House Extension Cost in North London: 2026 Pricing Breakdown
Quick AnswerHouse extensions in North London cost between £3,000 and £5,000 per square metre in 2026, depending on extension type and specification level. A standard single-storey rear extension of 20 to 30m² costs £75,000 to £135,000 all-in, including VAT and professional fees. A side return extension runs £40,000 to £75,000. A loft conversion costs £55,000 […]