Construction photo evidence: proving every stage of a house build
How do you get construction photo evidence that holds up when a client disputes a stage, a subcontractor denies damage or a snag drags on? On a new-build house, a builder often pays for lack of proof, not for lack of good work. The client blocks the payment due when the house is watertight. The tiler scratches plasterboard fitted the day before. Handing over the keys opens an eight-day window for complaints. Each time, whoever can show a dated, located image wins the argument.
Key takeaways in 30 seconds
- An ordinary photo proves neither its date nor its location: a client, a bank or an expert can always question it.
- Under a French house-building contract (CCMI), the builder is paid stage by stage and when snags are cleared: every unproven stage delays a payment.
- Certificall produces construction photos with a qualified timestamp under the eIDAS regulation, a verified location and a qualified electronic seal. More than 400 building companies use it.
- Certificall does not replace the judicial officer: it covers every stage where nobody calls one in.
Construction photo evidence: why a WhatsApp photo is not enough
Construction photo evidence is a site photo whose date, location and integrity can be proven to a third party who challenges it.
A photo taken on a phone and sent over WhatsApp meets none of these conditions. Its date depends on the device settings. Its metadata is often stripped when it is sent. Nothing prevents it from being cropped. Faced with a client acting in bad faith, it opens a discussion instead of closing one. We cover this point in our article on the legal value of a photo as evidence.
With Certificall, each photo receives a qualified electronic time stamp and a cross-checked location at the moment it is taken. It is then sealed with a qualified electronic seal under the EU eIDAS regulation. The certificate is a read-only PDF: any change alters its fingerprint and is detected. Our page on Certificall's certification technology details each step. Certificall's proprietary AI also flags a photo of a photo, a risk shared by every photo collection tool.
The Desnoix law firm audited this process in July 2025. Its conclusion: a qualified electronic seal benefits from a presumption of reliability (eIDAS regulation and article 1367 of the French Civil Code). To challenge the photo, the other party must prove a technical failure, which requires in-depth expertise. This is what turns certified construction site photos into an evidence tool in every site manager's pocket.
Stage payments under a CCMI: when a stage is disputed, cash flow waits
In France, many new houses are built under a CCMI (contrat de construction de maison individuelle), a regulated contract between a homeowner and a builder. Article R231-7 of the French Construction and Housing Code caps the share of the price the builder can claim at each stage. The builder can only call a percentage once the stage is reached.
| Stage | Cumulative cap on the price | What the certified photo shows |
|---|---|---|
| Site opening | 15% (deposit included) | Setting out, earthworks, site board |
| Foundations completed | 25% | Foundations poured, utility connections ready |
| Walls completed | 40% | Walls built, ring beams |
| Watertight (hors d'eau) | 60% | Roof structure and roof covering in place |
| Partitions and airtight (hors d'air) | 75% | External joinery and partitions fitted |
| Fittings, plumbing, joinery, heating, external finishes | 95% | Equipment installed, render applied |
Source: article R231-7 of the French Construction and Housing Code (CCH), checked on 25 October 2026. For houses built with prefabricated components, article R231-7-1 sets a different schedule.
Illustrative scenario. A builder calls the 60% payment for the watertight stage. The client has not visited the site for three weeks. He believes the roof is not finished and blocks the payment. His bank waits for his approval before releasing the funds. The site manager certified a series of photos on the day the roof was completed and attached them to the payment request. The client sees the finished roof, with the date and place of the shot. So does his bank.
Construction photo evidence attached to every stage payment turns a disagreement about progress into a check of dated, located facts.
Several trades on site: who scratched the plasterboard?
On a house, trades follow one another in a small space. The plasterer hands over his work package, the tiler arrives the next day, the electrician comes back for finishing. When a board is scratched or a door dented, everyone claims it was already like that. Without proof, the builder pays for the repair.
The fix is a single rule: every subcontractor photographs his work package with Certificall when he leaves. The handover condition is dated: each completed package becomes construction photo evidence. If damage appears, you know between which dates it happened and which trade was working.
CoCreata coordinates several trades on each of its post-disaster repair sites. In 2024, before Certificall, the company paid €50,000 for damaged doors. Since then, every handover is certified.
“Whoever damages it pays the bill.”
Fabien Berthier, co-founder, CoCreata (translated from French)
The company reports fewer arguments and fewer pre-litigation disputes with its contractors. Its full story is told in our article on damage on construction sites (in French).
For the site manager or the after-sales team, there are no more photos to dig out of a group chat. They arrive certified in the site file, sorted by work package.
Handover and snag clearance: the withheld balance
Handover (réception) starts the statutory warranties under French law (article 1792-6 of the Civil Code). Under a CCMI, article R231-7 sets when the balance becomes payable. If snags are recorded, up to 5% of the price is held in escrow until they are cleared.
A client who is not assisted by a building professional at handover gets extra time. Article L231-8 of the Construction and Housing Code gives him eight days after receiving the keys. In that time, he can report by registered letter any visible defects he did not record.
Two series of certified photos cover these moments. The first is taken when the keys are handed over: room by room, façades, surroundings. It records the condition of the house on handover day. The second is taken each time a snag is cleared: before and after the repair. If the client disputes a repair, the builder produces the dated photo of the finished work. Choosing the right tool is covered in our guide to choosing a punch list app.
Under a CCMI, a certified photo of each cleared snag is the proof that releases the balance held in escrow.
Pre-construction condition report: certified photo or judicial officer?
Before breaking ground, many builders have the condition of the road, fences and neighbouring houses recorded. On most sites, a series of certified photos taken on opening day does the job. Sent to the neighbour or the town hall, it records the condition of the surroundings before work starts.
In France, the official route is a report by a commissaire de justice, a sworn judicial officer (formerly huissier). It remains the right answer when the risk is high. That is the case for a party wall, earthworks at the foot of an old house or a neighbour already in dispute.
| Criterion | Certificall certified photo | Judicial officer's report |
|---|---|---|
| Availability | At any time, from the site manager's phone | By appointment |
| Who records the facts | The company itself | An independent public officer |
| Evidential value | Presumption of reliability of the qualified electronic seal (eIDAS) | Authentic until a forgery procedure succeeds |
| To challenge it | Prove a technical failure of the process | Bring a specific forgery claim (inscription de faux) |
| Typical use | Routine site opening, stages, handovers between trades, final handover | Party walls, fragile neighbouring buildings, existing dispute |
Hidden work: the photos the insurer will ask for later
Once the plasterboard is up, nobody sees the insulation, ducts or networks under the slab any more. Yet that is where the discussion with the insurer takes place if a defect appears. The French ten-year builder's liability (garantie décennale) runs for ten years after handover (article 1792 of the Civil Code). Certificall stores certificates for up to 10 years. Shared with the client as work progresses, these photos reassure him: he sees what he will never see again.
Other parties want to know what was done, and when. That is the case for the bank releasing the loan, the building inspector and quality auditors such as Qualibat or NF Habitat. The Trust Score and scoring computed by Certificall on each file help the recipient judge its reliability without travelling.
In practice: how Certificall is set up at a home builder
Four settings are enough to get started.
- Site teams. They take the photo in the Certificall app, just like a normal photo. Construction photo evidence takes a few seconds. Certification happens at the moment of capture.
- Subcontractors. They receive a CertiLink link and have nothing to install. Their photos arrive certified in the site file.
- Files. Photos are sorted by site and by stage. The file is exported as a PDF for a payment request or an expert assessment.
- Builder networks. A shared template (stages, handover, snag clearance) applies to every branch without changing how they work. Certification can also be built into an existing site management software through an API or SDK.
As of 25 October 2026, more than 400 building companies use Certificall, which has issued more than 3 million certifications. Certificall is a partner of the Pôle Habitat FFB Occitanie (French Building Federation) and hosts its data in France, in line with the GDPR.
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The questions we really get asked about construction photo evidence
- ❓ Is a photo taken with Certificall valid as evidence?
- Yes. Each photo carries a qualified time stamp and a qualified electronic seal under the EU eIDAS regulation. The seal benefits from a presumption of reliability (article 1367 of the French Civil Code). To challenge it, the other party must prove a technical failure of the process. Like any evidence, the judge weighs it with the rest of the file.
- ❓ What is the difference between a Certificall photo and a WhatsApp photo?
- A WhatsApp photo proves neither its date nor its location, and its metadata is often lost when it is sent. A Certificall photo is dated by a qualified time stamp, located and sealed at the moment it is taken. Any later change is detected.
- ❓ Does Certificall replace a judicial officer's report?
- No. Certificall covers the stages where nobody calls in a judicial officer: progress, handovers between trades, final handover and snag clearance. A judicial officer's report remains the reference for high-risk or already disputed cases.
- ❓ Do my subcontractors need to install an app?
- No. They receive a CertiLink link and take the photo from their phone. Their photos arrive certified in the builder's site file.
- ❓ Can Certificall be integrated into our site management software?
- Yes. Certificall integrates into existing software through an API or SDK. Photos are certified inside the tool your teams already use.
- ❓ How long are certified photos stored?
- Certificall stores certificates for at least 5 years, and up to 10 years to cover the French ten-year builder's liability. They are hosted in France, in line with the GDPR.
- ❓ Do we need to photograph every stage of the build?
- No, only the moments someone could dispute: payment stages, handovers between trades, hidden work, final handover and snag clearance. Taking the photo is as fast as a normal photo, and it saves rebuilding a file the day a client complains.
