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The Extension Price Guide 2026

All costs of a prefab extension at a glance — honest, concrete and without sales talk. Downloads instantly.

• 2026 market prices per m² and per size (6–24 m²)
• What makes up the price: from foundation to permit
• Prefab vs traditional building — the honest difference
• The 2026 permit rules: when can you build permit-free?
• 5 smart ways to save + financing options