.2v2.2h-2.2zM131.9 69.3h2.2v2.2h-2.2zM131.9 73.7h2.2v2.2h-2.2zM131.9 78.1h2.2v2.2h-2.2zM131.9 82.5h2.2v2.2h-2.2zM131.9 86.9h2.2v2.2h-2.2zM131.9 91.3h2.2v2.2h-2.2zM131.9 95.7h2.2v2.2h-2.2zM131.9 100.1h2.2v2.2h-2.2zM131.9 104.5h2.2v2.2h-2.2zM131.9 108.9h2.2v2.2h-2.2zM131.9 113.3h2.2v2.2h-2.2zM131.9 117.7h2.2v2.2h-2.2zM131.9 122.1h2.2v2.2h-2.2zM131.9 126.5h2.2v2.2h-2.2zM131.9 130.9h2.2v2.2h-2.2zM131.9 135.3h2.2v2.2h-2.2zM131.9 139.7h2.2v2.2h-2.2zM131.9 144.1h2.2v2.2h-2.2zM131.9 148.5h2.2v2.2h-2.2zM131.9 152.9h2.2v2.2h-2.2zM133.57 156.73h2.2v2.2h-2.2zM135.23 160.57h2.2v2.2h-2.2zM136.9 164.4h2.2v2.2h-2.2zM138.57 168.23h2.2v2.2h-2.2zM140.23 172.07h2.2v2.2h-2.2zM141.9 175.9h2.2v2.2h-2.2zM143.57 172.07h2.2v2.2h-2.2zM145.23 168.23h2.2v2.2h-2.2zM146.9 164.4h2.2v2.2h-2.2zM148.57 160.57h2.2v2.2h-2.2zM150.23 156.73h2.2v2.2h-2.2zM151.9 152.9h2.2v2.2h-2.2zM151.9 148.5h2.2v2.2h-2.2zM151.9 144.1h2.2v2.2h-2.2zM151.9 139.7h2.2v2.2h-2.2zM151.9 135.3h2.2v2.2h-2.2zM151.9 130.9h2.2v2.2h-2.2zM151.9 126.5h2.2v2.2h-2.2zM151.9 122.1h2.2v2.2h-2.2zM151.9 117.7h2.2v2.2h-2.2zM151.9 113.3h2.2v2.2h-2.2zM151.9 108.9h2.2v2.2h-2.2zM151.9 104.5h2.2v2.2h-2.2zM151.9 100.1h2.2v2.2h-2.2zM151.9 95.7h2.2v2.2h-2.2zM151.9 91.3h2.2v2.2h-2.2zM151.9 86.9h2.2v2.2h-2.2zM151.9 82.5h2.2v2.2h-2.2zM151.9 78.1h2.2v2.2h-2.2zM151.9 73.7h2.2v2.2h-2.2zM151.9 69.3h2.2v2.2h-2.2zM151.9 64.9h2.2v2.2h-2.2zM131.9 85.9h2.2v2.2h-2.2zM136.9 85.9h2.2v2.2h-2.2zM141.9 85.9h2.2v2.2h-2.2zM146.9 85.9h2.2v2.2h-2.2zM151.9 85.9h2.2v2.2h-2.2zM131.9 107.9h2.2v2.2h-2.2zM136.9 107.9h2.2v2.2h-2.2zM141.9 107.9h2.2v2.2h-2.2zM146.9 107.9h2.2v2.2h-2.2zM151.9 107.9h2.2v2.2h-2.2zM131.9 129.9h2.2v2.2h-2.2zM136.9 129.9h2.2v2.2h-2.2zM141.9 129.9h2.2v2.2h-2.2zM146.9 129.9h2.2v2.2h-2.2zM151.9 129.9h2.2v2.2h-2.2z\"\/><path fill=\"#fff\" d=\"M14.9 105.9h2.2v2.2h-2.2zM19.4 105.9h2.2v2.2h-2.2zM23.9 105.9h2.2v2.2h-2.2zM28.4 105.9h2.2v2.2h-2.2zM32.9 105.9h2.2v2.2h-2.2zM71.9 105.9h2.2v2.2h-2.2zM75.4 105.9h2.2v2.2h-2.2zM78.9 105.9h2.2v2.2h-2.2zM117.9 105.9h2.2v2.2h-2.2zM123.9 105.9h2.2v2.2h-2.2zM164.9 105.9h2.2v2.2h-2.2zM169.1 105.9h2.2v2.2h-2.2zM173.3 105.9h2.2v2.2h-2.2zM177.5 105.9h2.2v2.2h-2.2zM181.7 105.9h2.2v2.2h-2.2zM185.9 105.9h2.2v2.2h-2.2zM14.9 137.9h2.2v2.2h-2.2zM19.4 137.9h2.2v2.2h-2.2zM23.9 137.9h2.2v2.2h-2.2zM28.4 137.9h2.2v2.2h-2.2zM32.9 137.9h2.2v2.2h-2.2zM71.9 137.9h2.2v2.2h-2.2zM75.4 137.9h2.2v2.2h-2.2zM78.9 137.9h2.2v2.2h-2.2zM117.9 137.9h2.2v2.2h-2.2zM123.9 137.9h2.2v2.2h-2.2zM164.9 137.9h2.2v2.2h-2.2zM169.1 137.9h2.2v2.2h-2.2zM173.3 137.9h2.2v2.2h-2.2zM177.5 137.9h2.2v2.2h-2.2zM181.7 137.9h2.2v2.2h-2.2zM185.9 137.9h2.2v2.2h-2.2zM14.9 169.9h2.2v2.2h-2.2zM19.4 169.9h2.2v2.2h-2.2zM23.9 169.9h2.2v2.2h-2.2zM28.4 169.9h2.2v2.2h-2.2zM32.9 169.9h2.2v2.2h-2.2zM71.9 169.9h2.2v2.2h-2.2zM75.4 169.9h2.2v2.2h-2.2zM78.9 169.9h2.2v2.2h-2.2zM117.9 169.9h2.2v2.2h-2.2zM123.9 169.9h2.2v2.2h-2.2zM164.9 169.9h2.2v2.2h-2.2zM169.1 169.9h2.2v2.2h-2.2zM173.3 169.9h2.2v2.2h-2.2zM177.5 169.9h2.2v2.2h-2.2zM181.7 169.9h2.2v2.2h-2.2zM185.9 169.9h2.2v2.2h-2.2zM35.9 24.9h2.2v2.2h-2.2zM35.9 29.15h2.2v2.2h-2.2zM35.9 33.4h2.2v2.2h-2.2zM35.9 37.65h2.2v2.2h-2.2zM35.9 41.9h2.2v2.2h-2.2zM161.9 24.9h2.2v2.2h-2.2zM161.9 29.15h2.2v2.2h-2.2zM161.9 33.4h2.2v2.2h-2.2zM161.9 37.65h2.2v2.2h-2.2zM161.9 41.9h2.2v2.2h-2.2zM40.4 24.9h2.2v2.2h-2.2zM44.9 24.9h2.2v2.2h-2.2zM49.4 24.9h2.2v2.2h-2.2zM53.9 24.9h2.2v2.2h-2.2zM58.4 24.9h2.2v2.2h-2.2zM62.9 24.9h2.2v2.2h-2.2zM67.4 24.9h2.2v2.2h-2.2zM71.9 24.9h2.2v2.2h-2.2zM76.4 24.9h2.2v2.2h-2.2zM80.9 24.9h2.2v2.2h-2.2zM85.4 24.9h2.2v2.2h-2.2zM89.9 24.9h2.2v2.2h-2.2zM94.4 24.9h2.2v2.2h-2.2zM98.9 24.9h2.2v2.2h-2.2zM103.4 24.9h2.2v2.2h-2.2zM107.9 24.9h2.2v2.2h-2.2zM112.4 24.9h2.2v2.2h-2.2zM116.9 24.9h2.2v2.2h-2.2zM121.4 24.9h2.2v2.2h-2.2zM125.9 24.9h2.2v2.2h-2.2zM130.4 24.9h2.2v2.2h-2.2zM134.9 24.9h2.2v2.2h-2.2zM139.4 24.9h2.2v2.2h-2.2zM143.9 24.9h2.2v2.2h-2.2zM148.4 24.9h2.2v2.2h-2.2zM152.9 24.9h2.2v2.2h-2.2zM157.4 24.9h2.2v2.2h-2.2z\"\/><\/svg>\n\n<\/div>\n\n\n\n\n\n<div class=\"gb-text cqop-v6-pannello-96ce454\">Simulate the cost of SOA certification<\/div>\n\n\n\n\n\n<a class=\"gb-text cqop-v6-pulsante-5eba899 cqop-v6-state-6d47db8\" href=\"https:\/\/www.cqop.com\/en\/online-services\/fee-and-requirements-calculation\/\">Calculate fees and requirements<\/a>\n\n<\/div>\n\n<\/div>\n\n<\/div>\n\n\n\n\n\n<div class=\"cqop-v6-pannello-1d12dfc\">\n\n<figure class=\"cqop-v6-pannello-ca9f003\">\n\n<div>\n<img decoding=\"async\" class=\"gb-media-cqv61234 cqop-v6-pannello-e34122a gb-text\" src=\"https:\/\/www.cqop.com\/wp-content\/uploads\/2026\/10\/os21_image2-en.webp\" alt=\"The scope of OS21: deep foundations, anchored retaining walls, slope consolidation\"\/>\n<\/div>\n\n\n\n\n\n<figcaption class=\"gb-text cqop-v6-pannello-ad07637\">The scope of OS21: deep foundations, anchored retaining walls, slope consolidation<\/figcaption>\n\n<\/figure>\n\n<\/div>\n\n\n\n\n\n<div class=\"cqop-v6-pannello-13e79de\">\n\n<div class=\"cqop-v6-griglia-74a4c6d\">\n\n<div class=\"cqop-v6-titolo-sticky-1c8b9f9\">\n\n<h2 class=\"gb-text cqop-v6-titolo-ecc189a\">SOA certification OS21: areas of application<\/h2>\n\n<\/div>\n\n\n\n\n\n<div class=\"cqop-v6-pannello-71e1793\">\n<p class=\"gb-text cqop-v6-testo-04d085f\"><strong class=\"cqop-v6-pannello-7f02261\">OS21<\/strong> covers subsoil engineering and consolidation. The main sectors:<\/p>\n\n\n\n\n<ul class=\"cqop-v6-pannello-9bf0cf7\">\n\n<li class=\"gb-text cqop-v6-griglia-eaa3518\">\n              <span aria-hidden=\"true\" class=\"cqop-v6-pannello-17317d0\">01<\/span>\n              <span class=\"cqop-v6-pannello-f3665f8\"><strong class=\"cqop-v6-pannello-7f02261\">Deep foundations:<\/strong> bored piles, driven piles, micropiles and CFA piles, when the ground cannot bear the loads.<\/span>\n            <\/li>\n\n\n\n\n\n<li class=\"gb-text cqop-v6-griglia-d980411\">\n              <span aria-hidden=\"true\" class=\"cqop-v6-pannello-17317d0\">02<\/span>\n              <span class=\"cqop-v6-pannello-f3665f8\"><strong class=\"cqop-v6-pannello-7f02261\">Anchored retaining walls:<\/strong> typical of large urban excavations for car parks, underground railways and tall buildings.<\/span>\n            <\/li>\n\n\n\n\n\n<li class=\"gb-text cqop-v6-griglia-d980411\">\n              <span aria-hidden=\"true\" class=\"cqop-v6-pannello-17317d0\">03<\/span>\n              <span class=\"cqop-v6-pannello-f3665f8\"><strong class=\"cqop-v6-pannello-7f02261\">Ground consolidation:<\/strong> jet grouting, grout injection, ground freezing and deep drainage.<\/span>\n            <\/li>\n\n\n\n\n\n<li class=\"gb-text cqop-v6-griglia-d980411\">\n              <span aria-hidden=\"true\" class=\"cqop-v6-pannello-17317d0\">04<\/span>\n              <span class=\"cqop-v6-pannello-f3665f8\"><strong class=\"cqop-v6-pannello-7f02261\">Slope stability:<\/strong> soil nailing, cable nets and anchors to secure embankments and slopes.<\/span>\n            <\/li>\n\n\n\n\n\n<li class=\"gb-text cqop-v6-griglia-d980411\">\n              <span aria-hidden=\"true\" class=\"cqop-v6-pannello-17317d0\">05<\/span>\n              <span class=\"cqop-v6-pannello-f3665f8\"><strong class=\"cqop-v6-pannello-7f02261\">Underpinning:<\/strong> reinforcement of the foundations of historic or damaged buildings. OS21 only covers the subsoil, not the above-ground parts.<\/span>\n            <\/li>\n\n\n\n\n\n<li class=\"gb-text cqop-v6-griglia-d980411\">\n              <span aria-hidden=\"true\" class=\"cqop-v6-pannello-17317d0\">06<\/span>\n              <span class=\"cqop-v6-pannello-f3665f8\"><strong class=\"cqop-v6-pannello-7f02261\">Foundation-level seismic upgrading:<\/strong> micropiles and ties to improve seismic response, a fast-growing segment.<\/span>\n            <\/li>\n\n\n\n\n\n<li class=\"gb-text cqop-v6-griglia-8357285\">\n              <span aria-hidden=\"true\" class=\"cqop-v6-pannello-17317d0\">07<\/span>\n              <span class=\"cqop-v6-pannello-f3665f8\"><strong class=\"cqop-v6-pannello-7f02261\">Wells:<\/strong> water wells, drainage wells and underground water intakes.<\/span>\n            <\/li>\n\n<\/ul>\n\n\n\n\n<p class=\"gb-text cqop-v6-testo-930206b\"><strong class=\"cqop-v6-pannello-7f02261\">In short:<\/strong> OS21 is the category of the <strong class=\"cqop-v6-pannello-962ca18\">subsoil at work<\/strong>: a technical and protected market, reserved for genuinely well-equipped companies.<\/p>\n<\/div>\n\n<\/div>\n\n<\/div>\n\n\n\n\n\n<div class=\"cqop-v6-pannello-1d12dfc\">\n\n<figure class=\"cqop-v6-pannello-ca9f003\">\n\n<div>\n<img decoding=\"async\" class=\"gb-media-cqv61254 cqop-v6-pannello-e34122a gb-text\" src=\"https:\/\/www.cqop.com\/wp-content\/uploads\/2026\/10\/os21_image3-en.webp\" alt=\"Secant pile wall with multiple anchor tie-backs and deep grouted bulb\"\/>\n<\/div>\n\n\n\n\n\n<figcaption class=\"gb-text cqop-v6-pannello-ad07637\">Secant pile wall with multiple anchor tie-backs and deep grouted bulb<\/figcaption>\n\n<\/figure>\n\n<\/div>\n\n\n\n\n\n<div class=\"cqop-v6-pannello-13e79de\">\n\n<div class=\"cqop-v6-contenuto-c7714c8\">\n\n<h2 class=\"gb-text cqop-v6-titolo-e915111\">SOA categories related to OS21<\/h2>\n\n\n\n\n\n<div class=\"cqop-v6-griglia-86cb130\">\n\n<div class=\"cqop-v6-pannello-12843ab\">\n\n<div class=\"gb-text cqop-v6-pannello-c59b2ea\">OS20-B<\/div>\n\n\n\n\n\n<div class=\"gb-text cqop-v6-pannello-0986e53\">Geognostic surveys<\/div>\n\n\n\n\n<p class=\"gb-text cqop-v6-testo-8d82677\">carries out <strong class=\"cqop-v6-pannello-7f02261\">subsoil surveys<\/strong> (boreholes and tests); OS21 the works that follow.<\/p>\n<\/div>\n\n\n\n\n\n<div class=\"cqop-v6-pannello-12843ab\">\n\n<div class=\"gb-text cqop-v6-pannello-c59b2ea\">OS12-B<\/div>\n\n\n\n\n\n<div class=\"gb-text cqop-v6-pannello-0986e53\">Rockfall barriers, snow fences and similar<\/div>\n\n\n\n\n<p class=\"gb-text cqop-v6-testo-8d82677\">covers <strong class=\"cqop-v6-pannello-7f02261\">passive protection<\/strong> (rockfall nets and barriers); OS21 <strong class=\"cqop-v6-pannello-7f02261\">active anchoring<\/strong> such as tie-backs and soil nails.<\/p>\n<\/div>\n\n\n\n\n\n<div class=\"cqop-v6-pannello-12843ab\">\n\n<div class=\"gb-text cqop-v6-pannello-c59b2ea\">OG1<\/div>\n\n\n\n\n\n<div class=\"gb-text cqop-v6-pannello-0986e53\">Civil and industrial buildings<\/div>\n\n\n\n\n<p class=\"gb-text cqop-v6-testo-8d82677\">builds structures <strong class=\"cqop-v6-pannello-7f02261\">above ground<\/strong>; OS21 everything <strong class=\"cqop-v6-pannello-7f02261\">below<\/strong>.<\/p>\n<\/div>\n\n\n\n\n\n<div class=\"cqop-v6-pannello-12843ab\">\n\n<div class=\"gb-text cqop-v6-pannello-c59b2ea\">OS2-A and OG2<\/div>\n\n\n\n\n\n<div class=\"gb-text cqop-v6-pannello-0986e53\">Restoration and structural repairs<\/div>\n\n\n\n\n<p class=\"gb-text cqop-v6-testo-8d82677\">is needed for the <strong class=\"cqop-v6-pannello-7f02261\">above-ground<\/strong> consolidation of protected heritage; OS21 only for their <strong class=\"cqop-v6-pannello-7f02261\">foundations<\/strong>.<\/p>\n<\/div>\n\n\n\n\n\n<div class=\"cqop-v6-pannello-12843ab\">\n\n<div class=\"gb-text cqop-v6-pannello-c59b2ea\">OG3<\/div>\n\n\n\n\n\n<div class=\"gb-text cqop-v6-pannello-0986e53\">Roads, motorways, bridges, viaducts, railways<\/div>\n\n\n\n\n<p class=\"gb-text cqop-v6-testo-8d82677\">is the category of <strong class=\"cqop-v6-pannello-7f02261\">transport infrastructure<\/strong>; OS21 builds its <strong class=\"cqop-v6-pannello-7f02261\">special foundations<\/strong>.<\/p>\n<\/div>\n\n\n\n\n\n<div class=\"cqop-v6-pannello-12843ab\">\n\n<div class=\"gb-text cqop-v6-pannello-c59b2ea\">OG13<\/div>\n\n\n\n\n\n<div class=\"gb-text cqop-v6-pannello-0986e53\">Naturalistic engineering works<\/div>\n\n\n\n\n<p class=\"gb-text cqop-v6-testo-8d82677\">uses <strong class=\"cqop-v6-pannello-7f02261\">\u201cgreen\u201d<\/strong> techniques for slopes (timber, geosynthetics); OS21 <strong class=\"cqop-v6-pannello-7f02261\">structural<\/strong> ones (tie-backs, micropiles).<\/p>\n<\/div>\n\n\n\n\n\n<div class=\"cqop-v6-pannello-12843ab\">\n\n<div class=\"gb-text cqop-v6-pannello-c59b2ea\">OS18-A<\/div>\n\n\n\n\n\n<div class=\"gb-text cqop-v6-pannello-0986e53\">Steel structural components<\/div>\n\n\n\n\n<p class=\"gb-text cqop-v6-testo-8d82677\">reinforces <strong class=\"cqop-v6-pannello-7f02261\">above-ground<\/strong> structures; OS21 works at foundation level.<\/p>\n<\/div>\n\n<\/div>\n\n<\/div>\n\n<\/div>\n\n\n\n\n\n<div class=\"cqop-v6-pannello-1d12dfc\">\n\n<figure class=\"cqop-v6-pannello-ca9f003\">\n\n<div>\n<img decoding=\"async\" class=\"gb-media-cqv61291 cqop-v6-pannello-e34122a gb-text\" src=\"https:\/\/www.cqop.com\/wp-content\/uploads\/2026\/10\/os21_image4-en.webp\" alt=\"Seismic upgrading of an existing building: floor ties and underpinning micropiles\"\/>\n<\/div>\n\n\n\n\n\n<figcaption class=\"gb-text cqop-v6-pannello-ad07637\">Seismic upgrading of an existing building: floor ties and underpinning micropiles<\/figcaption>\n\n<\/figure>\n\n<\/div>\n\n\n\n\n\n<div class=\"cqop-v6-pannello-13e79de\">\n\n<div class=\"cqop-v6-griglia-74a4c6d\">\n\n<div class=\"cqop-v6-titolo-sticky-1c8b9f9\">\n\n<h2 class=\"gb-text cqop-v6-titolo-ecc189a\">Why it pays to qualify in OS21<\/h2>\n\n<\/div>\n\n\n\n\n\n<div class=\"cqop-v6-pannello-71e1793\">\n<p class=\"gb-text cqop-v6-testo-3c2b5d5\"><strong class=\"cqop-v6-pannello-7f02261\">OS21<\/strong> has high barriers to entry: SIOS constraints, mandatory qualification and the <strong class=\"cqop-v6-pannello-7f02261\">complex machinery licence<\/strong> keep improvised companies out. Demand is growing:<br>\u00b7 <strong class=\"cqop-v6-pannello-7f02261\">hydrogeological instability<\/strong>, affecting over 80% of municipalities;<br>\u00b7 the <strong class=\"cqop-v6-pannello-7f02261\">seismic bonus<\/strong> and post-earthquake reconstruction;<br>\u00b7 <strong class=\"cqop-v6-pannello-7f02261\">special foundations<\/strong> for major works.<\/p>\n\n\n\n<p class=\"gb-text cqop-category-conclusion-accent cqop-v6-testo-23dd753\">If you work on <strong class=\"cqop-v6-pannello-962ca18\">special foundations, micropiles, tie-backs or jet grouting<\/strong>, <strong class=\"cqop-v6-pannello-962ca18\">OS21<\/strong> opens up <strong class=\"cqop-v6-pannello-962ca18\">major contracts<\/strong>, reconstruction and the consolidation of public buildings.<\/p>\n<\/div>\n\n<\/div>\n\n<\/div>\n\n\n\n\n\n<div class=\"cqop-v6-pannello-481eee7\" id=\"faq\">\n\n<div class=\"cqop-v6-griglia-28a732f\">\n\n<div>\n\n<h2 class=\"gb-text cqop-v6-titolo-2c72ce6\">SOA category OS21: frequently asked questions<\/h2>\n\n\n\n\n\n<div class=\"cqop-category-download cqop-category-download-minimal cqop-category-download-faq\">\n<a class=\"gb-text cqop-category-download-button\" href=\"https:\/\/www.cqop.com\/wp-content\/uploads\/2026\/10\/schede-tecniche-soa-strutturate-1.pdf\" target=\"_blank\" rel=\"noopener noreferrer\" aria-label=\"Download PDF technical data sheets \u2014 opens in a new tab\">\n<svg role=\"presentation\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"22\" height=\"22\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"1.7\" stroke-linecap=\"round\" stroke-linejoin=\"round\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M12 3v12m-5-5 5 5 5-5M4 16v5h16v-5\"><\/path><\/svg>\n\n\n<span class=\"gb-text\">Download PDF technical data sheets<\/span>\n<\/a>\n<\/div>\n\n<\/div>\n\n\n\n\n\n<div>\n\n<div class=\"wp-block-essential-blocks-accordion cqop-faq-accordion  root-cqop-faq-96005-0\"><div class=\"eb-parent-wrapper eb-parent-cqop-faq-96005-0 \"><div class=\"eb-accordion-container cqop-faq-96005-0\" data-accordion-type=\"accordion\" data-tab-icon=\"\" data-expanded-icon=\"\" data-transition-duration=\"500\"><div class=\"eb-accordion-inner\">\n\n<div class=\"wp-block-essential-blocks-accordion-item cqop-faq-96005-0-2 eb-accordion-wrapper\" data-clickable=\"false\"><div class=\"eb-accordion-title-wrapper eb-accordion-title-wrapper-cqop-faq-96005-0\" tabindex=\"0\"><div class=\"eb-accordion-title-content-wrap title-content-cqop-faq-96005-0\"><h2 class=\"eb-accordion-title\">What is the complex machinery licence?<\/h2><\/div><\/div><div class=\"eb-accordion-content-wrapper eb-accordion-content-wrapper-cqop-faq-96005-0\"><div class=\"eb-accordion-content\">\n\n<div class=\"gb-text cqop-faq-answer\"><div class=\"cqop-v6-pannello-5afcd04 gb-text\">It is the licence to operate drilling rigs, issued by the Construction Schools. It is mandatory for OS21: the workforce must include licensed operators.<\/div><\/div>\n\n<\/div><\/div><\/div>\n\n\n\n\n\n<div class=\"wp-block-essential-blocks-accordion-item cqop-faq-96005-0-3 eb-accordion-wrapper\" data-clickable=\"false\"><div class=\"eb-accordion-title-wrapper eb-accordion-title-wrapper-cqop-faq-96005-0\" tabindex=\"0\"><div class=\"eb-accordion-title-content-wrap title-content-cqop-faq-96005-0\"><h2 class=\"eb-accordion-title\">What is the difference between OS21 and OS12-B?<\/h2><\/div><\/div><div class=\"eb-accordion-content-wrapper eb-accordion-content-wrapper-cqop-faq-96005-0\"><div class=\"eb-accordion-content\">\n\n<div class=\"gb-text cqop-faq-answer\"><div class=\"cqop-v6-pannello-5afcd04 gb-text\">OS12-B covers nets and barriers that stop rocks that have already broken away. OS21 covers active anchoring, such as tie-backs and soil nails, which fix unstable rock to the stable parts of the slope.<\/div><\/div>\n\n<\/div><\/div><\/div>\n\n\n\n\n\n<div class=\"wp-block-essential-blocks-accordion-item cqop-faq-96005-0-4 eb-accordion-wrapper\" data-clickable=\"false\"><div class=\"eb-accordion-title-wrapper eb-accordion-title-wrapper-cqop-faq-96005-0\" tabindex=\"0\"><div class=\"eb-accordion-title-content-wrap title-content-cqop-faq-96005-0\"><h2 class=\"eb-accordion-title\">Does OS21 include reinforcement of the above-ground parts of buildings?<\/h2><\/div><\/div><div class=\"eb-accordion-content-wrapper eb-accordion-content-wrapper-cqop-faq-96005-0\"><div class=\"eb-accordion-content\">\n\n<div class=\"gb-text cqop-faq-answer\"><div class=\"cqop-v6-pannello-5afcd04 gb-text\">No. It only covers the subsoil: underpinning, footing enlargement, ground consolidation. Above-ground reinforcement falls under other categories.<\/div><\/div>\n\n<\/div><\/div><\/div>\n\n\n\n\n\n<div class=\"wp-block-essential-blocks-accordion-item cqop-faq-96005-0-5 eb-accordion-wrapper\" data-clickable=\"false\"><div class=\"eb-accordion-title-wrapper eb-accordion-title-wrapper-cqop-faq-96005-0\" tabindex=\"0\"><div class=\"eb-accordion-title-content-wrap title-content-cqop-faq-96005-0\"><h2 class=\"eb-accordion-title\">Which works count as CEL for OS21?<\/h2><\/div><\/div><div class=\"eb-accordion-content-wrapper eb-accordion-content-wrapper-cqop-faq-96005-0\"><div class=\"eb-accordion-content\">\n\n<div class=\"gb-text cqop-faq-answer\"><div class=\"cqop-v6-pannello-5afcd04 gb-text\">Piles, micropiles, retaining walls, tie-backs, jet grouting, grout injection, consolidation, slope nailing, underpinning and wells.<\/div><\/div>\n\n<\/div><\/div><\/div>\n\n<\/div><\/div><\/div><\/div>\n\n<\/div>\n\n<\/div>\n\n<\/div>\n\n\n\n\n\n<div class=\"cqop-v6-pannello-5e842af\">\n\n<svg focusable=\"false\" role=\"presentation\" aria-hidden=\"true\" class=\"cqop-v6-icona-71ff866\">\n      <defs>\n        <pattern id=\"mattoniOS21\" width=\"72\" height=\"36\" patternUnits=\"userSpaceOnUse\">\n          <rect x=\"0\" y=\"2\" width=\"32\" height=\"14\" fill=\"rgba(255,255,255,0.022)\"><\/rect>\n          <rect x=\"36\" y=\"2\" width=\"32\" height=\"14\" fill=\"rgba(255,255,255,0.022)\"><\/rect>\n          <rect x=\"18\" y=\"20\" width=\"32\" height=\"14\" fill=\"rgba(255,255,255,0.022)\"><\/rect>\n          <rect x=\"-18\" y=\"20\" width=\"32\" height=\"14\" fill=\"rgba(255,255,255,0.022)\"><\/rect>\n          <rect x=\"54\" y=\"20\" width=\"32\" height=\"14\" fill=\"rgba(255,255,255,0.022)\"><\/rect>\n        <\/pattern>\n      <\/defs>\n      <rect width=\"100%\" height=\"100%\" fill=\"url(#mattoniOS21)\"><\/rect>\n    <\/svg>\n\n\n\n\n\n<div class=\"cqop-v6-griglia-7a21026\">\n\n<div>\n\n<h2 class=\"gb-text cqop-v6-titolo-1522a9c\">Your next move?<\/h2>\n\n\n\n\n<p class=\"gb-text cqop-v6-testo-2d399db\"><strong class=\"cqop-v6-pannello-cff7b97\">Demonstrate your requirements<\/strong> and turn this knowledge into action: make sure you have the right SOA qualification and don\u2019t hesitate to invest in training and innovation.<\/p>\n<\/div>\n\n\n\n\n\n<div class=\"cqop-v6-pannello-4cdb9ad\">\n\n<a class=\"gb-text cqop-v6-pulsante-5eba899 cqop-v6-state-f859560\" href=\"https:\/\/www.cqop.com\/en\/contacts\/\">Contact us<\/a>\n\n\n\n\n\n<a class=\"gb-text cqop-v6-pulsante-0678f05 cqop-v6-state-b958ab0\" href=\"https:\/\/www.cqop.com\/en\/online-services\/fee-and-requirements-calculation\/\">Calculate fees and requirements<\/a>\n\n<\/div>\n\n<\/div>\n\n<\/div>\n\n<\/div>\n\n","protected":false},"excerpt":{"rendered":"<p>OS21 Specialised works categories SOA category OS21 Special structural works Requirement: Permanent staff with a licence to operate complex machinery OS21 relates to specialised structural works: interventions that transfer loads onto soils with low bearing capacity, stabilise the ground, prevent landslides and retrofit existing structures to make them earthquake-resistant. It is one of the most &#8230; <a title=\"SOA category OS21\" class=\"read-more\" href=\"https:\/\/www.cqop.com\/en\/list-of-soa-categories\/specialised-works\/os21\/\" aria-label=\"Read more about SOA category OS21\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":920978,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"_eb_attr":"","_eb_data_table":"","footnotes":""},"class_list":["post-920984","page","type-page","status-publish"],"acf":{"h1_seo":""},"publishpress_future_workflow_manual_trigger":{"enabledWorkflows":[]},"_links":{"self":[{"href":"https:\/\/www.cqop.com\/en\/wp-json\/wp\/v2\/pages\/920984","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.cqop.com\/en\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.cqop.com\/en\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.cqop.com\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.cqop.com\/en\/wp-json\/wp\/v2\/comments?post=920984"}],"version-history":[{"count":8,"href":"https:\/\/www.cqop.com\/en\/wp-json\/wp\/v2\/pages\/920984\/revisions"}],"predecessor-version":[{"id":922318,"href":"https:\/\/www.cqop.com\/en\/wp-json\/wp\/v2\/pages\/920984\/revisions\/922318"}],"up":[{"embeddable":true,"href":"https:\/\/www.cqop.com\/en\/wp-json\/wp\/v2\/pages\/920978"}],"wp:attachment":[{"href":"https:\/\/www.cqop.com\/en\/wp-json\/wp\/v2\/media?parent=920984"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}