.

finder/transform.py

@@ -149,7 +149,7 @@ def map_property_type(sub_type: str | None) -> str:
         return "Terraced"
     if "house" in lower or "cottage" in lower:
         return "Detached"
-    log.warning("Unknown propertySubType: %r — mapping to Other", sub_type)
+    log.warning("Unknown propertySubType: %r, mapping to Other", sub_type)
     return "Other"
 
 
@@ -267,7 +267,7 @@ def build_register_address(
     property's own number or name (e.g. Zoopla detail pages expose
     ``propertyNumberOrName`` = "12" or "Martham Mill"), prepend it so the address
     carries the house identifier that the EPC/Price-Paid register addresses also
-    use — turning a fuzzy street match into a near-exact one. Falls back to the
+    use, turning a fuzzy street match into a near-exact one. Falls back to the
     plain cleaned address when no number/name is available.
     """
     cleaned = clean_listing_address(raw_address)
@@ -282,6 +282,23 @@ def build_register_address(
     return f"{number_or_name}, {cleaned}" if cleaned else number_or_name
 
 
+def build_listing_url(property_url: str | None, is_new_build: bool) -> str:
+    """Build the canonical Rightmove listing URL with an explicit channel marker.
+
+    The search API always echoes ``?channel=RES_BUY`` in ``propertyUrl`` even for
+    new-build developments (the request channel stays BUY), so the channel is
+    re-stamped here from the per-listing ``development`` flag: ``RES_NEW`` for new
+    builds, ``RES_BUY`` for ordinary resale. The map UI reads this marker to split
+    new vs non-new listings. Any channel/fragment already on ``propertyUrl`` is
+    stripped first so the result is deterministic.
+    """
+    if not property_url:
+        return ""
+    base = property_url.split("#", 1)[0].split("?", 1)[0]
+    channel = "RES_NEW" if is_new_build else "RES_BUY"
+    return f"{RIGHTMOVE_BASE}{base}#/?channel={channel}"
+
+
 def transform_property(
     prop: dict,
     outcode: str,
@@ -337,7 +354,7 @@ def transform_property(
 
     inferred_postcode = pc_index.nearest(lat, lng)
     if not inferred_postcode:
-        log.debug("No England postcode for property at %.4f, %.4f — skipping", lat, lng)
+        log.debug("No England postcode for property at %.4f, %.4f; skipping", lat, lng)
         return None
     raw_address = prop.get("displayAddress", "") or ""
     extracted_postcode = extract_full_postcode(raw_address)
@@ -391,7 +408,7 @@ def transform_property(
         "price_frequency": "",
         "Price qualifier": price_qualifier,
         "Total floor area (sqm)": parse_display_size(prop.get("displaySize")),
-        "Listing URL": RIGHTMOVE_BASE + property_url if property_url else "",
+        "Listing URL": build_listing_url(property_url, bool(prop.get("development"))),
         "Listing features": key_features,
         "first_visible_date": prop.get("firstVisibleDate", ""),
     }