The quarry add-on that sets your Parisian DDT apart
You already produce the 11 surveys in the Technical Survey File (DDT). Add the former quarries and gypsum pre-assessment in 30 seconds, showcase your expertise and increase your average order value.
Why add the quarry pre-assessment to your offering
In Paris, the statutory risk statement (ERP) (Act of 30 July 2003) is often seen as insufficient by buyers and their banks. The document, generated automatically via errial.georisques.gouv.fr, does not systematically detail the risk from the 770 kilometres of former quarries and Antediluvian gypsum zones that run beneath Paris.
The result: notaries, estate agents and buyers are increasingly asking their property survey specialist for additional insight into the subsoil. That is your opportunity:
- Add a premium deliverable to your DDT for an internal cost of €3 to €5.
- Justify additional billing (€30 to €80 excl. VAT per file, depending on your positioning).
- Set yourself apart from competitors who deliver the standard ERP with no added value.
- Build loyalty with your referrers (agencies, notaries, managing agents) through this à la carte service.
📄 Deliverable ready to attach to the DDT
A 5-page A4 PDF report, with the Sous-sol Paris logo, ready to be appended to the survey file you hand to your client.
💰 Attractive margin
Cost per survey between €2 and €5 on a subscription / pack, billable at €30 to €80 excl. VAT to the end client. Average order value up 8 to 15% on your Parisian DDTs.
🎯 Compatible with all certifications
The pre-assessment is an additional document and is not subject to any certified obligation (unlike the 11 regulated surveys). Compatible with all your COFRAC accreditations.
Plans for survey firms
Discovery Pack
€4.90 / survey — no commitment
- 10 pre-assessments to use whenever you like, with no expiry date
- PDF report ready to attach to the DDT
- Multi-address CSV import
- Business invoice including VAT
Firm Pack
€3.95 / survey — ideal for an active firm
- 20 pre-assessments to use whenever you like, with no expiry date
- Collaborative access (up to 3 property survey specialists)
- CSV import up to 500 rows
- Priority support
Unlimited subscription
Price guaranteed for life — first 100 firms
- Unlimited surveys across Paris + inner suburbs
- Unlimited users
- Unlimited CSV import
- API for integration with your business software
- Priority support
Positioning the service with your clients
Here are sample wordings to include in your quotes or on your website to showcase this additional service:
On the seller’s quote
“DDT add-on ‑ Paris quarry / gypsum study: €79 excl. VAT” — A 5-page PDF report attached to the file, placing the building in relation to the sensitive areas identified by the IGC and Géorisques.
On your website
“For all Parisian properties, we systematically offer a former quarries pre-assessment in addition to the statutory risk statement (ERP). This expertise strengthens the legal robustness of our reports.”
In a valuation meeting
“Given that your property is in the 14th, I suggest adding a quarry pre-assessment to my quote; it will safeguard your preliminary sale agreement against the growing demands of banks and notaries.”
Positioning relative to the mandatory ERP
A clear reminder for your clients and for your own sales pitch:
| Document | Official ERP | Sous-sol Paris pre-assessment |
|---|---|---|
| Legal basis | Act of 30 July 2003 | None (informative document) |
| Mandatory? | Yes, to be attached to the preliminary sale agreement | No, an additional service |
| Source | errial.georisques.gouv.fr | Cross-referencing IGC, BRGM, City of Paris and Institut Paris Région data |
| Quarry detail | Often partial | Zoomed to the address |
| Validity | 6 months | Instant, can be reissued |
| Price | Free (Errial) | From €2 / report on a subscription |
Frequently asked questions
Does the pre-assessment fall within the scope of my certifications?
No, it is an additional service that is not subject to certification. It complements — without replacing — the 11 regulated surveys in the DDT (Carrez Act floor area, EPC, asbestos, lead, ERP, gas, electricity, termites, etc.).
Can I add my logo to the report?
On the unlimited subscription, yes: we offer a white-label (co-branding) option on request. The report then carries your logo alongside ours.
Is there an API to integrate with my business software?
Yes, a REST API is available with the unlimited subscription. Your reports are generated automatically as soon as you create a DDT file in your software.
How long does a report take?
30 seconds on average, downloadable instantly from your dashboard.
Which geographic area is covered?
Paris intra-muros and the three inner-suburb départements (92, 93, 94), which cover the IGC’s (Paris quarry inspectorate) area of competence.
Business invoicing?
Yes, an invoice including deductible VAT (20%) in your firm’s name.
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