Heritage Significance in NPPF Terms: A Plain-English Definition
On 17 August 2026 the Government published a revised National Planning Policy Framework, which is a material consideration in decisions from that date. It restructured the historic environment chapter into thematic policies (HE1 to HE9) and no longer uses the numbered paragraph citations below (the NPPF glossary definition of significance itself is unchanged).
Under the 2026 Framework, applicants assess the significance of the assets affected and the likely effect of the proposal under Policy HE5, on a five-point scale: positive effect, no effect, harm, substantial harm, or total loss. The two-tier ‘substantial / less than substantial harm’ test has been removed and the phrase ‘less than substantial harm’ no longer appears. Harm to a designated heritage asset is now weighed under Policy HE6, where any harm is a matter of considerable importance and weight; non-designated assets are dealt with under Policy HE7. The explanation below describes the framework that applied until 16 August 2026 and is being updated. Always check the current NPPF at gov.uk.
The NPPF glossary defines significance as 'the value of a heritage asset to this and future generations because of its heritage interest. The interest may be archaeological, architectural, artistic or historic. Significance derives not only from a heritage asset's physical presence, but also from its setting.' This four-value framing is operationalised by GPA 2 and the English Heritage 2008 Conservation Principles, which subdivides into evidential, historical, aesthetic and communal values.
The four heritage values
- Evidential value. What the fabric, layout or context tells us about past human activity. A timber-frame survival in a brick-faced terrace has evidential value disproportionate to its visible footprint.
- Historical value. Illustrative or associative connections with past people, events or aspects of life. A house once occupied by a notable figure carries associative historical value; a vernacular farmhouse illustrating an extinct way of life carries illustrative historical value.
- Aesthetic value. The way the asset draws sensory and intellectual stimulation. Includes design value (intended) and fortuitous value (the picturesque accumulation).
- Communal value. Meanings of the asset for the people who relate to it, including commemorative, symbolic and social dimensions.
How to demonstrate significance in a Heritage Statement
Walk each of the four values in turn, with evidence. Cite the listing description but go beyond it, the listing entry is a summary, not the totality of significance. Use the 1950s-1960s Royal Commission inventories, the Pevsner Buildings of England series, the National Heritage List for England, and the LPA's own conservation-area appraisal where one exists.
Why significance determines the harm test
The greater the significance, the greater the weight given to its conservation under NPPF ¶205. A Grade I asset attracts 'great weight' and triggers the substantial-harm test of NPPF ¶200 at a lower threshold of physical change than a Grade II asset. This is why a like-for-like sash window replacement on a Grade I building can require an HIA where it would not on a Grade II.