Methodology & Data Sources

All data originates from sources any member of the public can access without a login:

• Housebuilder websites (primary source). Live development and plot listings on the builders' own public websites — plot numbers, house types, bedroom counts, property types, parking, asking prices, floor areas, publicly advertised incentives, and each plot's public availability status. This is where the great majority of Nexlo's data comes from.
• Public planning portals. Local planning authority references and portal metadata, used to identify the relevant planning authority for a development. Publicly accessible.
• Geocoding (postcodes.io). An open public API used only to convert a postcode into an approximate location and region for map and area filtering.

Rightmove has been removed. Nexlo previously read a small number of listings via Rightmove; that source has been decommissioned entirely. All listing data is now sourced directly from the builders' own public websites.

Every price shown in Nexlo is the builder's publicly listed asking price at the time it was read, taken from the builder's own website. Nexlo does not hold or display actual, completed or agreed sale prices. Where Nexlo shows the value of a home that is no longer listed, that value is the last public asking price before it was withdrawn — never a sale price.

Floor areas are taken from the builder's own published listing for the home (for example, the floor area stated on the house-type or plot page). They are the same figures any member of the public can read on the builder's website. Nexlo does not calculate or derive floor areas from planning documents.

Nexlo never has access to any builder's sales or reservation data. Instead, it observes changes to what a builder publishes on its own public website and records when a home is no longer listed for sale. A plot is recorded as “no longer listed” when either of the following is observed:

• the plot ceases to appear in the builder's public listing across two consecutive data-collection cycles (a single miss is ignored to avoid false positives); or
• the plot's status changes on the builder's own public listing(for example, from available to reserved).

Important: a home that is no longer listed may have been sold, reserved, or withdrawn for other reasons (for example, a pricing review or a temporary delisting). Nexlo holds no transaction data and does not know, or claim to know, whether or at what price any home was sold. “Listing withdrawal” figures describe changes in public listings only.

Nexlo does not access, store, or display any of the following:

• Completed or actual sale prices — Nexlo holds asking prices only.
• Land Registry transaction data — not accessed or integrated.
• Any builder-supplied or intermediary data — no builder, agent, consultant, or other third party supplies data to Nexlo; nothing is shared with Nexlo privately.
• Confidential builder information — no cost, margin, internal-system, or unreleased/future-phase data.
• Buyer or personal information — Nexlo holds no data about home buyers.

Every field Nexlo stores is recorded with its source URL and the timestamp it was first and last seen, distinguishing values read verbatim from a public source from values Nexlo derives (such as listing-withdrawal counts). A full data-provenance report — showing, per development and per field, the source and last-refresh time — is available to customers and is designed to be reviewable by a builder's compliance or legal team.