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As energy prices continue to rise across the UK, more homeowners are searching for smarter ways to build and renovate. One of the most effective solutions is the Passive House (Passivhaus) standard, a proven method of creating ultra energy-efficient homes that dramatically reduce heating costs. At Mars Building, we work with homeowners across Hertfordshire, St Albans, Welwyn Garden City, Hertford, and Knebworth to design and build sustainable, high-performance homes that are