Tag: Thermal bridging

Modern rear house extension conversion with open-plan kitchen, sliding glass doors, skylights, and landscaped patio in a renovated brick family home.

Extension Conversion: What It Is, Costs, Planning Permission & Building Regs (UK)

May 25, 2026 No Comments

Extension Conversion usually means upgrading an existing space like a conservatory or garage so it becomes a warm, compliant room that feels part of the main house. This guide covers planning permission checks, Building Regulations, typical UK costs, common pitfalls, and a simple step-by-step checklist so you can plan confidently and avoid problems later.

Cross-section diagram of a residential house highlighting key energy efficiency components such as insulation, airtightness, ventilation, and high-performance materials, in compliance with Building Regulations Part L.

Building Regulations Part L: Insulation, Energy Efficiency & What You Must Know

December 14, 2025 No Comments

Building Regulations Part L sets the energy efficiency rules for UK home projects. This guide explains what Part L covers, how U-values and insulation affect extensions and conversions, and why ventilation (Part F) matters when you improve airtightness. Learn what Building Control looks for, what evidence to keep, and how to avoid costly changes mid-build.