Mechanical System Upgrades at 9 Prospect Park West, Brooklyn
9 PROSPECT PARK WEST, BROOKLYN, 11215 · Park Slope
What was permitted
A permit has been issued for mechanical modifications within Apartment 5C at the address 9 Prospect Park West, located in the desirable Park Slope neighborhood of Brooklyn. This work pertains to the building's internal systems.
The permit was issued on May 13, 2026, with an estimated project cost of $25,000. BLUE WATER BUILDERS LLC (GC) is the contractor undertaking these mechanical upgrades.
Homeowners in Park Slope looking at apartment renovations should be aware that mechanical system modifications, like the one at 9 Prospect Park West, can range up to an estimated $25,000.
What it cost
Issued
May 13, 2026
Expires
February 23, 2027
License
General Contractor
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Filed by BLUE WATER BUILDERS LLC · 5 permits across 4 neighborhoods
View the official permit record
Tracking number, work description, cost, and dates
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View the official permit record
Tracking number, work description, cost, and dates
| Tracking Number | 447695909 |
| Work Permit # | B01321858-S1-MS |
| Job Filing Number | — |
| Work Type | Mechanical Systems |
| Status | Permit Issued |
| Job Description | MECHANICAL MODIFICATIONS TO APT 5C |
| Floor / Unit | Floor Number(s) 5 through 5 |
| Estimated Cost | $25,000 |
| Approved | March 27, 2026 |
| Issued | May 13, 2026 |
| Expires | February 23, 2027 |
| BBL | — |
| BIN | — |
Property Owner
Not Applicable
Matthew Keller