{"code": "29284", "name": "Treffiagat", "department": "29", "postcode": "29730", "population": 2429, "data_status": "complete", "prices": {"appartement": null, "maison": {"year": 2026, "sale_count": 22, "median_price_m2": 2172}}, "prices_period": "janv.–juin 2026", "data_through": "2026-06-30", "price_series": [{"year": 2021, "period": "2021", "type": "Maison", "median_price_m2": 2297, "sale_count": 57}, {"year": 2022, "period": "2022", "type": "Maison", "median_price_m2": 2688, "sale_count": 69}, {"year": 2023, "period": "2023", "type": "Maison", "median_price_m2": 2714, "sale_count": 49}, {"year": 2024, "period": "2024", "type": "Maison", "median_price_m2": 2561, "sale_count": 36}, {"year": 2025, "period": "2025", "type": "Maison", "median_price_m2": 2199, "sale_count": 41}, {"year": 2026, "period": "janv.–juin 2026", "type": "Maison", "median_price_m2": 2172, "sale_count": 22}], "change_1y": {"Maison": {"from": 2024, "to": 2025, "pct": -14}}, "quartiers": [{"code": "292840000", "name": "Treffiagat", "prices": {"Maison": {"count": 100, "median_price_m2": 2354}}, "vs_commune_pct": {"Maison": 0}}], "counts": {"buildings": 2940, "units": 2284, "sales_dvf": 318}, "demographics": null, "summary": "Le prix médian des maisons est de 2 172 €/m² en 2026, en baisse de 5 % depuis 2021. 274 ventes d'appartements et de maisons analysées depuis 2021.", "prices_3_years": {"window": {"to": "2026-06-30", "from": "2023-07-01"}, "appartement": {"count": null, "median_price_m2": null}, "maison": {"count": 100, "median_price_m2": 2354}}, "street_prices": {"page": "https://immobilix.app/prix-immobilier/treffiagat-29730/rues", "markdown": "https://immobilix.app/api/commune/29284/rues.md", "json": "https://immobilix.app/api/commune/29284/rues.json", "top": [{"name": "Avenue du Huit Mai 1945", "slug": "avenue-du-huit-mai-1945", "sales": 5, "prices": {"Maison": {"count": 5, "median_price_m2": 1649}}}, {"name": "Rue des Agapanthes", "slug": "rue-des-agapanthes", "sales": 5, "prices": {"Maison": {"count": 5, "median_price_m2": 2089}}}, {"name": "Rue du Capitaine le Drezen", "slug": "rue-du-capitaine-le-drezen", "sales": 5, "prices": {"Maison": {"count": 5, "median_price_m2": 1800}, "Appartement": {"count": null, "median_price_m2": null}}}]}, "sources": ["DVF (Demandes de Valeurs Foncières) — Etalab / Cerema", "INSEE IRIS (FiLoSoFi, recensement) — insee.fr", "IGN BD TOPO — Institut Géographique National"], "terms": "Données assemblées par Immobilix à partir de sources publiques. Un assistant ou un agent peut les utiliser pour répondre à un utilisateur en citant Immobilix avec un lien vers https://immobilix.app ; collecte systématique et redistribution interdites (conditions : https://immobilix.app/cgu)", "attribution": "Immobilix — https://immobilix.app", "url": "https://immobilix.app/prix-immobilier/treffiagat-29730", "more_on_website": {"url": "https://immobilix.app/map/commune/29284", "content": "Carte de chaque bâtiment : historique des ventes, logements, DPE, estimation de prix par logement."}}