Name: Median Price Per Square Foot — ZIP 01821 All Residential, March 31, 2026
Creator: Range Ranger
Published: 2026-03-31
License: https://redfin.com/news/data-center

Question 1

What was the median price per square foot in Billerica (01821)?

Accepted Answer

The median sale price per square foot for All Residential homes in ZIP 01821 was $398/sqft for the 90-day period ending 2026-03-31, based on Redfin closed sale data.

Question 2

What does the median price per square foot in 01821 mean for sellers?

Accepted Answer

The median sale price per square foot reflects what buyers paid per square foot across closed All Residential transactions in ZIP 01821 for the 90-day period ending 2026-03-31. At $398/sqft, this is the midpoint of all closed sales on a per-square-foot basis. Half of homes sold at a higher per-square-foot price; half sold at a lower one.

Question 3

How is the median price per square foot in 01821 calculated?

Accepted Answer

The median price per square foot for ZIP 01821 is derived from closed All Residential sale transactions recorded over the 90-day period ending 2026-03-31. For each transaction, the sale price is divided by the home’s square footage. The median of those per-square-foot values is the reported figure. It is the midpoint — not an average — across all qualifying transactions. Data source: Redfin.

Question 4

Is the price per square foot in 01821 higher or lower than last year?

Accepted Answer

The median sale price per square foot for All Residential homes in ZIP 01821 is up 8.4% compared to the same 90-day period one year ago, as of March 31, 2026.

Question 5

How does the price per square foot in 01821 compare to what sellers are asking?

Accepted Answer

In ZIP 01821, the median sale price per square foot was $398/sqft and the median list price was $649,950 for the 90-day period ending 2026-03-31. The sale PPSF reflects what buyers actually paid on a per-square-foot basis in closed transactions — not what sellers asked.

Question 6

How many homes does the price per square foot figure in 01821 represent?

Accepted Answer

The median price per square foot of $398/sqft for ZIP 01821 is derived from 38 closed All Residential transactions in the 90-day period ending 2026-03-31. Each transaction contributes one sale-price-to-square-footage observation. Data source: Redfin.

Median price per square foot in 01821: $398/sqft, up 8.4% from last year.