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Soil survey mandatory in France · ELAN law, clay zones

Your mandatory soil survey in France,
comparable quotes in 2 minutes.

Request quotes from geotechnical engineering firms in France near your project.
One single request, 100% free, with no obligation and no account required.

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100% free service Everywhere in France 350+ engineering firms

How it works

Get your geotechnical report in 3 steps

Describe your project

Address, reason (buying land, construction, cracks…), useful documents. Email validation.

We forward to nearby engineering firms

Selection of the geotechnical engineering firms closest to your address.

You receive your quotes

By email, as soon as the engineering firms have priced your project. You compare and choose freely, with no obligation.

When to request a study

For whom, for what?

All standardised missions G1 to G5 (NF P 94-500) are available depending on your needs.

Buying land

In France, a soil survey is mandatory in clay zones since the ELAN law (2020) — G1 minimum, G2 AVP recommended.

House construction

Foundation sizing, anticipating shrink-swell clay risks.

Cracks / damage

G5 study for appraisal after drought- or soil-related damage.

Extension / renovation

G2 PRO or G3 depending on your project context.

Why G2AVP.com

An independent, transparent, free matchmaking service.

We list over 350 geotechnical engineering firms across mainland France. Our role: to help you quickly reach the firms relevant to your address, without blind cold-calling.

  • Engineering firms applying the NF P 94-500 standard with verified professional liability insurance
  • Comparable quotes — you keep control of the final choice
  • Request validated by email, fast forwarding
  • No cold-calling, no newsletter
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Geographic coverage

410 listed engineering firms · serving 96 departments

01 – Ain : 32 bureaux d'études interviennent 02 – Aisne : 27 bureaux d'études interviennent 2A – Corse-du-Sud : 2 bureaux d'études interviennent 2B – Haute-Corse : 4 bureaux d'études interviennent 03 – Allier : 8 bureaux d'études interviennent 04 – Alpes-de-Haute-Provence : 34 bureaux d'études interviennent 05 – Hautes-Alpes : 12 bureaux d'études interviennent 06 – Alpes-Maritimes : 17 bureaux d'études interviennent 07 – Ardèche : 37 bureaux d'études interviennent 08 – Ardennes : 7 bureaux d'études interviennent 09 – Ariège : 17 bureaux d'études interviennent 10 – Aube : 10 bureaux d'études interviennent 11 – Aude : 21 bureaux d'études interviennent 12 – Aveyron : 8 bureaux d'études interviennent 13 – Bouches-du-Rhône : 37 bureaux d'études interviennent 14 – Calvados : 12 bureaux d'études interviennent 15 – Cantal : 11 bureaux d'études interviennent 16 – Charente : 12 bureaux d'études interviennent 17 – Charente-Maritime : 10 bureaux d'études interviennent 18 – Cher : 8 bureaux d'études interviennent 19 – Corrèze : 10 bureaux d'études interviennent 21 – Côte-d'Or : 16 bureaux d'études interviennent 22 – Côtes-d'Armor : 12 bureaux d'études interviennent 23 – Creuse : 8 bureaux d'études interviennent 24 – Dordogne : 19 bureaux d'études interviennent 25 – Doubs : 16 bureaux d'études interviennent 26 – Drôme : 36 bureaux d'études interviennent 27 – Eure : 37 bureaux d'études interviennent 28 – Eure-et-Loir : 42 bureaux d'études interviennent 29 – Finistère : 8 bureaux d'études interviennent 30 – Gard : 31 bureaux d'études interviennent 31 – Haute-Garonne : 18 bureaux d'études interviennent 32 – Gers : 21 bureaux d'études interviennent 33 – Gironde : 16 bureaux d'études interviennent 34 – Hérault : 21 bureaux d'études interviennent 35 – Ille-et-Vilaine : 10 bureaux d'études interviennent 36 – Indre : 7 bureaux d'études interviennent 37 – Indre-et-Loire : 6 bureaux d'études interviennent 38 – Isère : 35 bureaux d'études interviennent 39 – Jura : 21 bureaux d'études interviennent 40 – Landes : 16 bureaux d'études interviennent 41 – Loir-et-Cher : 11 bureaux d'études interviennent 42 – Loire : 31 bureaux d'études interviennent 43 – Haute-Loire : 30 bureaux d'études interviennent 44 – Loire-Atlantique : 17 bureaux d'études interviennent 45 – Loiret : 16 bureaux d'études interviennent 46 – Lot : 12 bureaux d'études interviennent 47 – Lot-et-Garonne : 17 bureaux d'études interviennent 48 – Lozère : 10 bureaux d'études interviennent 49 – Maine-et-Loire : 19 bureaux d'études interviennent 50 – Manche : 14 bureaux d'études interviennent 51 – Marne : 9 bureaux d'études interviennent 52 – Haute-Marne : 15 bureaux d'études interviennent 53 – Mayenne : 15 bureaux d'études interviennent 54 – Meurthe-et-Moselle : 10 bureaux d'études interviennent 55 – Meuse : 12 bureaux d'études interviennent 56 – Morbihan : 13 bureaux d'études interviennent 57 – Moselle : 11 bureaux d'études interviennent 58 – Nièvre : 3 bureaux d'études interviennent 59 – Nord : 10 bureaux d'études interviennent 60 – Oise : 44 bureaux d'études interviennent 61 – Orne : 11 bureaux d'études interviennent 62 – Pas-de-Calais : 10 bureaux d'études interviennent 63 – Puy-de-Dôme : 9 bureaux d'études interviennent 64 – Pyrénées-Atlantiques : 12 bureaux d'études interviennent 65 – Hautes-Pyrénées : 8 bureaux d'études interviennent 66 – Pyrénées-Orientales : 7 bureaux d'études interviennent 67 – Bas-Rhin : 9 bureaux d'études interviennent 68 – Haut-Rhin : 9 bureaux d'études interviennent 69 – Rhône : 27 bureaux d'études interviennent 70 – Haute-Saône : 17 bureaux d'études interviennent 71 – Saône-et-Loire : 28 bureaux d'études interviennent 72 – Sarthe : 8 bureaux d'études interviennent 73 – Savoie : 21 bureaux d'études interviennent 74 – Haute-Savoie : 21 bureaux d'études interviennent 75 – Paris : 39 bureaux d'études interviennent 76 – Seine-Maritime : 14 bureaux d'études interviennent 77 – Seine-et-Marne : 39 bureaux d'études interviennent 78 – Yvelines : 42 bureaux d'études interviennent 79 – Deux-Sèvres : 16 bureaux d'études interviennent 80 – Somme : 13 bureaux d'études interviennent 81 – Tarn : 19 bureaux d'études interviennent 82 – Tarn-et-Garonne : 20 bureaux d'études interviennent 83 – Var : 33 bureaux d'études interviennent 84 – Vaucluse : 37 bureaux d'études interviennent 85 – Vendée : 16 bureaux d'études interviennent 86 – Vienne : 10 bureaux d'études interviennent 87 – Haute-Vienne : 8 bureaux d'études interviennent 88 – Vosges : 15 bureaux d'études interviennent 89 – Yonne : 10 bureaux d'études interviennent 90 – Territoire de Belfort : 11 bureaux d'études interviennent 91 – Essonne : 39 bureaux d'études interviennent 92 – Hauts-de-Seine : 39 bureaux d'études interviennent 93 – Seine-Saint-Denis : 40 bureaux d'études interviennent 94 – Val-de-Marne : 39 bureaux d'études interviennent 95 – Val-d'Oise : 40 bureaux d'études interviennent
Pierre Vallino, founder of G2AVP.com

Who publishes G2AVP.com

Pierre Vallino, geotechnical engineer

Founder ofEnnéade Ingénierie (Nice). Ten years of field experience in geotechnics: deep excavations, special foundations, structure monitoring, hydrogeology.

G2AVP.com was born from a simple observation: finding the right engineering firm for a soil survey is often an ordeal for an individual. An independent platform, designed by an industry engineer, can fill that gap.

Learn more

Free documentation

Geotechnical guides to download

Practical PDF guides to help you: before buying, during works, or after damage.

10 checks before buying land

The complete checklist to run before signing the purchase agreement.

Swelling clays — understand and prevent

Identify the shrink-swell clay risk and choose the right preventive measures.

Shrink-swell clay cracks — natural disaster procedure

Claim on your insurance after drought damage and build the file.

Ground movements — landslides and rockfalls

Recognise the signs and choose the right technical solutions.

Not sure which mission to request?

G2 AVP or G2 PRO? Cost of a G2 AVP study G1, G2, G3, G4, G5: differences Understanding G2 AVP Understanding G2 PRO All guides

Frequently asked questions

FAQ

What is a G2 AVP study?
The G2 AVP geotechnical mission (preliminary design) characterises soil-related risks for a construction project. In France, in medium or high clay-hazard zones, the ELAN law has, since 2020, required a geotechnical study when selling building land: the preliminary G1 is legally sufficient, but the more complete G2 AVP is recommended in practice.
Which geotechnical missions can I request?
All NF P 94-500 standardised missions are covered:
  • G1 — Preliminary geotechnical study (feasibility, general foundation principles)
  • G2 AVP — Preliminary design study (the most common: land sale, house construction)
  • G2 PRO — Detailed design study (precise foundation sizing)
  • G3 — Geotechnical study and construction monitoring
  • G4 — Geotechnical construction supervision
  • G5 — Geotechnical diagnosis (damage, cracks, shrink-swell clay)

When you submit your request, simply choose the type of study that matches your project. If you're unsure, our partner engineering firms will guide you.

Is the service really free?
Yes, completely. You will never be charged anything to use G2AVP.com.
How much does a G2 AVP soil survey cost?
The cost typically ranges from €1,500 to €4,000 excl. VAT depending on context (access, area, soil type, investigation depth). Getting several quotes lets you compare objectively.
Am I required to sign with one of the proposed firms?
No, never. You remain 100% free to choose. You can accept one of the quotes, negotiate, or turn to another provider — no contractual obligation to G2AVP.com.
How are the engineering firms selected?
We select the firms geographically closest to your address, among those with up-to-date professional liability insurance and applying the NF P 94-500 standard. No paid ranking.

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Describe your project in under 2 minutes. We forward your request to the nearest engineering firms in France as soon as it's validated.

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100% free service, no account and no obligation.