Separating landscape and visual effects under GLVIA3

Landscape and visual effects separation is the structural requirement that submitted reports get wrong most often. The third edition of the Guidelines for Landscape and Visual Impact Assessment asks for two assessments, carried out in parallel, with their own receptors, their own judgements and their own conclusions. One is about effects on the landscape as a resource. The other is about effects on views and visual amenity experienced by people.

Collapse them into a single table and the assessment becomes unusable. The authority's landscape adviser cannot tell whether a judgement of moderate adverse effect relates to the character of a valley or to the outlook from a farmhouse, and neither can an inspector.

The two assessments the guidance requires

Chapter 5 of the guidelines deals with landscape effects. The subject is the landscape itself: its physical fabric, its character, the aesthetic and perceptual qualities that make it what it is, and any designation attached to it. The question is whether the proposal changes that resource, whether or not anyone is standing there to see it.

Chapter 6 deals with visual effects. The subject is people and what they see. Residents at their windows, walkers on a named footpath, drivers on an approach road, workers in a yard, visitors arriving at a monument.

The two overlap in evidence and diverge in reasoning. A new building can harm landscape character without being visible from any public viewpoint, by removing a hedgerow network or interrupting a pattern of fields. It can also be highly visible from a road without damaging character at all, because the character of that place already includes industrial buildings. Any methodology that cannot express both of those outcomes is the wrong methodology.

Landscape receptors and character

Landscape receptors are identified from the baseline rather than invented for the assessment. In practice they come from three layers.

The published character framework, starting with the National Character Areas and working down through any county or district landscape character assessment, gives the named areas and types. Local designations and valued landscapes add a policy layer. Then the site survey identifies the individual elements and features the proposal physically affects, such as a veteran tree, a stone wall, a watercourse or a historic field boundary.

Record each receptor separately and say what it is. A receptor described as "the surrounding countryside" tells a reader nothing. A receptor described as "the enclosed pastoral farmland of character area 7B, characterised by small irregular fields bounded by thorn hedges with occasional oak standards" can be assessed.

Direct physical effects belong here, and they are the part most often omitted. Loss of 180 m of hedgerow, removal of a copse, regrading of a stream bank, and the introduction of 400 m of new access track are landscape effects whether or not they appear in a single photograph.

Visual receptors and who actually sees the change

Visual receptors are groups of people, grouped by what they are doing when they experience the view. The guidance treats residents at home as having the highest susceptibility, because their enjoyment of a view is part of their enjoyment of the home, and road users on a trunk road as having low susceptibility, because their attention is on the road.

Viewpoints are not receptors. They are tools used to represent the experience of a receptor group, and that distinction is the one that disappears in weak reports. A viewpoint on a lane represents the walkers and drivers who use that lane. The assessment conclusion attaches to those people, not to the camera position. We have set out how the viewpoint schedule itself is built and agreed in viewpoint methodology in a townscape assessment.

Where residential amenity is in issue, a separate residential visual amenity study is often needed in addition, because the threshold at which a view becomes an overbearing living condition is a different question from the significance of a visual effect.

Sensitivity assessed twice, for different receptors

Sensitivity under the third edition is the combination of two things: susceptibility to the particular type of change proposed, and the value attached to the receptor. Both are assessed for landscape receptors and, separately, for visual receptors.

This is where double counting creeps in. A National Landscape designation gives high value to the landscape receptor. It does not automatically give high value to every view from within it, and it certainly does not give high value to a view of a retail park on the edge of the designation. Say which judgement you are making about which receptor and why.

Value needs evidence rather than assertion. Designations, local plan policy, inclusion on a list of protected views, references in historic sources, the presence of interpretation boards or viewing benches, and the volume of recreational use all count. A statement that a view is highly valued, with nothing behind it, invites the response that the consultant valued it because the client needed it valued.

Magnitude of change for each assessment

Magnitude combines size or scale, geographical extent, duration and reversibility, and again it is judged separately in each assessment.

For landscape effects, scale means the degree to which the character changes: complete replacement of the field pattern over three hectares, or the introduction of one vertical element into an otherwise horizontal composition. Extent means how far across the character area the change is felt. Duration and reversibility distinguish a 25 year solar array from a permanent housing estate, and a construction compound from a finished building.

For visual effects, scale means the change in the composition of the view: the proportion of the field of view occupied, whether the development sits on the skyline, whether existing built form surrounds it, and the distance and angle of view. Extent means how many of the receptor group are affected and over what length of a route.

Be explicit about the time slices you are reporting. Construction, year one on completion, and year 15 with planting established are three different answers, and a report that gives only the year 15 figure is making a claim about mitigation that may never be delivered.

Reaching separate conclusions and reporting them together

Run each assessment to its own conclusion, then present them in adjacent chapters with a short synthesis at the end. The synthesis is where you say what the overall effect on the landscape and on visual amenity amounts to, and where the planning balance begins.

What that structure gives a reader is the ability to disagree with one judgement without discarding the whole report. A conservation officer who accepts that character effects are limited but thinks the effect on walkers has been understated can say so precisely. That is what makes a landscape and visual impact assessment useful at committee rather than merely long.

Cumulative effects follow the same discipline. Cumulative landscape effects concern the combined change to character from several schemes. Cumulative visual effects concern what a particular group of people sees from one place, in sequence along a route, or in combination within a single view. Different lists of other developments may be relevant to each.

In towns and cities the same logic applies with townscape substituted for landscape, which is why a townscape and visual impact assessment separates effects on townscape character areas from effects on views and street-level experience.

Where reports collapse the two and why it fails

Five failure patterns I see repeatedly:

1. A single table headed "landscape and visual effects" with one row per viewpoint. There is no landscape assessment at all, only a visual one with a longer title.
2. Landscape character effects judged only where the development is visible, which omits every direct physical effect.
3. Designation value applied to views as well as to the landscape, inflating every judgement inside a National Landscape.
4. One sensitivity rating per receptor with no separation of susceptibility and value, so the reader cannot see which input drove the answer.
5. A conclusion that recites the matrix output without professional judgement. The guidance does not prescribe a matrix, and an assessment that hides behind one has not done the work.

And a procedural point. Where the scheme is environmental impact assessment development, the environmental statement must be prepared by competent experts under the 2017 Regulations, and the landscape chapter is one an authority's advisers will read closely. The baseline is what everything else rests on, which we look at in the baseline section of a landscape and visual impact assessment.

Public bodies also have a duty under section 85 of the Countryside and Rights of Way Act 2000, as amended, in relation to National Landscapes, and an assessment that engages with that duty directly is more useful than one that notes the designation and moves on.

This is general guidance, not legal advice; landscape assessment work needs a qualified landscape professional, and councils expect a suitably qualified author.

You can enter your postcode on PlanScope to see which designations apply to a site before scoping the assessment. PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.