The legislative and policy environment shaping every scheme.

Energy performance of existing buildings has moved from a discretionary improvement to a regulated commercial constraint. Limewise specifies and procures every project against the prevailing framework — and the framework, in turn, is the engine of the practice's economics: it prices underperformance into acquisition and rewards verified quality at completion.

Statutory and policy framework

Climate Change Act 2008 (as amended, 2019) — establishes the United Kingdom's legally binding target of net-zero greenhouse gas emissions by 2050. The Sixth Carbon Budget, set in law in 2021, requires a 78 % reduction against the 1990 baseline by 2035. Buildings sit within the cross-economy trajectory and are explicitly addressed by sectoral policy.
Minimum Energy Efficiency Standards (MEES) — non-domestic privately let property has been required to hold an EPC of E or better since April 2023. Government proposals consulted in 2021 set a trajectory to EPC C by 2027 and EPC B by 2030 for commercial leasing. Domestic privately rented property must hold an EPC of E or better, with consultation in train to raise the threshold to EPC C for new tenancies from 2028 and all tenancies from 2030.
Future Homes Standard (2025) and Future Buildings Standard — uplifts to Building Regulations Approved Document L (conservation of fuel and power) and Approved Document F (ventilation) mandating 75 – 80 % lower regulated carbon emissions for new construction. The standard sets the operational performance benchmark against which any retrofit specification should be assessed.
PAS 2035:2023 (domestic) and PAS 2038:2021 (non-domestic) — the publicly available specifications, published by BSI, for whole-building retrofit. They cover risk assessment, occupant engagement, design, installation, commissioning and post-completion verification. Required for any retrofit funded under publicly-backed schemes (ECO4, Great British Insulation Scheme, Warm Homes: Social Housing Fund) and increasingly written into private institutional requirements.
Heat and Buildings Strategy (2021) and Clean Power 2030 — set the trajectory for the decarbonisation of heat, principally through air-source and ground-source heat pumps, district heat networks, and the phased withdrawal of new fossil-fuel boiler installations. The Boiler Upgrade Scheme provides capital grant support for domestic heat pump installations.
RICS Whole Life Carbon Assessment, 2nd edition (2023) — the methodology by which embodied and operational carbon are quantified together across a building's modules A to D. Increasingly required by planning authorities (the Greater London Authority, a growing number of English local plans) and lender ESG criteria for both new build and major refurbishment.
Building Safety Act 2022 and the Higher-Risk Buildings regime — sets out the duty-holder framework, gateway approvals, and golden-thread information obligations for higher-risk buildings, and influences the wider competence and documentation requirements applicable to all major works.
Energy Performance of Buildings (England and Wales) Regulations 2012 — the underlying instrument requiring an EPC at point of sale, lease or significant works, and the legal basis on which MEES is enforced.