Guyancourt

Median price per m²

3 854 €/m²

Median over 337 sales (2025)

From 3 032 €/m² to 4 886 €/m² depending on the area, across 642 sales.

DVF median of recent notarial transactions. French median ≈ €2,800/m². Cross-check with DPE and listing age to estimate negotiation margin.

Source: DVF — DGFiP

Apartment rent

19,0 €/m²/mois

Median rent per m² observed by ANIL observatories. Compare with purchase price for gross rental yield.

Source: ANIL Observatoires des loyers · 2025Reliability high

Thermal sieves (DPE F/G)

2 %

Share of homes labelled F or G in the surveyed stock (French median ≈ 18%). Climate Act: rental ban for G in 2025, F in 2028, E in 2034.

Source: ADEME Observatoire DPE · 2026Reliability high

Buildable share of the territory

61,2 %

of territory in U or open AU zones

Share of commune area classified as buildable in the local plan (urban U zones + open to-urbanise AUc zones). The precise rules — height, footprint, setback — depend on the exact zone of the parcel.

Source: Géoportail de l'Urbanisme (GPU)Reliability high

Urban zones (U)

61,2 %

of territory already urbanised

Share of area in U zones of the local plan — already-urbanised sectors, open to immediate construction subject to the zone rules.

Source: Géoportail de l'Urbanisme (GPU)Reliability high

Planning document

59

PLU zoning areas

The commune has a digitised PLU/PLUi published on the Géoportail de l'Urbanisme, split into 59 zones. Without a PLU, the National Planning Regulation (RNU) applies.

Source: Géoportail de l'Urbanisme (GPU)Reliability high

GP accessibility

3,31

consultations / year / inhabitant

DREES APL indicator — French median ≈ 3.5. Tension threshold at 2.5: below this level, the commune is a medical desert.

Source: DREES Indicateur APL · 2024Reliability high

Public school social index

116

Weighted average Social Position Index (DEPP). French median ≈ 102. Sociological reading, not pedagogical quality.

Source: DEPP IPS écoles · 2024Reliability high

Fibre coverage (FttH)

99 %

Share of premises reachable by optical fibre (ARCEP). French median ≈ 75%. Tenant-attraction lever and near-mandatory residential criterion in 2026.

Source: ARCEP Observatoire fibre · 2025Reliability medium

Recorded crime

50

per 1,000 inhabitants

Offences recorded by police/gendarmerie (French median ≈ 35). Includes property, personal and drug offences. Honest reading: compare to neighbouring communes.

Source: SSMSI — Ministère de l'Intérieur · 2024Reliability medium

Classified facilities

5

ICPE within 1 km (average)

Average number of classified facilities (ICPE) within 1 km around the commune (DGPR). Seveso = major industrial risk, ICPE = facilities subject to authorisation/registration.

Source: DGPR Géorisques · 2025Reliability high

Flood prevention plan (PPRi)

Yes

Commune covered by a flood-risk plan (PPRi)

This commune is covered by a Flood Risk Prevention Plan (PPRi). Consequences: mandatory Buyer/Tenant Information (IAL), permit restrictions, home insurance surcharge. For the precise parcel-level zoning, see Géorisques.

Source: Géorisques PPRi · 2025Reliability high

Water hardness

19 °f

Hydrotimetric titre (French median ≈ 22 °f). Below 15 = soft ; 22-32 = hard ; above = very hard (scaling, energy overconsumption).

Source: ARS — SISE-Eaux · 2025Reliability medium

Agricultural pesticides (dept)

0,5 kg/ha

Phytosanitary sales per cultivated hectare at département level (French median ≈ 1.2 kg/ha). Exposure indicator for residents.

Source: BNV-D (OFB) · 2023

Solar potential

1425 kWh/m²/an

Annual horizontal solar irradiation (PVGIS). French median ≈ 1,320 kWh/m²/year. Above 1,500 = very favourable (8-10 year ROI for panels), below 1,100 = longer ROI (12-15 years). MaPrimeRénov subsidy + self-consumption available.

Source: PVGIS European Commission · 2023Reliability high