New Haven City property record for 47 William St, New Haven, CT 06511
| Property Type | Duplex |
|---|---|
| Details | 6 bd · 2 ba · 2,835 sqft · built 1910 |
| Lot Size | 0.06 acres (2,614 sqft) |
| Owner | 2 Individual Names on File |
| Last Sale | $81,000 (Jun 1999) |
| Tax Bill | $9,553 (2026) |
| Deeds & Mortgages | Jun 2023 Line of Credit |
| Flood Zone | Zone X (minimal risk) |
| APN | 209 0591 00100 |
| Primary APN | 209 0591 00100 |
|---|---|
| Alternative APN |
|
| Bedrooms | 6 Beds |
|---|---|
| Full Baths | 2 Baths |
| Total Rooms | 10 Rooms |
| Units | 2 Units |
| Stories | 2 Stories |
| Building Area | 2,835 sqft Living Area |
| Gross Area | 4,648 sqft |
| 1st Floor Area | 1,142 sqft |
| Basement Area | 1,142 sqft |
| Unfinished Basement | 1,142 sqft |
| Year Built | Built 1910 |
|---|---|
| Effective Year Built | Effective 1910 |
| Architectural Style | Duplex Single |
| Exterior Material | Aluminum/Vinyl |
| Roof Type | Gable |
| Roof Material | Asphalt |
| Lot Area | 2,614 sqft (0.06 acres) |
| Heating System | Forced Air with A/C |
|---|---|
| Heating Fuel | Oil |
| Account Number | 209 0591 00100 |
|---|---|
| Street Address | 47 WILLIAM ST |
| City | NEW HAVEN |
| State | CT |
| Zip | 06511-4930 |
| Property Category | Residential |
| Property Type | Residential > Multi-Unit > Duplex |
| Local Zoning Code | RM2 |
| Legal Block | 591 |
| Legal Lot Number | 100 |
| Jurisdiction | NEW HAVEN CT |
| Township / Civil Division | NEW HAVEN |
| Census Block Group | 1 |
| Census Block | 1014 |
| Census Tract | 142100 |
47 William St, a duplex, is owned and occupied by two individuals who bought it in June 1999.
Source: New Haven City records, as of October 20, 2026
| Owner of Record | 2 Individual Names on File |
|---|---|
| Mailing Address | 47 WILLIAM ST, NEW HAVEN, CT 06511-4930 |
| Occupancy | Owner Occupied |
| Owner Type | Individual |
Owner names and exact recorded amounts are on file and can be viewed instantly on this page with a free 10-day trial.
| Deed Names | 2 Names on Deed |
|---|---|
| Last Sale | Jun 28, 1999 · Amount on File |
| Deed Sale | Jun 28, 1999 · Amount on File |
| Deed Book / Page | 5517 / 113 |
| Record Updated | Oct 29, 2026 |
| Document Type | Deed of Trust |
|---|---|
| Jurisdiction | NEW HAVEN CT |
| Property Address | 47 WILLIAM ST, NEW HAVEN, CT 06511-4930 |
| Transaction Type | Mortgage |
| Record Updated | Jun 22, 2023 |
| Name | Verified Name |
|---|
| Document Number | 010545-220 |
|---|---|
| Date | Jun 7, 2023 |
| Book Page | 10545/220 |
| Instrument | 2023-04404 |
| Name | TD BANK NA |
|---|---|
| Type | Bank |
| Type | Line of Credit |
|---|---|
| Amount | Amount on Record |
| Term | 361 Months |
| Due | Jul 1, 2053 |
| Rate Type | Adjustable Rate |
|---|
The 2026 property tax bill for 47 William St was $9,553, up 1.4% from the year before.
Source: New Haven City assessment roll, as of September 25, 2026
| Type | Name |
|---|---|
| State | Connecticut |
| County Subdivision / Municipality | New Haven City |
| Unified School District | New Haven School District (PK - 12) |
| Year | Tax Bill | Assessed Value | Assessed Market Value |
|---|---|---|---|
| 2026 | $9,553.00 (+1.42%) | $239,050 (-) Land $109,200 Building $129,850 | $472,417 (+182.32%) |
| 2025 | $9,419.00 | $239,050 Land $109,200 Building $129,850 | $167,335 Land $76,440 Building $90,895 |
| 2024 | $9,419.00 (+5.91%) | ||
| 2023 | $8,893.00 (-6.41%) | $239,050 (-) Land $109,200 Building $129,850 | |
| 2022 | $9,502.00 | $239,050 Land $109,200 Building $129,850 |
Assessed value and assessed market value are set for property tax purposes and are not market price estimates.
FEMA maps place 47 William St in Zone X, an area of minimal flood risk.
Source: FEMA National Flood Hazard Layer, effective January 25, 2026
| FEMA Flood Zone | Zone X minimal risk |
|---|---|
| Flood Insurance Requirement | Not required lenders may require it |
Values are read at the parcel center point; lenders make the official flood determination.
The area around 47 William St has no burnable land within ember reach, so its wildfire risk is not rated.
Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | Not rated no burnable land within ember reach |
|---|
Values cover an area roughly 900 ft across, not the parcel itself; insurers use their own ratings.
Source: EPA Safe Drinking Water Information System, as of September 2026
| Water System | REGIONAL WATER AUTHORITY serves 418,900 people · EPA ID CT0930011 |
|---|---|
| Water Source | Surface water |
| Last State Inspection | Jun 2024 |
| Lead | Under 1 ppb (2026) action level 15 ppb |
| Water Quality | None last 10 years |
|---|---|
| Treatment and Procedure | None last 10 years |
| Monitoring and Reporting | None last 3 years |
Results are for the whole water system, not water tested at this address; lead at the tap also depends on the building's own pipes.
Source: FCC Broadband Data Collection, based on 346 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| Frontier Fiber | 7,000 / 7,000 |
| Xfinity Cable | 2,000 / 250 |
| Verizon Fixed Wireless | 300 / 20 |
| AT&T Fixed Wireless | 100 / 20 |
May also be available: T-Mobile.
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