What a TVIA is

What is a townscape and visual impact assessment, and which AVRs does it require?

A townscape and visual impact assessment is the planning document that evaluates how a proposed development changes the character, appearance and visual receptors of its urban setting. GLVIA3 supplies the assessment framework. Architectural Visualisations London produce the Accurate Visual Representations (AVRs) that give the assessor photographic evidence for sensitivity, magnitude and significance judgements.

How a TVIA is structured, and AVL's role inside it

The TVIA report records existing townscape character through a Townscape Character Assessment (TCA), fixes agreed viewpoints with the Local Planning Authority (LPA), then scores the proposed scheme from those positions. AVL's role is technical: photography, 3D modelling and compositing to TGN 06/19 specification. The landscape architect's role is interpretive: sensitivity, magnitude and significance scoring.

Who authors a TVIA and what does AVL produce?

The landscape architect or townscape consultant authors the TVIA narrative, TCA, viewpoint justification and significance conclusions. AVL supplies the visual evidence: agreed-viewpoint photography, the proposed 3D model, and AVR photomontages composited at the correct scale and perspective for the specified AVR level.

AVR Level 2 realistic photomontage for a London TVIA planning submission, showing a proposed residential building composited into an existing Hackney streetscape — Hackney. AVR Level 2 produced to TGN 06/19 specification for a TVIA planning submission.

Trigger conditions

When does a London planning application require a TVIA, and at which AVR level?

A London planning application requires a TVIA when the proposal crosses a threshold where the LPA or a statutory consultee demands formal assessment of visual impact on the urban setting. In practice, development scale, heritage designation, and proximity to a strategic viewing corridor or London View Management Framework (LVMF) corridor are the most common triggers across London boroughs.

Environmental Impact Assessment (EIA) threshold scheme TVIA required

All EIA applications; visual impact is a mandatory chapter
Tall buildings (above borough threshold) TVIA required

London Plan policy plus borough tall buildings SPD
Conservation area: substantial alteration or demolition TVIA required

LPA heritage officer discretion; validation list requirement
Listed building setting TVIA required

Historic England advice plus LPA validation checklist
London View Management Framework (LVMF) designated viewing corridor TVIA requiredAVR Level 3

LVMF Supplementary Planning Guidance, regardless of borough policy
Minor extension in a non-sensitive area TVA possible

LPA pre-application guidance determines the appropriate assessment level

AVR Level 2 to 3 photomontage of a tall residential building above the borough threshold composited into a London streetscape with an LVMF strategic-view corridor visible across the Thames in the background, illustrating two TVIA trigger conditions active at once — Tall-building scheme above the borough threshold near an LVMF protected corridor. Both triggers active, so AVR Level 3 evidence is required.

Below EIA threshold, heritage designation and policy context usually decide the TVIA requirement. Schemes near World Heritage Sites, conservation areas, listed buildings or LVMF corridors need early confirmation from the LPA because the required AVR level can change the photography, survey and production scope.

Assessment types

TVIA, TVA or Heritage TVIA: which assessment fits your London scheme?

Three related assessment types apply to London planning: the Townscape Visual Appraisal (TVA), the full Townscape and Visual Impact Assessment (TVIA), and the Heritage Townscape and Visual Impact Assessment (HTVIA). They differ by trigger, methodology depth, and the AVR level each requires. The LPA confirms the appropriate type at pre-application stage.

TVA

Townscape Visual Appraisal

Trigger: Minor proposals in sensitive settings; early design stage appraisal
Typical AVR Level: 0 to 1 (wireline or approximate photomontage)
Lead author: Townscape consultant
Typical timeline: 2 to 4 weeks

TVIA

Townscape and Visual Impact Assessment

Trigger: Full EIA or LPA-required visual impact; all EIA threshold schemes
Typical AVR Level: 2 (realistic photomontage)
Lead author: Landscape architect
Typical timeline: 4 to 8 weeks

Heritage TVIA

Heritage Townscape and Visual Impact Assessment (HTVIA)

Trigger: Schemes affecting designated heritage assets: conservation areas, listed buildings, WHS settings
Typical AVR Level: 2 to 3, plus GIS viewshed analysis in some cases
Lead author: Landscape architect plus heritage consultant
Typical timeline: 6 to 12 weeks

The landscape architect advising on the planning application confirms which assessment type applies, then commissions the AVR level required for the evidence base. AVL produces AVRs for TVA, TVIA and HTVIA submissions, but the assessor remains responsible for the conclusion.

AVR evidence

AVR levels and photomontage in a TVIA: what to commission for each scheme

An Accurate Visual Representation (AVR) is the verified photomontage or CGI view embedded in a TVIA. It gives planning officers and decision-makers a controlled view of how the proposal will appear from each agreed viewpoint, which is the basis for the magnitude-of-change score.

AVR Level 0 wireline overlay on a London baseline photograph, showing the wireframe of a proposed residential building positioned over a Camden conservation area streetscape, used at pre-application stage to verify massing and position before the AVR Level 2 photomontage is produced — Camden. AVR Level 0 wireline overlay on baseline photograph from an agreed viewpoint, used to verify massing and position before progressing to AVR Level 2.

TGN 06/19 (current at time of publication, subject to ongoing Landscape Institute review and the August 2024 clarification LITGN-2024-01) defines four AVR levels, each suited to a different assessment context:

AVR Level 0: wireline or massing overlay on the baseline photograph. Used for early design-stage discussions and pre-application appraisals where precise material is not yet fixed.
AVR Level 1: approximate photomontage with basic material indication. Suitable for TVA-level assessments or where distance renders fine detail irrelevant.
AVR Level 2: realistic photomontage with matched materials, lighting and shadow. The standard level for most TVIA submissions to London LPAs.
AVR Level 3: survey-controlled photomontage requiring GCP verification, lens calibration, and a licensed surveyor witness statement. Mandatory for LVMF strategic viewpoints and recommended for WHS settings.

A planning photomontage without survey control is not an AVR. The landscape architect specifies the AVR level; AVL produces the image to that specification. For the full production workflow, see our verified views and AVR service.

AVR Level 2 realistic photomontage for a London TVIA planning submission, showing a proposed mixed-use building composited into an existing Tower Hamlets streetscape — Tower Hamlets. AVR Level 2 produced to TGN 06/19 specification for a TVIA planning submission.

Baseline and viewpoints

Viewpoint selection, baseline photography and TCA: what to brief AVL on

The landscape architect and LPA agree viewpoint positions at pre-application stage, using the Townscape Character Assessment (TCA) to map receptors, character areas and public views. AVL then photographs each agreed viewpoint to TGN 06/19 specification, creating the baseline image for the AVR.

What a Townscape Character Assessment records

The TCA records grain, massing, building heights, materials, street hierarchy, vegetation and landmark relationships. Those attributes determine receptor sensitivity, which then feeds the GLVIA3 significance matrix.

A Zone of Theoretical Visibility (ZTV) analysis runs before viewpoints are fixed. The ZTV uses a digital terrain model to map the visible envelope around the proposed scheme, ruling out receptors with screened views and surfacing receptors the landscape architect must include in the TVIA. The output narrows the candidate viewpoint list before the LPA agreement meeting.

Zone of Theoretical Visibility plan diagram for a London TVIA, showing the visible envelope spreading outward from a small red building footprint with six numbered viewpoint markers placed around the visible area, a north arrow and a scale bar — ZTV plan for a London TVIA. The visible envelope around the proposed footprint locates six candidate viewpoints before the LPA agreement meeting.

Baseline photography needs a tripod-mounted full-frame camera, calibrated lens, recorded camera position and height, horizon control, and lighting notes. The GPS-surveyed position lets the proposed building be composited at correct scale and perspective.

Agreeing viewpoints at pre-application stage

At pre-application stage, the LPA confirms public viewpoints, heritage constraints, LVMF constraints and the required AVR level. AVL checks each confirmed position before the site visit, flags access or line-of-sight issues, and builds the photography schedule around the agreed viewpoint location plan.

Sensitivity and magnitude

GLVIA3 sensitivity and magnitude: how visual impact is scored

GLVIA3 structures the significance judgement around two axes: receptor sensitivity and magnitude of change. The landscape architect combines those axes into a significance conclusion for each viewpoint. The accuracy of that conclusion depends directly on the quality of the AVRs that show what the change looks like from the assessed position.

LVMF strategic view from the Greenwich World Heritage Site across the Thames to the City of London skyline with a CGI wireframe massing test inserted in the middle distance, illustrating an AVR Level 3 sightline assessment used as TVIA evidence — Greenwich World Heritage Site to the City of London. LVMF strategic view with a CGI wireframe massing test in the middle distance, the kind of AVR Level 3 evidence required where a scheme intersects a protected sightline.

GLVIA3 significance matrix: receptor sensitivity versus magnitude of change
Sensitivity / Magnitude	Major change	Moderate change	Minor change	Negligible change
High sensitivity	Major	Major to Moderate	Moderate	Minor
Medium sensitivity	Major to Moderate	Moderate	Minor to Moderate	Negligible to Minor
Low sensitivity	Moderate	Minor to Moderate	Minor	Negligible

Receptor sensitivity reflects how susceptible the viewpoint is to visual change: conservation-area streets, designated open spaces and LVMF corridors score higher than screened or low-access industrial settings.

Magnitude of change records how much the proposal alters the view: visibility, frame occupation, obstruction, new elements, material contrast and massing relationship. The landscape architect derives that score from the AVR evidence.

Major Adverse and Negligible conclusions both need defensible evidence. The LPA will test the submitted methodology and the AVR standard during validation.

Townscape character effects versus visual receptor susceptibility (LITGN-2024-01)

Townscape Character Area (TCA) effects: Physical and aesthetic change to the urban fabric: density, block pattern, heights, materials, greenery and historic character. TCA sensitivity weighs the baseline value against its capacity to absorb change, following the Landscape Institute's August 2024 clarification (LITGN-2024-01).
Visual receptor susceptibility: How people experience the change, set by their activity. Residents and conservation-area walkers are highly susceptible; passing motorists on arterial roads much less so.

Scale, duration and geographical extent of the change

Scale and magnitude: The prominence of the new element: visual contrast, silhouette and volume, skyline and backdrop effect, and whether it reads as a landmark or an intrusion.
Duration and geographical extent: Short-term construction effects are separated from the permanent scheme, then the reach is mapped: street level, local neighbourhood, and wider regional viewing corridors.

Policy framework

London planning policy and TVIA: GLVIA3, TGN 06/19 and borough validation requirements

London TVIA requirements combine GLVIA3 methodology, TGN 06/19 AVR production standards, GLA visual impact policy and borough validation lists. The landscape architect confirms the applicable standard at pre-application stage because one borough may require a higher AVR level than another.

London policy and validation checks that affect TVIA visual evidence
Policy or validation source	What it changes	AVL output affected
LVMF protected view	Raises strategic-view evidence to AVR Level 3 where the proposal enters a protected corridor	Survey control, lens calibration, ground control points and witness statement
London Plan D11 and HC1	Triggers tall-building, heritage and townscape evidence for major applications	Viewpoint photomontages, baseline views and AVR methodology notes
Borough validation list	Confirms whether the LPA names TVIA, TGN 06/19, AVR level or viewpoint requirements explicitly	Brief scope, photography schedule and number of deliverable views
TGN 06/19 review status	Requires the commissioning landscape architect to confirm the current accepted technical standard	AVL produces to the version specified for the commission

AVR Level 3 LVMF strategic view across the Thames toward the City of London skyline with a CGI insertion of a proposed tall building in the middle distance, paired with a faint planning validation document overlay in the lower left, illustrating Tower Hamlets borough TGN 06/19 and AVR level requirements — Tower Hamlets validation checklist names TGN 06/19 and AVR level explicitly. The AVR Level 3 LVMF view above is produced to that specification.

Tower Hamlets is the clearest London example because its major-application validation checklist names TGN 06/19 and AVR level requirements. Westminster, Islington, Southwark and Camden often leave the final specification to the landscape architect and LPA pre-application agreement, so early confirmation remains the safest route.

Protected vistas, river prospects, linear views, and Richmond Hill's 1902 Act

The London View Management Framework (LVMF) identifies four distinct categories of protected urban vistas:

London Panoramas: Broad views across the wider city skyline from specific elevated parks like Parliament Hill, Kenwood House, Primrose Hill, Greenwich Park, and Blackheath.

River Prospects & Linear Views: River prospects protect views along the Thames from key bridges (Waterloo, Westminster) and walkways. Linear views protect precise visual sightlines to a strategic landmark object, such as St Paul's Cathedral.

Richmond Hill Exception: The view from Richmond Hill is the only one in the UK protected by a dedicated Act of Parliament (1902), predating the modern LVMF SPG.

Understanding viewing corridors, background consultation planes, and sky space

Protected vistas are governed by mathematically calculated 3D sightline cones that extend from defined public viewing points to designated landmarks.

Viewing Corridors: The central core must remain entirely clear of obstacles. No physical development is allowed to protrude into this protected sky space.

Background Consultation Planes: Extend behind the historic landmark. Any proposed development located inside these planes must remain below calculated heights to ensure the landmark's silhouette stands out clearly against the sky.

CGI verified views for LVMF compliance: securing GLA referrals

Where a tall building proposal (typically 25m+ in conservation areas, or 30m+ elsewhere in London) impacts a designated strategic vista, the application is referred to the Greater London Authority (GLA).

AVL produces high-resolution, survey-controlled AVR Level 3 photomontages designed to pass rigorous GLA scrutiny. These models are precisely aligned using dual-frequency RTK GPS receivers, lens-calibration EXIF data, and verifiable Root Mean Square (RMS) alignment calculations to ensure absolute data integrity.

For the wider submission context, see our planning application visuals required for London submissions service page.

AVL deliverables

TVIA visual evidence for major London applications: what AVL delivers

Architectural Visualisations London produce the AVR evidence package that the landscape architect incorporates into the TVIA: survey-controlled baseline photography, TGN 06/19 compliant photomontages, wireline overlays, viewpoint location plans and supplementary CGI views.

On a major TVIA project, the landscape architect leads the TVIA narrative while AVL supplies the visual evidence. The two tracks run in parallel and meet in the submitted report.

What AVL delivers against a TVIA commission:

Baseline photography from agreed viewpoints, TGN 06/19 compliant, with survey notes and camera data sheet
AVR Level 0 wireline overlays for early-stage or pre-application views
AVR Level 2 realistic photomontages for standard TVIA submission viewpoints
AVR Level 3 survey-controlled photomontages for LVMF strategic viewpoints, with GCP survey and lens calibration
Viewpoint location plan with GPS-confirmed shooting positions
AVR technical methodology statement for inclusion in the TVIA appendix
Iterative revision against the landscape architect's review comments before submission

AVL does not author the TVIA report, the TCA, or the significance conclusions. Those remain with the landscape architect or townscape consultant leading the TVIA.

Baseline and AVR Level 2 proposed view pair for a London TVIA showing existing Southwark streetscape alongside photomontage of the proposed scheme — Southwark. AVR Level 2 proposed view, produced as one half of the matched baseline-versus-proposed pair submitted for the TVIA.

Start the brief

Request TVIA visualisation support

Send the LPA, heritage designation status, agreed viewpoints and submission deadline. Architectural Visualisations London will confirm scope, AVR level and turnaround within one working day.

Fee depends on AVR level, viewpoint count, heritage context and deadline. We quote per scheme after a short brief.

Architectural Visualisations London produces TVIA visualisations for London planning applications at every stage, from pre-application advice through to committee submission and appeal.

Townscape and Visual Impact Assessment visualisations for London planning