When a landscaping dispute reaches court, the appointment of the right expert can have a major influence on how the case is understood. That may sound obvious, but in practice the discipline of the expert does not always match the technical issues that need to be considered.
It is common for parties, solicitors or the court to think first of a building surveyor or building consultant when a construction-related dispute arises. In many cases, that will be entirely appropriate. Building surveyors provide valuable expertise in relation to buildings, building fabric, structural issues, damp, defects and general construction pathology.
However, landscaping is not always a building dispute, even when the works are expensive, technical and construction based.
A modern garden project can involve paving, decking, lawns, planting, irrigation, drainage, retaining features, lighting, steps, levels, soil preparation, specification decisions and wider external works. These are not simply decorative additions to a property. They are often designed, specified and constructed systems which require specialist landscape knowledge.
That is why the correct expert discipline matters.
This is not a criticism of judges, solicitors or building surveyors
This article is not intended as criticism of judges, solicitors, insurers, parties or building surveyors. Each has an important role, and each is usually trying to move a dispute forward in a fair and practical way.
Judges must manage cases efficiently and proportionately. Solicitors must advise their clients, comply with directions and help the court obtain the evidence it needs. Building surveyors and building consultants often provide excellent expert evidence where the dispute sits within their proper area of expertise.
The issue is not whether building surveyors are competent professionals. Clearly, many are.
The issue is whether they are always the right professionals for landscaping disputes.
A simple comparison may help. One would not usually appoint a landscape consultant to give expert evidence on a complex house-build dispute involving roof construction, cavity wall defects, damp ingress or general building pathology. A landscape consultant may understand external works, garden levels and site construction, but that would not make them the correct expert for a house-build dispute.
The same principle should apply in reverse. Where the central issues concern landscaping, the court should usually receive evidence from someone with proper landscape expertise.
Landscaping is a specialist technical discipline
There remains a tendency to think of landscaping as a visual or finishing trade, but that view no longer reflects the reality of many garden and external works projects.
A domestic landscaping project can easily cost £30,000, £60,000, £100,000 or much more. We have experience of domestic projects claiming over £1,500,000.00. Commercial external works can be considerably larger. These projects may involve significant design, technical specification, material selection, construction sequencing and long-term performance considerations.
In practice, a landscaping dispute may involve porcelain paving failures, incorrect sub-base construction, poor falls, inadequate drainage, defective decking structures, unsuitable timber treatment, poor soil preparation, failed lawns, inappropriate planting, irrigation defects, retaining elements, unsafe steps, poor material specification, unfinished works or disputed valuations.
Those issues are not minor aesthetic disagreements. They can affect safety, durability, usability, cost and the value of the completed works.
Where those matters sit at the centre of a dispute, the expert needs to understand landscaping as a specialist field. They need to understand how external works are designed, built, specified, maintained and expected to perform in real site conditions.
Decking is a good example of the problem
Decking illustrates the point well because it is often misunderstood as a surface product rather than a complete external structure.
A dispute may begin with a complaint that boards have moved, lifted, warped, worn, become slippery or failed prematurely. At first glance, that may appear to be a straightforward product or workmanship issue. However, the visible board is only one part of the deck.
A proper assessment may need to consider the subframe, joist spans, joist centres, fixings, ventilation, drainage, material movement, edge detailing, steps, guarding, manufacturer guidance, workmanship and maintenance. The expert may also need to understand the differences between timber, composite, mineral-based composite, aluminium subframes and recycled plastic systems.
A general building expert may understand broad construction principles, but that does not automatically make them a decking specialist. If the expert does not understand the deck as a complete external system, the report may focus on the wrong issue or miss the real cause of failure.
That can have serious consequences for both parties.
A contractor may face criticism based on incomplete technical reasoning. A homeowner may receive poor advice about the real cause of the defect. Solicitors may then find themselves trying to settle or litigate a case on evidence that does not fully address the technical issues.
Paving disputes also need landscape expertise
The same applies to paving.
A patio dispute may involve loose slabs, cracked grout, open joints, ponding water, staining, poor falls or localised settlement. These symptoms may be visible at surface level, but the cause often sits below the paving.
A proper assessment may need to consider excavation depth, sub-base construction, compaction, bedding method, falls, drainage, edge restraint, priming, slab type, jointing compound, workmanship and relevant industry guidance.
It is rarely enough to look at the finished surface and describe the visible defect. The expert must consider why the defect occurred and whether it arose from workmanship, specification, materials, site conditions, maintenance or some combination of these factors.
That requires more than a general understanding of construction. It requires practical and technical knowledge of landscape construction.
Soft landscaping is not simple either
Some disputes involve soft landscaping rather than hard construction, and these cases can be just as technical.
Failed lawns, dead planting, poor soil, unsuitable tree selection, irrigation problems and poor establishment are not always straightforward. A plant may fail because of poor species selection, incorrect planting depth, poor soil structure, waterlogging, drought stress, compaction, inadequate aftercare or an irrigation system that never gave the planting a fair chance.
A lawn may fail because of shade, poor preparation, unsuitable soil, insufficient drainage, poor seed or turf choice, compaction, irrigation issues or unrealistic expectations for the site.
These are horticultural and landscape matters. They need an expert who understands gardens as living systems, not just as constructed spaces.
The wrong expert can create unfair pressure
Expert evidence can carry significant weight. It can influence legal advice, settlement discussions, case strategy and the court’s understanding of the dispute.
That is why expert selection is so important.
If the wrong discipline inspects the works, the report may still appear professional and authoritative. However, it may not answer the right technical questions. It may also miss issues that a landscape specialist would consider obvious.
This does not mean the appointed expert has acted improperly. In many cases, the expert may have done their best within the limits of their own professional background. The real problem may be that the instruction was directed to the wrong discipline in the first place.
That is an avoidable problem.
The court deserves clear, relevant and properly focused expert evidence. So do contractors, homeowners, insurers and solicitors.
Solicitors should start with the true issue in dispute
Before an expert is appointed, the parties should identify the true technical centre of the dispute.
Is the dispute mainly about building fabric, structural movement, damp, roofs, walls or internal construction? If so, a building surveyor may be the correct expert.
However, if the dispute concerns paving, decking, lawns, planting, irrigation, garden drainage, retaining features, levels, external steps or wider landscape construction, then a landscape consultant may be the more appropriate expert.
Some cases may need more than one discipline. That should not be seen as a weakness in the case. It may simply reflect the fact that the dispute crosses professional boundaries.
A case involving a raised terrace attached to a house may require both building and landscape expertise. A dispute involving drainage near a dwelling may need careful thought about where the building issue ends and the landscape issue begins. In those situations, the right answer may not be one expert or the other, but a properly considered appointment that matches the issues.
A practical example
Consider a substantial decking project with a contract value of around £60,000.
If a dispute arises, the court may need evidence on board performance, fixing method, frame construction, product selection, tolerances, ventilation, drainage, spans, movement and manufacturer guidance. The issue may not be whether the deck looks right on the day of inspection. The real question may be whether the deck was designed and constructed as a durable external structure.
A building surveyor may be well qualified in general building matters, but a decking specialist may be better placed to understand the technical behaviour of the system. They may also be more familiar with manufacturer requirements, modern composite boards, timber treatment, plastic subframes, aluminium systems, ventilation requirements and common installation failures.
That distinction matters because the expert’s opinion can shape the whole direction of the case.
This is about better expert evidence, not professional territory
This issue should not become a territorial argument between professions.
The point is not that landscape consultants should replace building surveyors. The point is that each dispute should have the right expert for the issues in question.
Where the dispute concerns a building, appoint a building expert. Where the dispute concerns landscaping, appoint a landscape expert. Where the dispute crosses both disciplines, consider whether more than one area of expertise is required.
That approach helps the court. It also helps the parties, because it reduces the risk of a dispute being driven by evidence that does not properly address the technical issues.
In my view, this sits comfortably with the purpose of expert evidence. The expert is there to assist the court, not to act as an advocate for either party. However, they can only assist properly if their expertise matches the questions they have been asked to answer.
Better guidance would help solicitors and parties
Many solicitors will not deal with landscaping disputes every week. That is entirely understandable.
Landscaping sits across construction, horticulture, design, drainage, external works and practical site delivery. Because of that, it can look simpler than it really is. A garden may be seen as something outside the main building, when in reality it may involve complex technical decisions and significant financial value.
Clearer guidance would help.
Expert directories, legal publications, professional bodies and online resources all have a part to play. The aim should be to help lawyers, judges, insurers and parties identify the most suitable expert discipline at an early stage.
The key point is straightforward. Do not start with the broadest available category. Start with the actual technical issue. Then appoint the expert whose knowledge best fits that issue.
What should a landscaping expert witness understand?
A suitable landscaping expert witness should understand more than garden appearance.
They should understand how landscape works are designed, specified, built and maintained. They should also be able to distinguish between poor workmanship, poor specification, product limitation, client expectation, maintenance failure, site conditions and ordinary deterioration.
That distinction is often central to landscaping disputes.
For example, a failed lawn may not prove poor workmanship if the aftercare was absent. A cracked patio joint may not prove defective workmanship if movement occurred elsewhere in the construction. A defective deck board may not prove a defective deck frame. Equally, a manufacturer’s product issue should not be mistaken for an installer’s error.
These distinctions require careful technical reasoning. They also require practical experience of landscaping works in real site conditions.
Final thought
A good expert appointment should not begin with a job title. It should begin with the question the court needs answered.
If the dispute concerns the building, the court needs building expertise. If the dispute concerns the garden, the court needs landscape expertise.
Where the issues involve decking, paving, planting, irrigation, lawns, drainage, levels, steps or external landscape construction, a landscape consultant may provide the most relevant opinion.
That is not controversial, and it should not be seen as criticism of any other profession. It is simply the proper selection of expertise.
In landscaping disputes, the right expert helps the court reach the right technical understanding. That benefits everyone involved.
