{"id":57066,"date":"2026-09-29T16:06:44","date_gmt":"2026-09-29T15:06:44","guid":{"rendered":"https:\/\/ecoforest.com\/?p=57066"},"modified":"2026-09-29T16:06:44","modified_gmt":"2026-09-29T15:06:44","slug":"vertical-vs-horizontal-geothermal-systems-in-spain-permits-costs-and-when-to-choose-each","status":"publish","type":"post","link":"https:\/\/ecoforest.com\/en\/news\/vertical-vs-horizontal-geothermal-systems-in-spain-permits-costs-and-when-to-choose-each\/","title":{"rendered":"Vertical vs. horizontal geothermal systems in Spain: permits, costs, and when to choose each"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><strong class=\"\">Geothermal energy<\/strong> is becoming one of the most efficient solutions for heating and cooling homes and buildings in Spain. However, one of the key steps before installing a geothermal heat pump is deciding between a <strong class=\"\">vertical<\/strong> and a <strong class=\"\">horizontal<\/strong> system, as each has different technical, regulatory, and financial requirements.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In this comprehensive guide, we examine the <strong class=\"\">permits<\/strong> and <strong class=\"\">updated costs for 2025<\/strong>, and provide a <strong class=\"\">clear checklist to help you choose<\/strong> the best option for your project.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">1. Horizontal geothermal systems: conditions and requirements<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">A horizontal ground loop involves <strong class=\"\">burying pipes 1.2\u20132 m deep<\/strong> in a serpentine or spiral pattern, covering a plot area <strong class=\"\">twice the size of the space to be heated and cooled<\/strong>.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong class=\"\">Land required<\/strong>: at least 400\u2013600 m\u00b2 of open land for an average detached house.<\/li>\n\n\n\n<li><strong class=\"\">Soil conditions<\/strong>: the wetter and more clay-rich the soil, the better its thermal conductivity.<\/li>\n\n\n\n<li><strong class=\"\">Restrictions<\/strong>: do not plant deep-rooted trees or cover the trench area with concrete.<\/li>\n\n\n\n<li><strong class=\"\">2025 cost<\/strong>: between <strong class=\"\">\u20ac8,000\u2013\u20ac12,000<\/strong> for a standard home (<a href=\"https:\/\/ecoforest.com\/en\/news\/geothermal-depth\/\" target=\"_blank\" rel=\"noreferrer noopener\">Ecoforest<\/a>).<\/li>\n\n\n\n<li><strong class=\"\">Advantage<\/strong>: more affordable to install if sufficient space is available.<\/li>\n\n\n\n<li><strong class=\"\">Disadvantage<\/strong>: slightly lower performance, affected by seasonal variations in ground temperature.<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">2. Vertical geothermal systems: deep drilling<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">A vertical ground loop uses <strong class=\"\">boreholes 50\u2013150 m deep<\/strong>, with geothermal probes surrounded by bentonite and cement to ensure thermal contact.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong class=\"\">Requirements<\/strong>: at least <strong class=\"\">10 m\u00b2 per borehole<\/strong> to allow drilling.<\/li>\n\n\n\n<li><strong class=\"\">Performance<\/strong>: more stable (30\u201370 W\/m, depending on the ground\u2019s thermal conductivity).<\/li>\n\n\n\n<li><strong class=\"\">2025 cost<\/strong>: between <strong class=\"\">\u20ac15,000\u2013\u20ac25,000<\/strong> for an average detached house (<a href=\"https:\/\/ecoforest.com\/en\/news\/geothermal-depth\/\" target=\"_blank\" rel=\"noreferrer noopener\">Ecoforest<\/a>).<\/li>\n\n\n\n<li><strong class=\"\">Installation time<\/strong>: 5\u20137 days of drilling, 3\u20134 weeks in total for residential projects (<a href=\"https:\/\/ecoforest.com\/en\/news\/geothermal-energy-installation-in-homes-complete-guide-2025-for-spain-portugal-and-italy\/\" target=\"_blank\" rel=\"noreferrer noopener\">Ecoforest<\/a>).<\/li>\n\n\n\n<li><strong class=\"\">Advantage<\/strong>: takes up little space and works on small urban plots.<\/li>\n\n\n\n<li><strong class=\"\">Disadvantage<\/strong>: higher initial investment and drilling permits are required.<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">3. Permits and regulations in Spain (2025)<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">The procedures depend on the type of system:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong class=\"\">Horizontal<\/strong>: a <strong class=\"\">minor works permit<\/strong> is usually sufficient.<\/li>\n\n\n\n<li><strong class=\"\">Vertical<\/strong>: requires a <strong class=\"\">geotechnical report<\/strong> and notification of the drilling to the regional mining\/energy authority. In practice, any borehole deeper than 30 m must be officially registered (Law 22\/1973), and a minimum distance from foundations and trees (\u22651.5\u20132 m) may be required (<a href=\"https:\/\/ecoforest.com\/en\/news\/geothermal-depth\/\" target=\"_blank\" rel=\"noreferrer noopener\">Ecoforest<\/a>).<\/li>\n\n\n\n<li><strong class=\"\">Subsidies<\/strong>: IDAE and regional programs offer grants of up to \u20ac4,000 (horizontal) and \u20ac7,000 (vertical).<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">4. CAPEX and OPEX costs in 2025<\/h4>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Item<\/th><th>Horizontal<\/th><th>Vertical<\/th><\/tr><\/thead><tbody><tr><td>Average investment<\/td><td>\u20ac8,000\u2013\u20ac12,000<\/td><td>\u20ac15,000\u2013\u20ac25,000<\/td><\/tr><tr><td>Annual maintenance<\/td><td>~\u20ac150<\/td><td>~\u20ac300<\/td><\/tr><tr><td>Typical SCOP<\/td><td>3.8\u20134.3<\/td><td>4.5\u20135.0<\/td><\/tr><tr><td>Payback period with grants<\/td><td>8\u201310 years<\/td><td>10\u201312 years<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">A <strong class=\"\">detached house in Bilbao with an \u20ac18,000 vertical system and annual savings of \u20ac1,200 \u2192 ROI \u2248 12 years<\/strong> (<a href=\"https:\/\/ecoforest.com\/en\/news\/geothermal-depth\/\" target=\"_blank\" rel=\"noreferrer noopener\">Ecoforest<\/a>).<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">5. Decision checklist: vertical or horizontal?<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u2705 <strong class=\"\">Choose a horizontal geothermal system<\/strong> if\u2026\n<ul class=\"wp-block-list\">\n<li>Your plot is large (>500 m\u00b2 of open land).<\/li>\n\n\n\n<li>You prefer a lower upfront cost.<\/li>\n\n\n\n<li>You do not mind restrictions on how you use the land (such as not planting deep-rooted trees).<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>\u2705 <strong class=\"\">Choose a vertical geothermal system<\/strong> if\u2026\n<ul class=\"wp-block-list\">\n<li>You have limited space or the home is in an urban area.<\/li>\n\n\n\n<li>You want maximum seasonal performance that remains stable year-round.<\/li>\n\n\n\n<li>You are looking for a longer service life (probes >50 years).<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">6. Conclusion<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">The choice between <strong class=\"\">vertical and horizontal geothermal systems in Spain in 2025<\/strong> comes down to three factors: <strong class=\"\">available space, upfront budget, and the plot\u2019s regulatory requirements<\/strong>. Both options can deliver savings of 60\u201375% on heating and cooling, but <strong class=\"\">vertical systems offer higher, more stable performance<\/strong> without the land constraints of horizontal systems.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">To learn more about the technology, we recommend reading our cornerstone article: <a href=\"https:\/\/ecoforest.com\/en\/heat-pumps\/ground-source-heat-pumps\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong class=\"\">Geothermal heat pumps: an efficient and environmentally responsible alternative<\/strong><\/a>. And if you would like to see real-world examples, visit our <a href=\"https:\/\/ecoforest.com\/en\/?p=34683\" target=\"_blank\" rel=\"noreferrer noopener\"><strong class=\"\">Ecoforest geothermal projects<\/strong><\/a> section, where we showcase both vertical and horizontal installations.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Geothermal energy is becoming one of the most efficient solutions for heating and cooling homes and buildings in Spain. However, one of the key steps before installing a geothermal heat pump is deciding between a vertical and a horizontal system, as each has different technical, regulatory, and financial requirements. In this comprehensive guide, we examine [&hellip;]<\/p>\n","protected":false},"author":17,"featured_media":48797,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_kad_blocks_custom_css":"","_kad_blocks_head_custom_js":"","_kad_blocks_body_custom_js":"","_kad_blocks_footer_custom_js":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center 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