Permit Record

Addition Residential

4450 Alton Pl NW, Washington, DC 20016

ClassificationAddition
Reliable valueNot in source
ContractorNot in source
Permit record
Parties
Contractor
Not in source
Applicant
Colin Clark
Owner
Cohen, Alexander S
Architect
Not in source
Engineer
Not in source
Contractor license
Not in source
Building & lot · PLUTO
Building class
Not in source
Zoning district
Not in source
Lot area
Not in source
Year built
Not in source
Units (total)
Not in source
Units (residential)
Not in source
Units (commercial)
Not in source
Floor area
Not in source
Parcel & enrichment
Parcel APN
1591-0018
Climate zone (IECC)
4A
Roof area (est.)
Not derivable — no building-size signal for this permit
HVAC tonnage (est.)
Not derivable — no building-size signal for this permit
Building type
Not in source
Building subtype
ADDITION ALTERATION REPAIR
Geocode & dates
Coordinates
38.9469, -77.0882
Geocode confidence
95%
Geocode source
Not in source
Issued
May 12, 2025
Applied
Not in source
Work class
Residential
Description
Source description

A new two story addition with basement, porch enclosure and alterations and repair to include mechanical and electrical work.

Status
Current status
issued
Source status
PERMIT ISSUED
Provenance
First seen (no changes since)
May 19, 2026 · 00:17 UTC
Data-quality checks0 of 12 flagged

0 of 12 data-quality rules flagged anything on this permit.

Checks not flagged

  • Geocode out of bounds
  • Geocode is sentinel
  • Issued date in the future
  • Issued date parse bug
  • Issued date is placeholder
  • Commercial units is placeholder
  • Residential units out of bounds
  • Residential units is placeholder
  • Total units out of bounds
  • Total units is placeholder
  • Valuation out of bounds
  • Valuation is placeholder
Project timeline at this parcel

8 permits at this parcel (parcel 1591-0018) · Feb 22, 2013 – Jun 25, 2026

  1. Jun 25, 2026E2610283MEP Electrical · Issued
  2. Jun 25, 2026M2603627MEP Mechanical HVAC · Issued
  3. May 4, 2026B2600912Alteration Commercial · Issued
  4. May 12, 2025This permitAddition Residential · Issued
  5. Aug 4, 2021F2100922Fence Wall · Expired
  6. May 3, 2016PC63771646Other · Issued
  7. May 3, 2016PC35374217Other · Issued
  8. Feb 22, 2013B1304039Alteration Commercial · Issued

Full permit history at this parcel · as of Aug 6, 2026.

Developer details
Permit #
B2502410
Canonical ID
243:B2502410
Source permit ID
B2502410
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