Renovation Disputes in London: How They Start and How to Avoid Them

Renovation disputes are expensive, stressful, and disruptive. They also follow predictable patterns. The same kinds of disputes arise on renovation projects year after year — usually from the same causes, and usually in cases where those causes could have been avoided with better preparation.

Here is an honest guide to how renovation disputes start, how contracts prevent them, and what to do if you find yourself in one.

The most common causes of dispute

Ambiguous scope: The most common source of dispute is a contract scope that is unclear. "Renovate the kitchen" is not a contract scope. "Supply and install a new kitchen comprising the items specified in Schedule 1, to the standards set out in Schedule 2, at the contract sum stated" is a contract scope. The difference is that the first leaves enormous room for disagreement about what was included; the second does not.

Ambiguous scope disputes typically manifest as disagreements about whether an item is included in the contract price (contractor says it is a variation; client says it was always included) or about the quality standard required (contractor says the work meets the standard; client says it does not).

Variations: Variations — changes to the scope during construction — are the second largest source of dispute. A client who changes their mind about the kitchen layout after cabinets are ordered generates a variation. A contractor who discovers unexpected conditions and prices the additional work creates a variation. Each variation should be agreed in writing, with a cost and any programme impact, before work proceeds. Variations that are not properly agreed create disputes when the final account is prepared.

Payment timing: Disputes about payment are common where the payment terms were not clearly agreed at the outset. The Housing Grants, Construction and Regeneration Act 1996 (as amended) establishes statutory payment rights in construction contracts — the right to a payment schedule, the right to be paid on time, and the right to suspend work for non-payment. A contract that incorporates these provisions and is followed by both parties prevents payment disputes.

Defects and quality: Disputes about quality — whether finished work meets the required standard — arise where the standard was not defined clearly at the outset, and where the defects liability process was not agreed. A contract with a defined defects liability period, a clear mechanism for raising and resolving defects, and a clear standard of workmanship (typically reference to British Standards and good practice guidance) provides a framework for resolving these disputes.

Delay: Disputes about programme are common where the contract does not include a programme or an agreed completion date, or where there is no agreed mechanism for claiming extension of time when unforeseen events cause delay. A contract with a completion date, a mechanism for extension of time for specific events (including client-caused delays), and a mechanism for paying liquidated damages for contractor-caused delay provides clarity.

What a good contract prevents

A well-drafted contract is not primarily a document for use in court — it is a document that prevents disputes by establishing clear answers to the questions that typically generate them:

• —What is included in the scope?
• —What is the price?
• —When will it be paid?
• —What is the programme?
• —What happens if there are variations?
• —What happens if unforeseen conditions arise?
• —What standard of workmanship is required?
• —What happens if the work does not meet that standard?
• —What happens if the contractor causes delay?
• —What happens if the client causes delay?

A JCT Minor Works Building Contract (or JCT Homeowner Contract for smaller projects) covers all of these points in a form that is balanced between the parties and familiar to lawyers. For a project over £50,000, using a JCT form is strongly recommended.

The contract should be accompanied by: - A specification describing the works in detail - A set of drawings showing what is to be built - A schedule of rates or detailed breakdown of the contract sum - A programme

Red flags before a contract is signed

No written contract: A contractor who is reluctant to sign a formal contract is a contractor who intends to rely on ambiguity. Insist on a written contract.

Lump sum without breakdown: A quoted price with no breakdown makes it impossible to assess what is included and what is not. Require an itemised breakdown before committing.

Large upfront payment: A request for 30–50% upfront payment before any work is done is unusual and should be questioned. Stage payments tied to progress are the norm; large upfront payments expose the client to risk if the contractor fails financially.

Programme not specified: A contract without an agreed completion date or programme is a contract without accountability for delay.

What to do if a dispute arises

Document everything: From the moment a dispute arises, keep records. All communications in writing. Photographs of disputed work. Notes of any meetings with dates and attendees. Without records, disputes become he-said/she-said.

Use the contract's dispute resolution mechanism: Most construction contracts include a dispute resolution procedure — often adjudication (a rapid, relatively cheap process for resolving disputes under the 1996 Act), mediation, or arbitration. Use these before resorting to litigation.

Adjudication: Under the Housing Grants Act, any party to a construction contract has the right to refer a dispute to adjudication at any time. An adjudicator is appointed (typically within 7 days) and makes a decision within 28 days. The decision is temporarily binding — it can be challenged later in arbitration or litigation, but it must be complied with in the interim. Adjudication is faster and cheaper than litigation and is the standard dispute resolution route for construction disputes in the UK.

Mediation: A consensual process in which both parties agree to meet with a neutral mediator to try to reach a settlement. Successful in approximately 70–80% of cases where it is used. Costs are shared.

Litigation: County Court or Technology and Construction Court (TCC) litigation is available for construction disputes. The TCC is a specialist court with experience in construction matters. Litigation is expensive and slow — typical TCC cases take 12–18 months to trial. It should be a last resort.

ASAAN's approach

ASAAN uses JCT contracts on all significant projects. We provide a detailed specification and drawings as part of the contract, maintain a variation log throughout the project, and agree all variations in writing before proceeding. We have not had a formal dispute with a client in our recent project history.

If you are evaluating contractors and want to understand what a well-structured contract looks like, contact us to discuss our standard contract approach.