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  • Part A: Structure19
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  • Part L: Energy Efficiency23
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This service provides general guidance based on published building standards. It is not a substitute for professional advice from a licensed building surveyor or certifier.

Part L: Energy Efficiency

Conservation of fuel and power in new and existing buildings

23 articles

Overheating in New Dwellings: Approved Document O

Requirements to mitigate overheating risk in new homes under Approved Document O.

14 Apr 2026·3 min read

Part L Overview: Conservation of Fuel and Power

Overview of Approved Document L requirements for energy efficiency in new and existing buildings in England.

14 Apr 2026·3 min read

U-Value Requirements and Insulation Standards

Guide to U-value requirements for walls, roofs, floors, and windows under Approved Document L, with insulation specifications.

14 Apr 2026·3 min read

Air Tightness Testing Requirements

Requirements for air permeability testing in new dwellings and non-domestic buildings under Approved Document L.

14 Apr 2026·3 min read

Heat Pump Requirements and Low-Carbon Heating

Requirements for heat pumps and low-carbon heating systems under the 2021 Part L and the Future Homes Standard.

14 Apr 2026·4 min read

Energy Performance Certificates Explained

Complete guide to EPCs in the UK including ratings, requirements, MEES regulations, and exemptions.

14 Apr 2026·3 min read

Thermal Bridging and Accredited Construction Details

Understanding thermal bridges, psi-values, and the use of Accredited Construction Details under Part L.

14 Apr 2026·3 min read

Solar Panel and Renewable Energy Requirements

Requirements and incentives for solar PV, solar thermal, and other renewable energy systems under Part L and the Smart Export Guarantee.

14 Apr 2026·3 min read

Replacement Windows and Doors Energy Requirements

Energy performance requirements for replacement windows and doors in existing buildings under Approved Document L.

14 Apr 2026·3 min read

Future Homes Standard 2025

What the Future Homes Standard means for new homes, including carbon emission targets, fabric standards, and heating systems.

14 Apr 2026·3 min read

Non-Domestic Building Energy Requirements

Energy efficiency requirements for offices, shops, and other non-domestic buildings under Approved Document L.

14 Apr 2026·3 min read

Insulation Requirements for Existing Buildings

Energy efficiency upgrade requirements when renovating existing buildings under Approved Document L Volume 2.

14 Apr 2026·3 min read

Heating System Efficiency Requirements

Minimum efficiency standards for boilers, heat pumps, and other heating systems under Part L.

14 Apr 2026·3 min read

Part L Compliance for Building Extensions

Energy efficiency requirements for domestic and non-domestic extensions under Approved Document L.

14 Apr 2026·2 min read

Boiler Replacement Requirements

What Building Regulations require when replacing a gas or oil boiler in an existing dwelling.

14 Apr 2026·2 min read

Cavity Wall Insulation Requirements

Guide to cavity wall insulation in existing buildings, including suitability, installation methods, and guarantees.

14 Apr 2026·2 min read

Loft Insulation Standards and Installation

Requirements and best practice for loft insulation in UK dwellings.

14 Apr 2026·2 min read

Flat Roof Insulation Methods

Insulation requirements and methods for flat roofs under Part L.

14 Apr 2026·2 min read

Window Energy Ratings Explained

Understanding Window Energy Ratings (WER) and how they relate to Part L compliance.

14 Apr 2026·2 min read

Underfloor Heating Design and Energy Efficiency

Energy efficiency considerations for underfloor heating systems under Part L.

14 Apr 2026·3 min read
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