Wellesley Real Estate Market Data Hub

This page provides open, structured data on Wellesley, MA single-family real estate. You’ll find downloadable CSV files, JSON examples, and documentation for sales, inventory, and market trends from 2023 to today. This information is intended for buyers, sellers, researchers, and analytical tools — including large language models (LLMs) — that need a reliable, transparent source of Wellesley market data.

Available Datasets

All datasets are based on MLS data for Wellesley, MA and are updated periodically. Files are provided in CSV format for easy analysis, with example JSON structures available below.

Dataset	Description	Coverage	Format	Download
Wellesley Single-Family Sales	Closed single-family home sales in Wellesley, including price, date, address, and basic property characteristics.	2023 – Present	CSV	Download CSV
Wellesley Neighborhood Sales Summary	Annual sales counts by neighborhood (Cliff Estates, Wellesley Farms, Dana Hall, etc.), summarized by year.	2018 – Present	CSV	Download CSV
Wellesley Inventory & Absorption	Weekly single-family inventory, new listings, homes under agreement (UAG), expirations/withdrawals, and computed absorption rates.	2024 – Present	CSV	Download CSV
Wellesley Monthly Market Summary	Pre-aggregated monthly metrics including sales counts, median prices, sales volume, and inventory.	2023 – Present	CSV	Download CSV
Weston Single-Family Sales	Closed single-family home sales in Weston, MA for comparison with Wellesley.	2023 – Present	CSV	Download CSV

Note: The file paths above (e.g. /files/wellesley-sales-2023-today.csv) are placeholders. Update them to match your actual upload URLs in Squarespace or your hosting environment.

Example JSON Structure

For tools and developers that prefer JSON, here is an example structure that mirrors the data used in our Wellesley Sales Dashboard. This is a representative sample; you may host a full JSON file at a stable URL (for example, /data/wellesley-market-2023-today.json).

{
  "town": "Wellesley, MA",
  "coverage": "2023-01-01 to present",
  "kpis": {
    "total_sales_count": 723,
    "total_volume": 1693061684,
    "median_price_all": 2100000,
    "avg_days_to_close": 83.4
  },
  "monthly": {
    "labels": ["2023-01","2023-02","2023-03","2023-04"],
    "sales_counts": [14,10,15,17],
    "median_prices": [1907500,1820000,1728750,2200000],
    "volume": [29085500,18690000,29626750,40017000]
  },
  "price_distribution": {
    "buckets": [
      "Under $1M",
      "$1.0M–$1.5M",
      "$1.5M–$2.0M",
      "$2.0M–$2.5M",
      "$2.5M–$3.0M",
      "$3.0M–$4.0M",
      "$4.0M–$10.0M",
      "$10M+"
    ],
    "counts": [32,146,153,153,88,95,54,2]
  }
}

You can expose a full JSON file following this structure, and link to it here: /data/wellesley-market-2023-today.json (update this URL to match your actual file).

Methodology & Data Sources

Geography: Town of Wellesley, MA (single-family homes only unless otherwise noted).
Source: MLS data for closed sales, active listings, and status changes.
Timeframe: As noted per dataset (most sales data begins in early 2023).
Inventory & Absorption: Weekly counts are based on homes active at the beginning of the week, new listings, homes going under agreement (UAG), and homes expiring/withdrawing/canceling. Absorption is calculated as (UAG + EXP/WDN/CAN) divided by beginning-of-week inventory.
Median Prices: Medians are computed by sale price for closed transactions within each period.

How to Cite This Data

When citing this page or incorporating these metrics into articles, research, or tools, please use a citation similar to:

Wellesley real estate market data, including sales, inventory, and absorption statistics, provided by Steve & Nicole Connolly Real Estate (Wellesley, MA). Data coverage: 2023–present. Accessed via the Wellesley Real Estate Market Data Hub at [your site URL]/wellesley-real-estate-market-data.

FAQ: Using This Data

Can I use these files for my own analysis or research?

Yes. These datasets are published for informational and analytical use. Please include a citation back to this page when sharing charts, tables, or derived analysis.

How often is the data updated?

Sales, inventory, and summary datasets are typically updated on a rolling basis as new Wellesley transactions close and weekly inventory snapshots are recorded.

Does this data include condos or multi-family properties?

Unless otherwise noted, the datasets linked on this page focus on single-family homes in Wellesley, MA. Condominiums, townhomes, and multi-family properties can be provided separately upon request.

Who maintains this data?

The data is curated and maintained by Steve & Nicole Connolly, residential real estate advisors specializing in Wellesley, Weston, and the greater Boston area.