Townscape and Visual Impact Assessment

A verified view (also called an Accurate Visual Representation or AVR) is a photomontage created using precisely surveyed camera positions, calibrated photography, and a three-dimensional computer model of the proposed building inserted into the photograph. The process is technically rigorous and ensures the image accurately shows the scale, position, and appearance of the development as it would be seen from each viewpoint. AVRs are classified from Level 0 (location and massing only) to Level 3 (photorealistic render with materials and lighting).

Viewpoints are selected to represent the range of views from which the development would be visible, including public spaces, streets, parks, and elevated positions. The choice should cover near, middle-distance, and long-range views and include views from heritage assets, designated landscapes, and protected viewing corridors. Viewpoint selection is typically agreed with the local planning authority through pre-application discussions, and the authority may request additional viewpoints.

A Townscape and Visual Impact Assessment focuses on the urban environment, assessing effects on streets, squares, built form, and urban character. A Landscape and Visual Impact Assessment addresses rural and semi-rural landscapes, assessing effects on landscape character, features, and views in the countryside. Both follow the same GLVIA3 methodology but apply it to different contexts. Some developments on the urban fringe may require elements of both.

Not automatically, but most planning authorities require a TVIA for buildings that are significantly taller than their context. In London, the definition of a tall building varies by borough, ranging from 18 metres to 30 metres. Many local plans set specific height thresholds above which a TVIA is mandatory. Even below these thresholds, a TVIA may be requested if the development is in a sensitive location or would affect important views.

A TVIA will assess the visual impact on the setting of heritage assets such as listed buildings, conservation areas, Scheduled Monuments, and registered parks. However, it does not replace a Heritage Statement or full Heritage Impact Assessment. Where heritage is a key issue, the TVIA and heritage assessment should be prepared in coordination, and the heritage consultant should contribute to the assessment of significance of effects on heritage settings.

GLVIA3 refers to the third edition of the Guidelines for Landscape and Visual Impact Assessment, published jointly by the Landscape Institute and the Institute of Environmental Management and Assessment. It is the industry-standard methodology for assessing landscape and visual effects of development in the UK. The guidelines set out how to establish baseline conditions, predict effects, assess magnitude and sensitivity, and determine significance of impact.

Yes. TVIAs often inform iterative design development, with the assessment revealing views where the impact is most significant. Common design responses include reducing building height, stepping back upper floors, adjusting massing and articulation, selecting contextually appropriate materials, and improving the quality of ground-level public realm. The final TVIA should demonstrate how the design has responded to the assessment findings.

Cumulative impact considers the combined effect of the proposed development alongside other consented or proposed schemes in the area. In rapidly developing urban areas, a single building may have a modest impact, but the cumulative effect of several new developments may fundamentally alter the townscape character. Planning authorities increasingly require TVIAs to include cumulative impact analysis showing the proposed development in the context of other pipeline schemes.

The London View Management Framework (LVMF) is Supplementary Planning Guidance adopted by the Mayor of London that identifies strategically important views across the capital. It designates specific viewing corridors protecting views of landmarks such as St Paul's Cathedral and the Palace of Westminster. Any development that falls within or is visible from an LVMF view must be assessed against the Framework, and the GLA will scrutinise TVIAs for these schemes closely.

Night-time verified views may be requested for developments that will have significant lighting or illuminated facades, particularly tall buildings, commercial developments with extensive glazing, and schemes in the setting of floodlit heritage assets. The local authority will specify during viewpoint agreement whether night-time views are required. They add complexity and cost to the TVIA but can be important in demonstrating the full impact of a development.