The defence is the record,
not the relationship.

A residential builder's warranty exposure does not end at handover. The statutory warranties implied into every domestic building contract run for years afterwards, they generally cannot be contracted out of, and they attach to the work rather than to the friendship. Which means the realistic scenario a builder should plan for is not a difficult client. It is a letter about a house finished several years ago, describing a defect in work that was covered by other work within days of being done, sent by someone with no memory of the build.

Two facts make that scenario harder than it first sounds. Warranty protection commonly transfers with the home, so the claimant may be a subsequent owner the builder has never met, who knows nothing of what was agreed, changed or deliberately excluded. And the work in question is usually invisible: reinforcement, membranes, flashings, framing, services, all sealed behind finishes long ago. Nobody can go and look. The dispute is decided on what was written down at the time, or on whose account is more persuasive when nothing was.

The principle

The defence is the record, not charm and not the relationship. That is not a comment on goodwill, which is worth having and often resolves things before they become claims. It is a comment on durability. Goodwill does not survive a sale of the house, a change of supervisor, a company restructure or five years. A written record does, if somebody decided to keep it in a form that can be found. This page is about that decision.

Everything here is general information about record-keeping practice, not legal or insurance advice. Retention periods, warranty periods and the way a claim is assessed differ by jurisdiction and change, so confirm the current position for the state you build in, and take advice on any actual claim.

This page is not about daily site record-keeping, which has its own reference in site diaries and daily records. The two are related and worth keeping distinct, because they have different purposes and different lifespans.

• The site diary is an operational record with live uses. Weather, labour, deliveries, directions, delays and progress, written on the day, mostly used while the job is running to justify an extension of time, support a variation, or settle a disruption argument. Its horizon is the build and the period immediately after it.
• The warranty file is a curated permanent record. What was approved, specified, built, inspected, certified and handed over, kept because a claim may arrive years later. Its horizon is the statutory warranty period, which outlasts the site by years and often outlasts the staff who were on it.

The diary feeds the file, particularly through its dated photographs and its record of directions and decisions, and a builder who keeps a good diary has already done a meaningful part of the work. But a diary is not a warranty defence on its own, because a diary rarely holds the approvals, the compliance certificates, the engineering details as built or the handover pack. Read the diary page for the daily discipline; read this one for what is kept, and for how long.

The retention horizon for building records is set by the statutory warranty exposure, not by the period a business keeps records for tax. Those two clocks are different, they are set by different bodies for different reasons, and the building one is usually the longer of the two. A builder who lets the accountant's calendar decide when a job file is destroyed has aligned their evidence with the wrong risk.

Setting the horizon is a three-part calculation, and each part has to come from the jurisdiction rather than from a national rule.

• The longest warranty period that could apply. Statutory warranty periods are set by each state and territory and commonly split a longer period for major or structural defects from a shorter one for other defects. The file has to survive the longer of them. As an illustration of the shape rather than a national figure, Tasmanian statutory warranties run six years from practical completion and transfer to a new owner if the home is sold within that period. Confirm the periods that apply where you build.
• When the clock starts. A period running from practical completion and a period running from some earlier date are not the same amount of exposure, and the difference can be months on a long job. Read the start point, not just the length.
• The time a claim takes to run. A claim made near the end of a warranty period is not resolved on the day it is made. Records destroyed the week a period expires can still be the records a live matter needs, so the sensible practice is to keep the file past the end of the period rather than to the edge of it.

One practical consequence: retention is a per-job decision, because the horizon runs from that job's completion in that job's jurisdiction. A business that archives by financial year is making a single decision for jobs whose clocks started at different times, which is how a file gets destroyed two years early without anyone deciding to destroy it.

None of the above is a legal retention rule. Record-keeping obligations under building, licensing, work health and safety, employment and tax law all run in parallel and are set elsewhere. Treat the warranty horizon as a floor for keeping building records, confirm the statutory periods for your jurisdiction, and take advice if you are deciding to destroy anything.

The central idea on this page is that a record made at the time and a record assembled afterwards are different classes of thing, even when both are honest. The record made at the time was created by someone who did not know what would later be argued about, for no purpose beyond documenting the day. That absence of motive is exactly what gives it weight. The reconstruction is made by someone who knows the allegation, and everyone assessing it knows that.

The second difference is accuracy rather than motive. Memory does not simply fade, it fills. Asked years later what happened at a pre-pour, an honest supervisor will describe what normally happens, because that is what the mind supplies when the specific day is gone. The answer will be sincere and it will be a description of practice, not of that slab. A photograph timestamped that morning is a description of that slab.

This is why the practical advice is always about the moment of creation rather than the moment of need. You cannot decide to have evidence when the claim arrives. The only decision available then is which of your existing records to send. Every meaningful choice about a warranty defence was made years earlier, on ordinary days, by someone taking a photograph before the plasterer arrived.

The operator's observation is that most builders lose warranty claims to a filing decision rather than a building one. The records usually existed. The photographs were taken, the certificates arrived, the variation was discussed. What went wrong is that the photographs stayed on a phone that left with a supervisor, the certificate was an attachment in an email account nobody searches, and the variation was agreed over a bonnet. Nothing was destroyed. It simply could not be found by the person who needed it, four years later, in the fortnight they had to respond.

The second observation is the retention mismatch. Builders inherit their filing rhythm from the accounts side of the business, because that is the part with an external deadline every year, and building records quietly get treated the same way. But the accounts calendar has nothing to do with warranty exposure. Records get cleared out on a schedule set for a different purpose, and the gap between the two clocks is where a surprising number of claims are lost.

The disciplines that answer both observations are unremarkable. Variations documented and signed before anything is ordered, so the scope of record is never a matter of recollection. A written scope the client has actually agreed to. Photographs at every point where work disappears behind other work, filed against the job the same day rather than kept on a handset. Certificates and approvals filed against the job as they arrive, not at the end. Subcontractor details and their warranties held with the job so the recovery path still exists years later. And a handover pack with a signed acknowledgement, so what the owner was told about maintaining the home is a record rather than a claim.

None of that is warranty-specific work. It is how a well-run job is documented anyway, which is the useful part: the builder who runs this way is not preparing for a claim, they are simply operating in a way that happens to answer one. That also means no regulatory change makes the discipline newly necessary. Reform raises the cost of not having the record; it does not create the need for it.

Where software fits the workflow

The record only exists years later if creating and filing it was easier than skipping it, which is a workflow problem before it is a compliance one. In VIABUILD, variations are captured and approved before work starts, site photographs and daily records are filed against the job as they are taken, and the documents that arrive during a build, approvals, certificates, specifications, subcontractor paperwork, are held against the job rather than in an inbox. Oryn reads those documents so they are searchable by what is in them rather than by what somebody named the file, which is the difference between having a record and being able to produce it. The judgement about how to answer a claim stays with the builder; the contribution is that the file the answer stands on was assembled while the job was running.

Illustrative only, not a benchmark. Water appears in a ground floor ceiling below an upstairs bathroom. The home has been sold once, so the claimant is an owner the builder has never met, and the allegation is that the waterproofing was never done properly.

The first builder pulls the job file. It holds the waterproofing compliance certificate naming the licensed applicator and the date, photographs of the membrane taken the morning before the screed showing the upturns and the penetrations, the product data sheet for the specified membrane, the subcontractor's details and warranty, and a signed variation from the build recording that the owner changed the shower layout after the set-out. The response goes back with all of it attached and a proposal to investigate the actual source, which turns out to be a failed shower screen seal, a maintenance item covered in the handover pack the original owner signed for. The matter is closed in a fortnight without anyone becoming adversarial.

The second builder is confident the waterproofing was done correctly, because it always is. The certificate is in an email account, the applicator has since closed their business, the photographs were on the phone of a supervisor who left, and the shower layout change was agreed on site and never written down. There is nothing to attach to the response, so the response is an assertion. The next step is an inspection, and because the evidence has to be found rather than produced, the inspection is invasive: tiles come off. Whatever the outcome, the cost of establishing it is now real, and the builder is arguing about a job they built well.

Same standard of work, same builder capability, opposite experiences. The difference was settled five years earlier, in the ten minutes it took to photograph a membrane and file two certificates against a job.

Contemporaneous record (evidence created at the time of the event rather than reconstructed later), covered work (work sealed behind later work and no longer inspectable without destruction), as-built documentation (the record of what was actually constructed, including changes to design details), compliance certificate (a licensed person's certification that specific work meets the applicable requirement), handover pack (the documentation and maintenance information given to the owner at completion), retention horizon (how long records are kept, set here by the statutory warranty exposure), subsequent owner (a later purchaser who may hold warranty protection transferred with the home). The wider vocabulary lives in the construction glossary.

The related reads are statutory warranties for what is actually being promised and for how long, first-resort and last-resort warranty models for who can enforce it and how early, and defects management for handling a claim once it has arrived.

• Your state or territory's building regulator and domestic building legislation, for the statutory warranty periods that set the retention horizon, and for any record-keeping obligations attached to your licence.
• The warranty scheme administrator in the jurisdiction where you build, for how a claim is made and assessed and what evidence is expected from a builder.
• A construction lawyer, for any live claim. General information about record-keeping cannot tell you how to respond to a specific allegation.