Garden room projects: avoiding disputes over design, defects and delay

The growth of the garden room market reflects changing expectations around how residential space is designed and used. But where design intent, material performance or build quality fall short, these projects can quickly become the subject of dispute. Mustafa Sidki, Construction Litigation Partner with Thackray Williams, examines the common areas of contention and the steps manufacturers and installers can take to protect their position.

Where garden room disputes typically begin

Disputes rarely begin with a single major failing. More often, they stem from a gap between what was expected and what was delivered, whether in relation to design, materials, workmanship, programme or cost. In garden room projects, that disconnect can emerge early, particularly where the original brief is loosely defined, specifications are unclear or responsibilities for design development and installation have not been properly documented.

Problems can also arise where visualisations or marketing claims create expectations that the finished structure does not meet in practice. For manufacturers and installers, the risk is heightened when projects are treated as straightforward turnkey products rather than construction works requiring careful contractual, technical and programme management. Once concerns arise on site, positions can harden quickly, increasing the likelihood of payment disputes, defect allegations and legal claims.

The additional complications of bespoke design

Bespoke garden rooms can complicate the remedies available under the Consumer Rights Act 2015 (‘the Act’). In standard cases, consumers may be entitled to repair, replacement or, in some circumstances, rejection and a refund where a structure is defective, not as described or not fit for purpose.

However, that position is less straightforward where a garden room has been built to a homeowner’s precise requirements or adapted to suit a particular property. If bespoke elements and design changes have been incorporated, a full rejection may not automatically follow, even where there is a dispute. In practice, the more tailored the structure, the harder it may be for the customer to argue that it should simply be removed and refunded in full. That said, relying on this would be a risky strategy for any business and may well lead to time-consuming and expensive legal disputes.

The importance of clear design and product specification

Clear design and product specification are central to reducing the scope for dispute, including detailing scope of works, fixtures and fittings, programme, and the standard to which the garden room is expected to be built. Those express terms matter because they sit alongside the protections implied by the Act.

For manufacturers and installers, the lesson is straightforward: the clearer the quotation, specification and contractual documentation, the easier it is to manage expectations and defend the quality of the finished build.

When defects are genuine – and when they are not

Not every imperfection will amount to a defect giving rise to a legal remedy. Garden rooms are often handmade structures built from natural materials such as timber, which may contain knotting, minor splits or uneven surfaces, and can expand or contract with changes in temperature and humidity. Those issues may be part of the material itself and often fall to be addressed through snagging rather than treated as evidence of defective work.

By contrast, more serious problems — such as unlevel flooring, inadequate foundation slabs, internal ceilings lower than described or walls that are not vertical — are more likely to indicate a genuine failure to meet the required standard. The distinction matters, and much will depend on what was promised contractually and whether the business is given a fair opportunity to put things right.

Delay, access and payment disputes on site

Delays, access problems and payment disputes can quickly turn an already difficult project into a legal one. Businesses have legal rights to be given a reasonable opportunity to remedy alleged faults, including access to the site for this purpose. Where works are halted prematurely over minor or superficial issues — particularly those capable of resolution during snagging — the customer may be in breach. The same can apply where staged payments due under the contract are withheld without proper justification.

Unfortunately, once cooperation breaks down, disputes become significantly harder and more expensive to resolve.

Protecting manufacturers and installers from claims

For manufacturers and installers, the strongest protection lies in clear contracting, careful due diligence and realistic terms. It is essential to confirm that the contract is with the homeowner, rather than a third party with no legal interest in the property, and to ensure that the agreement clearly records key points such as price, scope of works, programme, fixtures and fittings.

Terms and conditions should reflect the practical realities of garden room construction, including the use of natural materials and the distinction between genuine defects and matters that can be resolved through snagging, and set out a realistic process for access, remedial works and payment. Adequate insurance is equally important.

Combined with clear communication from the outset, these steps can significantly reduce the risk of misunderstandings escalating into formal disputes.