Home addition cost in New York City, NY: what 1,772 permits declare

The median declared cost of home addition on New York City building permits filed 2024–2026 is $100,000. Half of all permits fall between $36,000 and $260,590. The national sourced whole-project range on our home addition cost guide is $21,899–$83,362.

Median declared cost

$100,000

1,772 permits

Middle half

$36,000–$260,590

p25–p75

Full span after trimming

$500–$883,960

$500 floor, top 1% removed

How to read this

These figures are the project values applicants declared to the New York City permitting office, which uses them to calculate permit fees. Declared values tend to sit below the final invoice, and jobs done without a permit are not counted at all. Read the median as a floor for a permitted home addition job in New York City, then check it against the sourced national range and get local quotes.

Where the data comes from

Source: New York City open-data portal, dataset w9ak-ipjd. Filter: residential permits issued 2024-09-09 to 2026-09-09 whose description matchesjob_type='Alteration' AND (upper(job_description) like '%ENLARGEMENT%' OR upper(job_description) like '%EXTENSION%'). Compiled 2026-09-09. Full method on the methodology page; every cell is in the CSV download.