Hayes Mill House
Also known as: Site #49-4
Approximate location: the National Park Service places this pin arbitrarily within the property, not at a surveyed point (stated accuracy ±12 m).
Why it's listed
Built around 1780 as a tenant house for a nearby whetstone quarry, this two-story stone house in Newlin Township, Chester County, Pennsylvania, follows the English hall and parlor plan typical of vernacular Colonial building. Its stone core remains easily visible beneath later additions, including a two-story east wing and an enclosed front porch. The house is distinguished by a corbeled stone cornice, seldom seen in this part of Chester County, and by chimneys formed from the stone gable walls. Two other buildings in the West Branch Brandywine Scenic River Corridor have similar cornices. The house is also tied to the Hayes Whetstone Mill and Quarry, opened by Mordecai Hayes about 1780. Under his nephew-line successor Jacob Hayes, the operation used a water-powered mill to dress stones. Whetstones were sold in Philadelphia, Wilmington, and West Chester. Production ended in the 1870s or 1880s. The house is one of the few surviving remnants of this milling industry.
Significance in brief: The nomination argues the house is significant for its vernacular Colonial architecture, particularly its corbeled stone cornice, which is rare in the region. It is also significant for its association with the Hayes Whetstone Mill and Quarry, a local industry that operated for nearly a century.
Machine-generated summary. This summary was generated by a language model from the official nomination document and has not been reviewed line by line by an editor. It may contain errors. Check the source document before relying on any detail. Source: nomination document (PDF) · National Archives catalog entry. NRHP reference 85002358, listed September 16, 1985. Summary generated October 2026 (model claude-haiku-5-5, prompt v1.1-2026-10-29, confidence medium).
Key facts
| Address | Star Gazer Rd., Newlin Twp. |
|---|---|
| County | Chester County |
| Listed | September 16, 1985 |
| Reference number | 85002358 |
| Resource type | District |
| Architect / builder | Mordecai Hayes (builder, per the nomination's account of the tenant house) |
| Architectural style | Colonial English (vernacular, English hall/parlor plan) |
| Areas of significance | Industry, Architecture |
| Level of significance | Local |
| Status (as stated in the nomination) | Good condition with various additions; the form notes the current owners refuse an inside inspection. |
| Acreage | 0.8 |
| Coordinates | 39.93970, -75.73318 (NPS GIS) |
What listing means for this property
This is a historic district. Buildings within its boundary are either contributing (they add to the district's significance) or non-contributing. Owners of contributing income-producing buildings can claim the 20% federal rehabilitation tax credit; homeowners should look at state credits. National Register districts impose no design review by themselves; a local historic district ordinance, if one exists, does (the difference explained).
General information, not legal or tax advice. Rules change; confirm with your State Historic Preservation Office or a qualified adviser.
Sources and further reading
- National Park Service, National Register of Historic Places database (snapshot May 2026), reference 85002358.
- Nomination form (PDF, National Archives) — catalog entry
- Wikipedia article (used for cross-checking only; text not reproduced here)
- Wikidata Q5686618
- This listing as JSON
Last updated October 2026. Found an error? See the editorial policy for how to report it.