2026 assessment
$1.4M
OPA value, not a listing price
House report
421 W Mermaid Ln
Research this property with Analyst →4 bd3 ba2 stories3,510 sqftRSD1built 1912
Property at a glanceHouse
Owner-occupancy signal
ZIP 19118 area
Chestnut Hill
400 block of W Mermaid Ln
Assessment and City record timeline
Published City assessments for this house against its block and ZIP. Dated City filings are marked on the same line. Select one to read it. Assessments are tax-roll values, not sale prices or appraisals.
- OPA assessment · 2016$808K assessed valueOPA’s value on the City tax roll for that year. It is not an appraisal, listing price, sale price, or live tax balance.How Philadelphia property assessments work ↗
- OPA assessment · 2017$808K assessed valueOPA’s value on the City tax roll for that year. It is not an appraisal, listing price, sale price, or live tax balance.How Philadelphia property assessments work ↗
- OPA assessment · 2018$808K assessed valueOPA’s value on the City tax roll for that year. It is not an appraisal, listing price, sale price, or live tax balance.How Philadelphia property assessments work ↗
- OPA assessment · 2019$971K assessed valueOPA’s value on the City tax roll for that year. It is not an appraisal, listing price, sale price, or live tax balance.How Philadelphia property assessments work ↗
- OPA assessment · 2020$930K assessed valueOPA’s value on the City tax roll for that year. It is not an appraisal, listing price, sale price, or live tax balance.How Philadelphia property assessments work ↗
- OPA assessment · 2021$930K assessed valueOPA’s value on the City tax roll for that year. It is not an appraisal, listing price, sale price, or live tax balance.How Philadelphia property assessments work ↗
- OPA assessment · 2022$930K assessed valueOPA’s value on the City tax roll for that year. It is not an appraisal, listing price, sale price, or live tax balance.How Philadelphia property assessments work ↗
- OPA assessment · 2023$1.3M assessed valueOPA’s value on the City tax roll for that year. It is not an appraisal, listing price, sale price, or live tax balance.How Philadelphia property assessments work ↗
- OPA assessment · 2024$1.3M assessed valueOPA’s value on the City tax roll for that year. It is not an appraisal, listing price, sale price, or live tax balance.How Philadelphia property assessments work ↗
- OPA assessment · 2025$1.4M assessed valueOPA’s value on the City tax roll for that year. It is not an appraisal, listing price, sale price, or live tax balance.How Philadelphia property assessments work ↗
- OPA assessment · 2026$1.4M assessed valueOPA’s value on the City tax roll for that year. It is not an appraisal, listing price, sale price, or live tax balance.How Philadelphia property assessments work ↗
- OPA assessment · 2027$1.4M assessed valueOPA’s value on the City tax roll for that year. It is not an appraisal, listing price, sale price, or live tax balance.How Philadelphia property assessments work ↗
- Permit · 2018-12-17PlumbingThis permit category usually covers water, drainage, fixtures, or other plumbing work. The approved scope—not the short category—defines what was authorized, and issuance alone does not prove completion.Philadelphia construction and repair permits ↗
- Permit · 2019-01-14ZoningThis permit category usually covers the property’s allowed use, dimensions, occupancy, or site configuration. The approved scope—not the short category—defines what was authorized, and issuance alone does not prove completion.Philadelphia construction and repair permits ↗
- Permit · 2019-02-01ZoningThis permit category usually covers the property’s allowed use, dimensions, occupancy, or site configuration. The approved scope—not the short category—defines what was authorized, and issuance alone does not prove completion.Philadelphia construction and repair permits ↗
- Permit · 2019-05-30Addition and/or AlterationThis permit category usually covers construction, repair, alteration, addition, or occupancy work. The approved scope—not the short category—defines what was authorized, and issuance alone does not prove completion.Philadelphia construction and repair permits ↗
- Permit · 2019-11-20New ConstructionThis permit category usually covers construction, repair, alteration, addition, or occupancy work. The approved scope—not the short category—defines what was authorized, and issuance alone does not prove completion.Philadelphia construction and repair permits ↗
- Permit · 2020-02-18AlterationsThis permit category usually covers construction, repair, alteration, addition, or occupancy work. The approved scope—not the short category—defines what was authorized, and issuance alone does not prove completion.Philadelphia construction and repair permits ↗
- Permit · 2020-02-18New ConstructionThis permit category usually covers construction, repair, alteration, addition, or occupancy work. The approved scope—not the short category—defines what was authorized, and issuance alone does not prove completion.Philadelphia construction and repair permits ↗
- Appeal · 2018-12-12Zoning board appealA challenge or request reviewed through a City appeals process. Filing an appeal does not show who prevailed; read the decision, conditions, and related permit or violation.How Philadelphia L&I appeals work ↗
Property assessmentBlock median & rangeZIP 19118 (Chestnut Hill) medianAssessmentAppealPermit
Scroll horizontally to move through the years. Each icon sits on its recorded date; records without a day are labeled and centered within their year. Select one to explain the filing.
Highlight
Every dated record8 events · exact dates, newest first
- PermitAlterations
- PermitNew Construction
- PermitNew Construction
- PermitAddition and/or Alteration
- PermitZoning
- PermitZoning
- PermitPlumbing
- AppealZoning board appeal
Flags: 1 zoning/board appeal on record. Informational only. Not investment advice or a consumer report (FCRA).
Verify the public record
Property tax
$17,754/year estimated property tax
2026 taxable assessment $1,268,300 × 1.3998%. This is an estimate, not a bill or account balance. The City maintains payments, credits, interest, and the current amount due.
OPA has published a 2027 assessment of $1,436,100. It is not the 2026 billed-year value.
Payments, credits, interest, and the current amount due are maintained by the City.
OPA 0921430502026 OPA removes $100,000 from the taxable assessment through the owner-occupant exemption.
Historical delinquency sources No current conclusion
This parcel did not match the June 2022 delinquency snapshot. That absence does not confirm the account is current today.
For a purchase, refinance, or closing, request the City’s official Property Payoff statement in Tax Center under “More options.”
The property, on paper
OPA physical field record.
Bedrooms
4
Bathrooms
3
Stories
2
Interior
3,510 sqft
livable area
Lot
33,750 sqft
Basement
Partial
city code H
Heat
Hot water / radiators
city code B
Central air
Yes
Garage
2 spaces
Exterior condition
Average
city code 4
Above averageBelow average
Interior condition
Average
city code 4
Above averageBelow average
Quality grade
A
assessor's grade
ABCDE
Zoning
RSD1
city zoning code
Zoning appeals
1
OPEN · Granted with conditions · 2018
OPA field-assessment attributes. Condition and grade are the assessor's codes, not an inspection.
Block context
400 block of W Mermaid Ln. Compare parcels, ownership, and public-record history.
See the whole block →Next door: 425 W Mermaid Ln · 415 W Mermaid Ln
L&I licenses checked through Jul 28, 2026
No business or residential license records
No business license or residential registration matched this OPA parcel in the latest City data.
Open every source row 8 dated rows
- PermitAlterations
Permit 1050482 · Completed
DRAIN & WATER LINES TO FIXTURES 3-TOILETS, 4-LAVS, 2-SHOWERS, 1-KITCHEN SINK THE INSTALLATION WILL COMPLY WITH THE PHILADELPHIA PLUMBING CODE 2004
- PermitNew Construction
Permit 1050496 · Completed
EZ PERMIT DUCTWORK & WARM-AIR APPLIANCES- For the installation if New Ductwork, Registers/Grilles/Diffusers, and Warm-Air Appliances as per attached standards. Deviations from these standards require submission of construction and site plans.
- PermitNew Construction
Permit 1028866 · Completed
ON AN EXISTING 200AMP SERVICE,INSTALL NEW 200AMP PANEL AND PARTIAL REWIRE OF A SFD WITH RECEPTS,SWITCHES,LIGHTS,FIXTURES,SMOKES AND CO DETECTORS AS PER 2014 NEC (NORTH DISTRICT)
- PermitAddition and/or Alteration
Permit 938246 · Completed
CONSTRUCTION OF A DORMER ABOVE NORTH ELEVATION ENTRY DOOR AND CONSTRUCTION OF A ONE (1) STORY TRELIS ON AN EXISTING SINGLE FAMILY DETACHED STRUCTURE. INTERIOR RENOVATIONS, SIZE AND LOCATION AS SHOWN ON PLANS. SEPERATE PERMITS REQUIRED FOR MEP
- PermitZoning
Permit 900593 · COMPLETED
FOR THE ERECTION OF A 4' HIGH FENCE IN FRONT OF AN EXISTING DETACHED STRUCTURE (IN TWO SEGMENTS - IN FRONT OF THE HOUSE 100% OPAQUE AND THE REMAINDER - 50% OPAQUE). SIZE AND LOCATIONS AS SHOWN IN APPLICATION / PLAN. ACCESSORY TO AN EXISTING DETACHED SINGLE FAMILY DWELLING (HOUSEHOLD LIVING).
- PermitZoning
Permit 938241 · COMPLETED
CONSTRUCTION OF A DORMER ABOVE NORTH ELEVATION ENTRY DOOR AND CONSTRUCTION OF A ONE (1) STORY TRELIS ON AN EXISTING SINGLE FAMILY DETACHED STRUCTURE. SIZE AND LOCATION AS SHOWN ON PLANS
- PermitPlumbing
Permit 935447 · COMPLETED
REPAIR WATER DISTRIBUTION PIPE BETWEEN METER AND WATER MAIN PER 2004 PHILADELPHIA PLUMBING CODE
- AppealZoning board appeal
Appeal 35071 · OPEN · Granted with conditions
Related permit 900593 · PERMIT FOR ERECTION OF A 6’ HIGH FENCE IN FRONT OF AN EXISTING DETACHED STRUCTURE. SIZE AND LOCATIONS AS SHOWN IN APPLICATION / PLAN. ACCESSORY TO AN EXISTING DETACHED SINGLE FAMILY DWELLING (HOUSEHOLD LIVING).
Where this comes from
- Assessment, spec sheet & owner: OPA Property Assessments, Office of Property Assessment
- Sales & deed history: Realty Transfer Tax records, Recorder of Deeds
- Permits, violations & inspections: L&I Property History · Atlas
- Tax delinquency snapshot · June 2022: Real Estate Tax Delinquencies, Dept. of Revenue
- Historical tax ledger & liens · through 2016: Real Estate Tax Balances, Dept. of Revenue
- Current property-tax balance: Verify with Philadelphia Revenue
- Zoning appeals: L&I & Zoning Board appeals
- Neighborhood income & rents: US Census ACS 5-year estimates
- Historical mortgage rates: Freddie Mac Primary Mortgage Market Survey, annual averages
- Imagery: Street photo © Google · Aerial © Esri, Maxar
Methodology & freshness
This report was assembled Jul 28, 2026, 10:14 PM ET. Available City datasets are queried from OpenDataPhilly (phl.carto.com) and the cited City ArcGIS feeds; record queries paginate rather than silently taking a first page. For this property: Permits: queried · Violations: queried · Investigations: queried · Appeals: queried · Licenses: queried · Building certifications: queried. “Unavailable” means the source query failed or was not supplied, not “no record.” Reports re-pull on view after seven days and on an overnight rolling schedule; citywide benchmarks recompute weekly. Source dates still govern: the parcel-level tax-delinquency snapshot is June 2022 and the separate detailed tax ledger ends in 2016, so neither establishes today’s balance. The live balance and date-effective payoff must be verified in Tax Center. AI-written passages are grounded in the assembled record and rejected if they state a number the record does not hold.
Official city record ↗ · L&I history ↗ · See the whole block · Download this record (JSON)