Landscape architect competence for a GLVIA3 assessment

The Guidelines for Landscape and Visual Impact Assessment, third edition, do not name a qualification, and no statute reserves landscape assessment to any register. What GLVIA3 does is set out a method that depends almost entirely on the judgement of the person applying it, which is why the question of who signs the assessment matters more here than in most technical disciplines. A GLVIA3 assessment author who cannot show relevant experience of the landscape type in question is the weak point an objector will aim at.

For a farm diversification scheme or a house in open countryside, that weak point can decide the application.

What the guidelines actually ask of the assessor

GLVIA3 was published by the Landscape Institute and the Institute of Environmental Management and Assessment. It separates landscape effects, meaning changes to the fabric and character of the landscape itself, from visual effects, meaning changes to views and to the experience of people who see them.

The method runs on structured professional judgement rather than on a formula. Sensitivity, magnitude and significance are reasoned, not calculated, and the guidelines are explicit that the reasoning must be transparent and proportionate to the scale of the proposal.

That has two consequences for competence. The assessor has to understand landscape character assessment, published character areas and the designation policy that applies, because those set the baseline. And the assessor has to be willing to record adverse effects honestly, because an assessment that finds no meaningful harm from a large building in a sensitive valley tells a case officer only that the author is unreliable.

Proportionality matters as much as thoroughness. A single dwelling replacing a barn does not need the apparatus of a wind farm assessment, and producing one signals inexperience just as clearly as producing too little.

Chartered membership and what it signals

The Landscape Institute is the chartered body for the profession in the United Kingdom, and chartered membership is shown by the post-nominal CMLI, with fellows using FLI. Chartered status follows an accredited or approved qualification, a period of recorded professional experience and a professional practice examination, and it carries a code of conduct and a complaints route.

Landscape architect is not a protected title in law. Anyone may use it. Chartered membership is therefore the practical shorthand councils and inspectors use for competence, in the same way that they read chartered status in other disciplines.

It is not the whole answer. A chartered landscape architect whose work has all been in urban streets and squares is not obviously the right author for an assessment in a National Landscape, and an experienced landscape planner working towards chartership under supervision may produce better evidence. Ask what comparable assessments the individual has produced, in what landscape character types, and whether any of them have been tested at appeal.

A Landscape and Visual Impact Assessment is one of the report types where councils expect a suitably qualified author, and professional review of any draft is strongly advised before it goes near a validation officer.

Visualisations and the standards behind them

Most disputes about landscape evidence turn out to be disputes about the photographs. A wide-angle image taken on a phone flattens a hillside and shrinks a proposed building, and an inspector who visits the viewpoint will notice.

The Landscape Institute publishes technical guidance on the visual representation of development proposals, and it sets out the camera and lens conventions, the field of view for different types of visualisation, the printing size and viewing distance, and the level of accuracy expected for wireframes and photomontages. Assessment work that follows it is far harder to attack.

Practical points that come up repeatedly:

• Record the camera position by satellite positioning, the date, the time and the direction of view for every viewpoint
• Take photographs in conditions that show the site fairly, which usually means good visibility and, for deciduous screening, both summer and winter
• State clearly whether a visualisation is indicative or verified, because a verified view carries a survey-controlled accuracy claim
• Show the proposal at the height and position on the approved drawings, not a simplified block

Winter photography is the item most often missed. Where a scheme relies on existing hedgerow or tree screening, an assessment illustrated only in July overstates the mitigation, and a case officer who visits in February will say so.

Agreeing viewpoints before the work starts

Viewpoint selection is where an assessment is won or lost, and it is the one part of the process a council will engage with before submission.

Write to the case officer and the landscape officer with a plan showing a zone of theoretical visibility, a proposed list of viewpoints, and a short note on why each was chosen. Include the ones that are unflattering. Ask the authority to confirm the list or add to it, and keep the correspondence.

Doing this at pre-application stage costs a fraction of what it costs to repeat a photography exercise in a different season because the officer wanted three viewpoints you left out. It also removes the most common objection to landscape evidence, which is that the assessor chose only the views that suited the applicant.

Where a public right of way crosses the site, or a designated landscape lies within the visual envelope, treat those receptors as required rather than optional.

Reading an assessment critically

You do not need to be a landscape architect to interrogate one. Work through it in this order.

1. Check the baseline: does it use the published national and local landscape character assessment, and does it describe the site as it actually is rather than as a generic rural setting?
2. Check the receptors: are residents, walkers, road users and users of designated landscapes all identified, and has anyone obvious been omitted?
3. Check the reasoning: for each effect, can you follow the argument from sensitivity and magnitude to the conclusion, and would a reasonable person reach the same view?
4. Check the residual effects: are effects reported at year one as well as after mitigation has matured, because planting takes fifteen years to do what the drawings imply?
5. Check the conclusions against the images: if the text says minor adverse and the photomontage shows a building dominating the skyline, the text is wrong.

The last one catches more problems than anything else.

When to bring the assessor in

Appoint the assessor before the siting is fixed. The value of landscape input is in choosing where the building goes, how it sits in the land form, what it is made of and how the boundary planting works, and none of that can be retrofitted once a design has been drawn to suit a client's view of the plot.

On a rural scheme, a sensible sequence is a landscape appraisal at option stage, then siting and design informed by it, then the formal assessment for submission, with a Landscape Strategy covering planting, boundary treatment and long-term management. If you need a reviewer for a draft, the professional directory is the route to someone who can check and sign off the work.

PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval. For specialist technical reports, qualified professional input may be required.

This is general guidance, not legal advice. Check the position with your local planning authority or a qualified professional before relying on it. Enter your postcode on PlanScope to see which reports your site is likely to need.