As pressure to decarbonise the existing housing stock intensifies, conservation areas are frequently portrayed as sites where heritage protection and climate action are incompatible. Planning and heritage policy are often framed as obstacles to retrofit, yet there remains a lack of systematic empirical evidence on how Local Planning Authorities (LPAs) interpret and manage retrofit proposals in these contexts.

This paper draws on findings from a national survey of LPAs in England, exploring how planners understand and adjudicate retrofit within conservation areas. The analysis reveals that retrofit is widely supported in principle. The central challenge, however, is not whether retrofit can occur, but whether planning systems, guidance and knowledge infrastructures are sufficiently equipped to enable sensitive and effective low-carbon interventions. Key barriers include inconsistent guidance, variable knowledge quality and limited technical capacity, rather than conservation policy itself. At the same time, retrofit proposals are subject to additional scrutiny and procedural complexity, with decisions often hinging on considerations of design, materials, and visual impact.

Tensions between heritage protection and climate goals do arise (most notably in relation to external wall insulation and visually intrusive technologies) but these are typically managed through negotiation, alternative siting or revised designs rather than outright refusal. The survey highlights that the most significant obstacles to low-carbon retrofit are not heritage policies per se, but poor-quality applications, limited applicant and installer expertise, and a lack of clear national and local guidance. Respondents also point to misinformation, inconsistent policy signals, and subsidy schemes that promote inappropriate solutions as factors that exacerbate perceived conflicts.

Notably, many planners express a desire for a more proactive and enabling approach to decision-making. The paper contributes to debates on climate transitions and environmental planning by reframing conservation not as a barrier to action, but as a context that demands higher-quality, better-informed planning practice. In doing so, it positions planning as a critical mediator of just and effective climate transitions, “building planning up” rather than casting it as an impediment.