Developer Warranty After Property Handover in Thailand

The awkward defects are often the ones that were invisible on handover day. A window can look perfectly fine in dry weather and leak during the first heavy storm; an air-conditioning drain may fail only after regular use; a hairline crack may become obvious once finishes have settled. Discovery after the keys were delivered does not, by itself, decide whether the developer is responsible.

The useful starting point is the paperwork for the actual unit: the sale agreement, specifications and schedules, the handover record, written warranty terms and any earlier defect list. Keep the sales material too if it described finishes, equipment or features that were part of the purchase decision. OCPB guidance treats project representations and dated evidence as potentially relevant, but a brochure is evidence of what was represented, not a shortcut to proving every later claim.

There is also a formal consumer-contract layer for condominium sales by business operators. OCPB's current legal library still lists the 2000 Contract Committee notification that designates condominium sales as a contract-controlled business. Its defect clause provides a minimum five-year responsibility period for structural elements and equipment forming part of the building as immovable property, and at least two years for other components, with the notification measuring those periods from condominium registration. That is why owners should be wary of a simple slogan such as “five years from handover”: the transaction must fall within the rule, the building's registration date matters, the defect has to be classified correctly, and the signed contract may give the buyer more favourable protection.

Coverage also depends on what actually failed. A concealed construction defect is different from wear, tenant damage, blocked drains caused by use, or routine servicing. Some installed equipment may have a manufacturer warranty or separate service terms, but that does not automatically replace any responsibility the developer has under the sale contract or applicable consumer rules.

A significant structural issue or a high-value dispute should be assessed against the actual Thai documents, not a generic online warranty summary. The practical question is which obligation applies to this unit, this defect and this date — and what evidence links them together.

A wet patch on your wall tells you where the damage became visible, not necessarily who owns the failed component. Water can travel from the façade, roof, an exterior joint, a shared riser or the unit above before it appears inside your apartment. Assigning blame too early often produces several defensive replies and very little diagnosis.

Condominiums have a separate management entity responsible for common property. Thailand's Department of Lands has reiterated in 2026 that the condominium juristic person exists to manage and maintain those common parts. That makes source tracing more important than the side of the wall on which the stain appears. When the source is uncertain, a joint inspection involving the developer's team and building management is usually more useful than two separate conversations.

Consider five common situations. Water around a window may point to the frame installation or the external façade. A leaking trap or fitting serving only the unit may be an internal plumbing issue. A shared pipe or riser brings common property into the picture. A recurring air-conditioning problem could come from installation, failed equipment or neglected servicing. And an unexplained crack should not be labelled cosmetic or structural from a photo alone; the relevant element needs to be identified first.

More than one party may ultimately be involved. The developer, condominium management and a specialist contractor can all appear in the same case without having the same legal responsibility. For the owner, one chronological record is more valuable than trying to manage each party's internal process: date of discovery, messages sent, inspection visits, findings, work promised and what happened next.

This matters even more for an overseas owner. A property manager can provide access and coordinate appointments, but the evidence file and written case history should remain under the owner's control. Otherwise a staff change at the building can erase the practical history of the defect.

Evidence can disappear in a single maintenance visit. Once a contractor opens a ceiling, replaces sealant or paints over a damp patch, the owner may be left with no clear record of where the problem started or how extensive it was. A repair can be necessary and still make the later responsibility question harder to prove.

Useful documentation is simple. Take a wide shot that shows the defect's location in the room, then close images of the damage itself. Video is better when the issue involves dripping, intermittent noise, an air-conditioning cycle or water movement. Record the unit number, the exact location and when the problem was first noticed, then note the condition that triggers it — heavy rain, use of a shower, operation of a system, or no obvious trigger at all.

The paperwork should sit beside the images, not in a separate forgotten folder. Keep the sale agreement, specification, handover record, earlier defect sheet, emails or building-service tickets, and a log of technician visits. If the same leak returns, a sequence showing the condition before repair, immediately after the work and after recurrence is far more persuasive than a single undated image.

Safety takes priority over preserving a perfect file. Active water near electrical equipment, a major uncontrolled leak, burning smells or a potentially structural issue call for immediate risk control and a competent specialist. Owners should not open walls, dismantle electrical systems or carry out invasive testing simply to discover the cause themselves.

Where emergency work cannot wait, document what can be documented safely and record why the intervention was urgent. Photographs of removed parts, the contractor's scope, invoices and a short written description of the work can preserve the chain of events after the original condition has changed.

A message saying “the window leaks, please send someone” may get a technician through the door, but it creates a weak record. A month later a different employee may have no idea when the problem was first reported, which images were sent or what the previous technician promised. The claim becomes much easier to manage once it has a written case trail that does not depend on one staff member's memory.

A formal notice does not need to sound legalistic. Identify the owner and unit, state when the defect was discovered, describe its location and symptoms, and separate multiple defects into numbered items. Attach the relevant images and, where useful, point to the specification, handover record, warranty term or earlier defect sheet. The aim is to connect the physical problem to the documents without burying the recipient in a long argument.

Ask for acknowledgement and a case or ticket number, then for an inspection date. After the inspection, the useful record is not merely “we will fix it” but what the team believes the cause to be, what work is planned and how completion will be checked. If most of the discussion happens by phone or messaging app, a short written recap can preserve the agreement.

For condominium sales that fall within the 2000 OCPB Contract Committee notification, the text itself requires written notice of a covered defect and provides a 30-day repair period, with urgent defects to be handled immediately. That should not be copied into every property dispute as a universal deadline; applicability depends on the transaction and the governing documents, and a contract can provide the consumer with more favourable terms.

An initial defect notice is usually stronger when it stays technical. If the cause is still unknown, request an inspection and a written repair plan before escalating the language. Formal consumer or legal escalation becomes more relevant once the developer fails to respond, rejects responsibility or the same defect returns after work has supposedly been completed.

A contractor's visit is an event in the file, not proof that the defect has been solved. If the same corner becomes wet after every heavy storm, fresh sealant and paint may remove the visible stain while leaving the water path untouched. Before work starts, the owner should understand what is being repaired and what observation will show that the underlying problem is gone.

Reinspection works best when it recreates the condition that exposed the defect. A façade or window leak may need to be checked after heavy rain or a controlled water test by the appropriate professionals. An air-conditioning leak should be observed under the operating conditions that caused it. A plumbing repair should be tested at the relevant connection. When the problem is seasonal or intermittent, a dry surface immediately after the repair is not enough reason to close the case.

If the defect returns, connect the new record to the earlier ticket and repair date. That turns a vague complaint into a history of recurrence. Where the developer stops responding or rejects responsibility, the next step is a written follow-up carrying the earlier record, followed where necessary by an independent engineer or other specialist who can identify the cause without relying on either party's assumptions.

OCPB is an official consumer complaint and mediation channel. Its guidance emphasises keeping the contract, payment records and communications so the dispute can be assessed, but filing a complaint does not guarantee a repair or a particular compensation outcome. If the suspected source is common property, keep a parallel written record with the condominium juristic person because the common-property issue may follow a different responsibility path.

Emergency repairs by a third party require particular care. Payment of an invoice does not automatically create a reimbursement right, although the 2000 controlled-contract notification does provide a route for the consumer or condominium juristic person to arrange repairs at the developer's cost after the developer fails to perform the applicable repair obligation. Preserve notice, urgency, quotations, invoices and the technical reason for the work. For substantial losses or a suspected structural defect, independent engineering and Thai legal advice can help keep the diagnosis and the legal claim grounded in the same facts.