Solar Contracts and the Defects Liability Period (DLP) in Singapore

The Defects Liability Period (DLP) is the window in your solar contract, typically around 12 months from completion, during which the installer is contractually obligated to fix defects in their own work at no additional cost. It is a standard construction industry term applied to solar installation contracts, and it is genuinely worth understanding precisely, since it covers something entirely different from your equipment warranties.

What does DLP actually cover?

Installation workmanship: how correctly panels were mounted, wiring was run and terminated, and the roof was sealed around mounting penetrations. A DLP claim is genuinely the right avenue for any issue directly traceable to how the system was actually installed, a leak from a poorly flashed mounting bracket, a wiring fault, or a mounting bracket that has come loose, not a manufacturing defect in the panels or inverter themselves.

How is this different from your equipment warranties?

DLP is issued by the installer and covers their own workmanship for a relatively short period. Panel and inverter warranties are issued by the manufacturer and cover equipment failure over a far longer period, typically 25 years for panel output and 10 to 12 years for the inverter. These are genuinely two entirely separate protections, covering different failure modes, from two entirely different parties.

What does a real DLP claim actually look like in practice?

Take a genuine, common scenario: six months after commissioning, a homeowner notices a small water stain forming on the ceiling directly beneath one of the roof penetration points where a mounting bracket was fitted. If the flashing or sealant around that penetration was not installed correctly, that is a textbook DLP issue, a workmanship defect covered by the installer's own obligation, not a manufacturer warranty matter since neither the panel nor the inverter is at fault.

The homeowner's actual next step is straightforward: document the issue with photos and a written description, notify the installer in writing referencing the contract's DLP clause, and request a specific timeline for inspection and repair. An installer with a genuine, functioning DLP process handles this routinely; a request that goes unanswered or gets pushed back with excuses is exactly the situation where CASE or, if needed, the Small Claims Tribunals become the practical next step rather than an abstract legal concept.

What should you confirm about DLP before signing?

The exact length stated in the contract, what it explicitly covers, and the process for making a claim during that period. A contract that omits DLP terms entirely, or states them vaguely without a specific duration, is worth raising directly with the installer before signing, since this is genuinely the kind of term that ends up mattering most, once something on the roof has already gone wrong.

What actual recourse exists if an installer refuses a valid DLP claim?

A few escalating options, worth knowing before assuming a refusal is the end of the conversation. CASE, the Consumers Association of Singapore, mediates consumer disputes and is a reasonable first step for a documented, unresolved DLP disagreement. If mediation does not resolve it and the claim amount fits within the relevant threshold, the State Courts' Small Claims Tribunals offer a genuinely accessible, relatively low-cost legal avenue for a homeowner without needing to hire a lawyer, specifically designed for exactly this kind of contract dispute between a consumer and a business.

Does the DLP length itself vary between installers, or is 12 months essentially universal?

It can vary, and treating 12 months as an unquestionable industry standard misses a genuinely useful comparison point between quotes. Some installers offer a longer DLP as a real point of differentiation, precisely because it signals confidence in their own workmanship, while others default to the shorter end of what is typical. Asking directly what DLP length a specific quote includes, and whether it is negotiable, is a reasonable question that a confident installer answers without resistance.

Does DLP protect you if the installer closes down?

Not in the same way manufacturer warranties do. A DLP obligation is tied to the installer as a company, so if they stop trading during the DLP period, that specific protection is at risk, unlike panel and inverter warranties which generally continue with the manufacturer regardless of the installer's status. This is one more reason installer track record and financial stability matter when choosing who to sign with.

Further reading: see the solar buyer's checklist for the full pre-signing checklist including DLP, what happens if your installer closes down for what actually survives, and making a warranty claim that actually succeeds for the equipment-manufacturer side of a claim, separate from DLP. Run the Sunnify solar estimate to start comparing quotes properly, contract terms included, not price alone.